From: Jim Mattson <jmattson@google.com>
Date: Thu, 22 Sep 2022 23:18:54 +0000 (-0700)
Subject: KVM: x86: Hide IA32_PLATFORM_DCA_CAP[31:0] from the guest
X-Git-Tag: v6.6-pxa1908~2918^2~2
X-Git-Url: https://git.dujemihanovic.xyz/?a=commitdiff_plain;h=aae2e72229cdb21f90df2dbe4244c977e5d3265b;p=linux.git

KVM: x86: Hide IA32_PLATFORM_DCA_CAP[31:0] from the guest

The only thing reported by CPUID.9 is the value of
IA32_PLATFORM_DCA_CAP[31:0] in EAX. This MSR doesn't even exist in the
guest, since CPUID.1:ECX.DCA[bit 18] is clear in the guest.

Clear CPUID.9 in KVM_GET_SUPPORTED_CPUID.

Fixes: 24c82e576b78 ("KVM: Sanitize cpuid")
Signed-off-by: Jim Mattson <jmattson@google.com>
Message-Id: <20220922231854.249383-1-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 4c1c2c06e96b..2796dde06302 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -902,8 +902,6 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 			entry->edx = 0;
 		}
 		break;
-	case 9:
-		break;
 	case 0xa: { /* Architectural Performance Monitoring */
 		union cpuid10_eax eax;
 		union cpuid10_edx edx;