Reply-To: Sean Christopherson <seanjc@google.com>
Date:   Fri, 10 Mar 2023 13:42:23 -0800
In-Reply-To: <20230310214232.806108-1-seanjc@google.com>
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References: <20230310214232.806108-1-seanjc@google.com>
Message-ID: <20230310214232.806108-10-seanjc@google.com>
Subject: [PATCH v2 09/18] x86/virt: KVM: Open code cpu_has_vmx() in KVM VMX
From:   Sean Christopherson <seanjc@google.com>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        Sean Christopherson <seanjc@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>
Cc:     linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        Andrew Cooper <Andrew.Cooper3@citrix.com>,
        Kai Huang <kai.huang@intel.com>, Chao Gao <chao.gao@intel.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Fold the raw CPUID check for VMX into kvm_is_vmx_supported(), its sole
user.  Keep the check even though KVM also checks X86_FEATURE_VMX, as the
intent is to provide a unique error message if VMX is unsupported by
hardware, whereas X86_FEATURE_VMX may be clear due to firmware and/or
kernel actions.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/include/asm/virtext.h | 10 ----------
 arch/x86/kvm/vmx/vmx.c         |  2 +-
 2 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index aaed66249ccf..b1171a5ad452 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -22,14 +22,6 @@
 /*
  * VMX functions:
  */
-
-static inline int cpu_has_vmx(void)
-{
-	unsigned long ecx = cpuid_ecx(1);
-	return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
-}
-
-
 /**
  * cpu_vmxoff() - Disable VMX on the current CPU
  *
@@ -61,8 +53,6 @@ static inline int cpu_vmx_enabled(void)
 }
 
 /** Disable VMX if it is enabled on the current CPU
- *
- * You shouldn't call this if cpu_has_vmx() returns 0.
  */
 static inline void __cpu_emergency_vmxoff(void)
 {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 9e196b9fe183..58856e196536 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2747,7 +2747,7 @@ static bool kvm_is_vmx_supported(void)
 {
 	int cpu = raw_smp_processor_id();
 
-	if (!cpu_has_vmx()) {
+	if (!(cpuid_ecx(1) & feature_bit(VMX))) {
 		pr_err("VMX not supported by CPU %d\n", cpu);
 		return false;
 	}
-- 
2.40.0.rc1.284.g88254d51c5-goog