From 76ab8161083bfd0ae4de9b93e68d639da6e1c726 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 21 Jul 2023 13:18:56 -0700 Subject: [PATCH] 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. Reviewed-by: Kai Huang Link: https://lore.kernel.org/r/20230721201859.2307736-17-seanjc@google.com Signed-off-by: Sean Christopherson --- arch/x86/include/asm/virtext.h | 50 ------------------------------------------ arch/x86/kvm/svm/svm.c | 29 ++++++++++++++++++++---- 2 files changed, 25 insertions(+), 54 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 632575e..0000000 --- a/arch/x86/include/asm/virtext.h +++ /dev/null @@ -1,50 +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 - * - * 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 - -#include -#include -#include - -/* - * 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 to ensure INIT and NMI - * aren't blocked, e.g. if a fatal error occurred between CLGI - * and STGI. Note, STGI may #UD if SVM is disabled from NMI - * context between reading EFER and executing STGI. In that - * case, GIF must already be set, otherwise the NMI would have - * been blocked, so just eat the fault. - */ - 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 9e44916..47f9c71 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -42,8 +42,6 @@ #include #include -#include - #include #include "trace.h" @@ -582,9 +580,32 @@ out: 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 to ensure INIT and NMI + * aren't blocked, e.g. if a fatal error occurred between CLGI + * and STGI. Note, STGI may #UD if SVM is disabled from NMI + * context between reading EFER and executing STGI. In that + * case, GIF must already be set, otherwise the NMI would have + * been blocked, so just eat the fault. + */ + 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) @@ -593,7 +614,7 @@ 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(); } -- 2.7.4