linux-kernel - [PATCH 14/16] x86/virt: KVM: Move "disable SVM" helper into KVM SVM

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Message-ID: <20221201232655.290720-15-seanjc@google.com>
Date:   Thu,  1 Dec 2022 23:26:53 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Andrew Cooper <Andrew.Cooper3@...rix.com>
Subject: [PATCH 14/16] x86/virt: KVM: Move "disable SVM" helper into KVM SVM

Move cpu_svm_disable() into KVM proper now that all hardware
virtualization management is routed through KVM.  Remove the now-empty
virtext.h.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/include/asm/virtext.h | 47 ----------------------------------
 arch/x86/kvm/svm/svm.c         | 25 +++++++++++++++---
 2 files changed, 22 insertions(+), 50 deletions(-)
 delete mode 100644 arch/x86/include/asm/virtext.h

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
deleted file mode 100644
index 683d20411335..000000000000
--- a/arch/x86/include/asm/virtext.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/* CPU virtualization extensions handling
- *
- * This should carry the code for handling CPU virtualization extensions
- * that needs to live in the kernel core.
- *
- * Author: Eduardo Habkost <ehabkost@...hat.com>
- *
- * Copyright (C) 2008, Red Hat Inc.
- *
- * Contains code from KVM, Copyright (C) 2006 Qumranet, Inc.
- */
-#ifndef _ASM_X86_VIRTEX_H
-#define _ASM_X86_VIRTEX_H
-
-#include <asm/processor.h>
-
-#include <asm/vmx.h>
-#include <asm/svm.h>
-#include <asm/tlbflush.h>
-
-/*
- * SVM functions:
- */
-/** Disable SVM on the current CPU
- */
-static inline void cpu_svm_disable(void)
-{
-	uint64_t efer;
-
-	wrmsrl(MSR_VM_HSAVE_PA, 0);
-	rdmsrl(MSR_EFER, efer);
-	if (efer & EFER_SVME) {
-		/*
-		 * Force GIF=1 prior to disabling SVM, e.g. to ensure INIT and
-		 * NMI aren't blocked.  Eat faults on STGI, as it #UDs if SVM
-		 * isn't enabled and SVM can be disabled by an NMI callback.
-		 */
-		asm_volatile_goto("1: stgi\n\t"
-				  _ASM_EXTABLE(1b, %l[fault])
-				  ::: "memory" : fault);
-fault:
-		wrmsrl(MSR_EFER, efer & ~EFER_SVME);
-	}
-}
-
-#endif /* _ASM_X86_VIRTEX_H */
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index ba281651dee4..2aec27b34487 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -41,7 +41,6 @@
 #include <asm/reboot.h>
 #include <asm/fpu/api.h>
 
-#include <asm/virtext.h>
 #include "trace.h"
 
 #include "svm.h"
@@ -571,9 +570,29 @@ void __svm_write_tsc_multiplier(u64 multiplier)
 	preempt_enable();
 }
 
+static inline void kvm_cpu_svm_disable(void)
+{
+	uint64_t efer;
+
+	wrmsrl(MSR_VM_HSAVE_PA, 0);
+	rdmsrl(MSR_EFER, efer);
+	if (efer & EFER_SVME) {
+		/*
+		 * Force GIF=1 prior to disabling SVM, e.g. to ensure INIT and
+		 * NMI aren't blocked.  Eat faults on STGI, as it #UDs if SVM
+		 * isn't enabled and SVM can be disabled by an NMI callback.
+		 */
+		asm_volatile_goto("1: stgi\n\t"
+				  _ASM_EXTABLE(1b, %l[fault])
+				  ::: "memory" : fault);
+fault:
+		wrmsrl(MSR_EFER, efer & ~EFER_SVME);
+	}
+}
+
 static void svm_emergency_disable(void)
 {
-	cpu_svm_disable();
+	kvm_cpu_svm_disable();
 }
 
 static void svm_hardware_disable(void)
@@ -582,7 +601,7 @@ static void svm_hardware_disable(void)
 	if (tsc_scaling)
 		__svm_write_tsc_multiplier(SVM_TSC_RATIO_DEFAULT);
 
-	cpu_svm_disable();
+	kvm_cpu_svm_disable();
 
 	amd_pmu_disable_virt();
 }
-- 
2.39.0.rc0.267.gcb52ba06e7-goog