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KVM x86: Extend AMD specific guest behavior to Hygon virtual CPUs

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Extend guest_cpuid_is_amd() to cover Hygon virtual CPUs and rename it
accordingly.  Hygon CPUs use an AMD-based core and so have the same
basic behavior as AMD CPUs.

Fixes: b8f4abb652 ("x86/kvm: Add Hygon Dhyana support to KVM")
Cc: Pu Wen <puwen@hygon.cn>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-03-04 17:34:33 -08:00 committed by Paolo Bonzini
parent 15608ed03f
commit 23493d0a17
4 changed files with 8 additions and 5 deletions
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2
arch/x86/kvm/cpuid.c
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@ -946,7 +946,7 @@ bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
* requested. AMD CPUID semantics returns all zeroes for any
* undefined leaf, whether or not the leaf is in range.
*/
if (!entry && check_limit && !guest_cpuid_is_amd(vcpu) &&
if (!entry && check_limit && !guest_cpuid_is_amd_or_hygon(vcpu) &&
!cpuid_function_in_range(vcpu, function)) {
max = kvm_find_cpuid_entry(vcpu, 0, 0);
if (max) {

6
arch/x86/kvm/cpuid.h
View File

@ -214,12 +214,14 @@ static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
*reg &= ~__feature_bit(x86_feature);
}
static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
best = kvm_find_cpuid_entry(vcpu, 0, 0);
return best && is_guest_vendor_amd(best->ebx, best->ecx, best->edx);
return best &&
(is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
}
static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)

3
arch/x86/kvm/mmu/mmu.c
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@ -4510,7 +4510,8 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
cpuid_maxphyaddr(vcpu), context->root_level,
context->nx,
guest_cpuid_has(vcpu, X86_FEATURE_GBPAGES),
is_pse(vcpu), guest_cpuid_is_amd(vcpu));
is_pse(vcpu),
guest_cpuid_is_amd_or_hygon(vcpu));
}
static void

2
arch/x86/kvm/x86.c
View File

@ -2550,7 +2550,7 @@ static void kvmclock_sync_fn(struct work_struct *work)
static bool can_set_mci_status(struct kvm_vcpu *vcpu)
{
/* McStatusWrEn enabled? */
if (guest_cpuid_is_amd(vcpu))
if (guest_cpuid_is_amd_or_hygon(vcpu))
return !!(vcpu->arch.msr_hwcr & BIT_ULL(18));
return false;