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Reply-To: Sean Christopherson <seanjc@google.com>
Date: Fri, 17 May 2024 10:39:19 -0700
In-Reply-To: <20240517173926.965351-1-seanjc@google.com>
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Subject: [PATCH v2 42/49] KVM: x86: Drop unnecessary check that
 cpuid_entry2_find() returns right leaf
From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>, Sean Christopherson <seanjc@google.com>, 
	Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, 
	Hou Wenlong <houwenlong.hwl@antgroup.com>, Kechen Lu <kechenl@nvidia.com>, 
	Oliver Upton <oliver.upton@linux.dev>, Maxim Levitsky <mlevitsk@redhat.com>, 
	Binbin Wu <binbin.wu@linux.intel.com>, Yang Weijiang <weijiang.yang@intel.com>, 
	Robert Hoo <robert.hoo.linux@gmail.com>
Content-Type: text/plain; charset="UTF-8"

Drop an unnecessary check that kvm_find_cpuid_entry_index(), i.e.
cpuid_entry2_find(), returns the correct leaf when getting CPUID.0x7.0x0
to update X86_FEATURE_OSPKE.  cpuid_entry2_find() never returns an entry
for the wrong function.  And not that it matters, but cpuid_entry2_find()
will always return a precise match for CPUID.0x7.0x0 since the index is
significant.

No functional change intended.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 258c5fce87fc..8256fc657c6b 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -351,7 +351,7 @@ void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu)
 	}
 
 	best = kvm_find_cpuid_entry_index(vcpu, 7, 0);
-	if (best && boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7)
+	if (best && boot_cpu_has(X86_FEATURE_PKU))
 		cpuid_entry_change(best, X86_FEATURE_OSPKE,
 				   kvm_is_cr4_bit_set(vcpu, X86_CR4_PKE));
 
-- 
2.45.0.215.g3402c0e53f-goog