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1574 lines
51 KiB
C
1574 lines
51 KiB
C
/*
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* generic functions used by VFIO devices
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*
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* Copyright Red Hat, Inc. 2012
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*
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* Authors:
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* Alex Williamson <alex.williamson@redhat.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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* Based on qemu-kvm device-assignment:
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* Adapted for KVM by Qumranet.
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* Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
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* Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
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* Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
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* Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
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* Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
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*/
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#include "qemu/osdep.h"
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#include <sys/ioctl.h>
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#ifdef CONFIG_KVM
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#include <linux/kvm.h>
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#endif
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#include <linux/vfio.h>
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#include "hw/vfio/vfio-common.h"
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#include "hw/vfio/pci.h"
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#include "exec/address-spaces.h"
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#include "exec/memory.h"
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#include "exec/ram_addr.h"
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#include "hw/hw.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "qemu/range.h"
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#include "sysemu/kvm.h"
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#include "sysemu/reset.h"
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#include "sysemu/runstate.h"
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#include "trace.h"
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#include "qapi/error.h"
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#include "migration/misc.h"
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#include "migration/blocker.h"
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#include "migration/qemu-file.h"
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#include "sysemu/tpm.h"
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VFIODeviceList vfio_device_list =
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QLIST_HEAD_INITIALIZER(vfio_device_list);
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static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
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QLIST_HEAD_INITIALIZER(vfio_address_spaces);
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#ifdef CONFIG_KVM
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/*
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* We have a single VFIO pseudo device per KVM VM. Once created it lives
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* for the life of the VM. Closing the file descriptor only drops our
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* reference to it and the device's reference to kvm. Therefore once
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* initialized, this file descriptor is only released on QEMU exit and
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* we'll re-use it should another vfio device be attached before then.
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*/
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int vfio_kvm_device_fd = -1;
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#endif
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/*
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* Device state interfaces
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*/
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bool vfio_mig_active(void)
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{
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VFIODevice *vbasedev;
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if (QLIST_EMPTY(&vfio_device_list)) {
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return false;
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}
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QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
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if (vbasedev->migration_blocker) {
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return false;
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}
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}
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return true;
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}
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static Error *multiple_devices_migration_blocker;
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/*
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* Multiple devices migration is allowed only if all devices support P2P
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* migration. Single device migration is allowed regardless of P2P migration
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* support.
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*/
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static bool vfio_multiple_devices_migration_is_supported(void)
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{
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VFIODevice *vbasedev;
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unsigned int device_num = 0;
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bool all_support_p2p = true;
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QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
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if (vbasedev->migration) {
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device_num++;
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if (!(vbasedev->migration->mig_flags & VFIO_MIGRATION_P2P)) {
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all_support_p2p = false;
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}
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}
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}
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return all_support_p2p || device_num <= 1;
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}
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int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp)
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{
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int ret;
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if (vfio_multiple_devices_migration_is_supported()) {
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return 0;
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}
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if (vbasedev->enable_migration == ON_OFF_AUTO_ON) {
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error_setg(errp, "Multiple VFIO devices migration is supported only if "
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"all of them support P2P migration");
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return -EINVAL;
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}
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if (multiple_devices_migration_blocker) {
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return 0;
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}
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error_setg(&multiple_devices_migration_blocker,
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"Multiple VFIO devices migration is supported only if all of "
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"them support P2P migration");
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ret = migrate_add_blocker_normal(&multiple_devices_migration_blocker, errp);
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return ret;
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}
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void vfio_unblock_multiple_devices_migration(void)
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{
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if (!multiple_devices_migration_blocker ||
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!vfio_multiple_devices_migration_is_supported()) {
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return;
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}
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migrate_del_blocker(&multiple_devices_migration_blocker);
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}
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bool vfio_viommu_preset(VFIODevice *vbasedev)
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{
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return vbasedev->bcontainer->space->as != &address_space_memory;
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}
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static void vfio_set_migration_error(int ret)
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{
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if (migration_is_running()) {
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migration_file_set_error(ret, NULL);
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}
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}
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bool vfio_device_state_is_running(VFIODevice *vbasedev)
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{
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VFIOMigration *migration = vbasedev->migration;
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return migration->device_state == VFIO_DEVICE_STATE_RUNNING ||
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migration->device_state == VFIO_DEVICE_STATE_RUNNING_P2P;
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}
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bool vfio_device_state_is_precopy(VFIODevice *vbasedev)
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{
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VFIOMigration *migration = vbasedev->migration;
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return migration->device_state == VFIO_DEVICE_STATE_PRE_COPY ||
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migration->device_state == VFIO_DEVICE_STATE_PRE_COPY_P2P;
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}
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static bool vfio_devices_all_dirty_tracking(VFIOContainerBase *bcontainer)
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{
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VFIODevice *vbasedev;
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if (!migration_is_active() && !migration_is_device()) {
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return false;
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}
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QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
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VFIOMigration *migration = vbasedev->migration;
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if (!migration) {
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return false;
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}
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if (vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF &&
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(vfio_device_state_is_running(vbasedev) ||
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vfio_device_state_is_precopy(vbasedev))) {
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return false;
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}
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}
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return true;
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}
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bool vfio_devices_all_device_dirty_tracking(const VFIOContainerBase *bcontainer)
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{
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VFIODevice *vbasedev;
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QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
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if (vbasedev->device_dirty_page_tracking == ON_OFF_AUTO_OFF) {
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return false;
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}
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if (!vbasedev->dirty_pages_supported) {
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return false;
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}
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}
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return true;
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}
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/*
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* Check if all VFIO devices are running and migration is active, which is
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* essentially equivalent to the migration being in pre-copy phase.
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*/
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bool
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vfio_devices_all_running_and_mig_active(const VFIOContainerBase *bcontainer)
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{
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VFIODevice *vbasedev;
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if (!migration_is_active()) {
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return false;
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}
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QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
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VFIOMigration *migration = vbasedev->migration;
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if (!migration) {
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return false;
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}
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if (vfio_device_state_is_running(vbasedev) ||
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vfio_device_state_is_precopy(vbasedev)) {
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continue;
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} else {
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return false;
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}
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}
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return true;
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}
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static bool vfio_listener_skipped_section(MemoryRegionSection *section)
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{
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return (!memory_region_is_ram(section->mr) &&
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!memory_region_is_iommu(section->mr)) ||
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memory_region_is_protected(section->mr) ||
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/*
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* Sizing an enabled 64-bit BAR can cause spurious mappings to
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* addresses in the upper part of the 64-bit address space. These
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* are never accessed by the CPU and beyond the address width of
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* some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
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*/
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section->offset_within_address_space & (1ULL << 63);
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}
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/* Called with rcu_read_lock held. */
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static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr,
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ram_addr_t *ram_addr, bool *read_only,
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Error **errp)
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{
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bool ret, mr_has_discard_manager;
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ret = memory_get_xlat_addr(iotlb, vaddr, ram_addr, read_only,
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&mr_has_discard_manager, errp);
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if (ret && mr_has_discard_manager) {
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/*
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* Malicious VMs might trigger discarding of IOMMU-mapped memory. The
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* pages will remain pinned inside vfio until unmapped, resulting in a
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* higher memory consumption than expected. If memory would get
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* populated again later, there would be an inconsistency between pages
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* pinned by vfio and pages seen by QEMU. This is the case until
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* unmapped from the IOMMU (e.g., during device reset).
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*
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* With malicious guests, we really only care about pinning more memory
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* than expected. RLIMIT_MEMLOCK set for the user/process can never be
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* exceeded and can be used to mitigate this problem.
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*/
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warn_report_once("Using vfio with vIOMMUs and coordinated discarding of"
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" RAM (e.g., virtio-mem) works, however, malicious"
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" guests can trigger pinning of more memory than"
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" intended via an IOMMU. It's possible to mitigate "
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" by setting/adjusting RLIMIT_MEMLOCK.");
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}
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return ret;
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}
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static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
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{
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VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
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VFIOContainerBase *bcontainer = giommu->bcontainer;
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hwaddr iova = iotlb->iova + giommu->iommu_offset;
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void *vaddr;
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int ret;
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Error *local_err = NULL;
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trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP",
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iova, iova + iotlb->addr_mask);
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if (iotlb->target_as != &address_space_memory) {
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error_report("Wrong target AS \"%s\", only system memory is allowed",
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iotlb->target_as->name ? iotlb->target_as->name : "none");
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vfio_set_migration_error(-EINVAL);
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return;
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}
|
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|
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rcu_read_lock();
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|
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if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
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bool read_only;
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if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only, &local_err)) {
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error_report_err(local_err);
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goto out;
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}
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/*
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* vaddr is only valid until rcu_read_unlock(). But after
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* vfio_dma_map has set up the mapping the pages will be
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* pinned by the kernel. This makes sure that the RAM backend
|
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* of vaddr will always be there, even if the memory object is
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* destroyed and its backing memory munmap-ed.
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*/
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ret = vfio_container_dma_map(bcontainer, iova,
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iotlb->addr_mask + 1, vaddr,
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read_only);
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if (ret) {
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error_report("vfio_container_dma_map(%p, 0x%"HWADDR_PRIx", "
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"0x%"HWADDR_PRIx", %p) = %d (%s)",
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bcontainer, iova,
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iotlb->addr_mask + 1, vaddr, ret, strerror(-ret));
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}
|
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} else {
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ret = vfio_container_dma_unmap(bcontainer, iova,
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iotlb->addr_mask + 1, iotlb);
|
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if (ret) {
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error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx", "
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"0x%"HWADDR_PRIx") = %d (%s)",
|
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bcontainer, iova,
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iotlb->addr_mask + 1, ret, strerror(-ret));
|
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vfio_set_migration_error(ret);
|
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}
|
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}
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out:
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rcu_read_unlock();
|
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}
|
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|
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static void vfio_ram_discard_notify_discard(RamDiscardListener *rdl,
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MemoryRegionSection *section)
|
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{
|
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VFIORamDiscardListener *vrdl = container_of(rdl, VFIORamDiscardListener,
|
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listener);
|
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VFIOContainerBase *bcontainer = vrdl->bcontainer;
|
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const hwaddr size = int128_get64(section->size);
|
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const hwaddr iova = section->offset_within_address_space;
|
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int ret;
|
|
|
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/* Unmap with a single call. */
|
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ret = vfio_container_dma_unmap(bcontainer, iova, size , NULL);
|
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if (ret) {
|
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error_report("%s: vfio_container_dma_unmap() failed: %s", __func__,
|
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strerror(-ret));
|
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}
|
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}
|
|
|
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static int vfio_ram_discard_notify_populate(RamDiscardListener *rdl,
|
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MemoryRegionSection *section)
|
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{
|
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VFIORamDiscardListener *vrdl = container_of(rdl, VFIORamDiscardListener,
|
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listener);
|
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VFIOContainerBase *bcontainer = vrdl->bcontainer;
|
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const hwaddr end = section->offset_within_region +
|
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int128_get64(section->size);
|
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hwaddr start, next, iova;
|
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void *vaddr;
|
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int ret;
|
|
|
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/*
|
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* Map in (aligned within memory region) minimum granularity, so we can
|
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* unmap in minimum granularity later.
|
|
*/
|
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for (start = section->offset_within_region; start < end; start = next) {
|
|
next = ROUND_UP(start + 1, vrdl->granularity);
|
|
next = MIN(next, end);
|
|
|
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iova = start - section->offset_within_region +
|
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section->offset_within_address_space;
|
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vaddr = memory_region_get_ram_ptr(section->mr) + start;
|
|
|
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ret = vfio_container_dma_map(bcontainer, iova, next - start,
|
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vaddr, section->readonly);
|
|
if (ret) {
|
|
/* Rollback */
|
|
vfio_ram_discard_notify_discard(rdl, section);
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void vfio_register_ram_discard_listener(VFIOContainerBase *bcontainer,
|
|
MemoryRegionSection *section)
|
|
{
|
|
RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr);
|
|
VFIORamDiscardListener *vrdl;
|
|
|
|
/* Ignore some corner cases not relevant in practice. */
|
|
g_assert(QEMU_IS_ALIGNED(section->offset_within_region, TARGET_PAGE_SIZE));
|
|
g_assert(QEMU_IS_ALIGNED(section->offset_within_address_space,
|
|
TARGET_PAGE_SIZE));
|
|
g_assert(QEMU_IS_ALIGNED(int128_get64(section->size), TARGET_PAGE_SIZE));
|
|
|
|
vrdl = g_new0(VFIORamDiscardListener, 1);
|
|
vrdl->bcontainer = bcontainer;
|
|
vrdl->mr = section->mr;
|
|
vrdl->offset_within_address_space = section->offset_within_address_space;
|
|
vrdl->size = int128_get64(section->size);
|
|
vrdl->granularity = ram_discard_manager_get_min_granularity(rdm,
|
|
section->mr);
|
|
|
|
g_assert(vrdl->granularity && is_power_of_2(vrdl->granularity));
|
|
g_assert(bcontainer->pgsizes &&
|
|
vrdl->granularity >= 1ULL << ctz64(bcontainer->pgsizes));
|
|
|
|
ram_discard_listener_init(&vrdl->listener,
|
|
vfio_ram_discard_notify_populate,
|
|
vfio_ram_discard_notify_discard, true);
|
|
ram_discard_manager_register_listener(rdm, &vrdl->listener, section);
|
|
QLIST_INSERT_HEAD(&bcontainer->vrdl_list, vrdl, next);
|
|
|
|
/*
|
|
* Sanity-check if we have a theoretically problematic setup where we could
|
|
* exceed the maximum number of possible DMA mappings over time. We assume
|
|
* that each mapped section in the same address space as a RamDiscardManager
|
|
* section consumes exactly one DMA mapping, with the exception of
|
|
* RamDiscardManager sections; i.e., we don't expect to have gIOMMU sections
|
|
* in the same address space as RamDiscardManager sections.
|
|
*
|
|
* We assume that each section in the address space consumes one memslot.
|
|
* We take the number of KVM memory slots as a best guess for the maximum
|
|
* number of sections in the address space we could have over time,
|
|
* also consuming DMA mappings.
|
|
*/
|
|
if (bcontainer->dma_max_mappings) {
|
|
unsigned int vrdl_count = 0, vrdl_mappings = 0, max_memslots = 512;
|
|
|
|
#ifdef CONFIG_KVM
|
|
if (kvm_enabled()) {
|
|
max_memslots = kvm_get_max_memslots();
|
|
}
|
|
#endif
|
|
|
|
QLIST_FOREACH(vrdl, &bcontainer->vrdl_list, next) {
|
|
hwaddr start, end;
|
|
|
|
start = QEMU_ALIGN_DOWN(vrdl->offset_within_address_space,
|
|
vrdl->granularity);
|
|
end = ROUND_UP(vrdl->offset_within_address_space + vrdl->size,
|
|
vrdl->granularity);
|
|
vrdl_mappings += (end - start) / vrdl->granularity;
|
|
vrdl_count++;
|
|
}
|
|
|
|
if (vrdl_mappings + max_memslots - vrdl_count >
|
|
bcontainer->dma_max_mappings) {
|
|
warn_report("%s: possibly running out of DMA mappings. E.g., try"
|
|
" increasing the 'block-size' of virtio-mem devies."
|
|
" Maximum possible DMA mappings: %d, Maximum possible"
|
|
" memslots: %d", __func__, bcontainer->dma_max_mappings,
|
|
max_memslots);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void vfio_unregister_ram_discard_listener(VFIOContainerBase *bcontainer,
|
|
MemoryRegionSection *section)
|
|
{
|
|
RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr);
|
|
VFIORamDiscardListener *vrdl = NULL;
|
|
|
|
QLIST_FOREACH(vrdl, &bcontainer->vrdl_list, next) {
|
|
if (vrdl->mr == section->mr &&
|
|
vrdl->offset_within_address_space ==
|
|
section->offset_within_address_space) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!vrdl) {
|
|
hw_error("vfio: Trying to unregister missing RAM discard listener");
|
|
}
|
|
|
|
ram_discard_manager_unregister_listener(rdm, &vrdl->listener);
|
|
QLIST_REMOVE(vrdl, next);
|
|
g_free(vrdl);
|
|
}
|
|
|
|
static bool vfio_known_safe_misalignment(MemoryRegionSection *section)
|
|
{
|
|
MemoryRegion *mr = section->mr;
|
|
|
|
if (!TPM_IS_CRB(mr->owner)) {
|
|
return false;
|
|
}
|
|
|
|
/* this is a known safe misaligned region, just trace for debug purpose */
|
|
trace_vfio_known_safe_misalignment(memory_region_name(mr),
|
|
section->offset_within_address_space,
|
|
section->offset_within_region,
|
|
qemu_real_host_page_size());
|
|
return true;
|
|
}
|
|
|
|
static bool vfio_listener_valid_section(MemoryRegionSection *section,
|
|
const char *name)
|
|
{
|
|
if (vfio_listener_skipped_section(section)) {
|
|
trace_vfio_listener_region_skip(name,
|
|
section->offset_within_address_space,
|
|
section->offset_within_address_space +
|
|
int128_get64(int128_sub(section->size, int128_one())));
|
|
return false;
|
|
}
|
|
|
|
if (unlikely((section->offset_within_address_space &
|
|
~qemu_real_host_page_mask()) !=
|
|
(section->offset_within_region & ~qemu_real_host_page_mask()))) {
|
|
if (!vfio_known_safe_misalignment(section)) {
|
|
error_report("%s received unaligned region %s iova=0x%"PRIx64
|
|
" offset_within_region=0x%"PRIx64
|
|
" qemu_real_host_page_size=0x%"PRIxPTR,
|
|
__func__, memory_region_name(section->mr),
|
|
section->offset_within_address_space,
|
|
section->offset_within_region,
|
|
qemu_real_host_page_size());
|
|
}
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool vfio_get_section_iova_range(VFIOContainerBase *bcontainer,
|
|
MemoryRegionSection *section,
|
|
hwaddr *out_iova, hwaddr *out_end,
|
|
Int128 *out_llend)
|
|
{
|
|
Int128 llend;
|
|
hwaddr iova;
|
|
|
|
iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space);
|
|
llend = int128_make64(section->offset_within_address_space);
|
|
llend = int128_add(llend, section->size);
|
|
llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask()));
|
|
|
|
if (int128_ge(int128_make64(iova), llend)) {
|
|
return false;
|
|
}
|
|
|
|
*out_iova = iova;
|
|
*out_end = int128_get64(int128_sub(llend, int128_one()));
|
|
if (out_llend) {
|
|
*out_llend = llend;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void vfio_listener_region_add(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
|
|
listener);
|
|
hwaddr iova, end;
|
|
Int128 llend, llsize;
|
|
void *vaddr;
|
|
int ret;
|
|
Error *err = NULL;
|
|
|
|
if (!vfio_listener_valid_section(section, "region_add")) {
|
|
return;
|
|
}
|
|
|
|
if (!vfio_get_section_iova_range(bcontainer, section, &iova, &end,
|
|
&llend)) {
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
trace_vfio_listener_region_add_no_dma_map(
|
|
memory_region_name(section->mr),
|
|
section->offset_within_address_space,
|
|
int128_getlo(section->size),
|
|
qemu_real_host_page_size());
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (!vfio_container_add_section_window(bcontainer, section, &err)) {
|
|
goto fail;
|
|
}
|
|
|
|
memory_region_ref(section->mr);
|
|
|
|
if (memory_region_is_iommu(section->mr)) {
|
|
VFIOGuestIOMMU *giommu;
|
|
IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
|
|
int iommu_idx;
|
|
|
|
trace_vfio_listener_region_add_iommu(section->mr->name, iova, end);
|
|
/*
|
|
* FIXME: For VFIO iommu types which have KVM acceleration to
|
|
* avoid bouncing all map/unmaps through qemu this way, this
|
|
* would be the right place to wire that up (tell the KVM
|
|
* device emulation the VFIO iommu handles to use).
|
|
*/
|
|
giommu = g_malloc0(sizeof(*giommu));
|
|
giommu->iommu_mr = iommu_mr;
|
|
giommu->iommu_offset = section->offset_within_address_space -
|
|
section->offset_within_region;
|
|
giommu->bcontainer = bcontainer;
|
|
llend = int128_add(int128_make64(section->offset_within_region),
|
|
section->size);
|
|
llend = int128_sub(llend, int128_one());
|
|
iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
iommu_notifier_init(&giommu->n, vfio_iommu_map_notify,
|
|
IOMMU_NOTIFIER_IOTLB_EVENTS,
|
|
section->offset_within_region,
|
|
int128_get64(llend),
|
|
iommu_idx);
|
|
|
|
ret = memory_region_register_iommu_notifier(section->mr, &giommu->n,
|
|
&err);
|
|
if (ret) {
|
|
g_free(giommu);
|
|
goto fail;
|
|
}
|
|
QLIST_INSERT_HEAD(&bcontainer->giommu_list, giommu, giommu_next);
|
|
memory_region_iommu_replay(giommu->iommu_mr, &giommu->n);
|
|
|
|
return;
|
|
}
|
|
|
|
/* Here we assume that memory_region_is_ram(section->mr)==true */
|
|
|
|
/*
|
|
* For RAM memory regions with a RamDiscardManager, we only want to map the
|
|
* actually populated parts - and update the mapping whenever we're notified
|
|
* about changes.
|
|
*/
|
|
if (memory_region_has_ram_discard_manager(section->mr)) {
|
|
vfio_register_ram_discard_listener(bcontainer, section);
|
|
return;
|
|
}
|
|
|
|
vaddr = memory_region_get_ram_ptr(section->mr) +
|
|
section->offset_within_region +
|
|
(iova - section->offset_within_address_space);
|
|
|
|
trace_vfio_listener_region_add_ram(iova, end, vaddr);
|
|
|
|
llsize = int128_sub(llend, int128_make64(iova));
|
|
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
hwaddr pgmask = (1ULL << ctz64(bcontainer->pgsizes)) - 1;
|
|
|
|
if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) {
|
|
trace_vfio_listener_region_add_no_dma_map(
|
|
memory_region_name(section->mr),
|
|
section->offset_within_address_space,
|
|
int128_getlo(section->size),
|
|
pgmask + 1);
|
|
return;
|
|
}
|
|
}
|
|
|
|
ret = vfio_container_dma_map(bcontainer, iova, int128_get64(llsize),
|
|
vaddr, section->readonly);
|
|
if (ret) {
|
|
error_setg(&err, "vfio_container_dma_map(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx", %p) = %d (%s)",
|
|
bcontainer, iova, int128_get64(llsize), vaddr, ret,
|
|
strerror(-ret));
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
/* Allow unexpected mappings not to be fatal for RAM devices */
|
|
error_report_err(err);
|
|
return;
|
|
}
|
|
goto fail;
|
|
}
|
|
|
|
return;
|
|
|
|
fail:
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
error_reportf_err(err, "PCI p2p may not work: ");
|
|
return;
|
|
}
|
|
/*
|
|
* On the initfn path, store the first error in the container so we
|
|
* can gracefully fail. Runtime, there's not much we can do other
|
|
* than throw a hardware error.
|
|
*/
|
|
if (!bcontainer->initialized) {
|
|
if (!bcontainer->error) {
|
|
error_propagate_prepend(&bcontainer->error, err,
|
|
"Region %s: ",
|
|
memory_region_name(section->mr));
|
|
} else {
|
|
error_free(err);
|
|
}
|
|
} else {
|
|
error_report_err(err);
|
|
hw_error("vfio: DMA mapping failed, unable to continue");
|
|
}
|
|
}
|
|
|
|
static void vfio_listener_region_del(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
|
|
listener);
|
|
hwaddr iova, end;
|
|
Int128 llend, llsize;
|
|
int ret;
|
|
bool try_unmap = true;
|
|
|
|
if (!vfio_listener_valid_section(section, "region_del")) {
|
|
return;
|
|
}
|
|
|
|
if (memory_region_is_iommu(section->mr)) {
|
|
VFIOGuestIOMMU *giommu;
|
|
|
|
trace_vfio_listener_region_del_iommu(section->mr->name);
|
|
QLIST_FOREACH(giommu, &bcontainer->giommu_list, giommu_next) {
|
|
if (MEMORY_REGION(giommu->iommu_mr) == section->mr &&
|
|
giommu->n.start == section->offset_within_region) {
|
|
memory_region_unregister_iommu_notifier(section->mr,
|
|
&giommu->n);
|
|
QLIST_REMOVE(giommu, giommu_next);
|
|
g_free(giommu);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* FIXME: We assume the one big unmap below is adequate to
|
|
* remove any individual page mappings in the IOMMU which
|
|
* might have been copied into VFIO. This works for a page table
|
|
* based IOMMU where a big unmap flattens a large range of IO-PTEs.
|
|
* That may not be true for all IOMMU types.
|
|
*/
|
|
}
|
|
|
|
if (!vfio_get_section_iova_range(bcontainer, section, &iova, &end,
|
|
&llend)) {
|
|
return;
|
|
}
|
|
|
|
llsize = int128_sub(llend, int128_make64(iova));
|
|
|
|
trace_vfio_listener_region_del(iova, end);
|
|
|
|
if (memory_region_is_ram_device(section->mr)) {
|
|
hwaddr pgmask;
|
|
|
|
pgmask = (1ULL << ctz64(bcontainer->pgsizes)) - 1;
|
|
try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask));
|
|
} else if (memory_region_has_ram_discard_manager(section->mr)) {
|
|
vfio_unregister_ram_discard_listener(bcontainer, section);
|
|
/* Unregistering will trigger an unmap. */
|
|
try_unmap = false;
|
|
}
|
|
|
|
if (try_unmap) {
|
|
if (int128_eq(llsize, int128_2_64())) {
|
|
/* The unmap ioctl doesn't accept a full 64-bit span. */
|
|
llsize = int128_rshift(llsize, 1);
|
|
ret = vfio_container_dma_unmap(bcontainer, iova,
|
|
int128_get64(llsize), NULL);
|
|
if (ret) {
|
|
error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx") = %d (%s)",
|
|
bcontainer, iova, int128_get64(llsize), ret,
|
|
strerror(-ret));
|
|
}
|
|
iova += int128_get64(llsize);
|
|
}
|
|
ret = vfio_container_dma_unmap(bcontainer, iova,
|
|
int128_get64(llsize), NULL);
|
|
if (ret) {
|
|
error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx") = %d (%s)",
|
|
bcontainer, iova, int128_get64(llsize), ret,
|
|
strerror(-ret));
|
|
}
|
|
}
|
|
|
|
memory_region_unref(section->mr);
|
|
|
|
vfio_container_del_section_window(bcontainer, section);
|
|
}
|
|
|
|
typedef struct VFIODirtyRanges {
|
|
hwaddr min32;
|
|
hwaddr max32;
|
|
hwaddr min64;
|
|
hwaddr max64;
|
|
hwaddr minpci64;
|
|
hwaddr maxpci64;
|
|
} VFIODirtyRanges;
|
|
|
|
typedef struct VFIODirtyRangesListener {
|
|
VFIOContainerBase *bcontainer;
|
|
VFIODirtyRanges ranges;
|
|
MemoryListener listener;
|
|
} VFIODirtyRangesListener;
|
|
|
|
static bool vfio_section_is_vfio_pci(MemoryRegionSection *section,
|
|
VFIOContainerBase *bcontainer)
|
|
{
|
|
VFIOPCIDevice *pcidev;
|
|
VFIODevice *vbasedev;
|
|
Object *owner;
|
|
|
|
owner = memory_region_owner(section->mr);
|
|
|
|
QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
|
|
if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) {
|
|
continue;
|
|
}
|
|
pcidev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
|
|
if (OBJECT(pcidev) == owner) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void vfio_dirty_tracking_update_range(VFIODirtyRanges *range,
|
|
hwaddr iova, hwaddr end,
|
|
bool update_pci)
|
|
{
|
|
hwaddr *min, *max;
|
|
|
|
/*
|
|
* The address space passed to the dirty tracker is reduced to three ranges:
|
|
* one for 32-bit DMA ranges, one for 64-bit DMA ranges and one for the
|
|
* PCI 64-bit hole.
|
|
*
|
|
* The underlying reports of dirty will query a sub-interval of each of
|
|
* these ranges.
|
|
*
|
|
* The purpose of the three range handling is to handle known cases of big
|
|
* holes in the address space, like the x86 AMD 1T hole, and firmware (like
|
|
* OVMF) which may relocate the pci-hole64 to the end of the address space.
|
|
* The latter would otherwise generate large ranges for tracking, stressing
|
|
* the limits of supported hardware. The pci-hole32 will always be below 4G
|
|
* (overlapping or not) so it doesn't need special handling and is part of
|
|
* the 32-bit range.
|
|
*
|
|
* The alternative would be an IOVATree but that has a much bigger runtime
|
|
* overhead and unnecessary complexity.
|
|
*/
|
|
if (update_pci && iova >= UINT32_MAX) {
|
|
min = &range->minpci64;
|
|
max = &range->maxpci64;
|
|
} else {
|
|
min = (end <= UINT32_MAX) ? &range->min32 : &range->min64;
|
|
max = (end <= UINT32_MAX) ? &range->max32 : &range->max64;
|
|
}
|
|
if (*min > iova) {
|
|
*min = iova;
|
|
}
|
|
if (*max < end) {
|
|
*max = end;
|
|
}
|
|
|
|
trace_vfio_device_dirty_tracking_update(iova, end, *min, *max);
|
|
}
|
|
|
|
static void vfio_dirty_tracking_update(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIODirtyRangesListener *dirty =
|
|
container_of(listener, VFIODirtyRangesListener, listener);
|
|
hwaddr iova, end;
|
|
|
|
if (!vfio_listener_valid_section(section, "tracking_update") ||
|
|
!vfio_get_section_iova_range(dirty->bcontainer, section,
|
|
&iova, &end, NULL)) {
|
|
return;
|
|
}
|
|
|
|
vfio_dirty_tracking_update_range(&dirty->ranges, iova, end,
|
|
vfio_section_is_vfio_pci(section, dirty->bcontainer));
|
|
}
|
|
|
|
static const MemoryListener vfio_dirty_tracking_listener = {
|
|
.name = "vfio-tracking",
|
|
.region_add = vfio_dirty_tracking_update,
|
|
};
|
|
|
|
static void vfio_dirty_tracking_init(VFIOContainerBase *bcontainer,
|
|
VFIODirtyRanges *ranges)
|
|
{
|
|
VFIODirtyRangesListener dirty;
|
|
|
|
memset(&dirty, 0, sizeof(dirty));
|
|
dirty.ranges.min32 = UINT32_MAX;
|
|
dirty.ranges.min64 = UINT64_MAX;
|
|
dirty.ranges.minpci64 = UINT64_MAX;
|
|
dirty.listener = vfio_dirty_tracking_listener;
|
|
dirty.bcontainer = bcontainer;
|
|
|
|
memory_listener_register(&dirty.listener,
|
|
bcontainer->space->as);
|
|
|
|
*ranges = dirty.ranges;
|
|
|
|
/*
|
|
* The memory listener is synchronous, and used to calculate the range
|
|
* to dirty tracking. Unregister it after we are done as we are not
|
|
* interested in any follow-up updates.
|
|
*/
|
|
memory_listener_unregister(&dirty.listener);
|
|
}
|
|
|
|
static void vfio_devices_dma_logging_stop(VFIOContainerBase *bcontainer)
|
|
{
|
|
uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature),
|
|
sizeof(uint64_t))] = {};
|
|
struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
|
|
VFIODevice *vbasedev;
|
|
|
|
feature->argsz = sizeof(buf);
|
|
feature->flags = VFIO_DEVICE_FEATURE_SET |
|
|
VFIO_DEVICE_FEATURE_DMA_LOGGING_STOP;
|
|
|
|
QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
|
|
if (!vbasedev->dirty_tracking) {
|
|
continue;
|
|
}
|
|
|
|
if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
|
|
warn_report("%s: Failed to stop DMA logging, err %d (%s)",
|
|
vbasedev->name, -errno, strerror(errno));
|
|
}
|
|
vbasedev->dirty_tracking = false;
|
|
}
|
|
}
|
|
|
|
static struct vfio_device_feature *
|
|
vfio_device_feature_dma_logging_start_create(VFIOContainerBase *bcontainer,
|
|
VFIODirtyRanges *tracking)
|
|
{
|
|
struct vfio_device_feature *feature;
|
|
size_t feature_size;
|
|
struct vfio_device_feature_dma_logging_control *control;
|
|
struct vfio_device_feature_dma_logging_range *ranges;
|
|
|
|
feature_size = sizeof(struct vfio_device_feature) +
|
|
sizeof(struct vfio_device_feature_dma_logging_control);
|
|
feature = g_try_malloc0(feature_size);
|
|
if (!feature) {
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
feature->argsz = feature_size;
|
|
feature->flags = VFIO_DEVICE_FEATURE_SET |
|
|
VFIO_DEVICE_FEATURE_DMA_LOGGING_START;
|
|
|
|
control = (struct vfio_device_feature_dma_logging_control *)feature->data;
|
|
control->page_size = qemu_real_host_page_size();
|
|
|
|
/*
|
|
* DMA logging uAPI guarantees to support at least a number of ranges that
|
|
* fits into a single host kernel base page.
|
|
*/
|
|
control->num_ranges = !!tracking->max32 + !!tracking->max64 +
|
|
!!tracking->maxpci64;
|
|
ranges = g_try_new0(struct vfio_device_feature_dma_logging_range,
|
|
control->num_ranges);
|
|
if (!ranges) {
|
|
g_free(feature);
|
|
errno = ENOMEM;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
control->ranges = (uintptr_t)ranges;
|
|
if (tracking->max32) {
|
|
ranges->iova = tracking->min32;
|
|
ranges->length = (tracking->max32 - tracking->min32) + 1;
|
|
ranges++;
|
|
}
|
|
if (tracking->max64) {
|
|
ranges->iova = tracking->min64;
|
|
ranges->length = (tracking->max64 - tracking->min64) + 1;
|
|
ranges++;
|
|
}
|
|
if (tracking->maxpci64) {
|
|
ranges->iova = tracking->minpci64;
|
|
ranges->length = (tracking->maxpci64 - tracking->minpci64) + 1;
|
|
}
|
|
|
|
trace_vfio_device_dirty_tracking_start(control->num_ranges,
|
|
tracking->min32, tracking->max32,
|
|
tracking->min64, tracking->max64,
|
|
tracking->minpci64, tracking->maxpci64);
|
|
|
|
return feature;
|
|
}
|
|
|
|
static void vfio_device_feature_dma_logging_start_destroy(
|
|
struct vfio_device_feature *feature)
|
|
{
|
|
struct vfio_device_feature_dma_logging_control *control =
|
|
(struct vfio_device_feature_dma_logging_control *)feature->data;
|
|
struct vfio_device_feature_dma_logging_range *ranges =
|
|
(struct vfio_device_feature_dma_logging_range *)(uintptr_t)control->ranges;
|
|
|
|
g_free(ranges);
|
|
g_free(feature);
|
|
}
|
|
|
|
static bool vfio_devices_dma_logging_start(VFIOContainerBase *bcontainer,
|
|
Error **errp)
|
|
{
|
|
struct vfio_device_feature *feature;
|
|
VFIODirtyRanges ranges;
|
|
VFIODevice *vbasedev;
|
|
int ret = 0;
|
|
|
|
vfio_dirty_tracking_init(bcontainer, &ranges);
|
|
feature = vfio_device_feature_dma_logging_start_create(bcontainer,
|
|
&ranges);
|
|
if (!feature) {
|
|
error_setg_errno(errp, errno, "Failed to prepare DMA logging");
|
|
return false;
|
|
}
|
|
|
|
QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
|
|
if (vbasedev->dirty_tracking) {
|
|
continue;
|
|
}
|
|
|
|
ret = ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature);
|
|
if (ret) {
|
|
ret = -errno;
|
|
error_setg_errno(errp, errno, "%s: Failed to start DMA logging",
|
|
vbasedev->name);
|
|
goto out;
|
|
}
|
|
vbasedev->dirty_tracking = true;
|
|
}
|
|
|
|
out:
|
|
if (ret) {
|
|
vfio_devices_dma_logging_stop(bcontainer);
|
|
}
|
|
|
|
vfio_device_feature_dma_logging_start_destroy(feature);
|
|
|
|
return ret == 0;
|
|
}
|
|
|
|
static bool vfio_listener_log_global_start(MemoryListener *listener,
|
|
Error **errp)
|
|
{
|
|
ERRP_GUARD();
|
|
VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
|
|
listener);
|
|
bool ret;
|
|
|
|
if (vfio_devices_all_device_dirty_tracking(bcontainer)) {
|
|
ret = vfio_devices_dma_logging_start(bcontainer, errp);
|
|
} else {
|
|
ret = vfio_container_set_dirty_page_tracking(bcontainer, true, errp) == 0;
|
|
}
|
|
|
|
if (!ret) {
|
|
error_prepend(errp, "vfio: Could not start dirty page tracking - ");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void vfio_listener_log_global_stop(MemoryListener *listener)
|
|
{
|
|
VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
|
|
listener);
|
|
Error *local_err = NULL;
|
|
int ret = 0;
|
|
|
|
if (vfio_devices_all_device_dirty_tracking(bcontainer)) {
|
|
vfio_devices_dma_logging_stop(bcontainer);
|
|
} else {
|
|
ret = vfio_container_set_dirty_page_tracking(bcontainer, false,
|
|
&local_err);
|
|
}
|
|
|
|
if (ret) {
|
|
error_prepend(&local_err,
|
|
"vfio: Could not stop dirty page tracking - ");
|
|
error_report_err(local_err);
|
|
vfio_set_migration_error(ret);
|
|
}
|
|
}
|
|
|
|
static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
|
|
hwaddr size, void *bitmap)
|
|
{
|
|
uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
|
|
sizeof(struct vfio_device_feature_dma_logging_report),
|
|
sizeof(uint64_t))] = {};
|
|
struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
|
|
struct vfio_device_feature_dma_logging_report *report =
|
|
(struct vfio_device_feature_dma_logging_report *)feature->data;
|
|
|
|
report->iova = iova;
|
|
report->length = size;
|
|
report->page_size = qemu_real_host_page_size();
|
|
report->bitmap = (uintptr_t)bitmap;
|
|
|
|
feature->argsz = sizeof(buf);
|
|
feature->flags = VFIO_DEVICE_FEATURE_GET |
|
|
VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT;
|
|
|
|
if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
|
|
VFIOBitmap *vbmap, hwaddr iova, hwaddr size, Error **errp)
|
|
{
|
|
VFIODevice *vbasedev;
|
|
int ret;
|
|
|
|
QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
|
|
ret = vfio_device_dma_logging_report(vbasedev, iova, size,
|
|
vbmap->bitmap);
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret,
|
|
"%s: Failed to get DMA logging report, iova: "
|
|
"0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx,
|
|
vbasedev->name, iova, size);
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
|
|
uint64_t size, ram_addr_t ram_addr, Error **errp)
|
|
{
|
|
bool all_device_dirty_tracking =
|
|
vfio_devices_all_device_dirty_tracking(bcontainer);
|
|
uint64_t dirty_pages;
|
|
VFIOBitmap vbmap;
|
|
int ret;
|
|
|
|
if (!bcontainer->dirty_pages_supported && !all_device_dirty_tracking) {
|
|
cpu_physical_memory_set_dirty_range(ram_addr, size,
|
|
tcg_enabled() ? DIRTY_CLIENTS_ALL :
|
|
DIRTY_CLIENTS_NOCODE);
|
|
return 0;
|
|
}
|
|
|
|
ret = vfio_bitmap_alloc(&vbmap, size);
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret,
|
|
"Failed to allocate dirty tracking bitmap");
|
|
return ret;
|
|
}
|
|
|
|
if (all_device_dirty_tracking) {
|
|
ret = vfio_devices_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
|
|
errp);
|
|
} else {
|
|
ret = vfio_container_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
|
|
errp);
|
|
}
|
|
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
dirty_pages = cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap, ram_addr,
|
|
vbmap.pages);
|
|
|
|
trace_vfio_get_dirty_bitmap(iova, size, vbmap.size, ram_addr, dirty_pages);
|
|
out:
|
|
g_free(vbmap.bitmap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
typedef struct {
|
|
IOMMUNotifier n;
|
|
VFIOGuestIOMMU *giommu;
|
|
} vfio_giommu_dirty_notifier;
|
|
|
|
static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
|
|
{
|
|
vfio_giommu_dirty_notifier *gdn = container_of(n,
|
|
vfio_giommu_dirty_notifier, n);
|
|
VFIOGuestIOMMU *giommu = gdn->giommu;
|
|
VFIOContainerBase *bcontainer = giommu->bcontainer;
|
|
hwaddr iova = iotlb->iova + giommu->iommu_offset;
|
|
ram_addr_t translated_addr;
|
|
Error *local_err = NULL;
|
|
int ret = -EINVAL;
|
|
|
|
trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask);
|
|
|
|
if (iotlb->target_as != &address_space_memory) {
|
|
error_report("Wrong target AS \"%s\", only system memory is allowed",
|
|
iotlb->target_as->name ? iotlb->target_as->name : "none");
|
|
goto out;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
if (!vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL, &local_err)) {
|
|
error_report_err(local_err);
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = vfio_get_dirty_bitmap(bcontainer, iova, iotlb->addr_mask + 1,
|
|
translated_addr, &local_err);
|
|
if (ret) {
|
|
error_prepend(&local_err,
|
|
"vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx") failed - ", bcontainer, iova,
|
|
iotlb->addr_mask + 1);
|
|
error_report_err(local_err);
|
|
}
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
if (ret) {
|
|
vfio_set_migration_error(ret);
|
|
}
|
|
}
|
|
|
|
static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection *section,
|
|
void *opaque)
|
|
{
|
|
const hwaddr size = int128_get64(section->size);
|
|
const hwaddr iova = section->offset_within_address_space;
|
|
const ram_addr_t ram_addr = memory_region_get_ram_addr(section->mr) +
|
|
section->offset_within_region;
|
|
VFIORamDiscardListener *vrdl = opaque;
|
|
Error *local_err = NULL;
|
|
int ret;
|
|
|
|
/*
|
|
* Sync the whole mapped region (spanning multiple individual mappings)
|
|
* in one go.
|
|
*/
|
|
ret = vfio_get_dirty_bitmap(vrdl->bcontainer, iova, size, ram_addr,
|
|
&local_err);
|
|
if (ret) {
|
|
error_report_err(local_err);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainerBase *bcontainer,
|
|
MemoryRegionSection *section)
|
|
{
|
|
RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr);
|
|
VFIORamDiscardListener *vrdl = NULL;
|
|
|
|
QLIST_FOREACH(vrdl, &bcontainer->vrdl_list, next) {
|
|
if (vrdl->mr == section->mr &&
|
|
vrdl->offset_within_address_space ==
|
|
section->offset_within_address_space) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!vrdl) {
|
|
hw_error("vfio: Trying to sync missing RAM discard listener");
|
|
}
|
|
|
|
/*
|
|
* We only want/can synchronize the bitmap for actually mapped parts -
|
|
* which correspond to populated parts. Replay all populated parts.
|
|
*/
|
|
return ram_discard_manager_replay_populated(rdm, section,
|
|
vfio_ram_discard_get_dirty_bitmap,
|
|
&vrdl);
|
|
}
|
|
|
|
static int vfio_sync_iommu_dirty_bitmap(VFIOContainerBase *bcontainer,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIOGuestIOMMU *giommu;
|
|
bool found = false;
|
|
Int128 llend;
|
|
vfio_giommu_dirty_notifier gdn;
|
|
int idx;
|
|
|
|
QLIST_FOREACH(giommu, &bcontainer->giommu_list, giommu_next) {
|
|
if (MEMORY_REGION(giommu->iommu_mr) == section->mr &&
|
|
giommu->n.start == section->offset_within_region) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
return 0;
|
|
}
|
|
|
|
gdn.giommu = giommu;
|
|
idx = memory_region_iommu_attrs_to_index(giommu->iommu_mr,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
|
|
llend = int128_add(int128_make64(section->offset_within_region),
|
|
section->size);
|
|
llend = int128_sub(llend, int128_one());
|
|
|
|
iommu_notifier_init(&gdn.n, vfio_iommu_map_dirty_notify, IOMMU_NOTIFIER_MAP,
|
|
section->offset_within_region, int128_get64(llend),
|
|
idx);
|
|
memory_region_iommu_replay(giommu->iommu_mr, &gdn.n);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
|
|
MemoryRegionSection *section, Error **errp)
|
|
{
|
|
ram_addr_t ram_addr;
|
|
|
|
if (memory_region_is_iommu(section->mr)) {
|
|
return vfio_sync_iommu_dirty_bitmap(bcontainer, section);
|
|
} else if (memory_region_has_ram_discard_manager(section->mr)) {
|
|
int ret;
|
|
|
|
ret = vfio_sync_ram_discard_listener_dirty_bitmap(bcontainer, section);
|
|
if (ret) {
|
|
error_setg(errp,
|
|
"Failed to sync dirty bitmap with RAM discard listener");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
ram_addr = memory_region_get_ram_addr(section->mr) +
|
|
section->offset_within_region;
|
|
|
|
return vfio_get_dirty_bitmap(bcontainer,
|
|
REAL_HOST_PAGE_ALIGN(section->offset_within_address_space),
|
|
int128_get64(section->size), ram_addr, errp);
|
|
}
|
|
|
|
static void vfio_listener_log_sync(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
|
|
listener);
|
|
int ret;
|
|
Error *local_err = NULL;
|
|
|
|
if (vfio_listener_skipped_section(section)) {
|
|
return;
|
|
}
|
|
|
|
if (vfio_devices_all_dirty_tracking(bcontainer)) {
|
|
ret = vfio_sync_dirty_bitmap(bcontainer, section, &local_err);
|
|
if (ret) {
|
|
error_report_err(local_err);
|
|
vfio_set_migration_error(ret);
|
|
}
|
|
}
|
|
}
|
|
|
|
const MemoryListener vfio_memory_listener = {
|
|
.name = "vfio",
|
|
.region_add = vfio_listener_region_add,
|
|
.region_del = vfio_listener_region_del,
|
|
.log_global_start = vfio_listener_log_global_start,
|
|
.log_global_stop = vfio_listener_log_global_stop,
|
|
.log_sync = vfio_listener_log_sync,
|
|
};
|
|
|
|
void vfio_reset_handler(void *opaque)
|
|
{
|
|
VFIODevice *vbasedev;
|
|
|
|
QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
|
|
if (vbasedev->dev->realized) {
|
|
vbasedev->ops->vfio_compute_needs_reset(vbasedev);
|
|
}
|
|
}
|
|
|
|
QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
|
|
if (vbasedev->dev->realized && vbasedev->needs_reset) {
|
|
vbasedev->ops->vfio_hot_reset_multi(vbasedev);
|
|
}
|
|
}
|
|
}
|
|
|
|
int vfio_kvm_device_add_fd(int fd, Error **errp)
|
|
{
|
|
#ifdef CONFIG_KVM
|
|
struct kvm_device_attr attr = {
|
|
.group = KVM_DEV_VFIO_FILE,
|
|
.attr = KVM_DEV_VFIO_FILE_ADD,
|
|
.addr = (uint64_t)(unsigned long)&fd,
|
|
};
|
|
|
|
if (!kvm_enabled()) {
|
|
return 0;
|
|
}
|
|
|
|
if (vfio_kvm_device_fd < 0) {
|
|
struct kvm_create_device cd = {
|
|
.type = KVM_DEV_TYPE_VFIO,
|
|
};
|
|
|
|
if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
|
|
error_setg_errno(errp, errno, "Failed to create KVM VFIO device");
|
|
return -errno;
|
|
}
|
|
|
|
vfio_kvm_device_fd = cd.fd;
|
|
}
|
|
|
|
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
|
|
error_setg_errno(errp, errno, "Failed to add fd %d to KVM VFIO device",
|
|
fd);
|
|
return -errno;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int vfio_kvm_device_del_fd(int fd, Error **errp)
|
|
{
|
|
#ifdef CONFIG_KVM
|
|
struct kvm_device_attr attr = {
|
|
.group = KVM_DEV_VFIO_FILE,
|
|
.attr = KVM_DEV_VFIO_FILE_DEL,
|
|
.addr = (uint64_t)(unsigned long)&fd,
|
|
};
|
|
|
|
if (vfio_kvm_device_fd < 0) {
|
|
error_setg(errp, "KVM VFIO device isn't created yet");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
|
|
error_setg_errno(errp, errno,
|
|
"Failed to remove fd %d from KVM VFIO device", fd);
|
|
return -errno;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
|
|
{
|
|
VFIOAddressSpace *space;
|
|
|
|
QLIST_FOREACH(space, &vfio_address_spaces, list) {
|
|
if (space->as == as) {
|
|
return space;
|
|
}
|
|
}
|
|
|
|
/* No suitable VFIOAddressSpace, create a new one */
|
|
space = g_malloc0(sizeof(*space));
|
|
space->as = as;
|
|
QLIST_INIT(&space->containers);
|
|
|
|
if (QLIST_EMPTY(&vfio_address_spaces)) {
|
|
qemu_register_reset(vfio_reset_handler, NULL);
|
|
}
|
|
|
|
QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);
|
|
|
|
return space;
|
|
}
|
|
|
|
void vfio_put_address_space(VFIOAddressSpace *space)
|
|
{
|
|
if (!QLIST_EMPTY(&space->containers)) {
|
|
return;
|
|
}
|
|
|
|
QLIST_REMOVE(space, list);
|
|
g_free(space);
|
|
|
|
if (QLIST_EMPTY(&vfio_address_spaces)) {
|
|
qemu_unregister_reset(vfio_reset_handler, NULL);
|
|
}
|
|
}
|
|
|
|
void vfio_address_space_insert(VFIOAddressSpace *space,
|
|
VFIOContainerBase *bcontainer)
|
|
{
|
|
QLIST_INSERT_HEAD(&space->containers, bcontainer, next);
|
|
bcontainer->space = space;
|
|
}
|
|
|
|
struct vfio_device_info *vfio_get_device_info(int fd)
|
|
{
|
|
struct vfio_device_info *info;
|
|
uint32_t argsz = sizeof(*info);
|
|
|
|
info = g_malloc0(argsz);
|
|
|
|
retry:
|
|
info->argsz = argsz;
|
|
|
|
if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
|
|
g_free(info);
|
|
return NULL;
|
|
}
|
|
|
|
if (info->argsz > argsz) {
|
|
argsz = info->argsz;
|
|
info = g_realloc(info, argsz);
|
|
goto retry;
|
|
}
|
|
|
|
return info;
|
|
}
|
|
|
|
bool vfio_attach_device(char *name, VFIODevice *vbasedev,
|
|
AddressSpace *as, Error **errp)
|
|
{
|
|
const VFIOIOMMUClass *ops =
|
|
VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_LEGACY));
|
|
HostIOMMUDevice *hiod = NULL;
|
|
|
|
if (vbasedev->iommufd) {
|
|
ops = VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_IOMMUFD));
|
|
}
|
|
|
|
assert(ops);
|
|
|
|
|
|
if (!vbasedev->mdev) {
|
|
hiod = HOST_IOMMU_DEVICE(object_new(ops->hiod_typename));
|
|
vbasedev->hiod = hiod;
|
|
}
|
|
|
|
if (!ops->attach_device(name, vbasedev, as, errp)) {
|
|
object_unref(hiod);
|
|
vbasedev->hiod = NULL;
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void vfio_detach_device(VFIODevice *vbasedev)
|
|
{
|
|
if (!vbasedev->bcontainer) {
|
|
return;
|
|
}
|
|
object_unref(vbasedev->hiod);
|
|
VFIO_IOMMU_GET_CLASS(vbasedev->bcontainer)->detach_device(vbasedev);
|
|
}
|