From e126f71f00da735367ca626d7307fa1ef691e73e Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Mon, 14 Nov 2022 12:44:01 +0100 Subject: [PATCH] x86/cpu: Restore AMD's DE_CFG MSR after resume commit 2632daebafd04746b4b96c2f26a6021bc38f6209 upstream. DE_CFG contains the LFENCE serializing bit, restore it on resume too. This is relevant to older families due to the way how they do S3. Unify and correct naming while at it. Fixes: e4d0e84e4907 ("x86/cpu/AMD: Make LFENCE a serializing instruction") Reported-by: Andrew Cooper Reported-by: Pawan Gupta Signed-off-by: Borislav Petkov Cc: Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- arch/x86/include/asm/msr-index.h | 8 +++++--- arch/x86/kernel/cpu/amd.c | 10 ++++------ arch/x86/kvm/svm.c | 10 +++++----- arch/x86/kvm/x86.c | 2 +- arch/x86/power/cpu.c | 1 + 5 files changed, 16 insertions(+), 15 deletions(-) diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 5131146e1bd8..aafd1747cae6 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -364,6 +364,11 @@ #define MSR_AMD64_OSVW_STATUS 0xc0010141 #define MSR_AMD64_LS_CFG 0xc0011020 #define MSR_AMD64_DC_CFG 0xc0011022 + +#define MSR_AMD64_DE_CFG 0xc0011029 +#define MSR_AMD64_DE_CFG_LFENCE_SERIALIZE_BIT 1 +#define MSR_AMD64_DE_CFG_LFENCE_SERIALIZE BIT_ULL(MSR_AMD64_DE_CFG_LFENCE_SERIALIZE_BIT) + #define MSR_AMD64_BU_CFG2 0xc001102a #define MSR_AMD64_IBSFETCHCTL 0xc0011030 #define MSR_AMD64_IBSFETCHLINAD 0xc0011031 @@ -414,9 +419,6 @@ #define FAM10H_MMIO_CONF_BASE_MASK 0xfffffffULL #define FAM10H_MMIO_CONF_BASE_SHIFT 20 #define MSR_FAM10H_NODE_ID 0xc001100c -#define MSR_F10H_DECFG 0xc0011029 -#define MSR_F10H_DECFG_LFENCE_SERIALIZE_BIT 1 -#define MSR_F10H_DECFG_LFENCE_SERIALIZE BIT_ULL(MSR_F10H_DECFG_LFENCE_SERIALIZE_BIT) /* K8 MSRs */ #define MSR_K8_TOP_MEM1 0xc001001a diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 9428b54fff66..13915fdbb4c9 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -735,8 +735,6 @@ static void init_amd_gh(struct cpuinfo_x86 *c) set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH); } -#define MSR_AMD64_DE_CFG 0xC0011029 - static void init_amd_ln(struct cpuinfo_x86 *c) { /* @@ -898,16 +896,16 @@ static void init_amd(struct cpuinfo_x86 *c) * msr_set_bit() uses the safe accessors, too, even if the MSR * is not present. */ - msr_set_bit(MSR_F10H_DECFG, - MSR_F10H_DECFG_LFENCE_SERIALIZE_BIT); + msr_set_bit(MSR_AMD64_DE_CFG, + MSR_AMD64_DE_CFG_LFENCE_SERIALIZE_BIT); /* * Verify that the MSR write was successful (could be running * under a hypervisor) and only then assume that LFENCE is * serializing. */ - ret = rdmsrl_safe(MSR_F10H_DECFG, &val); - if (!ret && (val & MSR_F10H_DECFG_LFENCE_SERIALIZE)) { + ret = rdmsrl_safe(MSR_AMD64_DE_CFG, &val); + if (!ret && (val & MSR_AMD64_DE_CFG_LFENCE_SERIALIZE_BIT)) { /* A serializing LFENCE stops RDTSC speculation */ set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC); } else { diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index c8e18144ecf2..1556c55a0909 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -3528,9 +3528,9 @@ static int svm_get_msr_feature(struct kvm_msr_entry *msr) msr->data = 0; switch (msr->index) { - case MSR_F10H_DECFG: - if (boot_cpu_has(X86_FEATURE_LFENCE_RDTSC)) - msr->data |= MSR_F10H_DECFG_LFENCE_SERIALIZE; + case MSR_AMD64_DE_CFG: + if (cpu_feature_enabled(X86_FEATURE_LFENCE_RDTSC)) + msr->data |= MSR_AMD64_DE_CFG_LFENCE_SERIALIZE; break; default: return 1; @@ -3638,7 +3638,7 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) msr_info->data = 0x1E; } break; - case MSR_F10H_DECFG: + case MSR_AMD64_DE_CFG: msr_info->data = svm->msr_decfg; break; default: @@ -3829,7 +3829,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) case MSR_VM_IGNNE: vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data); break; - case MSR_F10H_DECFG: { + case MSR_AMD64_DE_CFG: { struct kvm_msr_entry msr_entry; msr_entry.index = msr->index; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 78c1838b9fff..007dc3298f88 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1026,7 +1026,7 @@ static unsigned num_emulated_msrs; * can be used by a hypervisor to validate requested CPU features. */ static u32 msr_based_features[] = { - MSR_F10H_DECFG, + MSR_AMD64_DE_CFG, MSR_IA32_UCODE_REV, MSR_IA32_ARCH_CAPABILITIES, }; diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c index a1fbf18eed5a..4c073926ab93 100644 --- a/arch/x86/power/cpu.c +++ b/arch/x86/power/cpu.c @@ -526,6 +526,7 @@ static void pm_save_spec_msr(void) MSR_TSX_FORCE_ABORT, MSR_IA32_MCU_OPT_CTRL, MSR_AMD64_LS_CFG, + MSR_AMD64_DE_CFG, }; msr_build_context(spec_msr_id, ARRAY_SIZE(spec_msr_id));