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[hv] set ECX.bit31 to indicate the presence of a hypervisor 

ECS.bit31 is not used and always return 0 in SDM Vol.2A 3-195. It's a
standard way to indicate whether there is a hypervisor.

Tracked-On: #2490
Ref: https://lwn.net/Articles/301888/
Signed-off-by: Xinyun Liu <xinyun.liu@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Xinyun Liu 2019-02-28 08:44:14 +08:00 committed by wenlingz
parent f6758fd621
commit 0943a836bd
2 changed files with 4 additions and 0 deletions
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3
hypervisor/arch/x86/guest/vcpuid.c
View File

@ -345,6 +345,9 @@ void guest_cpuid(struct acrn_vcpu *vcpu, uint32_t *eax, uint32_t *ebx, uint32_t
/*mask vmx to guest os */ /*mask vmx to guest os */
*ecx &= ~CPUID_ECX_VMX; *ecx &= ~CPUID_ECX_VMX;
/* set Hypervisor Present Bit */
*ecx |= CPUID_ECX_HV;
/*no xsave support for guest if it is not enabled on host*/ /*no xsave support for guest if it is not enabled on host*/
if ((*ecx & CPUID_ECX_OSXSAVE) == 0U) { if ((*ecx & CPUID_ECX_OSXSAVE) == 0U) {
*ecx &= ~CPUID_ECX_XSAVE; *ecx &= ~CPUID_ECX_XSAVE;

1
hypervisor/include/arch/x86/cpuid.h
View File

@ -41,6 +41,7 @@
#define CPUID_ECX_XSAVE (1U<<26U) #define CPUID_ECX_XSAVE (1U<<26U)
#define CPUID_ECX_OSXSAVE (1U<<27U) #define CPUID_ECX_OSXSAVE (1U<<27U)
#define CPUID_ECX_AVX (1U<<28U) #define CPUID_ECX_AVX (1U<<28U)
#define CPUID_ECX_HV (1U<<31U)
#define CPUID_EDX_FPU (1U<<0U) #define CPUID_EDX_FPU (1U<<0U)
#define CPUID_EDX_VME (1U<<1U) #define CPUID_EDX_VME (1U<<1U)
#define CPUID_EDX_DE (1U<<2U) #define CPUID_EDX_DE (1U<<2U)