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

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: b8f4abb652146 ("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>

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index a25b520..ec91b9b 100644 (file)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -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) {

diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index cccfd85..a098860 100644 (file)
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -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)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 5545469..f1eb2d3 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -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

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 96e897d..cda0b78 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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;