diff options
| author | Vineeth Pillai <viremana@linux.microsoft.com> | 2021-06-03 15:14:40 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-06-17 13:09:38 -0400 |
| commit | 1183646a67d01ef9c46ac87da1c57dea5f7bb153 (patch) | |
| tree | 37241d8656eb3d9ea00d327acbfb111659f0d4fb /arch/x86/kvm/svm/svm_onhyperv.h | |
| parent | c4327f15dfc7294b2abde0ea49b3e43eec3cca38 (diff) | |
| download | lwn-1183646a67d01ef9c46ac87da1c57dea5f7bb153.tar.gz lwn-1183646a67d01ef9c46ac87da1c57dea5f7bb153.zip | |
KVM: SVM: hyper-v: Direct Virtual Flush support
From Hyper-V TLFS:
"The hypervisor exposes hypercalls (HvFlushVirtualAddressSpace,
HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressList, and
HvFlushVirtualAddressListEx) that allow operating systems to more
efficiently manage the virtual TLB. The L1 hypervisor can choose to
allow its guest to use those hypercalls and delegate the responsibility
to handle them to the L0 hypervisor. This requires the use of a
partition assist page."
Add the Direct Virtual Flush support for SVM.
Related VMX changes:
commit 6f6a657c9998 ("KVM/Hyper-V/VMX: Add direct tlb flush support")
Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
Message-Id: <fc8d24d8eb7017266bb961e39a171b0caf298d7f.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 | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/svm_onhyperv.h b/arch/x86/kvm/svm/svm_onhyperv.h index 0f262460b2e6..9b9a55abc29f 100644 --- a/arch/x86/kvm/svm/svm_onhyperv.h +++ b/arch/x86/kvm/svm/svm_onhyperv.h @@ -36,6 +36,8 @@ struct hv_enlightenments { */ #define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW +int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu); + static inline void svm_hv_init_vmcb(struct vmcb *vmcb) { struct hv_enlightenments *hve = @@ -55,6 +57,23 @@ static inline void svm_hv_hardware_setup(void) svm_x86_ops.tlb_remote_flush_with_range = hv_remote_flush_tlb_with_range; } + + if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) { + int cpu; + + pr_info("kvm: Hyper-V Direct TLB Flush enabled\n"); + for_each_online_cpu(cpu) { + struct hv_vp_assist_page *vp_ap = + hv_get_vp_assist_page(cpu); + + if (!vp_ap) + continue; + + vp_ap->nested_control.features.directhypercall = 1; + } + svm_x86_ops.enable_direct_tlbflush = + svm_hv_enable_direct_tlbflush; + } } static inline void svm_hv_vmcb_dirty_nested_enlightenments( @@ -74,6 +93,19 @@ static inline void svm_hv_vmcb_dirty_nested_enlightenments( hve->hv_enlightenments_control.msr_bitmap) vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); } + +static inline void svm_hv_update_vp_id(struct vmcb *vmcb, + struct kvm_vcpu *vcpu) +{ + struct hv_enlightenments *hve = + (struct hv_enlightenments *)vmcb->control.reserved_sw; + u32 vp_index = kvm_hv_get_vpindex(vcpu); + + if (hve->hv_vp_id != vp_index) { + hve->hv_vp_id = vp_index; + vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); + } +} #else static inline void svm_hv_init_vmcb(struct vmcb *vmcb) @@ -88,6 +120,11 @@ static inline void svm_hv_vmcb_dirty_nested_enlightenments( struct kvm_vcpu *vcpu) { } + +static inline void svm_hv_update_vp_id(struct vmcb *vmcb, + struct kvm_vcpu *vcpu) +{ +} #endif /* CONFIG_HYPERV */ #endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */ |