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Subject[PATCH 5.16 055/200] KVM: x86: Check .flags in kvm_cpuid_check_equal() too
Date
From: Vitaly Kuznetsov <vkuznets@redhat.com>

commit 033a3ea59a19df63edb4db6bfdbb357cd028258a upstream.

kvm_cpuid_check_equal() checks for the (full) equality of the supplied
CPUID data so .flags need to be checked too.

Reported-by: Sean Christopherson <seanjc@google.com>
Fixes: c6617c61e8fe ("KVM: x86: Partially allow KVM_SET_CPUID{,2} after KVM_RUN")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220126131804.2839410-1-vkuznets@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/kvm/cpuid.c | 1 +
1 file changed, 1 insertion(+)

--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -113,6 +113,7 @@ static int kvm_cpuid_check_equal(struct
orig = &vcpu->arch.cpuid_entries[i];
if (e2[i].function != orig->function ||
e2[i].index != orig->index ||
+ e2[i].flags != orig->flags ||
e2[i].eax != orig->eax || e2[i].ebx != orig->ebx ||
e2[i].ecx != orig->ecx || e2[i].edx != orig->edx)
return -EINVAL;

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