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2299 lines
73 KiB
C
2299 lines
73 KiB
C
/*
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* Virtio PCI Bindings
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*
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* Copyright IBM, Corp. 2007
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* Copyright (c) 2009 CodeSourcery
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Paul Brook <paul@codesourcery.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include "exec/memop.h"
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#include "standard-headers/linux/virtio_pci.h"
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#include "hw/boards.h"
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#include "hw/virtio/virtio.h"
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#include "migration/qemu-file-types.h"
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#include "hw/pci/pci.h"
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#include "hw/pci/pci_bus.h"
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#include "hw/qdev-properties.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/log.h"
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#include "qemu/module.h"
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#include "hw/pci/msi.h"
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#include "hw/pci/msix.h"
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#include "hw/loader.h"
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#include "sysemu/kvm.h"
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#include "hw/virtio/virtio-pci.h"
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#include "qemu/range.h"
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#include "hw/virtio/virtio-bus.h"
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#include "qapi/visitor.h"
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#include "sysemu/replay.h"
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#include "trace.h"
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#define VIRTIO_PCI_REGION_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_present(dev))
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#undef VIRTIO_PCI_CONFIG
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/* The remaining space is defined by each driver as the per-driver
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* configuration space */
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#define VIRTIO_PCI_CONFIG_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_enabled(dev))
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static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
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VirtIOPCIProxy *dev);
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static void virtio_pci_reset(DeviceState *qdev);
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/* virtio device */
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/* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
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static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
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{
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return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
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}
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/* DeviceState to VirtIOPCIProxy. Note: used on datapath,
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* be careful and test performance if you change this.
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*/
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static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d)
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{
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return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
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}
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static void virtio_pci_notify(DeviceState *d, uint16_t vector)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d);
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if (msix_enabled(&proxy->pci_dev)) {
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if (vector != VIRTIO_NO_VECTOR) {
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msix_notify(&proxy->pci_dev, vector);
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}
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} else {
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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pci_set_irq(&proxy->pci_dev, qatomic_read(&vdev->isr) & 1);
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}
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}
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static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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pci_device_save(&proxy->pci_dev, f);
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msix_save(&proxy->pci_dev, f);
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if (msix_present(&proxy->pci_dev))
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qemu_put_be16(f, vdev->config_vector);
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}
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static const VMStateDescription vmstate_virtio_pci_modern_queue_state = {
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.name = "virtio_pci/modern_queue_state",
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_UINT16(num, VirtIOPCIQueue),
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VMSTATE_UNUSED(1), /* enabled was stored as be16 */
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VMSTATE_BOOL(enabled, VirtIOPCIQueue),
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VMSTATE_UINT32_ARRAY(desc, VirtIOPCIQueue, 2),
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VMSTATE_UINT32_ARRAY(avail, VirtIOPCIQueue, 2),
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VMSTATE_UINT32_ARRAY(used, VirtIOPCIQueue, 2),
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VMSTATE_END_OF_LIST()
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}
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};
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static bool virtio_pci_modern_state_needed(void *opaque)
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{
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VirtIOPCIProxy *proxy = opaque;
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return virtio_pci_modern(proxy);
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}
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static const VMStateDescription vmstate_virtio_pci_modern_state_sub = {
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.name = "virtio_pci/modern_state",
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.version_id = 1,
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.minimum_version_id = 1,
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.needed = &virtio_pci_modern_state_needed,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(dfselect, VirtIOPCIProxy),
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VMSTATE_UINT32(gfselect, VirtIOPCIProxy),
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VMSTATE_UINT32_ARRAY(guest_features, VirtIOPCIProxy, 2),
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VMSTATE_STRUCT_ARRAY(vqs, VirtIOPCIProxy, VIRTIO_QUEUE_MAX, 0,
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vmstate_virtio_pci_modern_queue_state,
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VirtIOPCIQueue),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_virtio_pci = {
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.name = "virtio_pci",
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_END_OF_LIST()
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},
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.subsections = (const VMStateDescription*[]) {
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&vmstate_virtio_pci_modern_state_sub,
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NULL
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}
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};
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static bool virtio_pci_has_extra_state(DeviceState *d)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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return proxy->flags & VIRTIO_PCI_FLAG_MIGRATE_EXTRA;
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}
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static void virtio_pci_save_extra_state(DeviceState *d, QEMUFile *f)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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vmstate_save_state(f, &vmstate_virtio_pci, proxy, NULL);
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}
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static int virtio_pci_load_extra_state(DeviceState *d, QEMUFile *f)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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return vmstate_load_state(f, &vmstate_virtio_pci, proxy, 1);
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}
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static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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if (msix_present(&proxy->pci_dev))
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qemu_put_be16(f, virtio_queue_vector(vdev, n));
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}
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static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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uint16_t vector;
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int ret;
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ret = pci_device_load(&proxy->pci_dev, f);
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if (ret) {
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return ret;
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}
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msix_unuse_all_vectors(&proxy->pci_dev);
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msix_load(&proxy->pci_dev, f);
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if (msix_present(&proxy->pci_dev)) {
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qemu_get_be16s(f, &vector);
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if (vector != VIRTIO_NO_VECTOR && vector >= proxy->nvectors) {
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return -EINVAL;
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}
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} else {
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vector = VIRTIO_NO_VECTOR;
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}
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vdev->config_vector = vector;
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if (vector != VIRTIO_NO_VECTOR) {
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msix_vector_use(&proxy->pci_dev, vector);
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}
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return 0;
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}
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static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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uint16_t vector;
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if (msix_present(&proxy->pci_dev)) {
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qemu_get_be16s(f, &vector);
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if (vector != VIRTIO_NO_VECTOR && vector >= proxy->nvectors) {
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return -EINVAL;
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}
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} else {
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vector = VIRTIO_NO_VECTOR;
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}
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virtio_queue_set_vector(vdev, n, vector);
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if (vector != VIRTIO_NO_VECTOR) {
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msix_vector_use(&proxy->pci_dev, vector);
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}
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return 0;
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}
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static bool virtio_pci_ioeventfd_enabled(DeviceState *d)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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return (proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) != 0;
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}
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#define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000
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static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy)
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{
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return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ?
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QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4;
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}
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static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier *notifier,
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int n, bool assign)
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{
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VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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VirtQueue *vq = virtio_get_queue(vdev, n);
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bool legacy = virtio_pci_legacy(proxy);
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bool modern = virtio_pci_modern(proxy);
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bool fast_mmio = kvm_ioeventfd_any_length_enabled();
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bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
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MemoryRegion *modern_mr = &proxy->notify.mr;
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MemoryRegion *modern_notify_mr = &proxy->notify_pio.mr;
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MemoryRegion *legacy_mr = &proxy->bar;
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hwaddr modern_addr = virtio_pci_queue_mem_mult(proxy) *
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virtio_get_queue_index(vq);
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hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY;
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if (assign) {
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if (modern) {
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if (fast_mmio) {
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memory_region_add_eventfd(modern_mr, modern_addr, 0,
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false, n, notifier);
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} else {
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memory_region_add_eventfd(modern_mr, modern_addr, 2,
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false, n, notifier);
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}
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if (modern_pio) {
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memory_region_add_eventfd(modern_notify_mr, 0, 2,
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true, n, notifier);
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}
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}
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if (legacy) {
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memory_region_add_eventfd(legacy_mr, legacy_addr, 2,
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true, n, notifier);
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}
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} else {
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if (modern) {
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if (fast_mmio) {
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memory_region_del_eventfd(modern_mr, modern_addr, 0,
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false, n, notifier);
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} else {
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memory_region_del_eventfd(modern_mr, modern_addr, 2,
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false, n, notifier);
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}
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if (modern_pio) {
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memory_region_del_eventfd(modern_notify_mr, 0, 2,
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true, n, notifier);
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}
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}
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if (legacy) {
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memory_region_del_eventfd(legacy_mr, legacy_addr, 2,
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true, n, notifier);
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}
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}
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return 0;
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}
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static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
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{
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virtio_bus_start_ioeventfd(&proxy->bus);
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}
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static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
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{
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virtio_bus_stop_ioeventfd(&proxy->bus);
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}
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static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
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{
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VirtIOPCIProxy *proxy = opaque;
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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uint16_t vector;
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hwaddr pa;
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switch (addr) {
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case VIRTIO_PCI_GUEST_FEATURES:
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/* Guest does not negotiate properly? We have to assume nothing. */
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if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
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val = virtio_bus_get_vdev_bad_features(&proxy->bus);
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}
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virtio_set_features(vdev, val);
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break;
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case VIRTIO_PCI_QUEUE_PFN:
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pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
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if (pa == 0) {
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virtio_pci_reset(DEVICE(proxy));
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}
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else
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virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
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break;
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case VIRTIO_PCI_QUEUE_SEL:
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if (val < VIRTIO_QUEUE_MAX)
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vdev->queue_sel = val;
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break;
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case VIRTIO_PCI_QUEUE_NOTIFY:
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if (val < VIRTIO_QUEUE_MAX) {
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virtio_queue_notify(vdev, val);
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}
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break;
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case VIRTIO_PCI_STATUS:
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if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
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virtio_pci_stop_ioeventfd(proxy);
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}
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virtio_set_status(vdev, val & 0xFF);
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if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
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virtio_pci_start_ioeventfd(proxy);
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}
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if (vdev->status == 0) {
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virtio_pci_reset(DEVICE(proxy));
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}
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/* Linux before 2.6.34 drives the device without enabling
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the PCI device bus master bit. Enable it automatically
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for the guest. This is a PCI spec violation but so is
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initiating DMA with bus master bit clear. */
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if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) {
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pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
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proxy->pci_dev.config[PCI_COMMAND] |
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PCI_COMMAND_MASTER, 1);
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}
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break;
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case VIRTIO_MSI_CONFIG_VECTOR:
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if (vdev->config_vector != VIRTIO_NO_VECTOR) {
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msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
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}
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/* Make it possible for guest to discover an error took place. */
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if (val < proxy->nvectors) {
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msix_vector_use(&proxy->pci_dev, val);
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} else {
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val = VIRTIO_NO_VECTOR;
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}
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vdev->config_vector = val;
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break;
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case VIRTIO_MSI_QUEUE_VECTOR:
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vector = virtio_queue_vector(vdev, vdev->queue_sel);
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if (vector != VIRTIO_NO_VECTOR) {
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msix_vector_unuse(&proxy->pci_dev, vector);
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}
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/* Make it possible for guest to discover an error took place. */
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if (val < proxy->nvectors) {
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msix_vector_use(&proxy->pci_dev, val);
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} else {
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val = VIRTIO_NO_VECTOR;
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}
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virtio_queue_set_vector(vdev, vdev->queue_sel, val);
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break;
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default:
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qemu_log_mask(LOG_GUEST_ERROR,
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"%s: unexpected address 0x%x value 0x%x\n",
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__func__, addr, val);
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break;
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}
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}
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|
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static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
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{
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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uint32_t ret = 0xFFFFFFFF;
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|
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switch (addr) {
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case VIRTIO_PCI_HOST_FEATURES:
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ret = vdev->host_features;
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break;
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case VIRTIO_PCI_GUEST_FEATURES:
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ret = vdev->guest_features;
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break;
|
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case VIRTIO_PCI_QUEUE_PFN:
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ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
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>> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
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break;
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case VIRTIO_PCI_QUEUE_NUM:
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ret = virtio_queue_get_num(vdev, vdev->queue_sel);
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break;
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case VIRTIO_PCI_QUEUE_SEL:
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ret = vdev->queue_sel;
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break;
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case VIRTIO_PCI_STATUS:
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ret = vdev->status;
|
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break;
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case VIRTIO_PCI_ISR:
|
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/* reading from the ISR also clears it. */
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ret = qatomic_xchg(&vdev->isr, 0);
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pci_irq_deassert(&proxy->pci_dev);
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break;
|
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case VIRTIO_MSI_CONFIG_VECTOR:
|
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ret = vdev->config_vector;
|
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break;
|
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case VIRTIO_MSI_QUEUE_VECTOR:
|
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ret = virtio_queue_vector(vdev, vdev->queue_sel);
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break;
|
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default:
|
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break;
|
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}
|
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|
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return ret;
|
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}
|
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|
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static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
|
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unsigned size)
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{
|
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VirtIOPCIProxy *proxy = opaque;
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
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uint64_t val = 0;
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|
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if (vdev == NULL) {
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return UINT64_MAX;
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}
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|
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if (addr < config) {
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return virtio_ioport_read(proxy, addr);
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}
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addr -= config;
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|
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switch (size) {
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case 1:
|
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val = virtio_config_readb(vdev, addr);
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break;
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case 2:
|
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val = virtio_config_readw(vdev, addr);
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if (virtio_is_big_endian(vdev)) {
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val = bswap16(val);
|
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}
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break;
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case 4:
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val = virtio_config_readl(vdev, addr);
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if (virtio_is_big_endian(vdev)) {
|
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val = bswap32(val);
|
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}
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break;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static void virtio_pci_config_write(void *opaque, hwaddr addr,
|
|
uint64_t val, unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
|
|
if (vdev == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (addr < config) {
|
|
virtio_ioport_write(proxy, addr, val);
|
|
return;
|
|
}
|
|
addr -= config;
|
|
/*
|
|
* Virtio-PCI is odd. Ioports are LE but config space is target native
|
|
* endian.
|
|
*/
|
|
switch (size) {
|
|
case 1:
|
|
virtio_config_writeb(vdev, addr, val);
|
|
break;
|
|
case 2:
|
|
if (virtio_is_big_endian(vdev)) {
|
|
val = bswap16(val);
|
|
}
|
|
virtio_config_writew(vdev, addr, val);
|
|
break;
|
|
case 4:
|
|
if (virtio_is_big_endian(vdev)) {
|
|
val = bswap32(val);
|
|
}
|
|
virtio_config_writel(vdev, addr, val);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const MemoryRegionOps virtio_pci_config_ops = {
|
|
.read = virtio_pci_config_read,
|
|
.write = virtio_pci_config_write,
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 4,
|
|
},
|
|
.endianness = DEVICE_LITTLE_ENDIAN,
|
|
};
|
|
|
|
static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy,
|
|
hwaddr *off, int len)
|
|
{
|
|
int i;
|
|
VirtIOPCIRegion *reg;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(proxy->regs); ++i) {
|
|
reg = &proxy->regs[i];
|
|
if (*off >= reg->offset &&
|
|
*off + len <= reg->offset + reg->size) {
|
|
*off -= reg->offset;
|
|
return ®->mr;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Below are generic functions to do memcpy from/to an address space,
|
|
* without byteswaps, with input validation.
|
|
*
|
|
* As regular address_space_* APIs all do some kind of byteswap at least for
|
|
* some host/target combinations, we are forced to explicitly convert to a
|
|
* known-endianness integer value.
|
|
* It doesn't really matter which endian format to go through, so the code
|
|
* below selects the endian that causes the least amount of work on the given
|
|
* host.
|
|
*
|
|
* Note: host pointer must be aligned.
|
|
*/
|
|
static
|
|
void virtio_address_space_write(VirtIOPCIProxy *proxy, hwaddr addr,
|
|
const uint8_t *buf, int len)
|
|
{
|
|
uint64_t val;
|
|
MemoryRegion *mr;
|
|
|
|
/* address_space_* APIs assume an aligned address.
|
|
* As address is under guest control, handle illegal values.
|
|
*/
|
|
addr &= ~(len - 1);
|
|
|
|
mr = virtio_address_space_lookup(proxy, &addr, len);
|
|
if (!mr) {
|
|
return;
|
|
}
|
|
|
|
/* Make sure caller aligned buf properly */
|
|
assert(!(((uintptr_t)buf) & (len - 1)));
|
|
|
|
switch (len) {
|
|
case 1:
|
|
val = pci_get_byte(buf);
|
|
break;
|
|
case 2:
|
|
val = pci_get_word(buf);
|
|
break;
|
|
case 4:
|
|
val = pci_get_long(buf);
|
|
break;
|
|
default:
|
|
/* As length is under guest control, handle illegal values. */
|
|
return;
|
|
}
|
|
memory_region_dispatch_write(mr, addr, val, size_memop(len) | MO_LE,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
}
|
|
|
|
static void
|
|
virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr,
|
|
uint8_t *buf, int len)
|
|
{
|
|
uint64_t val;
|
|
MemoryRegion *mr;
|
|
|
|
/* address_space_* APIs assume an aligned address.
|
|
* As address is under guest control, handle illegal values.
|
|
*/
|
|
addr &= ~(len - 1);
|
|
|
|
mr = virtio_address_space_lookup(proxy, &addr, len);
|
|
if (!mr) {
|
|
return;
|
|
}
|
|
|
|
/* Make sure caller aligned buf properly */
|
|
assert(!(((uintptr_t)buf) & (len - 1)));
|
|
|
|
memory_region_dispatch_read(mr, addr, &val, size_memop(len) | MO_LE,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
switch (len) {
|
|
case 1:
|
|
pci_set_byte(buf, val);
|
|
break;
|
|
case 2:
|
|
pci_set_word(buf, val);
|
|
break;
|
|
case 4:
|
|
pci_set_long(buf, val);
|
|
break;
|
|
default:
|
|
/* As length is under guest control, handle illegal values. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
|
|
uint32_t val, int len)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
struct virtio_pci_cfg_cap *cfg;
|
|
|
|
pci_default_write_config(pci_dev, address, val, len);
|
|
|
|
if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
|
|
pcie_cap_flr_write_config(pci_dev, address, val, len);
|
|
}
|
|
|
|
if (range_covers_byte(address, len, PCI_COMMAND)) {
|
|
if (!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
|
|
virtio_set_disabled(vdev, true);
|
|
virtio_pci_stop_ioeventfd(proxy);
|
|
virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
|
|
} else {
|
|
virtio_set_disabled(vdev, false);
|
|
}
|
|
}
|
|
|
|
if (proxy->config_cap &&
|
|
ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap,
|
|
pci_cfg_data),
|
|
sizeof cfg->pci_cfg_data)) {
|
|
uint32_t off;
|
|
uint32_t len;
|
|
|
|
cfg = (void *)(proxy->pci_dev.config + proxy->config_cap);
|
|
off = le32_to_cpu(cfg->cap.offset);
|
|
len = le32_to_cpu(cfg->cap.length);
|
|
|
|
if (len == 1 || len == 2 || len == 4) {
|
|
assert(len <= sizeof cfg->pci_cfg_data);
|
|
virtio_address_space_write(proxy, off, cfg->pci_cfg_data, len);
|
|
}
|
|
}
|
|
}
|
|
|
|
static uint32_t virtio_read_config(PCIDevice *pci_dev,
|
|
uint32_t address, int len)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
|
|
struct virtio_pci_cfg_cap *cfg;
|
|
|
|
if (proxy->config_cap &&
|
|
ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap,
|
|
pci_cfg_data),
|
|
sizeof cfg->pci_cfg_data)) {
|
|
uint32_t off;
|
|
uint32_t len;
|
|
|
|
cfg = (void *)(proxy->pci_dev.config + proxy->config_cap);
|
|
off = le32_to_cpu(cfg->cap.offset);
|
|
len = le32_to_cpu(cfg->cap.length);
|
|
|
|
if (len == 1 || len == 2 || len == 4) {
|
|
assert(len <= sizeof cfg->pci_cfg_data);
|
|
virtio_address_space_read(proxy, off, cfg->pci_cfg_data, len);
|
|
}
|
|
}
|
|
|
|
return pci_default_read_config(pci_dev, address, len);
|
|
}
|
|
|
|
static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
|
|
unsigned int queue_no,
|
|
unsigned int vector)
|
|
{
|
|
VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
|
|
int ret;
|
|
|
|
if (irqfd->users == 0) {
|
|
KVMRouteChange c = kvm_irqchip_begin_route_changes(kvm_state);
|
|
ret = kvm_irqchip_add_msi_route(&c, vector, &proxy->pci_dev);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
kvm_irqchip_commit_route_changes(&c);
|
|
irqfd->virq = ret;
|
|
}
|
|
irqfd->users++;
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
|
|
unsigned int vector)
|
|
{
|
|
VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
|
|
if (--irqfd->users == 0) {
|
|
kvm_irqchip_release_virq(kvm_state, irqfd->virq);
|
|
}
|
|
}
|
|
|
|
static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
|
|
unsigned int queue_no,
|
|
unsigned int vector)
|
|
{
|
|
VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtQueue *vq = virtio_get_queue(vdev, queue_no);
|
|
EventNotifier *n = virtio_queue_get_guest_notifier(vq);
|
|
return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
|
|
}
|
|
|
|
static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
|
|
unsigned int queue_no,
|
|
unsigned int vector)
|
|
{
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtQueue *vq = virtio_get_queue(vdev, queue_no);
|
|
EventNotifier *n = virtio_queue_get_guest_notifier(vq);
|
|
VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
|
|
int ret;
|
|
|
|
ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq);
|
|
assert(ret == 0);
|
|
}
|
|
|
|
static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
|
|
{
|
|
PCIDevice *dev = &proxy->pci_dev;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
unsigned int vector;
|
|
int ret, queue_no;
|
|
|
|
for (queue_no = 0; queue_no < nvqs; queue_no++) {
|
|
if (!virtio_queue_get_num(vdev, queue_no)) {
|
|
break;
|
|
}
|
|
vector = virtio_queue_vector(vdev, queue_no);
|
|
if (vector >= msix_nr_vectors_allocated(dev)) {
|
|
continue;
|
|
}
|
|
ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
|
|
if (ret < 0) {
|
|
goto undo;
|
|
}
|
|
/* If guest supports masking, set up irqfd now.
|
|
* Otherwise, delay until unmasked in the frontend.
|
|
*/
|
|
if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
|
|
ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
|
|
if (ret < 0) {
|
|
kvm_virtio_pci_vq_vector_release(proxy, vector);
|
|
goto undo;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
undo:
|
|
while (--queue_no >= 0) {
|
|
vector = virtio_queue_vector(vdev, queue_no);
|
|
if (vector >= msix_nr_vectors_allocated(dev)) {
|
|
continue;
|
|
}
|
|
if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
|
|
kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
|
|
}
|
|
kvm_virtio_pci_vq_vector_release(proxy, vector);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
|
|
{
|
|
PCIDevice *dev = &proxy->pci_dev;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
unsigned int vector;
|
|
int queue_no;
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
|
|
for (queue_no = 0; queue_no < nvqs; queue_no++) {
|
|
if (!virtio_queue_get_num(vdev, queue_no)) {
|
|
break;
|
|
}
|
|
vector = virtio_queue_vector(vdev, queue_no);
|
|
if (vector >= msix_nr_vectors_allocated(dev)) {
|
|
continue;
|
|
}
|
|
/* If guest supports masking, clean up irqfd now.
|
|
* Otherwise, it was cleaned when masked in the frontend.
|
|
*/
|
|
if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
|
|
kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
|
|
}
|
|
kvm_virtio_pci_vq_vector_release(proxy, vector);
|
|
}
|
|
}
|
|
|
|
static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
|
|
unsigned int queue_no,
|
|
unsigned int vector,
|
|
MSIMessage msg)
|
|
{
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
VirtQueue *vq = virtio_get_queue(vdev, queue_no);
|
|
EventNotifier *n = virtio_queue_get_guest_notifier(vq);
|
|
VirtIOIRQFD *irqfd;
|
|
int ret = 0;
|
|
|
|
if (proxy->vector_irqfd) {
|
|
irqfd = &proxy->vector_irqfd[vector];
|
|
if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
|
|
ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg,
|
|
&proxy->pci_dev);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
kvm_irqchip_commit_routes(kvm_state);
|
|
}
|
|
}
|
|
|
|
/* If guest supports masking, irqfd is already setup, unmask it.
|
|
* Otherwise, set it up now.
|
|
*/
|
|
if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
|
|
k->guest_notifier_mask(vdev, queue_no, false);
|
|
/* Test after unmasking to avoid losing events. */
|
|
if (k->guest_notifier_pending &&
|
|
k->guest_notifier_pending(vdev, queue_no)) {
|
|
event_notifier_set(n);
|
|
}
|
|
} else {
|
|
ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
|
|
unsigned int queue_no,
|
|
unsigned int vector)
|
|
{
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
|
|
/* If guest supports masking, keep irqfd but mask it.
|
|
* Otherwise, clean it up now.
|
|
*/
|
|
if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
|
|
k->guest_notifier_mask(vdev, queue_no, true);
|
|
} else {
|
|
kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
|
|
}
|
|
}
|
|
|
|
static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
|
|
MSIMessage msg)
|
|
{
|
|
VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
|
|
int ret, index, unmasked = 0;
|
|
|
|
while (vq) {
|
|
index = virtio_get_queue_index(vq);
|
|
if (!virtio_queue_get_num(vdev, index)) {
|
|
break;
|
|
}
|
|
if (index < proxy->nvqs_with_notifiers) {
|
|
ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg);
|
|
if (ret < 0) {
|
|
goto undo;
|
|
}
|
|
++unmasked;
|
|
}
|
|
vq = virtio_vector_next_queue(vq);
|
|
}
|
|
|
|
return 0;
|
|
|
|
undo:
|
|
vq = virtio_vector_first_queue(vdev, vector);
|
|
while (vq && unmasked >= 0) {
|
|
index = virtio_get_queue_index(vq);
|
|
if (index < proxy->nvqs_with_notifiers) {
|
|
virtio_pci_vq_vector_mask(proxy, index, vector);
|
|
--unmasked;
|
|
}
|
|
vq = virtio_vector_next_queue(vq);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
|
|
{
|
|
VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
|
|
int index;
|
|
|
|
while (vq) {
|
|
index = virtio_get_queue_index(vq);
|
|
if (!virtio_queue_get_num(vdev, index)) {
|
|
break;
|
|
}
|
|
if (index < proxy->nvqs_with_notifiers) {
|
|
virtio_pci_vq_vector_mask(proxy, index, vector);
|
|
}
|
|
vq = virtio_vector_next_queue(vq);
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_vector_poll(PCIDevice *dev,
|
|
unsigned int vector_start,
|
|
unsigned int vector_end)
|
|
{
|
|
VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
int queue_no;
|
|
unsigned int vector;
|
|
EventNotifier *notifier;
|
|
VirtQueue *vq;
|
|
|
|
for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
|
|
if (!virtio_queue_get_num(vdev, queue_no)) {
|
|
break;
|
|
}
|
|
vector = virtio_queue_vector(vdev, queue_no);
|
|
if (vector < vector_start || vector >= vector_end ||
|
|
!msix_is_masked(dev, vector)) {
|
|
continue;
|
|
}
|
|
vq = virtio_get_queue(vdev, queue_no);
|
|
notifier = virtio_queue_get_guest_notifier(vq);
|
|
if (k->guest_notifier_pending) {
|
|
if (k->guest_notifier_pending(vdev, queue_no)) {
|
|
msix_set_pending(dev, vector);
|
|
}
|
|
} else if (event_notifier_test_and_clear(notifier)) {
|
|
msix_set_pending(dev, vector);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
|
|
bool with_irqfd)
|
|
{
|
|
VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
VirtQueue *vq = virtio_get_queue(vdev, n);
|
|
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
|
|
|
|
if (assign) {
|
|
int r = event_notifier_init(notifier, 0);
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
|
|
} else {
|
|
virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
|
|
event_notifier_cleanup(notifier);
|
|
}
|
|
|
|
if (!msix_enabled(&proxy->pci_dev) &&
|
|
vdev->use_guest_notifier_mask &&
|
|
vdc->guest_notifier_mask) {
|
|
vdc->guest_notifier_mask(vdev, n, !assign);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool virtio_pci_query_guest_notifiers(DeviceState *d)
|
|
{
|
|
VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
|
|
return msix_enabled(&proxy->pci_dev);
|
|
}
|
|
|
|
static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
|
|
{
|
|
VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
int r, n;
|
|
bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
|
|
kvm_msi_via_irqfd_enabled();
|
|
|
|
nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX);
|
|
|
|
/*
|
|
* When deassigning, pass a consistent nvqs value to avoid leaking
|
|
* notifiers. But first check we've actually been configured, exit
|
|
* early if we haven't.
|
|
*/
|
|
if (!assign && !proxy->nvqs_with_notifiers) {
|
|
return 0;
|
|
}
|
|
assert(assign || nvqs == proxy->nvqs_with_notifiers);
|
|
|
|
proxy->nvqs_with_notifiers = nvqs;
|
|
|
|
/* Must unset vector notifier while guest notifier is still assigned */
|
|
if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
|
|
msix_unset_vector_notifiers(&proxy->pci_dev);
|
|
if (proxy->vector_irqfd) {
|
|
kvm_virtio_pci_vector_release(proxy, nvqs);
|
|
g_free(proxy->vector_irqfd);
|
|
proxy->vector_irqfd = NULL;
|
|
}
|
|
}
|
|
|
|
for (n = 0; n < nvqs; n++) {
|
|
if (!virtio_queue_get_num(vdev, n)) {
|
|
break;
|
|
}
|
|
|
|
r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd);
|
|
if (r < 0) {
|
|
goto assign_error;
|
|
}
|
|
}
|
|
|
|
/* Must set vector notifier after guest notifier has been assigned */
|
|
if ((with_irqfd || k->guest_notifier_mask) && assign) {
|
|
if (with_irqfd) {
|
|
proxy->vector_irqfd =
|
|
g_malloc0(sizeof(*proxy->vector_irqfd) *
|
|
msix_nr_vectors_allocated(&proxy->pci_dev));
|
|
r = kvm_virtio_pci_vector_use(proxy, nvqs);
|
|
if (r < 0) {
|
|
goto assign_error;
|
|
}
|
|
}
|
|
r = msix_set_vector_notifiers(&proxy->pci_dev,
|
|
virtio_pci_vector_unmask,
|
|
virtio_pci_vector_mask,
|
|
virtio_pci_vector_poll);
|
|
if (r < 0) {
|
|
goto notifiers_error;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
notifiers_error:
|
|
if (with_irqfd) {
|
|
assert(assign);
|
|
kvm_virtio_pci_vector_release(proxy, nvqs);
|
|
}
|
|
|
|
assign_error:
|
|
/* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
|
|
assert(assign);
|
|
while (--n >= 0) {
|
|
virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static int virtio_pci_set_host_notifier_mr(DeviceState *d, int n,
|
|
MemoryRegion *mr, bool assign)
|
|
{
|
|
VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
|
|
int offset;
|
|
|
|
if (n >= VIRTIO_QUEUE_MAX || !virtio_pci_modern(proxy) ||
|
|
virtio_pci_queue_mem_mult(proxy) != memory_region_size(mr)) {
|
|
return -1;
|
|
}
|
|
|
|
if (assign) {
|
|
offset = virtio_pci_queue_mem_mult(proxy) * n;
|
|
memory_region_add_subregion_overlap(&proxy->notify.mr, offset, mr, 1);
|
|
} else {
|
|
memory_region_del_subregion(&proxy->notify.mr, mr);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void virtio_pci_vmstate_change(DeviceState *d, bool running)
|
|
{
|
|
VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
|
|
if (running) {
|
|
/* Old QEMU versions did not set bus master enable on status write.
|
|
* Detect DRIVER set and enable it.
|
|
*/
|
|
if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) &&
|
|
(vdev->status & VIRTIO_CONFIG_S_DRIVER) &&
|
|
!(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
|
|
pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
|
|
proxy->pci_dev.config[PCI_COMMAND] |
|
|
PCI_COMMAND_MASTER, 1);
|
|
}
|
|
virtio_pci_start_ioeventfd(proxy);
|
|
} else {
|
|
virtio_pci_stop_ioeventfd(proxy);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
|
|
*/
|
|
|
|
static int virtio_pci_query_nvectors(DeviceState *d)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
|
|
|
|
return proxy->nvectors;
|
|
}
|
|
|
|
static AddressSpace *virtio_pci_get_dma_as(DeviceState *d)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
|
|
PCIDevice *dev = &proxy->pci_dev;
|
|
|
|
return pci_get_address_space(dev);
|
|
}
|
|
|
|
static bool virtio_pci_iommu_enabled(DeviceState *d)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
|
|
PCIDevice *dev = &proxy->pci_dev;
|
|
AddressSpace *dma_as = pci_device_iommu_address_space(dev);
|
|
|
|
if (dma_as == &address_space_memory) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool virtio_pci_queue_enabled(DeviceState *d, int n)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
|
|
return proxy->vqs[n].enabled;
|
|
}
|
|
|
|
return virtio_queue_enabled_legacy(vdev, n);
|
|
}
|
|
|
|
static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
|
|
struct virtio_pci_cap *cap)
|
|
{
|
|
PCIDevice *dev = &proxy->pci_dev;
|
|
int offset;
|
|
|
|
offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, 0,
|
|
cap->cap_len, &error_abort);
|
|
|
|
assert(cap->cap_len >= sizeof *cap);
|
|
memcpy(dev->config + offset + PCI_CAP_FLAGS, &cap->cap_len,
|
|
cap->cap_len - PCI_CAP_FLAGS);
|
|
|
|
return offset;
|
|
}
|
|
|
|
static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
|
|
unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
uint32_t val = 0;
|
|
int i;
|
|
|
|
if (vdev == NULL) {
|
|
return UINT64_MAX;
|
|
}
|
|
|
|
switch (addr) {
|
|
case VIRTIO_PCI_COMMON_DFSELECT:
|
|
val = proxy->dfselect;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_DF:
|
|
if (proxy->dfselect <= 1) {
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
|
|
val = (vdev->host_features & ~vdc->legacy_features) >>
|
|
(32 * proxy->dfselect);
|
|
}
|
|
break;
|
|
case VIRTIO_PCI_COMMON_GFSELECT:
|
|
val = proxy->gfselect;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_GF:
|
|
if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
|
|
val = proxy->guest_features[proxy->gfselect];
|
|
}
|
|
break;
|
|
case VIRTIO_PCI_COMMON_MSIX:
|
|
val = vdev->config_vector;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_NUMQ:
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; ++i) {
|
|
if (virtio_queue_get_num(vdev, i)) {
|
|
val = i + 1;
|
|
}
|
|
}
|
|
break;
|
|
case VIRTIO_PCI_COMMON_STATUS:
|
|
val = vdev->status;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_CFGGENERATION:
|
|
val = vdev->generation;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_SELECT:
|
|
val = vdev->queue_sel;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_SIZE:
|
|
val = virtio_queue_get_num(vdev, vdev->queue_sel);
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_MSIX:
|
|
val = virtio_queue_vector(vdev, vdev->queue_sel);
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_ENABLE:
|
|
val = proxy->vqs[vdev->queue_sel].enabled;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_NOFF:
|
|
/* Simply map queues in order */
|
|
val = vdev->queue_sel;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_DESCLO:
|
|
val = proxy->vqs[vdev->queue_sel].desc[0];
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_DESCHI:
|
|
val = proxy->vqs[vdev->queue_sel].desc[1];
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_AVAILLO:
|
|
val = proxy->vqs[vdev->queue_sel].avail[0];
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_AVAILHI:
|
|
val = proxy->vqs[vdev->queue_sel].avail[1];
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_USEDLO:
|
|
val = proxy->vqs[vdev->queue_sel].used[0];
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_USEDHI:
|
|
val = proxy->vqs[vdev->queue_sel].used[1];
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_RESET:
|
|
val = proxy->vqs[vdev->queue_sel].reset;
|
|
break;
|
|
default:
|
|
val = 0;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static void virtio_pci_common_write(void *opaque, hwaddr addr,
|
|
uint64_t val, unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
uint16_t vector;
|
|
|
|
if (vdev == NULL) {
|
|
return;
|
|
}
|
|
|
|
switch (addr) {
|
|
case VIRTIO_PCI_COMMON_DFSELECT:
|
|
proxy->dfselect = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_GFSELECT:
|
|
proxy->gfselect = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_GF:
|
|
if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
|
|
proxy->guest_features[proxy->gfselect] = val;
|
|
virtio_set_features(vdev,
|
|
(((uint64_t)proxy->guest_features[1]) << 32) |
|
|
proxy->guest_features[0]);
|
|
}
|
|
break;
|
|
case VIRTIO_PCI_COMMON_MSIX:
|
|
if (vdev->config_vector != VIRTIO_NO_VECTOR) {
|
|
msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
|
|
}
|
|
/* Make it possible for guest to discover an error took place. */
|
|
if (val < proxy->nvectors) {
|
|
msix_vector_use(&proxy->pci_dev, val);
|
|
} else {
|
|
val = VIRTIO_NO_VECTOR;
|
|
}
|
|
vdev->config_vector = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_STATUS:
|
|
if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
virtio_pci_stop_ioeventfd(proxy);
|
|
}
|
|
|
|
virtio_set_status(vdev, val & 0xFF);
|
|
|
|
if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
|
|
virtio_pci_start_ioeventfd(proxy);
|
|
}
|
|
|
|
if (vdev->status == 0) {
|
|
virtio_pci_reset(DEVICE(proxy));
|
|
}
|
|
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_SELECT:
|
|
if (val < VIRTIO_QUEUE_MAX) {
|
|
vdev->queue_sel = val;
|
|
}
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_SIZE:
|
|
proxy->vqs[vdev->queue_sel].num = val;
|
|
virtio_queue_set_num(vdev, vdev->queue_sel,
|
|
proxy->vqs[vdev->queue_sel].num);
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_MSIX:
|
|
vector = virtio_queue_vector(vdev, vdev->queue_sel);
|
|
if (vector != VIRTIO_NO_VECTOR) {
|
|
msix_vector_unuse(&proxy->pci_dev, vector);
|
|
}
|
|
/* Make it possible for guest to discover an error took place. */
|
|
if (val < proxy->nvectors) {
|
|
msix_vector_use(&proxy->pci_dev, val);
|
|
} else {
|
|
val = VIRTIO_NO_VECTOR;
|
|
}
|
|
virtio_queue_set_vector(vdev, vdev->queue_sel, val);
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_ENABLE:
|
|
if (val == 1) {
|
|
virtio_queue_set_num(vdev, vdev->queue_sel,
|
|
proxy->vqs[vdev->queue_sel].num);
|
|
virtio_queue_set_rings(vdev, vdev->queue_sel,
|
|
((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 |
|
|
proxy->vqs[vdev->queue_sel].desc[0],
|
|
((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 |
|
|
proxy->vqs[vdev->queue_sel].avail[0],
|
|
((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 |
|
|
proxy->vqs[vdev->queue_sel].used[0]);
|
|
proxy->vqs[vdev->queue_sel].enabled = 1;
|
|
proxy->vqs[vdev->queue_sel].reset = 0;
|
|
virtio_queue_enable(vdev, vdev->queue_sel);
|
|
} else {
|
|
virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val);
|
|
}
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_DESCLO:
|
|
proxy->vqs[vdev->queue_sel].desc[0] = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_DESCHI:
|
|
proxy->vqs[vdev->queue_sel].desc[1] = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_AVAILLO:
|
|
proxy->vqs[vdev->queue_sel].avail[0] = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_AVAILHI:
|
|
proxy->vqs[vdev->queue_sel].avail[1] = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_USEDLO:
|
|
proxy->vqs[vdev->queue_sel].used[0] = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_USEDHI:
|
|
proxy->vqs[vdev->queue_sel].used[1] = val;
|
|
break;
|
|
case VIRTIO_PCI_COMMON_Q_RESET:
|
|
if (val == 1) {
|
|
proxy->vqs[vdev->queue_sel].reset = 1;
|
|
|
|
virtio_queue_reset(vdev, vdev->queue_sel);
|
|
|
|
proxy->vqs[vdev->queue_sel].reset = 0;
|
|
proxy->vqs[vdev->queue_sel].enabled = 0;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr,
|
|
unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
if (virtio_bus_get_device(&proxy->bus) == NULL) {
|
|
return UINT64_MAX;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void virtio_pci_notify_write(void *opaque, hwaddr addr,
|
|
uint64_t val, unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
|
|
unsigned queue = addr / virtio_pci_queue_mem_mult(proxy);
|
|
|
|
if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
|
|
trace_virtio_pci_notify_write(addr, val, size);
|
|
virtio_queue_notify(vdev, queue);
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr,
|
|
uint64_t val, unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
|
|
unsigned queue = val;
|
|
|
|
if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
|
|
trace_virtio_pci_notify_write_pio(addr, val, size);
|
|
virtio_queue_notify(vdev, queue);
|
|
}
|
|
}
|
|
|
|
static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr,
|
|
unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
uint64_t val;
|
|
|
|
if (vdev == NULL) {
|
|
return UINT64_MAX;
|
|
}
|
|
|
|
val = qatomic_xchg(&vdev->isr, 0);
|
|
pci_irq_deassert(&proxy->pci_dev);
|
|
return val;
|
|
}
|
|
|
|
static void virtio_pci_isr_write(void *opaque, hwaddr addr,
|
|
uint64_t val, unsigned size)
|
|
{
|
|
}
|
|
|
|
static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr,
|
|
unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
uint64_t val;
|
|
|
|
if (vdev == NULL) {
|
|
return UINT64_MAX;
|
|
}
|
|
|
|
switch (size) {
|
|
case 1:
|
|
val = virtio_config_modern_readb(vdev, addr);
|
|
break;
|
|
case 2:
|
|
val = virtio_config_modern_readw(vdev, addr);
|
|
break;
|
|
case 4:
|
|
val = virtio_config_modern_readl(vdev, addr);
|
|
break;
|
|
default:
|
|
val = 0;
|
|
break;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static void virtio_pci_device_write(void *opaque, hwaddr addr,
|
|
uint64_t val, unsigned size)
|
|
{
|
|
VirtIOPCIProxy *proxy = opaque;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
|
|
if (vdev == NULL) {
|
|
return;
|
|
}
|
|
|
|
switch (size) {
|
|
case 1:
|
|
virtio_config_modern_writeb(vdev, addr, val);
|
|
break;
|
|
case 2:
|
|
virtio_config_modern_writew(vdev, addr, val);
|
|
break;
|
|
case 4:
|
|
virtio_config_modern_writel(vdev, addr, val);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy,
|
|
const char *vdev_name)
|
|
{
|
|
static const MemoryRegionOps common_ops = {
|
|
.read = virtio_pci_common_read,
|
|
.write = virtio_pci_common_write,
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 4,
|
|
},
|
|
.endianness = DEVICE_LITTLE_ENDIAN,
|
|
};
|
|
static const MemoryRegionOps isr_ops = {
|
|
.read = virtio_pci_isr_read,
|
|
.write = virtio_pci_isr_write,
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 4,
|
|
},
|
|
.endianness = DEVICE_LITTLE_ENDIAN,
|
|
};
|
|
static const MemoryRegionOps device_ops = {
|
|
.read = virtio_pci_device_read,
|
|
.write = virtio_pci_device_write,
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 4,
|
|
},
|
|
.endianness = DEVICE_LITTLE_ENDIAN,
|
|
};
|
|
static const MemoryRegionOps notify_ops = {
|
|
.read = virtio_pci_notify_read,
|
|
.write = virtio_pci_notify_write,
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 4,
|
|
},
|
|
.endianness = DEVICE_LITTLE_ENDIAN,
|
|
};
|
|
static const MemoryRegionOps notify_pio_ops = {
|
|
.read = virtio_pci_notify_read,
|
|
.write = virtio_pci_notify_write_pio,
|
|
.impl = {
|
|
.min_access_size = 1,
|
|
.max_access_size = 4,
|
|
},
|
|
.endianness = DEVICE_LITTLE_ENDIAN,
|
|
};
|
|
g_autoptr(GString) name = g_string_new(NULL);
|
|
|
|
g_string_printf(name, "virtio-pci-common-%s", vdev_name);
|
|
memory_region_init_io(&proxy->common.mr, OBJECT(proxy),
|
|
&common_ops,
|
|
proxy,
|
|
name->str,
|
|
proxy->common.size);
|
|
|
|
g_string_printf(name, "virtio-pci-isr-%s", vdev_name);
|
|
memory_region_init_io(&proxy->isr.mr, OBJECT(proxy),
|
|
&isr_ops,
|
|
proxy,
|
|
name->str,
|
|
proxy->isr.size);
|
|
|
|
g_string_printf(name, "virtio-pci-device-%s", vdev_name);
|
|
memory_region_init_io(&proxy->device.mr, OBJECT(proxy),
|
|
&device_ops,
|
|
proxy,
|
|
name->str,
|
|
proxy->device.size);
|
|
|
|
g_string_printf(name, "virtio-pci-notify-%s", vdev_name);
|
|
memory_region_init_io(&proxy->notify.mr, OBJECT(proxy),
|
|
¬ify_ops,
|
|
proxy,
|
|
name->str,
|
|
proxy->notify.size);
|
|
|
|
g_string_printf(name, "virtio-pci-notify-pio-%s", vdev_name);
|
|
memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy),
|
|
¬ify_pio_ops,
|
|
proxy,
|
|
name->str,
|
|
proxy->notify_pio.size);
|
|
}
|
|
|
|
static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy,
|
|
VirtIOPCIRegion *region,
|
|
struct virtio_pci_cap *cap,
|
|
MemoryRegion *mr,
|
|
uint8_t bar)
|
|
{
|
|
memory_region_add_subregion(mr, region->offset, ®ion->mr);
|
|
|
|
cap->cfg_type = region->type;
|
|
cap->bar = bar;
|
|
cap->offset = cpu_to_le32(region->offset);
|
|
cap->length = cpu_to_le32(region->size);
|
|
virtio_pci_add_mem_cap(proxy, cap);
|
|
|
|
}
|
|
|
|
static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy *proxy,
|
|
VirtIOPCIRegion *region,
|
|
struct virtio_pci_cap *cap)
|
|
{
|
|
virtio_pci_modern_region_map(proxy, region, cap,
|
|
&proxy->modern_bar, proxy->modern_mem_bar_idx);
|
|
}
|
|
|
|
static void virtio_pci_modern_io_region_map(VirtIOPCIProxy *proxy,
|
|
VirtIOPCIRegion *region,
|
|
struct virtio_pci_cap *cap)
|
|
{
|
|
virtio_pci_modern_region_map(proxy, region, cap,
|
|
&proxy->io_bar, proxy->modern_io_bar_idx);
|
|
}
|
|
|
|
static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy *proxy,
|
|
VirtIOPCIRegion *region)
|
|
{
|
|
memory_region_del_subregion(&proxy->modern_bar,
|
|
®ion->mr);
|
|
}
|
|
|
|
static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy,
|
|
VirtIOPCIRegion *region)
|
|
{
|
|
memory_region_del_subregion(&proxy->io_bar,
|
|
®ion->mr);
|
|
}
|
|
|
|
static void virtio_pci_pre_plugged(DeviceState *d, Error **errp)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
|
|
if (virtio_pci_modern(proxy)) {
|
|
virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1);
|
|
}
|
|
|
|
virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE);
|
|
}
|
|
|
|
/* This is called by virtio-bus just after the device is plugged. */
|
|
static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
|
|
VirtioBusState *bus = &proxy->bus;
|
|
bool legacy = virtio_pci_legacy(proxy);
|
|
bool modern;
|
|
bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
|
|
uint8_t *config;
|
|
uint32_t size;
|
|
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
|
|
|
|
/*
|
|
* Virtio capabilities present without
|
|
* VIRTIO_F_VERSION_1 confuses guests
|
|
*/
|
|
if (!proxy->ignore_backend_features &&
|
|
!virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) {
|
|
virtio_pci_disable_modern(proxy);
|
|
|
|
if (!legacy) {
|
|
error_setg(errp, "Device doesn't support modern mode, and legacy"
|
|
" mode is disabled");
|
|
error_append_hint(errp, "Set disable-legacy to off\n");
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
modern = virtio_pci_modern(proxy);
|
|
|
|
config = proxy->pci_dev.config;
|
|
if (proxy->class_code) {
|
|
pci_config_set_class(config, proxy->class_code);
|
|
}
|
|
|
|
if (legacy) {
|
|
if (!virtio_legacy_allowed(vdev)) {
|
|
/*
|
|
* To avoid migration issues, we allow legacy mode when legacy
|
|
* check is disabled in the old machine types (< 5.1).
|
|
*/
|
|
if (virtio_legacy_check_disabled(vdev)) {
|
|
warn_report("device is modern-only, but for backward "
|
|
"compatibility legacy is allowed");
|
|
} else {
|
|
error_setg(errp,
|
|
"device is modern-only, use disable-legacy=on");
|
|
return;
|
|
}
|
|
}
|
|
if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
|
|
error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by"
|
|
" neither legacy nor transitional device");
|
|
return;
|
|
}
|
|
/*
|
|
* Legacy and transitional devices use specific subsystem IDs.
|
|
* Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID)
|
|
* is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default.
|
|
*/
|
|
pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
|
|
} else {
|
|
/* pure virtio-1.0 */
|
|
pci_set_word(config + PCI_VENDOR_ID,
|
|
PCI_VENDOR_ID_REDHAT_QUMRANET);
|
|
pci_set_word(config + PCI_DEVICE_ID,
|
|
PCI_DEVICE_ID_VIRTIO_10_BASE + virtio_bus_get_vdev_id(bus));
|
|
pci_config_set_revision(config, 1);
|
|
}
|
|
config[PCI_INTERRUPT_PIN] = 1;
|
|
|
|
|
|
if (modern) {
|
|
struct virtio_pci_cap cap = {
|
|
.cap_len = sizeof cap,
|
|
};
|
|
struct virtio_pci_notify_cap notify = {
|
|
.cap.cap_len = sizeof notify,
|
|
.notify_off_multiplier =
|
|
cpu_to_le32(virtio_pci_queue_mem_mult(proxy)),
|
|
};
|
|
struct virtio_pci_cfg_cap cfg = {
|
|
.cap.cap_len = sizeof cfg,
|
|
.cap.cfg_type = VIRTIO_PCI_CAP_PCI_CFG,
|
|
};
|
|
struct virtio_pci_notify_cap notify_pio = {
|
|
.cap.cap_len = sizeof notify,
|
|
.notify_off_multiplier = cpu_to_le32(0x0),
|
|
};
|
|
|
|
struct virtio_pci_cfg_cap *cfg_mask;
|
|
|
|
virtio_pci_modern_regions_init(proxy, vdev->name);
|
|
|
|
virtio_pci_modern_mem_region_map(proxy, &proxy->common, &cap);
|
|
virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap);
|
|
virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap);
|
|
virtio_pci_modern_mem_region_map(proxy, &proxy->notify, ¬ify.cap);
|
|
|
|
if (modern_pio) {
|
|
memory_region_init(&proxy->io_bar, OBJECT(proxy),
|
|
"virtio-pci-io", 0x4);
|
|
|
|
pci_register_bar(&proxy->pci_dev, proxy->modern_io_bar_idx,
|
|
PCI_BASE_ADDRESS_SPACE_IO, &proxy->io_bar);
|
|
|
|
virtio_pci_modern_io_region_map(proxy, &proxy->notify_pio,
|
|
¬ify_pio.cap);
|
|
}
|
|
|
|
pci_register_bar(&proxy->pci_dev, proxy->modern_mem_bar_idx,
|
|
PCI_BASE_ADDRESS_SPACE_MEMORY |
|
|
PCI_BASE_ADDRESS_MEM_PREFETCH |
|
|
PCI_BASE_ADDRESS_MEM_TYPE_64,
|
|
&proxy->modern_bar);
|
|
|
|
proxy->config_cap = virtio_pci_add_mem_cap(proxy, &cfg.cap);
|
|
cfg_mask = (void *)(proxy->pci_dev.wmask + proxy->config_cap);
|
|
pci_set_byte(&cfg_mask->cap.bar, ~0x0);
|
|
pci_set_long((uint8_t *)&cfg_mask->cap.offset, ~0x0);
|
|
pci_set_long((uint8_t *)&cfg_mask->cap.length, ~0x0);
|
|
pci_set_long(cfg_mask->pci_cfg_data, ~0x0);
|
|
}
|
|
|
|
if (proxy->nvectors) {
|
|
int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors,
|
|
proxy->msix_bar_idx, NULL);
|
|
if (err) {
|
|
/* Notice when a system that supports MSIx can't initialize it */
|
|
if (err != -ENOTSUP) {
|
|
warn_report("unable to init msix vectors to %" PRIu32,
|
|
proxy->nvectors);
|
|
}
|
|
proxy->nvectors = 0;
|
|
}
|
|
}
|
|
|
|
proxy->pci_dev.config_write = virtio_write_config;
|
|
proxy->pci_dev.config_read = virtio_read_config;
|
|
|
|
if (legacy) {
|
|
size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
|
|
+ virtio_bus_get_vdev_config_len(bus);
|
|
size = pow2ceil(size);
|
|
|
|
memory_region_init_io(&proxy->bar, OBJECT(proxy),
|
|
&virtio_pci_config_ops,
|
|
proxy, "virtio-pci", size);
|
|
|
|
pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx,
|
|
PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar);
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_device_unplugged(DeviceState *d)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
|
|
bool modern = virtio_pci_modern(proxy);
|
|
bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
|
|
|
|
virtio_pci_stop_ioeventfd(proxy);
|
|
|
|
if (modern) {
|
|
virtio_pci_modern_mem_region_unmap(proxy, &proxy->common);
|
|
virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr);
|
|
virtio_pci_modern_mem_region_unmap(proxy, &proxy->device);
|
|
virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify);
|
|
if (modern_pio) {
|
|
virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
|
|
VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
|
|
bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) &&
|
|
!pci_bus_is_root(pci_get_bus(pci_dev));
|
|
|
|
if (kvm_enabled() && !kvm_has_many_ioeventfds()) {
|
|
proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
|
|
}
|
|
|
|
/* fd-based ioevents can't be synchronized in record/replay */
|
|
if (replay_mode != REPLAY_MODE_NONE) {
|
|
proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
|
|
}
|
|
|
|
/*
|
|
* virtio pci bar layout used by default.
|
|
* subclasses can re-arrange things if needed.
|
|
*
|
|
* region 0 -- virtio legacy io bar
|
|
* region 1 -- msi-x bar
|
|
* region 2 -- virtio modern io bar (off by default)
|
|
* region 4+5 -- virtio modern memory (64bit) bar
|
|
*
|
|
*/
|
|
proxy->legacy_io_bar_idx = 0;
|
|
proxy->msix_bar_idx = 1;
|
|
proxy->modern_io_bar_idx = 2;
|
|
proxy->modern_mem_bar_idx = 4;
|
|
|
|
proxy->common.offset = 0x0;
|
|
proxy->common.size = 0x1000;
|
|
proxy->common.type = VIRTIO_PCI_CAP_COMMON_CFG;
|
|
|
|
proxy->isr.offset = 0x1000;
|
|
proxy->isr.size = 0x1000;
|
|
proxy->isr.type = VIRTIO_PCI_CAP_ISR_CFG;
|
|
|
|
proxy->device.offset = 0x2000;
|
|
proxy->device.size = 0x1000;
|
|
proxy->device.type = VIRTIO_PCI_CAP_DEVICE_CFG;
|
|
|
|
proxy->notify.offset = 0x3000;
|
|
proxy->notify.size = virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX;
|
|
proxy->notify.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
|
|
|
|
proxy->notify_pio.offset = 0x0;
|
|
proxy->notify_pio.size = 0x4;
|
|
proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
|
|
|
|
/* subclasses can enforce modern, so do this unconditionally */
|
|
memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
|
|
/* PCI BAR regions must be powers of 2 */
|
|
pow2ceil(proxy->notify.offset + proxy->notify.size));
|
|
|
|
if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
|
|
proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
|
|
}
|
|
|
|
if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) {
|
|
error_setg(errp, "device cannot work as neither modern nor legacy mode"
|
|
" is enabled");
|
|
error_append_hint(errp, "Set either disable-modern or disable-legacy"
|
|
" to off\n");
|
|
return;
|
|
}
|
|
|
|
if (pcie_port && pci_is_express(pci_dev)) {
|
|
int pos;
|
|
uint16_t last_pcie_cap_offset = PCI_CONFIG_SPACE_SIZE;
|
|
|
|
pos = pcie_endpoint_cap_init(pci_dev, 0);
|
|
assert(pos > 0);
|
|
|
|
pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0,
|
|
PCI_PM_SIZEOF, errp);
|
|
if (pos < 0) {
|
|
return;
|
|
}
|
|
|
|
pci_dev->exp.pm_cap = pos;
|
|
|
|
/*
|
|
* Indicates that this function complies with revision 1.2 of the
|
|
* PCI Power Management Interface Specification.
|
|
*/
|
|
pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3);
|
|
|
|
if (proxy->flags & VIRTIO_PCI_FLAG_AER) {
|
|
pcie_aer_init(pci_dev, PCI_ERR_VER, last_pcie_cap_offset,
|
|
PCI_ERR_SIZEOF, NULL);
|
|
last_pcie_cap_offset += PCI_ERR_SIZEOF;
|
|
}
|
|
|
|
if (proxy->flags & VIRTIO_PCI_FLAG_INIT_DEVERR) {
|
|
/* Init error enabling flags */
|
|
pcie_cap_deverr_init(pci_dev);
|
|
}
|
|
|
|
if (proxy->flags & VIRTIO_PCI_FLAG_INIT_LNKCTL) {
|
|
/* Init Link Control Register */
|
|
pcie_cap_lnkctl_init(pci_dev);
|
|
}
|
|
|
|
if (proxy->flags & VIRTIO_PCI_FLAG_INIT_PM) {
|
|
/* Init Power Management Control Register */
|
|
pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL,
|
|
PCI_PM_CTRL_STATE_MASK);
|
|
}
|
|
|
|
if (proxy->flags & VIRTIO_PCI_FLAG_ATS) {
|
|
pcie_ats_init(pci_dev, last_pcie_cap_offset,
|
|
proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED);
|
|
last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF;
|
|
}
|
|
|
|
if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
|
|
/* Set Function Level Reset capability bit */
|
|
pcie_cap_flr_init(pci_dev);
|
|
}
|
|
} else {
|
|
/*
|
|
* make future invocations of pci_is_express() return false
|
|
* and pci_config_size() return PCI_CONFIG_SPACE_SIZE.
|
|
*/
|
|
pci_dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS;
|
|
}
|
|
|
|
virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy);
|
|
if (k->realize) {
|
|
k->realize(proxy, errp);
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_exit(PCIDevice *pci_dev)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
|
|
bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) &&
|
|
!pci_bus_is_root(pci_get_bus(pci_dev));
|
|
|
|
msix_uninit_exclusive_bar(pci_dev);
|
|
if (proxy->flags & VIRTIO_PCI_FLAG_AER && pcie_port &&
|
|
pci_is_express(pci_dev)) {
|
|
pcie_aer_exit(pci_dev);
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_reset(DeviceState *qdev)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
|
|
VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
|
|
int i;
|
|
|
|
virtio_bus_reset(bus);
|
|
msix_unuse_all_vectors(&proxy->pci_dev);
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
proxy->vqs[i].enabled = 0;
|
|
proxy->vqs[i].reset = 0;
|
|
proxy->vqs[i].num = 0;
|
|
proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0;
|
|
proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0;
|
|
proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0;
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_bus_reset(DeviceState *qdev)
|
|
{
|
|
PCIDevice *dev = PCI_DEVICE(qdev);
|
|
|
|
virtio_pci_reset(qdev);
|
|
|
|
if (pci_is_express(dev)) {
|
|
pcie_cap_deverr_reset(dev);
|
|
pcie_cap_lnkctl_reset(dev);
|
|
|
|
pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0);
|
|
}
|
|
}
|
|
|
|
static Property virtio_pci_properties[] = {
|
|
DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false),
|
|
DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true),
|
|
DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT, false),
|
|
DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT, false),
|
|
DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false),
|
|
DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy,
|
|
ignore_backend_features, false),
|
|
DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_ATS_BIT, false),
|
|
DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true),
|
|
DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true),
|
|
DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true),
|
|
DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_INIT_PM_BIT, true),
|
|
DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_INIT_FLR_BIT, true),
|
|
DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags,
|
|
VIRTIO_PCI_FLAG_AER_BIT, false),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp)
|
|
{
|
|
VirtioPCIClass *vpciklass = VIRTIO_PCI_GET_CLASS(qdev);
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
|
|
PCIDevice *pci_dev = &proxy->pci_dev;
|
|
|
|
if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
|
|
virtio_pci_modern(proxy)) {
|
|
pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
|
|
}
|
|
|
|
vpciklass->parent_dc_realize(qdev, errp);
|
|
}
|
|
|
|
static void virtio_pci_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
|
|
VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass);
|
|
|
|
device_class_set_props(dc, virtio_pci_properties);
|
|
k->realize = virtio_pci_realize;
|
|
k->exit = virtio_pci_exit;
|
|
k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
|
|
k->revision = VIRTIO_PCI_ABI_VERSION;
|
|
k->class_id = PCI_CLASS_OTHERS;
|
|
device_class_set_parent_realize(dc, virtio_pci_dc_realize,
|
|
&vpciklass->parent_dc_realize);
|
|
dc->reset = virtio_pci_bus_reset;
|
|
}
|
|
|
|
static const TypeInfo virtio_pci_info = {
|
|
.name = TYPE_VIRTIO_PCI,
|
|
.parent = TYPE_PCI_DEVICE,
|
|
.instance_size = sizeof(VirtIOPCIProxy),
|
|
.class_init = virtio_pci_class_init,
|
|
.class_size = sizeof(VirtioPCIClass),
|
|
.abstract = true,
|
|
};
|
|
|
|
static Property virtio_pci_generic_properties[] = {
|
|
DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy,
|
|
ON_OFF_AUTO_AUTO),
|
|
DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void virtio_pci_base_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
const VirtioPCIDeviceTypeInfo *t = data;
|
|
if (t->class_init) {
|
|
t->class_init(klass, NULL);
|
|
}
|
|
}
|
|
|
|
static void virtio_pci_generic_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
device_class_set_props(dc, virtio_pci_generic_properties);
|
|
}
|
|
|
|
static void virtio_pci_transitional_instance_init(Object *obj)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(obj);
|
|
|
|
proxy->disable_legacy = ON_OFF_AUTO_OFF;
|
|
proxy->disable_modern = false;
|
|
}
|
|
|
|
static void virtio_pci_non_transitional_instance_init(Object *obj)
|
|
{
|
|
VirtIOPCIProxy *proxy = VIRTIO_PCI(obj);
|
|
|
|
proxy->disable_legacy = ON_OFF_AUTO_ON;
|
|
proxy->disable_modern = false;
|
|
}
|
|
|
|
void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t)
|
|
{
|
|
char *base_name = NULL;
|
|
TypeInfo base_type_info = {
|
|
.name = t->base_name,
|
|
.parent = t->parent ? t->parent : TYPE_VIRTIO_PCI,
|
|
.instance_size = t->instance_size,
|
|
.instance_init = t->instance_init,
|
|
.class_size = t->class_size,
|
|
.abstract = true,
|
|
.interfaces = t->interfaces,
|
|
};
|
|
TypeInfo generic_type_info = {
|
|
.name = t->generic_name,
|
|
.parent = base_type_info.name,
|
|
.class_init = virtio_pci_generic_class_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ INTERFACE_PCIE_DEVICE },
|
|
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
|
|
{ }
|
|
},
|
|
};
|
|
|
|
if (!base_type_info.name) {
|
|
/* No base type -> register a single generic device type */
|
|
/* use intermediate %s-base-type to add generic device props */
|
|
base_name = g_strdup_printf("%s-base-type", t->generic_name);
|
|
base_type_info.name = base_name;
|
|
base_type_info.class_init = virtio_pci_generic_class_init;
|
|
|
|
generic_type_info.parent = base_name;
|
|
generic_type_info.class_init = virtio_pci_base_class_init;
|
|
generic_type_info.class_data = (void *)t;
|
|
|
|
assert(!t->non_transitional_name);
|
|
assert(!t->transitional_name);
|
|
} else {
|
|
base_type_info.class_init = virtio_pci_base_class_init;
|
|
base_type_info.class_data = (void *)t;
|
|
}
|
|
|
|
type_register(&base_type_info);
|
|
if (generic_type_info.name) {
|
|
type_register(&generic_type_info);
|
|
}
|
|
|
|
if (t->non_transitional_name) {
|
|
const TypeInfo non_transitional_type_info = {
|
|
.name = t->non_transitional_name,
|
|
.parent = base_type_info.name,
|
|
.instance_init = virtio_pci_non_transitional_instance_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ INTERFACE_PCIE_DEVICE },
|
|
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
|
|
{ }
|
|
},
|
|
};
|
|
type_register(&non_transitional_type_info);
|
|
}
|
|
|
|
if (t->transitional_name) {
|
|
const TypeInfo transitional_type_info = {
|
|
.name = t->transitional_name,
|
|
.parent = base_type_info.name,
|
|
.instance_init = virtio_pci_transitional_instance_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
/*
|
|
* Transitional virtio devices work only as Conventional PCI
|
|
* devices because they require PIO ports.
|
|
*/
|
|
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
|
|
{ }
|
|
},
|
|
};
|
|
type_register(&transitional_type_info);
|
|
}
|
|
g_free(base_name);
|
|
}
|
|
|
|
unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues)
|
|
{
|
|
/*
|
|
* 1:1 vq to vCPU mapping is ideal because the same vCPU that submitted
|
|
* virtqueue buffers can handle their completion. When a different vCPU
|
|
* handles completion it may need to IPI the vCPU that submitted the
|
|
* request and this adds overhead.
|
|
*
|
|
* Virtqueues consume guest RAM and MSI-X vectors. This is wasteful in
|
|
* guests with very many vCPUs and a device that is only used by a few
|
|
* vCPUs. Unfortunately optimizing that case requires manual pinning inside
|
|
* the guest, so those users might as well manually set the number of
|
|
* queues. There is no upper limit that can be applied automatically and
|
|
* doing so arbitrarily would result in a sudden performance drop once the
|
|
* threshold number of vCPUs is exceeded.
|
|
*/
|
|
unsigned num_queues = current_machine->smp.cpus;
|
|
|
|
/*
|
|
* The maximum number of MSI-X vectors is PCI_MSIX_FLAGS_QSIZE + 1, but the
|
|
* config change interrupt and the fixed virtqueues must be taken into
|
|
* account too.
|
|
*/
|
|
num_queues = MIN(num_queues, PCI_MSIX_FLAGS_QSIZE - fixed_queues);
|
|
|
|
/*
|
|
* There is a limit to how many virtqueues a device can have.
|
|
*/
|
|
return MIN(num_queues, VIRTIO_QUEUE_MAX - fixed_queues);
|
|
}
|
|
|
|
/* virtio-pci-bus */
|
|
|
|
static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
|
|
VirtIOPCIProxy *dev)
|
|
{
|
|
DeviceState *qdev = DEVICE(dev);
|
|
char virtio_bus_name[] = "virtio-bus";
|
|
|
|
qbus_init(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev, virtio_bus_name);
|
|
}
|
|
|
|
static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
BusClass *bus_class = BUS_CLASS(klass);
|
|
VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
|
|
bus_class->max_dev = 1;
|
|
k->notify = virtio_pci_notify;
|
|
k->save_config = virtio_pci_save_config;
|
|
k->load_config = virtio_pci_load_config;
|
|
k->save_queue = virtio_pci_save_queue;
|
|
k->load_queue = virtio_pci_load_queue;
|
|
k->save_extra_state = virtio_pci_save_extra_state;
|
|
k->load_extra_state = virtio_pci_load_extra_state;
|
|
k->has_extra_state = virtio_pci_has_extra_state;
|
|
k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
|
|
k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
|
|
k->set_host_notifier_mr = virtio_pci_set_host_notifier_mr;
|
|
k->vmstate_change = virtio_pci_vmstate_change;
|
|
k->pre_plugged = virtio_pci_pre_plugged;
|
|
k->device_plugged = virtio_pci_device_plugged;
|
|
k->device_unplugged = virtio_pci_device_unplugged;
|
|
k->query_nvectors = virtio_pci_query_nvectors;
|
|
k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled;
|
|
k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
|
|
k->get_dma_as = virtio_pci_get_dma_as;
|
|
k->iommu_enabled = virtio_pci_iommu_enabled;
|
|
k->queue_enabled = virtio_pci_queue_enabled;
|
|
}
|
|
|
|
static const TypeInfo virtio_pci_bus_info = {
|
|
.name = TYPE_VIRTIO_PCI_BUS,
|
|
.parent = TYPE_VIRTIO_BUS,
|
|
.instance_size = sizeof(VirtioPCIBusState),
|
|
.class_size = sizeof(VirtioPCIBusClass),
|
|
.class_init = virtio_pci_bus_class_init,
|
|
};
|
|
|
|
static void virtio_pci_register_types(void)
|
|
{
|
|
/* Base types: */
|
|
type_register_static(&virtio_pci_bus_info);
|
|
type_register_static(&virtio_pci_info);
|
|
}
|
|
|
|
type_init(virtio_pci_register_types)
|
|
|