From: Sean Christopherson <sean.j.christopherson@intel.com>
Date: Wed, 4 Mar 2020 17:34:33 -0800
Subject: KVM x86: Extend AMD specific guest behavior to Hygon virtual CPUs
Git-commit: 23493d0a1731205a4bccaa0e283da642ca6f6e29
Patch-mainline: v5.7-rc1
References: bsc#1183447

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>
Acked-by: Dario Faggioli <dfaggioli@suse.com>
---
 arch/x86/kvm/cpuid.c   | 2 +-
 arch/x86/kvm/cpuid.h   | 6 ++++--
 arch/x86/kvm/mmu/mmu.c | 3 ++-
 arch/x86/kvm/x86.c     | 2 +-
 4 files changed, 8 insertions(+), 5 deletions(-)

--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -1000,7 +1000,7 @@
 	 * 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) {
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -113,12 +113,14 @@
 		*reg &= ~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)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2427,7 +2427,7 @@
 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;
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4553,7 +4553,8 @@
 				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