When I boot kernel, the dmesg will print the following message:
[Firmware Bug]: CPU1: APIC id mismatch. Firmware: 1 APIC: 30
Fix this by setting up correct initial_apicid to cpu_id.
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
x86/cpuid.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/x86/cpuid.c b/x86/cpuid.c
index c3b67d9..aa213d5 100644
--- a/x86/cpuid.c
+++ b/x86/cpuid.c
@@ -8,7 +8,7 @@
#define MAX_KVM_CPUID_ENTRIES 100
-static void filter_cpuid(struct kvm_cpuid2 *kvm_cpuid)
+static void filter_cpuid(struct kvm_cpuid2 *kvm_cpuid, int cpu_id)
{
unsigned int signature[3];
unsigned int i;
@@ -28,6 +28,8 @@ static void filter_cpuid(struct kvm_cpuid2 *kvm_cpuid)
entry->edx = signature[2];
break;
case 1:
+ entry->ebx &= ~(0xff << 24);
+ entry->ebx |= cpu_id << 24;
/* Set X86_FEATURE_HYPERVISOR */
if (entry->index == 0)
entry->ecx |= (1 << 31);
@@ -80,7 +82,7 @@ void kvm_cpu__setup_cpuid(struct kvm_cpu *vcpu)
if (ioctl(vcpu->kvm->sys_fd, KVM_GET_SUPPORTED_CPUID, kvm_cpuid) < 0)
die_perror("KVM_GET_SUPPORTED_CPUID failed");
- filter_cpuid(kvm_cpuid);
+ filter_cpuid(kvm_cpuid, vcpu->cpu_id);
if (ioctl(vcpu->vcpu_fd, KVM_SET_CPUID2, kvm_cpuid) < 0)
die_perror("KVM_SET_CPUID2 failed");
--
2.11.0
