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[QEMU PATCH] x86: Set maximum APIC ID to KVM prior to vCPU creation
From: |
Zeng Guang |
Subject: |
[QEMU PATCH] x86: Set maximum APIC ID to KVM prior to vCPU creation |
Date: |
Fri, 20 May 2022 14:39:28 +0800 |
Specify maximum possible APIC ID assigned for current VM session prior to
the creation of vCPUs. KVM need set up VM-scoped data structure indexed by
the APIC ID, e.g. Posted-Interrupt Descriptor table to support Intel IPI
virtualization.
It can be achieved by calling KVM_ENABLE_CAP for KVM_CAP_MAX_VCPU_ID
capability once KVM has already enabled it. Otherwise, simply prompts
that KVM doesn't support this capability yet.
Signed-off-by: Zeng Guang <guang.zeng@intel.com>
---
hw/i386/x86.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 4cf107baea..ff74492325 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -106,7 +106,7 @@ out:
void x86_cpus_init(X86MachineState *x86ms, int default_cpu_version)
{
- int i;
+ int i, ret;
const CPUArchIdList *possible_cpus;
MachineState *ms = MACHINE(x86ms);
MachineClass *mc = MACHINE_GET_CLASS(x86ms);
@@ -123,6 +123,13 @@ void x86_cpus_init(X86MachineState *x86ms, int
default_cpu_version)
*/
x86ms->apic_id_limit = x86_cpu_apic_id_from_index(x86ms,
ms->smp.max_cpus - 1) +
1;
+
+ ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_MAX_VCPU_ID,
+ 0, x86ms->apic_id_limit);
+ if (ret < 0) {
+ error_report("kvm: Set max vcpu id not supported: %s", strerror(-ret));
+ }
+
possible_cpus = mc->possible_cpu_arch_ids(ms);
for (i = 0; i < ms->smp.cpus; i++) {
x86_cpu_new(x86ms, possible_cpus->cpus[i].arch_id, &error_fatal);
--
2.27.0
- [QEMU PATCH] x86: Set maximum APIC ID to KVM prior to vCPU creation,
Zeng Guang <=