mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1183646a67
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 6f6a657c99 ("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>
130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* KVM L1 hypervisor optimizations on Hyper-V for SVM.
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*/
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#ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__
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#define __ARCH_X86_KVM_SVM_ONHYPERV_H__
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#if IS_ENABLED(CONFIG_HYPERV)
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#include <asm/mshyperv.h>
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#include "hyperv.h"
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#include "kvm_onhyperv.h"
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static struct kvm_x86_ops svm_x86_ops;
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/*
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* Hyper-V uses the software reserved 32 bytes in VMCB
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* control area to expose SVM enlightenments to guests.
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*/
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struct hv_enlightenments {
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struct __packed hv_enlightenments_control {
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u32 nested_flush_hypercall:1;
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u32 msr_bitmap:1;
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u32 enlightened_npt_tlb: 1;
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u32 reserved:29;
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} __packed hv_enlightenments_control;
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u32 hv_vp_id;
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u64 hv_vm_id;
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u64 partition_assist_page;
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u64 reserved;
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} __packed;
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/*
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* Hyper-V uses the software reserved clean bit in VMCB
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*/
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#define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW
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int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu);
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static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
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{
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struct hv_enlightenments *hve =
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(struct hv_enlightenments *)vmcb->control.reserved_sw;
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if (npt_enabled &&
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ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
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hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
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}
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static inline void svm_hv_hardware_setup(void)
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{
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if (npt_enabled &&
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ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
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pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n");
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svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
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svm_x86_ops.tlb_remote_flush_with_range =
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hv_remote_flush_tlb_with_range;
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}
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if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
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int cpu;
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pr_info("kvm: Hyper-V Direct TLB Flush enabled\n");
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for_each_online_cpu(cpu) {
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struct hv_vp_assist_page *vp_ap =
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hv_get_vp_assist_page(cpu);
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if (!vp_ap)
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continue;
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vp_ap->nested_control.features.directhypercall = 1;
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}
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svm_x86_ops.enable_direct_tlbflush =
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svm_hv_enable_direct_tlbflush;
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}
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}
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static inline void svm_hv_vmcb_dirty_nested_enlightenments(
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struct kvm_vcpu *vcpu)
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{
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struct vmcb *vmcb = to_svm(vcpu)->vmcb;
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struct hv_enlightenments *hve =
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(struct hv_enlightenments *)vmcb->control.reserved_sw;
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/*
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* vmcb can be NULL if called during early vcpu init.
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* And its okay not to mark vmcb dirty during vcpu init
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* as we mark it dirty unconditionally towards end of vcpu
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* init phase.
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*/
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if (vmcb && vmcb_is_clean(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS) &&
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hve->hv_enlightenments_control.msr_bitmap)
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vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
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}
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static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
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struct kvm_vcpu *vcpu)
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{
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struct hv_enlightenments *hve =
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(struct hv_enlightenments *)vmcb->control.reserved_sw;
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u32 vp_index = kvm_hv_get_vpindex(vcpu);
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if (hve->hv_vp_id != vp_index) {
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hve->hv_vp_id = vp_index;
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vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
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}
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}
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#else
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static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
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{
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}
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static inline void svm_hv_hardware_setup(void)
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{
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}
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static inline void svm_hv_vmcb_dirty_nested_enlightenments(
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struct kvm_vcpu *vcpu)
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{
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}
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static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
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struct kvm_vcpu *vcpu)
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{
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}
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#endif /* CONFIG_HYPERV */
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#endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */
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