[PATCH v2 3/3] x86/virt: Fold __cpu_emergency_vmxoff() into its sole caller

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
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	linux-kernel@vger.kernel.org,
	"Guilherme G . Piccoli" <gpiccoli@igalia.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>
Subject: [PATCH v2 3/3] x86/virt: Fold __cpu_emergency_vmxoff() into its sole caller
Date: Wed, 18 May 2022 00:16:47 +0000	[thread overview]
Message-ID: <20220518001647.1291448-4-seanjc@google.com> (raw)
In-Reply-To: <20220518001647.1291448-1-seanjc@google.com>

Fold __cpu_emergency_vmxoff() into cpu_emergency_vmxoff(), its sole
remaining caller, to discourage crash/emergency code from handling VMX
but not SVM.  The behavior of VMX and SVM is so similar that it's highly
unlikely that there will be a scenario where VMX needs to be disabled,
but SVM can be left enabled.  In other words, during a crash and/or
emergency reboot, funnel all virtualization teardown sequences through
cpu_crash_disable_virtualization().

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/include/asm/virtext.h | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 8757078d4442..a9414ef5269e 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -60,22 +60,12 @@ static inline int cpu_vmx_enabled(void)
 	return __read_cr4() & X86_CR4_VMXE;
 }
 
-/** 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)
-{
-	if (cpu_vmx_enabled())
-		cpu_vmxoff();
-}
-
 /** Disable VMX if it is supported and enabled on the current CPU
  */
 static inline void cpu_emergency_vmxoff(void)
 {
-	if (cpu_has_vmx())
-		__cpu_emergency_vmxoff();
+	if (cpu_has_vmx() && cpu_vmx_enabled())
+		cpu_vmxoff();
 }
 
 
-- 
2.36.0.550.gb090851708-goog

