diff mbox series

[v2,34/49] KVM: x86: Advertise HYPERVISOR in KVM_GET_SUPPORTED_CPUID

Message ID 20240517173926.965351-35-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: CPUID overhaul, fixes, and caching | expand

Commit Message

Sean Christopherson May 17, 2024, 5:39 p.m. UTC 
Unconditionally advertise "support" for the HYPERVISOR feature in CPUID,
as the flag simply communicates to the guest that's it's running under a
hypervisor.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/cpuid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

Maxim Levitsky July 5, 2024, 2:04 a.m. UTC | #1 
On Fri, 2024-05-17 at 10:39 -0700, Sean Christopherson wrote:
> Unconditionally advertise "support" for the HYPERVISOR feature in CPUID,
> as the flag simply communicates to the guest that's it's running under a
> hypervisor.
> 
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  arch/x86/kvm/cpuid.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index d1f427284ccc..de898d571faa 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -681,7 +681,8 @@ void kvm_set_cpu_caps(void)
>  		F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) |
>  		F(XMM4_2) | EMUL_F(X2APIC) | F(MOVBE) | F(POPCNT) |
>  		EMUL_F(TSC_DEADLINE_TIMER) | F(AES) | F(XSAVE) |
> -		0 /* OSXSAVE */ | F(AVX) | F(F16C) | F(RDRAND)
> +		0 /* OSXSAVE */ | F(AVX) | F(F16C) | F(RDRAND) |
> +		EMUL_F(HYPERVISOR)
>  	);
>  
>  	kvm_cpu_cap_init(CPUID_1_EDX,

This makes sense.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
	Maxim Levitsky
diff mbox series

Patch

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index d1f427284ccc..de898d571faa 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -681,7 +681,8 @@  void kvm_set_cpu_caps(void)
 		F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) |
 		F(XMM4_2) | EMUL_F(X2APIC) | F(MOVBE) | F(POPCNT) |
 		EMUL_F(TSC_DEADLINE_TIMER) | F(AES) | F(XSAVE) |
-		0 /* OSXSAVE */ | F(AVX) | F(F16C) | F(RDRAND)
+		0 /* OSXSAVE */ | F(AVX) | F(F16C) | F(RDRAND) |
+		EMUL_F(HYPERVISOR)
 	);
 
 	kvm_cpu_cap_init(CPUID_1_EDX,