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1052 lines
35 KiB
C
1052 lines
35 KiB
C
/*
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* Copyright (c) 2003-2004 Fabrice Bellard
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* Copyright (c) 2019, 2024 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/error-report.h"
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#include "qemu/cutils.h"
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#include "qemu/units.h"
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#include "qemu/datadir.h"
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#include "qapi/error.h"
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#include "sysemu/numa.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/xen.h"
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#include "trace.h"
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#include "hw/i386/x86.h"
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#include "target/i386/cpu.h"
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#include "hw/rtc/mc146818rtc.h"
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#include "target/i386/sev.h"
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#include "hw/acpi/cpu_hotplug.h"
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#include "hw/irq.h"
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#include "hw/loader.h"
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#include "multiboot.h"
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#include "elf.h"
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#include "standard-headers/asm-x86/bootparam.h"
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#include CONFIG_DEVICES
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#include "kvm/kvm_i386.h"
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#ifdef CONFIG_XEN_EMU
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#include "hw/xen/xen.h"
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#include "hw/i386/kvm/xen_evtchn.h"
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#endif
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/* Physical Address of PVH entry point read from kernel ELF NOTE */
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static size_t pvh_start_addr;
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static void x86_cpu_new(X86MachineState *x86ms, int64_t apic_id, Error **errp)
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{
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Object *cpu = object_new(MACHINE(x86ms)->cpu_type);
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if (!object_property_set_uint(cpu, "apic-id", apic_id, errp)) {
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goto out;
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}
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qdev_realize(DEVICE(cpu), NULL, errp);
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out:
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object_unref(cpu);
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}
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void x86_cpus_init(X86MachineState *x86ms, int default_cpu_version)
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{
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int i;
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const CPUArchIdList *possible_cpus;
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MachineState *ms = MACHINE(x86ms);
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MachineClass *mc = MACHINE_GET_CLASS(x86ms);
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x86_cpu_set_default_version(default_cpu_version);
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/*
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* Calculates the limit to CPU APIC ID values
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*
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* Limit for the APIC ID value, so that all
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* CPU APIC IDs are < x86ms->apic_id_limit.
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*
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* This is used for FW_CFG_MAX_CPUS. See comments on fw_cfg_arch_create().
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*/
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x86ms->apic_id_limit = x86_cpu_apic_id_from_index(x86ms,
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ms->smp.max_cpus - 1) + 1;
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/*
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* Can we support APIC ID 255 or higher? With KVM, that requires
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* both in-kernel lapic and X2APIC userspace API.
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*
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* kvm_enabled() must go first to ensure that kvm_* references are
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* not emitted for the linker to consume (kvm_enabled() is
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* a literal `0` in configurations where kvm_* aren't defined)
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*/
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if (kvm_enabled() && x86ms->apic_id_limit > 255 &&
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kvm_irqchip_in_kernel() && !kvm_enable_x2apic()) {
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error_report("current -smp configuration requires kernel "
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"irqchip and X2APIC API support.");
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exit(EXIT_FAILURE);
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}
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if (kvm_enabled()) {
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kvm_set_max_apic_id(x86ms->apic_id_limit);
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}
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if (!kvm_irqchip_in_kernel()) {
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apic_set_max_apic_id(x86ms->apic_id_limit);
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}
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possible_cpus = mc->possible_cpu_arch_ids(ms);
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for (i = 0; i < ms->smp.cpus; i++) {
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x86_cpu_new(x86ms, possible_cpus->cpus[i].arch_id, &error_fatal);
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}
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}
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void x86_rtc_set_cpus_count(ISADevice *s, uint16_t cpus_count)
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{
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MC146818RtcState *rtc = MC146818_RTC(s);
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if (cpus_count > 0xff) {
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/*
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* If the number of CPUs can't be represented in 8 bits, the
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* BIOS must use "FW_CFG_NB_CPUS". Set RTC field to 0 just
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* to make old BIOSes fail more predictably.
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*/
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mc146818rtc_set_cmos_data(rtc, 0x5f, 0);
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} else {
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mc146818rtc_set_cmos_data(rtc, 0x5f, cpus_count - 1);
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}
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}
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static int x86_apic_cmp(const void *a, const void *b)
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{
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CPUArchId *apic_a = (CPUArchId *)a;
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CPUArchId *apic_b = (CPUArchId *)b;
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return apic_a->arch_id - apic_b->arch_id;
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}
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/*
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* returns pointer to CPUArchId descriptor that matches CPU's apic_id
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* in ms->possible_cpus->cpus, if ms->possible_cpus->cpus has no
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* entry corresponding to CPU's apic_id returns NULL.
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*/
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static CPUArchId *x86_find_cpu_slot(MachineState *ms, uint32_t id, int *idx)
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{
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CPUArchId apic_id, *found_cpu;
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apic_id.arch_id = id;
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found_cpu = bsearch(&apic_id, ms->possible_cpus->cpus,
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ms->possible_cpus->len, sizeof(*ms->possible_cpus->cpus),
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x86_apic_cmp);
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if (found_cpu && idx) {
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*idx = found_cpu - ms->possible_cpus->cpus;
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}
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return found_cpu;
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}
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void x86_cpu_plug(HotplugHandler *hotplug_dev,
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DeviceState *dev, Error **errp)
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{
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CPUArchId *found_cpu;
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Error *local_err = NULL;
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X86CPU *cpu = X86_CPU(dev);
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X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
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if (x86ms->acpi_dev) {
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hotplug_handler_plug(x86ms->acpi_dev, dev, &local_err);
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if (local_err) {
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goto out;
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}
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}
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/* increment the number of CPUs */
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x86ms->boot_cpus++;
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if (x86ms->rtc) {
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x86_rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);
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}
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if (x86ms->fw_cfg) {
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fw_cfg_modify_i16(x86ms->fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus);
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}
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found_cpu = x86_find_cpu_slot(MACHINE(x86ms), cpu->apic_id, NULL);
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found_cpu->cpu = CPU(dev);
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out:
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error_propagate(errp, local_err);
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}
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void x86_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
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DeviceState *dev, Error **errp)
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{
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int idx = -1;
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X86CPU *cpu = X86_CPU(dev);
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X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
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if (!x86ms->acpi_dev) {
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error_setg(errp, "CPU hot unplug not supported without ACPI");
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return;
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}
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x86_find_cpu_slot(MACHINE(x86ms), cpu->apic_id, &idx);
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assert(idx != -1);
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if (idx == 0) {
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error_setg(errp, "Boot CPU is unpluggable");
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return;
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}
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hotplug_handler_unplug_request(x86ms->acpi_dev, dev,
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errp);
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}
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void x86_cpu_unplug_cb(HotplugHandler *hotplug_dev,
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DeviceState *dev, Error **errp)
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{
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CPUArchId *found_cpu;
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Error *local_err = NULL;
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X86CPU *cpu = X86_CPU(dev);
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X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
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hotplug_handler_unplug(x86ms->acpi_dev, dev, &local_err);
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if (local_err) {
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goto out;
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}
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found_cpu = x86_find_cpu_slot(MACHINE(x86ms), cpu->apic_id, NULL);
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found_cpu->cpu = NULL;
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qdev_unrealize(dev);
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/* decrement the number of CPUs */
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x86ms->boot_cpus--;
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/* Update the number of CPUs in CMOS */
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x86_rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);
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fw_cfg_modify_i16(x86ms->fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus);
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out:
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error_propagate(errp, local_err);
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}
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void x86_cpu_pre_plug(HotplugHandler *hotplug_dev,
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DeviceState *dev, Error **errp)
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{
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int idx;
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CPUState *cs;
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CPUArchId *cpu_slot;
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X86CPUTopoIDs topo_ids;
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X86CPU *cpu = X86_CPU(dev);
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CPUX86State *env = &cpu->env;
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MachineState *ms = MACHINE(hotplug_dev);
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X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
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unsigned int smp_cores = ms->smp.cores;
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unsigned int smp_threads = ms->smp.threads;
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X86CPUTopoInfo topo_info;
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if (!object_dynamic_cast(OBJECT(cpu), ms->cpu_type)) {
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error_setg(errp, "Invalid CPU type, expected cpu type: '%s'",
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ms->cpu_type);
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return;
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}
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if (x86ms->acpi_dev) {
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Error *local_err = NULL;
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hotplug_handler_pre_plug(HOTPLUG_HANDLER(x86ms->acpi_dev), dev,
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&local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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}
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init_topo_info(&topo_info, x86ms);
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if (ms->smp.modules > 1) {
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env->nr_modules = ms->smp.modules;
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set_bit(CPU_TOPOLOGY_LEVEL_MODULE, env->avail_cpu_topo);
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}
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if (ms->smp.dies > 1) {
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env->nr_dies = ms->smp.dies;
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set_bit(CPU_TOPOLOGY_LEVEL_DIE, env->avail_cpu_topo);
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}
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/*
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* If APIC ID is not set,
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* set it based on socket/die/module/core/thread properties.
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*/
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if (cpu->apic_id == UNASSIGNED_APIC_ID) {
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/*
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* die-id was optional in QEMU 4.0 and older, so keep it optional
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* if there's only one die per socket.
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*/
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if (cpu->die_id < 0 && ms->smp.dies == 1) {
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cpu->die_id = 0;
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}
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/*
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* module-id was optional in QEMU 9.0 and older, so keep it optional
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* if there's only one module per die.
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*/
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if (cpu->module_id < 0 && ms->smp.modules == 1) {
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cpu->module_id = 0;
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}
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if (cpu->socket_id < 0) {
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error_setg(errp, "CPU socket-id is not set");
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return;
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} else if (cpu->socket_id > ms->smp.sockets - 1) {
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error_setg(errp, "Invalid CPU socket-id: %u must be in range 0:%u",
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cpu->socket_id, ms->smp.sockets - 1);
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return;
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}
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if (cpu->die_id < 0) {
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error_setg(errp, "CPU die-id is not set");
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return;
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} else if (cpu->die_id > ms->smp.dies - 1) {
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error_setg(errp, "Invalid CPU die-id: %u must be in range 0:%u",
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cpu->die_id, ms->smp.dies - 1);
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return;
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}
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if (cpu->module_id < 0) {
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error_setg(errp, "CPU module-id is not set");
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return;
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} else if (cpu->module_id > ms->smp.modules - 1) {
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error_setg(errp, "Invalid CPU module-id: %u must be in range 0:%u",
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cpu->module_id, ms->smp.modules - 1);
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return;
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}
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if (cpu->core_id < 0) {
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error_setg(errp, "CPU core-id is not set");
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return;
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} else if (cpu->core_id > (smp_cores - 1)) {
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error_setg(errp, "Invalid CPU core-id: %u must be in range 0:%u",
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cpu->core_id, smp_cores - 1);
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return;
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}
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if (cpu->thread_id < 0) {
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error_setg(errp, "CPU thread-id is not set");
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return;
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} else if (cpu->thread_id > (smp_threads - 1)) {
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error_setg(errp, "Invalid CPU thread-id: %u must be in range 0:%u",
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cpu->thread_id, smp_threads - 1);
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return;
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}
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topo_ids.pkg_id = cpu->socket_id;
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topo_ids.die_id = cpu->die_id;
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topo_ids.module_id = cpu->module_id;
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topo_ids.core_id = cpu->core_id;
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topo_ids.smt_id = cpu->thread_id;
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cpu->apic_id = x86_apicid_from_topo_ids(&topo_info, &topo_ids);
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}
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cpu_slot = x86_find_cpu_slot(MACHINE(x86ms), cpu->apic_id, &idx);
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if (!cpu_slot) {
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x86_topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
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|
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error_setg(errp,
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"Invalid CPU [socket: %u, die: %u, module: %u, core: %u, thread: %u]"
|
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" with APIC ID %" PRIu32 ", valid index range 0:%d",
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topo_ids.pkg_id, topo_ids.die_id, topo_ids.module_id,
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topo_ids.core_id, topo_ids.smt_id, cpu->apic_id,
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ms->possible_cpus->len - 1);
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return;
|
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}
|
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|
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if (cpu_slot->cpu) {
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error_setg(errp, "CPU[%d] with APIC ID %" PRIu32 " exists",
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idx, cpu->apic_id);
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return;
|
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}
|
|
|
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/* if 'address' properties socket-id/core-id/thread-id are not set, set them
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* so that machine_query_hotpluggable_cpus would show correct values
|
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*/
|
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/* TODO: move socket_id/core_id/thread_id checks into x86_cpu_realizefn()
|
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* once -smp refactoring is complete and there will be CPU private
|
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* CPUState::nr_cores and CPUState::nr_threads fields instead of globals */
|
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x86_topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
|
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if (cpu->socket_id != -1 && cpu->socket_id != topo_ids.pkg_id) {
|
|
error_setg(errp, "property socket-id: %u doesn't match set apic-id:"
|
|
" 0x%x (socket-id: %u)", cpu->socket_id, cpu->apic_id,
|
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topo_ids.pkg_id);
|
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return;
|
|
}
|
|
cpu->socket_id = topo_ids.pkg_id;
|
|
|
|
if (cpu->die_id != -1 && cpu->die_id != topo_ids.die_id) {
|
|
error_setg(errp, "property die-id: %u doesn't match set apic-id:"
|
|
" 0x%x (die-id: %u)", cpu->die_id, cpu->apic_id, topo_ids.die_id);
|
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return;
|
|
}
|
|
cpu->die_id = topo_ids.die_id;
|
|
|
|
if (cpu->module_id != -1 && cpu->module_id != topo_ids.module_id) {
|
|
error_setg(errp, "property module-id: %u doesn't match set apic-id:"
|
|
" 0x%x (module-id: %u)", cpu->module_id, cpu->apic_id,
|
|
topo_ids.module_id);
|
|
return;
|
|
}
|
|
cpu->module_id = topo_ids.module_id;
|
|
|
|
if (cpu->core_id != -1 && cpu->core_id != topo_ids.core_id) {
|
|
error_setg(errp, "property core-id: %u doesn't match set apic-id:"
|
|
" 0x%x (core-id: %u)", cpu->core_id, cpu->apic_id,
|
|
topo_ids.core_id);
|
|
return;
|
|
}
|
|
cpu->core_id = topo_ids.core_id;
|
|
|
|
if (cpu->thread_id != -1 && cpu->thread_id != topo_ids.smt_id) {
|
|
error_setg(errp, "property thread-id: %u doesn't match set apic-id:"
|
|
" 0x%x (thread-id: %u)", cpu->thread_id, cpu->apic_id,
|
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topo_ids.smt_id);
|
|
return;
|
|
}
|
|
cpu->thread_id = topo_ids.smt_id;
|
|
|
|
/*
|
|
* kvm_enabled() must go first to ensure that kvm_* references are
|
|
* not emitted for the linker to consume (kvm_enabled() is
|
|
* a literal `0` in configurations where kvm_* aren't defined)
|
|
*/
|
|
if (kvm_enabled() && hyperv_feat_enabled(cpu, HYPERV_FEAT_VPINDEX) &&
|
|
!kvm_hv_vpindex_settable()) {
|
|
error_setg(errp, "kernel doesn't allow setting HyperV VP_INDEX");
|
|
return;
|
|
}
|
|
|
|
cs = CPU(cpu);
|
|
cs->cpu_index = idx;
|
|
|
|
numa_cpu_pre_plug(cpu_slot, dev, errp);
|
|
}
|
|
|
|
static long get_file_size(FILE *f)
|
|
{
|
|
long where, size;
|
|
|
|
/* XXX: on Unix systems, using fstat() probably makes more sense */
|
|
|
|
where = ftell(f);
|
|
fseek(f, 0, SEEK_END);
|
|
size = ftell(f);
|
|
fseek(f, where, SEEK_SET);
|
|
|
|
return size;
|
|
}
|
|
|
|
void gsi_handler(void *opaque, int n, int level)
|
|
{
|
|
GSIState *s = opaque;
|
|
|
|
trace_x86_gsi_interrupt(n, level);
|
|
switch (n) {
|
|
case 0 ... ISA_NUM_IRQS - 1:
|
|
if (s->i8259_irq[n]) {
|
|
/* Under KVM, Kernel will forward to both PIC and IOAPIC */
|
|
qemu_set_irq(s->i8259_irq[n], level);
|
|
}
|
|
/* fall through */
|
|
case ISA_NUM_IRQS ... IOAPIC_NUM_PINS - 1:
|
|
#ifdef CONFIG_XEN_EMU
|
|
/*
|
|
* Xen delivers the GSI to the Legacy PIC (not that Legacy PIC
|
|
* routing actually works properly under Xen). And then to
|
|
* *either* the PIRQ handling or the I/OAPIC depending on
|
|
* whether the former wants it.
|
|
*/
|
|
if (xen_mode == XEN_EMULATE && xen_evtchn_set_gsi(n, level)) {
|
|
break;
|
|
}
|
|
#endif
|
|
qemu_set_irq(s->ioapic_irq[n], level);
|
|
break;
|
|
case IO_APIC_SECONDARY_IRQBASE
|
|
... IO_APIC_SECONDARY_IRQBASE + IOAPIC_NUM_PINS - 1:
|
|
qemu_set_irq(s->ioapic2_irq[n - IO_APIC_SECONDARY_IRQBASE], level);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void ioapic_init_gsi(GSIState *gsi_state, Object *parent)
|
|
{
|
|
DeviceState *dev;
|
|
SysBusDevice *d;
|
|
unsigned int i;
|
|
|
|
assert(parent);
|
|
if (kvm_ioapic_in_kernel()) {
|
|
dev = qdev_new(TYPE_KVM_IOAPIC);
|
|
} else {
|
|
dev = qdev_new(TYPE_IOAPIC);
|
|
}
|
|
object_property_add_child(parent, "ioapic", OBJECT(dev));
|
|
d = SYS_BUS_DEVICE(dev);
|
|
sysbus_realize_and_unref(d, &error_fatal);
|
|
sysbus_mmio_map(d, 0, IO_APIC_DEFAULT_ADDRESS);
|
|
|
|
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
|
|
gsi_state->ioapic_irq[i] = qdev_get_gpio_in(dev, i);
|
|
}
|
|
}
|
|
|
|
DeviceState *ioapic_init_secondary(GSIState *gsi_state)
|
|
{
|
|
DeviceState *dev;
|
|
SysBusDevice *d;
|
|
unsigned int i;
|
|
|
|
dev = qdev_new(TYPE_IOAPIC);
|
|
d = SYS_BUS_DEVICE(dev);
|
|
sysbus_realize_and_unref(d, &error_fatal);
|
|
sysbus_mmio_map(d, 0, IO_APIC_SECONDARY_ADDRESS);
|
|
|
|
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
|
|
gsi_state->ioapic2_irq[i] = qdev_get_gpio_in(dev, i);
|
|
}
|
|
return dev;
|
|
}
|
|
|
|
/*
|
|
* The entry point into the kernel for PVH boot is different from
|
|
* the native entry point. The PVH entry is defined by the x86/HVM
|
|
* direct boot ABI and is available in an ELFNOTE in the kernel binary.
|
|
*
|
|
* This function is passed to load_elf() when it is called from
|
|
* load_elfboot() which then additionally checks for an ELF Note of
|
|
* type XEN_ELFNOTE_PHYS32_ENTRY and passes it to this function to
|
|
* parse the PVH entry address from the ELF Note.
|
|
*
|
|
* Due to trickery in elf_opts.h, load_elf() is actually available as
|
|
* load_elf32() or load_elf64() and this routine needs to be able
|
|
* to deal with being called as 32 or 64 bit.
|
|
*
|
|
* The address of the PVH entry point is saved to the 'pvh_start_addr'
|
|
* global variable. (although the entry point is 32-bit, the kernel
|
|
* binary can be either 32-bit or 64-bit).
|
|
*/
|
|
static uint64_t read_pvh_start_addr(void *arg1, void *arg2, bool is64)
|
|
{
|
|
size_t *elf_note_data_addr;
|
|
|
|
/* Check if ELF Note header passed in is valid */
|
|
if (arg1 == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
if (is64) {
|
|
struct elf64_note *nhdr64 = (struct elf64_note *)arg1;
|
|
uint64_t nhdr_size64 = sizeof(struct elf64_note);
|
|
uint64_t phdr_align = *(uint64_t *)arg2;
|
|
uint64_t nhdr_namesz = nhdr64->n_namesz;
|
|
|
|
elf_note_data_addr =
|
|
((void *)nhdr64) + nhdr_size64 +
|
|
QEMU_ALIGN_UP(nhdr_namesz, phdr_align);
|
|
|
|
pvh_start_addr = *elf_note_data_addr;
|
|
} else {
|
|
struct elf32_note *nhdr32 = (struct elf32_note *)arg1;
|
|
uint32_t nhdr_size32 = sizeof(struct elf32_note);
|
|
uint32_t phdr_align = *(uint32_t *)arg2;
|
|
uint32_t nhdr_namesz = nhdr32->n_namesz;
|
|
|
|
elf_note_data_addr =
|
|
((void *)nhdr32) + nhdr_size32 +
|
|
QEMU_ALIGN_UP(nhdr_namesz, phdr_align);
|
|
|
|
pvh_start_addr = *(uint32_t *)elf_note_data_addr;
|
|
}
|
|
|
|
return pvh_start_addr;
|
|
}
|
|
|
|
static bool load_elfboot(const char *kernel_filename,
|
|
int kernel_file_size,
|
|
uint8_t *header,
|
|
size_t pvh_xen_start_addr,
|
|
FWCfgState *fw_cfg)
|
|
{
|
|
uint32_t flags = 0;
|
|
uint32_t mh_load_addr = 0;
|
|
uint32_t elf_kernel_size = 0;
|
|
uint64_t elf_entry;
|
|
uint64_t elf_low, elf_high;
|
|
int kernel_size;
|
|
|
|
if (ldl_le_p(header) != 0x464c457f) {
|
|
return false; /* no elfboot */
|
|
}
|
|
|
|
bool elf_is64 = header[EI_CLASS] == ELFCLASS64;
|
|
flags = elf_is64 ?
|
|
((Elf64_Ehdr *)header)->e_flags : ((Elf32_Ehdr *)header)->e_flags;
|
|
|
|
if (flags & 0x00010004) { /* LOAD_ELF_HEADER_HAS_ADDR */
|
|
error_report("elfboot unsupported flags = %x", flags);
|
|
exit(1);
|
|
}
|
|
|
|
uint64_t elf_note_type = XEN_ELFNOTE_PHYS32_ENTRY;
|
|
kernel_size = load_elf(kernel_filename, read_pvh_start_addr,
|
|
NULL, &elf_note_type, &elf_entry,
|
|
&elf_low, &elf_high, NULL, 0, I386_ELF_MACHINE,
|
|
0, 0);
|
|
|
|
if (kernel_size < 0) {
|
|
error_report("Error while loading elf kernel");
|
|
exit(1);
|
|
}
|
|
mh_load_addr = elf_low;
|
|
elf_kernel_size = elf_high - elf_low;
|
|
|
|
if (pvh_start_addr == 0) {
|
|
error_report("Error loading uncompressed kernel without PVH ELF Note");
|
|
exit(1);
|
|
}
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, pvh_start_addr);
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, elf_kernel_size);
|
|
|
|
return true;
|
|
}
|
|
|
|
void x86_load_linux(X86MachineState *x86ms,
|
|
FWCfgState *fw_cfg,
|
|
int acpi_data_size,
|
|
bool pvh_enabled)
|
|
{
|
|
bool linuxboot_dma_enabled = X86_MACHINE_GET_CLASS(x86ms)->fwcfg_dma_enabled;
|
|
uint16_t protocol;
|
|
int setup_size, kernel_size, cmdline_size;
|
|
int dtb_size, setup_data_offset;
|
|
uint32_t initrd_max;
|
|
uint8_t header[8192], *setup, *kernel;
|
|
hwaddr real_addr, prot_addr, cmdline_addr, initrd_addr = 0;
|
|
FILE *f;
|
|
char *vmode;
|
|
MachineState *machine = MACHINE(x86ms);
|
|
struct setup_data *setup_data;
|
|
const char *kernel_filename = machine->kernel_filename;
|
|
const char *initrd_filename = machine->initrd_filename;
|
|
const char *dtb_filename = machine->dtb;
|
|
const char *kernel_cmdline = machine->kernel_cmdline;
|
|
SevKernelLoaderContext sev_load_ctx = {};
|
|
|
|
/* Align to 16 bytes as a paranoia measure */
|
|
cmdline_size = (strlen(kernel_cmdline) + 16) & ~15;
|
|
|
|
/* load the kernel header */
|
|
f = fopen(kernel_filename, "rb");
|
|
if (!f) {
|
|
fprintf(stderr, "qemu: could not open kernel file '%s': %s\n",
|
|
kernel_filename, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
kernel_size = get_file_size(f);
|
|
if (!kernel_size ||
|
|
fread(header, 1, MIN(ARRAY_SIZE(header), kernel_size), f) !=
|
|
MIN(ARRAY_SIZE(header), kernel_size)) {
|
|
fprintf(stderr, "qemu: could not load kernel '%s': %s\n",
|
|
kernel_filename, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* kernel protocol version.
|
|
* Please see https://www.kernel.org/doc/Documentation/x86/boot.txt
|
|
*/
|
|
if (ldl_le_p(header + 0x202) == 0x53726448) /* Magic signature "HdrS" */ {
|
|
protocol = lduw_le_p(header + 0x206);
|
|
} else {
|
|
/*
|
|
* This could be a multiboot kernel. If it is, let's stop treating it
|
|
* like a Linux kernel.
|
|
* Note: some multiboot images could be in the ELF format (the same of
|
|
* PVH), so we try multiboot first since we check the multiboot magic
|
|
* header before to load it.
|
|
*/
|
|
if (load_multiboot(x86ms, fw_cfg, f, kernel_filename, initrd_filename,
|
|
kernel_cmdline, kernel_size, header)) {
|
|
return;
|
|
}
|
|
/*
|
|
* Check if the file is an uncompressed kernel file (ELF) and load it,
|
|
* saving the PVH entry point used by the x86/HVM direct boot ABI.
|
|
* If load_elfboot() is successful, populate the fw_cfg info.
|
|
*/
|
|
if (pvh_enabled &&
|
|
load_elfboot(kernel_filename, kernel_size,
|
|
header, pvh_start_addr, fw_cfg)) {
|
|
fclose(f);
|
|
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_SIZE,
|
|
strlen(kernel_cmdline) + 1);
|
|
fw_cfg_add_string(fw_cfg, FW_CFG_CMDLINE_DATA, kernel_cmdline);
|
|
|
|
setup = g_memdup2(header, sizeof(header));
|
|
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_SIZE, sizeof(header));
|
|
fw_cfg_add_bytes(fw_cfg, FW_CFG_SETUP_DATA,
|
|
setup, sizeof(header));
|
|
|
|
/* load initrd */
|
|
if (initrd_filename) {
|
|
GMappedFile *mapped_file;
|
|
gsize initrd_size;
|
|
gchar *initrd_data;
|
|
GError *gerr = NULL;
|
|
|
|
mapped_file = g_mapped_file_new(initrd_filename, false, &gerr);
|
|
if (!mapped_file) {
|
|
fprintf(stderr, "qemu: error reading initrd %s: %s\n",
|
|
initrd_filename, gerr->message);
|
|
exit(1);
|
|
}
|
|
x86ms->initrd_mapped_file = mapped_file;
|
|
|
|
initrd_data = g_mapped_file_get_contents(mapped_file);
|
|
initrd_size = g_mapped_file_get_length(mapped_file);
|
|
initrd_max = x86ms->below_4g_mem_size - acpi_data_size - 1;
|
|
if (initrd_size >= initrd_max) {
|
|
fprintf(stderr, "qemu: initrd is too large, cannot support."
|
|
"(max: %"PRIu32", need %"PRId64")\n",
|
|
initrd_max, (uint64_t)initrd_size);
|
|
exit(1);
|
|
}
|
|
|
|
initrd_addr = (initrd_max - initrd_size) & ~4095;
|
|
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, initrd_addr);
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, initrd_size);
|
|
fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, initrd_data,
|
|
initrd_size);
|
|
}
|
|
|
|
option_rom[nb_option_roms].bootindex = 0;
|
|
option_rom[nb_option_roms].name = "pvh.bin";
|
|
nb_option_roms++;
|
|
|
|
return;
|
|
}
|
|
protocol = 0;
|
|
}
|
|
|
|
if (protocol < 0x200 || !(header[0x211] & 0x01)) {
|
|
/* Low kernel */
|
|
real_addr = 0x90000;
|
|
cmdline_addr = 0x9a000 - cmdline_size;
|
|
prot_addr = 0x10000;
|
|
} else if (protocol < 0x202) {
|
|
/* High but ancient kernel */
|
|
real_addr = 0x90000;
|
|
cmdline_addr = 0x9a000 - cmdline_size;
|
|
prot_addr = 0x100000;
|
|
} else {
|
|
/* High and recent kernel */
|
|
real_addr = 0x10000;
|
|
cmdline_addr = 0x20000;
|
|
prot_addr = 0x100000;
|
|
}
|
|
|
|
/* highest address for loading the initrd */
|
|
if (protocol >= 0x20c &&
|
|
lduw_le_p(header + 0x236) & XLF_CAN_BE_LOADED_ABOVE_4G) {
|
|
/*
|
|
* Linux has supported initrd up to 4 GB for a very long time (2007,
|
|
* long before XLF_CAN_BE_LOADED_ABOVE_4G which was added in 2013),
|
|
* though it only sets initrd_max to 2 GB to "work around bootloader
|
|
* bugs". Luckily, QEMU firmware(which does something like bootloader)
|
|
* has supported this.
|
|
*
|
|
* It's believed that if XLF_CAN_BE_LOADED_ABOVE_4G is set, initrd can
|
|
* be loaded into any address.
|
|
*
|
|
* In addition, initrd_max is uint32_t simply because QEMU doesn't
|
|
* support the 64-bit boot protocol (specifically the ext_ramdisk_image
|
|
* field).
|
|
*
|
|
* Therefore here just limit initrd_max to UINT32_MAX simply as well.
|
|
*/
|
|
initrd_max = UINT32_MAX;
|
|
} else if (protocol >= 0x203) {
|
|
initrd_max = ldl_le_p(header + 0x22c);
|
|
} else {
|
|
initrd_max = 0x37ffffff;
|
|
}
|
|
|
|
if (initrd_max >= x86ms->below_4g_mem_size - acpi_data_size) {
|
|
initrd_max = x86ms->below_4g_mem_size - acpi_data_size - 1;
|
|
}
|
|
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_ADDR, cmdline_addr);
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_SIZE, strlen(kernel_cmdline) + 1);
|
|
fw_cfg_add_string(fw_cfg, FW_CFG_CMDLINE_DATA, kernel_cmdline);
|
|
sev_load_ctx.cmdline_data = (char *)kernel_cmdline;
|
|
sev_load_ctx.cmdline_size = strlen(kernel_cmdline) + 1;
|
|
|
|
if (protocol >= 0x202) {
|
|
stl_le_p(header + 0x228, cmdline_addr);
|
|
} else {
|
|
stw_le_p(header + 0x20, 0xA33F);
|
|
stw_le_p(header + 0x22, cmdline_addr - real_addr);
|
|
}
|
|
|
|
/* handle vga= parameter */
|
|
vmode = strstr(kernel_cmdline, "vga=");
|
|
if (vmode) {
|
|
unsigned int video_mode;
|
|
const char *end;
|
|
int ret;
|
|
/* skip "vga=" */
|
|
vmode += 4;
|
|
if (!strncmp(vmode, "normal", 6)) {
|
|
video_mode = 0xffff;
|
|
} else if (!strncmp(vmode, "ext", 3)) {
|
|
video_mode = 0xfffe;
|
|
} else if (!strncmp(vmode, "ask", 3)) {
|
|
video_mode = 0xfffd;
|
|
} else {
|
|
ret = qemu_strtoui(vmode, &end, 0, &video_mode);
|
|
if (ret != 0 || (*end && *end != ' ')) {
|
|
fprintf(stderr, "qemu: invalid 'vga=' kernel parameter.\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
stw_le_p(header + 0x1fa, video_mode);
|
|
}
|
|
|
|
/* loader type */
|
|
/*
|
|
* High nybble = B reserved for QEMU; low nybble is revision number.
|
|
* If this code is substantially changed, you may want to consider
|
|
* incrementing the revision.
|
|
*/
|
|
if (protocol >= 0x200) {
|
|
header[0x210] = 0xB0;
|
|
}
|
|
/* heap */
|
|
if (protocol >= 0x201) {
|
|
header[0x211] |= 0x80; /* CAN_USE_HEAP */
|
|
stw_le_p(header + 0x224, cmdline_addr - real_addr - 0x200);
|
|
}
|
|
|
|
/* load initrd */
|
|
if (initrd_filename) {
|
|
GMappedFile *mapped_file;
|
|
gsize initrd_size;
|
|
gchar *initrd_data;
|
|
GError *gerr = NULL;
|
|
|
|
if (protocol < 0x200) {
|
|
fprintf(stderr, "qemu: linux kernel too old to load a ram disk\n");
|
|
exit(1);
|
|
}
|
|
|
|
mapped_file = g_mapped_file_new(initrd_filename, false, &gerr);
|
|
if (!mapped_file) {
|
|
fprintf(stderr, "qemu: error reading initrd %s: %s\n",
|
|
initrd_filename, gerr->message);
|
|
exit(1);
|
|
}
|
|
x86ms->initrd_mapped_file = mapped_file;
|
|
|
|
initrd_data = g_mapped_file_get_contents(mapped_file);
|
|
initrd_size = g_mapped_file_get_length(mapped_file);
|
|
if (initrd_size >= initrd_max) {
|
|
fprintf(stderr, "qemu: initrd is too large, cannot support."
|
|
"(max: %"PRIu32", need %"PRId64")\n",
|
|
initrd_max, (uint64_t)initrd_size);
|
|
exit(1);
|
|
}
|
|
|
|
initrd_addr = (initrd_max - initrd_size) & ~4095;
|
|
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, initrd_addr);
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, initrd_size);
|
|
fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, initrd_data, initrd_size);
|
|
sev_load_ctx.initrd_data = initrd_data;
|
|
sev_load_ctx.initrd_size = initrd_size;
|
|
|
|
stl_le_p(header + 0x218, initrd_addr);
|
|
stl_le_p(header + 0x21c, initrd_size);
|
|
}
|
|
|
|
/* load kernel and setup */
|
|
setup_size = header[0x1f1];
|
|
if (setup_size == 0) {
|
|
setup_size = 4;
|
|
}
|
|
setup_size = (setup_size + 1) * 512;
|
|
if (setup_size > kernel_size) {
|
|
fprintf(stderr, "qemu: invalid kernel header\n");
|
|
exit(1);
|
|
}
|
|
kernel_size -= setup_size;
|
|
|
|
setup = g_malloc(setup_size);
|
|
kernel = g_malloc(kernel_size);
|
|
fseek(f, 0, SEEK_SET);
|
|
if (fread(setup, 1, setup_size, f) != setup_size) {
|
|
fprintf(stderr, "fread() failed\n");
|
|
exit(1);
|
|
}
|
|
if (fread(kernel, 1, kernel_size, f) != kernel_size) {
|
|
fprintf(stderr, "fread() failed\n");
|
|
exit(1);
|
|
}
|
|
fclose(f);
|
|
|
|
/* append dtb to kernel */
|
|
if (dtb_filename) {
|
|
if (protocol < 0x209) {
|
|
fprintf(stderr, "qemu: Linux kernel too old to load a dtb\n");
|
|
exit(1);
|
|
}
|
|
|
|
dtb_size = get_image_size(dtb_filename);
|
|
if (dtb_size <= 0) {
|
|
fprintf(stderr, "qemu: error reading dtb %s: %s\n",
|
|
dtb_filename, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
setup_data_offset = QEMU_ALIGN_UP(kernel_size, 16);
|
|
kernel_size = setup_data_offset + sizeof(struct setup_data) + dtb_size;
|
|
kernel = g_realloc(kernel, kernel_size);
|
|
|
|
stq_le_p(header + 0x250, prot_addr + setup_data_offset);
|
|
|
|
setup_data = (struct setup_data *)(kernel + setup_data_offset);
|
|
setup_data->next = 0;
|
|
setup_data->type = cpu_to_le32(SETUP_DTB);
|
|
setup_data->len = cpu_to_le32(dtb_size);
|
|
|
|
load_image_size(dtb_filename, setup_data->data, dtb_size);
|
|
}
|
|
|
|
/*
|
|
* If we're starting an encrypted VM, it will be OVMF based, which uses the
|
|
* efi stub for booting and doesn't require any values to be placed in the
|
|
* kernel header. We therefore don't update the header so the hash of the
|
|
* kernel on the other side of the fw_cfg interface matches the hash of the
|
|
* file the user passed in.
|
|
*/
|
|
if (!sev_enabled()) {
|
|
memcpy(setup, header, MIN(sizeof(header), setup_size));
|
|
}
|
|
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, prot_addr);
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, kernel_size);
|
|
fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, kernel, kernel_size);
|
|
sev_load_ctx.kernel_data = (char *)kernel;
|
|
sev_load_ctx.kernel_size = kernel_size;
|
|
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_ADDR, real_addr);
|
|
fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_SIZE, setup_size);
|
|
fw_cfg_add_bytes(fw_cfg, FW_CFG_SETUP_DATA, setup, setup_size);
|
|
sev_load_ctx.setup_data = (char *)setup;
|
|
sev_load_ctx.setup_size = setup_size;
|
|
|
|
if (sev_enabled()) {
|
|
sev_add_kernel_loader_hashes(&sev_load_ctx, &error_fatal);
|
|
}
|
|
|
|
option_rom[nb_option_roms].bootindex = 0;
|
|
option_rom[nb_option_roms].name = "linuxboot.bin";
|
|
if (linuxboot_dma_enabled && fw_cfg_dma_enabled(fw_cfg)) {
|
|
option_rom[nb_option_roms].name = "linuxboot_dma.bin";
|
|
}
|
|
nb_option_roms++;
|
|
}
|
|
|
|
void x86_isa_bios_init(MemoryRegion *isa_bios, MemoryRegion *isa_memory,
|
|
MemoryRegion *bios, bool read_only)
|
|
{
|
|
uint64_t bios_size = memory_region_size(bios);
|
|
uint64_t isa_bios_size = MIN(bios_size, 128 * KiB);
|
|
|
|
memory_region_init_alias(isa_bios, NULL, "isa-bios", bios,
|
|
bios_size - isa_bios_size, isa_bios_size);
|
|
memory_region_add_subregion_overlap(isa_memory, 1 * MiB - isa_bios_size,
|
|
isa_bios, 1);
|
|
memory_region_set_readonly(isa_bios, read_only);
|
|
}
|
|
|
|
void x86_bios_rom_init(X86MachineState *x86ms, const char *default_firmware,
|
|
MemoryRegion *rom_memory, bool isapc_ram_fw)
|
|
{
|
|
const char *bios_name;
|
|
char *filename;
|
|
int bios_size;
|
|
ssize_t ret;
|
|
|
|
/* BIOS load */
|
|
bios_name = MACHINE(x86ms)->firmware ?: default_firmware;
|
|
filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
|
|
if (filename) {
|
|
bios_size = get_image_size(filename);
|
|
} else {
|
|
bios_size = -1;
|
|
}
|
|
if (bios_size <= 0 ||
|
|
(bios_size % 65536) != 0) {
|
|
goto bios_error;
|
|
}
|
|
if (machine_require_guest_memfd(MACHINE(x86ms))) {
|
|
memory_region_init_ram_guest_memfd(&x86ms->bios, NULL, "pc.bios",
|
|
bios_size, &error_fatal);
|
|
} else {
|
|
memory_region_init_ram(&x86ms->bios, NULL, "pc.bios",
|
|
bios_size, &error_fatal);
|
|
}
|
|
if (sev_enabled()) {
|
|
/*
|
|
* The concept of a "reset" simply doesn't exist for
|
|
* confidential computing guests, we have to destroy and
|
|
* re-launch them instead. So there is no need to register
|
|
* the firmware as rom to properly re-initialize on reset.
|
|
* Just go for a straight file load instead.
|
|
*/
|
|
void *ptr = memory_region_get_ram_ptr(&x86ms->bios);
|
|
load_image_size(filename, ptr, bios_size);
|
|
x86_firmware_configure(0x100000000ULL - bios_size, ptr, bios_size);
|
|
} else {
|
|
memory_region_set_readonly(&x86ms->bios, !isapc_ram_fw);
|
|
ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
|
|
if (ret != 0) {
|
|
goto bios_error;
|
|
}
|
|
}
|
|
g_free(filename);
|
|
|
|
if (!machine_require_guest_memfd(MACHINE(x86ms))) {
|
|
/* map the last 128KB of the BIOS in ISA space */
|
|
x86_isa_bios_init(&x86ms->isa_bios, rom_memory, &x86ms->bios,
|
|
!isapc_ram_fw);
|
|
}
|
|
|
|
/* map all the bios at the top of memory */
|
|
memory_region_add_subregion(rom_memory,
|
|
(uint32_t)(-bios_size),
|
|
&x86ms->bios);
|
|
return;
|
|
|
|
bios_error:
|
|
fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
|
|
exit(1);
|
|
}
|