diff options
| author | Vineeth Pillai <viremana@linux.microsoft.com> | 2021-06-03 15:14:39 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-06-17 13:09:37 -0400 |
| commit | c4327f15dfc7294b2abde0ea49b3e43eec3cca38 (patch) | |
| tree | 40c4da6a0f90aee735567efe05a003a548a4bd74 /arch/x86/kvm/svm/svm_onhyperv.h | |
| parent | 1e0c7d40758bcd45b4af936031144e995f87a7f6 (diff) | |
KVM: SVM: hyper-v: Enlightened MSR-Bitmap support
Enlightened MSR-Bitmap as per TLFS:
"The L1 hypervisor may collaborate with the L0 hypervisor to make MSR
accesses more efficient. It can enable enlightened MSR bitmaps by setting
the corresponding field in the enlightened VMCS to 1. When enabled, L0
hypervisor does not monitor the MSR bitmaps for changes. Instead, the L1
hypervisor must invalidate the corresponding clean field after making
changes to one of the MSR bitmaps."
Enable this for SVM.
Related VMX changes:
commit ceef7d10dfb6 ("KVM: x86: VMX: hyper-v: Enlightened MSR-Bitmap support")
Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
Message-Id: <87df0710f95d28b91cc4ea014fc4d71056eebbee.1622730232.git.viremana@linux.microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm_onhyperv.h')
| -rw-r--r-- | arch/x86/kvm/svm/svm_onhyperv.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/svm_onhyperv.h b/arch/x86/kvm/svm/svm_onhyperv.h index 57291e222395..0f262460b2e6 100644 --- a/arch/x86/kvm/svm/svm_onhyperv.h +++ b/arch/x86/kvm/svm/svm_onhyperv.h @@ -31,6 +31,11 @@ struct hv_enlightenments { u64 reserved; } __packed; +/* + * Hyper-V uses the software reserved clean bit in VMCB + */ +#define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW + static inline void svm_hv_init_vmcb(struct vmcb *vmcb) { struct hv_enlightenments *hve = @@ -52,6 +57,23 @@ static inline void svm_hv_hardware_setup(void) } } +static inline void svm_hv_vmcb_dirty_nested_enlightenments( + struct kvm_vcpu *vcpu) +{ + struct vmcb *vmcb = to_svm(vcpu)->vmcb; + struct hv_enlightenments *hve = + (struct hv_enlightenments *)vmcb->control.reserved_sw; + + /* + * vmcb can be NULL if called during early vcpu init. + * And its okay not to mark vmcb dirty during vcpu init + * as we mark it dirty unconditionally towards end of vcpu + * init phase. + */ + if (vmcb && vmcb_is_clean(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS) && + hve->hv_enlightenments_control.msr_bitmap) + vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); +} #else static inline void svm_hv_init_vmcb(struct vmcb *vmcb) @@ -61,6 +83,11 @@ static inline void svm_hv_init_vmcb(struct vmcb *vmcb) static inline void svm_hv_hardware_setup(void) { } + +static inline void svm_hv_vmcb_dirty_nested_enlightenments( + struct kvm_vcpu *vcpu) +{ +} #endif /* CONFIG_HYPERV */ #endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */ |