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

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[ Upstream commit aae2e72229 ]

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: 24c82e576b ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jim Mattson 2022-09-22 16:18:54 -07:00 • committed by Greg Kroah-Hartman
commit 374d4c3075
1 changed files with 0 additions and 2 deletions
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arch/x86/kvm/cpuid.c
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@ -661,8 +661,6 @@ 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 */
struct x86_pmu_capability cap;
union cpuid10_eax eax;