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KVM: x86: Introduce helper to handle Hyper-V paravirt TLB flush requests

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As a preparation to making Hyper-V emulation optional, introduce a helper
to handle pending KVM_REQ_HV_TLB_FLUSH requests.

No functional change intended.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Tested-by: Jeremi Piotrowski <jpiotrowski@linux.microsoft.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20231205103630.1391318-8-vkuznets@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Vitaly Kuznetsov 2023-12-05 11:36:21 +01:00 committed by Sean Christopherson
parent e7ad84db4d
commit af9d544a45
3 changed files with 17 additions and 16 deletions
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13
arch/x86/kvm/hyperv.h
View File

@ -247,6 +247,19 @@ static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu)
return kvm_hv_get_assist_page(vcpu);
}
static inline void kvm_hv_nested_transtion_tlb_flush(struct kvm_vcpu *vcpu,
bool tdp_enabled)
{
/*
* KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or
* L2's VP_ID upon request from the guest. Make sure we check for
* pending entries in the right FIFO upon L1/L2 transition as these
* requests are put by other vCPUs asynchronously.
*/
if (to_hv_vcpu(vcpu) && tdp_enabled)
kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);
}
int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);
#endif

10
arch/x86/kvm/svm/nested.c
View File

@ -487,14 +487,8 @@ static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm,
static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)
{
/*
* KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or
* L2's VP_ID upon request from the guest. Make sure we check for
* pending entries in the right FIFO upon L1/L2 transition as these
* requests are put by other vCPUs asynchronously.
*/
if (to_hv_vcpu(vcpu) && npt_enabled)
kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);
/* Handle pending Hyper-V TLB flush requests */
kvm_hv_nested_transtion_tlb_flush(vcpu, npt_enabled);
/*
* TODO: optimize unconditional TLB flush/MMU sync. A partial list of

10
arch/x86/kvm/vmx/nested.c
View File

@ -1139,14 +1139,8 @@ static void nested_vmx_transition_tlb_flush(struct kvm_vcpu *vcpu,
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
/*
* KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or
* L2's VP_ID upon request from the guest. Make sure we check for
* pending entries in the right FIFO upon L1/L2 transition as these
* requests are put by other vCPUs asynchronously.
*/
if (to_hv_vcpu(vcpu) && enable_ept)
kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);
/* Handle pending Hyper-V TLB flush requests */
kvm_hv_nested_transtion_tlb_flush(vcpu, enable_ept);
/*
* If vmcs12 doesn't use VPID, L1 expects linear and combined mappings