diff options
| author | Oliver Upton <oupton@google.com> | 2020-02-28 00:59:04 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-16 17:57:35 +0100 |
| commit | cc7f5577adfc766de8613b71e9ae52c053fcca01 (patch) | |
| tree | bf8b7b9e5fbe9f57d8f2e6cdd99db3b7109d350d /arch/x86/include/asm | |
| parent | 4d395762599dbab1eb29d9011d5b75ca3cc4f70a (diff) | |
KVM: SVM: Inhibit APIC virtualization for X2APIC guest
The AVIC does not support guest use of the x2APIC interface. Currently,
KVM simply chooses to squash the x2APIC feature in the guest's CPUID
If the AVIC is enabled. Doing so prevents KVM from running a guest
with greater than 255 vCPUs, as such a guest necessitates the use
of the x2APIC interface.
Instead, inhibit AVIC enablement on a per-VM basis whenever the x2APIC
feature is set in the guest's CPUID.
Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 5edf6425c747..f58861e2ece5 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -886,6 +886,7 @@ enum kvm_irqchip_mode { #define APICV_INHIBIT_REASON_NESTED 2 #define APICV_INHIBIT_REASON_IRQWIN 3 #define APICV_INHIBIT_REASON_PIT_REINJ 4 +#define APICV_INHIBIT_REASON_X2APIC 5 struct kvm_arch { unsigned long n_used_mmu_pages; |