The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
18e897d213cb ("KVM: VMX: Fold vmx_supported_debugctl() into vcpu_supported_debugctl()") 2f4073e08f4c ("KVM: VMX: Enable Notify VM exit") 938c8745bcf2 ("KVM: x86: Introduce "struct kvm_caps" to track misc caps/settings") ed2351174e38 ("KVM: x86: Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault") 35875316384b ("KVM: x86: Allow userspace to set maximum VCPU id for VM") e9bf3acb23f0 ("KVM: s390: Add KVM_CAP_S390_PROTECTED_DUMP") 8aba09588d2a ("KVM: s390: Add CPU dump functionality") 0460eb35b443 ("KVM: s390: Add configuration dump functionality") 35d02493dba1 ("KVM: s390: pv: Add query interface") 47e8eec83262 ("Merge tag 'kvmarm-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 18e897d213cb152c786abab14919196bd9dc3a9f Mon Sep 17 00:00:00 2001 From: Sean Christopherson seanjc@google.com Date: Thu, 6 Oct 2022 00:03:09 +0000 Subject: [PATCH] KVM: VMX: Fold vmx_supported_debugctl() into vcpu_supported_debugctl()
Fold vmx_supported_debugctl() into vcpu_supported_debugctl(), its only caller. Setting bits only to clear them a few instructions later is rather silly, and splitting the logic makes things seem more complicated than they actually are.
Opportunistically drop DEBUGCTLMSR_LBR_MASK now that there's a single reference to the pair of bits. The extra layer of indirection provides no meaningful value and makes it unnecessarily tedious to understand what KVM is doing.
No functional change.
Signed-off-by: Sean Christopherson seanjc@google.com Message-Id: 20221006000314.73240-4-seanjc@google.com Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini pbonzini@redhat.com
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h index 3bd7a8970618..07254314f3dd 100644 --- a/arch/x86/kvm/vmx/capabilities.h +++ b/arch/x86/kvm/vmx/capabilities.h @@ -24,8 +24,6 @@ extern int __read_mostly pt_mode; #define PMU_CAP_FW_WRITES (1ULL << 13) #define PMU_CAP_LBR_FMT 0x3f
-#define DEBUGCTLMSR_LBR_MASK (DEBUGCTLMSR_LBR | DEBUGCTLMSR_FREEZE_LBRS_ON_PMI) - struct nested_vmx_msrs { /* * We only store the "true" versions of the VMX capability MSRs. We @@ -421,19 +419,6 @@ static inline u64 vmx_get_perf_capabilities(void) return perf_cap; }
-static inline u64 vmx_supported_debugctl(void) -{ - u64 debugctl = 0; - - if (boot_cpu_has(X86_FEATURE_BUS_LOCK_DETECT)) - debugctl |= DEBUGCTLMSR_BUS_LOCK_DETECT; - - if (vmx_get_perf_capabilities() & PMU_CAP_LBR_FMT) - debugctl |= DEBUGCTLMSR_LBR_MASK; - - return debugctl; -} - static inline bool cpu_has_notify_vmexit(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 65f092e4a81b..981b38355066 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2023,13 +2023,15 @@ static u64 nested_vmx_truncate_sysenter_addr(struct kvm_vcpu *vcpu,
static u64 vcpu_supported_debugctl(struct kvm_vcpu *vcpu) { - u64 debugctl = vmx_supported_debugctl(); + u64 debugctl = 0;
- if (!intel_pmu_lbr_is_enabled(vcpu)) - debugctl &= ~DEBUGCTLMSR_LBR_MASK; + if (boot_cpu_has(X86_FEATURE_BUS_LOCK_DETECT) && + guest_cpuid_has(vcpu, X86_FEATURE_BUS_LOCK_DETECT)) + debugctl |= DEBUGCTLMSR_BUS_LOCK_DETECT;
- if (!guest_cpuid_has(vcpu, X86_FEATURE_BUS_LOCK_DETECT)) - debugctl &= ~DEBUGCTLMSR_BUS_LOCK_DETECT; + if ((vmx_get_perf_capabilities() & PMU_CAP_LBR_FMT) && + intel_pmu_lbr_is_enabled(vcpu)) + debugctl |= DEBUGCTLMSR_LBR | DEBUGCTLMSR_FREEZE_LBRS_ON_PMI;
return debugctl; }