[PATCH 02/18] KVM: x86: hyper-v: Introduce helpers to check if VSM is exposed to guest
From: Nicolas Saenz Julienne <hidden>
Date: 2024-06-09 15:51:35
Also in:
kvm, linux-arch, linux-doc, linux-hyperv, lkml
Subsystem:
generic include/asm header files, kernel virtual machine for x86 (kvm/x86), kvm x86 hyper-v (kvm/hyper-v), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Arnd Bergmann, Sean Christopherson, Paolo Bonzini, Vitaly Kuznetsov, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Introduce a helper function to check if the guest exposes the VSM CPUID bit. Signed-off-by: Nicolas Saenz Julienne <redacted> --- arch/x86/kvm/hyperv.h | 10 ++++++++++ include/asm-generic/hyperv-tlfs.h | 1 + 2 files changed, 11 insertions(+)
diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
index 923e64903da9a..d007d2203e0e4 100644
--- a/arch/x86/kvm/hyperv.h
+++ b/arch/x86/kvm/hyperv.h@@ -265,6 +265,12 @@ static inline void kvm_hv_nested_transtion_tlb_flush(struct kvm_vcpu *vcpu, } int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu); +static inline bool kvm_hv_cpuid_vsm_enabled(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + return hv_vcpu && (hv_vcpu->cpuid_cache.features_ebx & HV_ACCESS_VSM); +} #else /* CONFIG_KVM_HYPERV */ static inline void kvm_hv_setup_tsc_page(struct kvm *kvm, struct pvclock_vcpu_time_info *hv_clock) {}
@@ -322,6 +328,10 @@ static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu) return vcpu->vcpu_idx; } static inline void kvm_hv_nested_transtion_tlb_flush(struct kvm_vcpu *vcpu, bool tdp_enabled) {} +static inline bool kvm_hv_cpuid_vsm_enabled(struct kvm_vcpu *vcpu) +{ + return false; +} #endif /* CONFIG_KVM_HYPERV */ #endif /* __ARCH_X86_KVM_HYPERV_H__ */
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index 814207e7c37fc..ffac04bbd0c19 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h@@ -89,6 +89,7 @@ #define HV_ACCESS_STATS BIT(8) #define HV_DEBUGGING BIT(11) #define HV_CPU_MANAGEMENT BIT(12) +#define HV_ACCESS_VSM BIT(16) #define HV_ENABLE_EXTENDED_HYPERCALLS BIT(20) #define HV_ISOLATION BIT(22)
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2.40.1