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SubjectRe: [PATCH v3 00/11] KVM: VMX: Clean up Hyper-V PV TLB flush
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On 27/10/20 22:23, Sean Christopherson wrote:
> Clean up KVM's PV TLB flushing when running with EPT on Hyper-V, i.e. as
> a nested VMM. No real goal in mind other than the sole patch in v1, which
> is a minor change to avoid a future mixup when TDX also wants to define
> .remote_flush_tlb. Everything else is opportunistic clean up.
>
> Patch 1 legitimately tested on VMX (no SVM), everything else effectively
> build tested only.
>
> v3:
> - Add a patch to pass the root_hpa instead of pgd to vmx_load_mmu_pgd()
> and retrieve the active PCID only when necessary. [Vitaly]
> - Selectively collects reviews (skipped a few due to changes). [Vitaly]
> - Explicitly invalidate hv_tlb_eptp instead of leaving it valid when
> the mismatch tracker "knows" it's invalid. [Vitaly]
> - Change the last patch to use "hv_root_ept" instead of "hv_tlb_pgd"
> to better reflect what is actually being tracked.
>
> v2: Rewrite everything.
>
> Sean Christopherson (11):
> KVM: x86: Get active PCID only when writing a CR3 value
> KVM: VMX: Track common EPTP for Hyper-V's paravirt TLB flush
> KVM: VMX: Stash kvm_vmx in a local variable for Hyper-V paravirt TLB
> flush
> KVM: VMX: Fold Hyper-V EPTP checking into it's only caller
> KVM: VMX: Do Hyper-V TLB flush iff vCPU's EPTP hasn't been flushed
> KVM: VMX: Invalidate hv_tlb_eptp to denote an EPTP mismatch
> KVM: VMX: Don't invalidate hv_tlb_eptp if the new EPTP matches
> KVM: VMX: Explicitly check for hv_remote_flush_tlb when loading pgd
> KVM: VMX: Define Hyper-V paravirt TLB flush fields iff Hyper-V is
> enabled
> KVM: VMX: Skip additional Hyper-V TLB EPTP flushes if one fails
> KVM: VMX: Track root HPA instead of EPTP for paravirt Hyper-V TLB
> flush
>
> arch/x86/include/asm/kvm_host.h | 4 +-
> arch/x86/kvm/mmu.h | 2 +-
> arch/x86/kvm/svm/svm.c | 4 +-
> arch/x86/kvm/vmx/vmx.c | 134 ++++++++++++++++++--------------
> arch/x86/kvm/vmx/vmx.h | 19 ++---
> 5 files changed, 87 insertions(+), 76 deletions(-)
>

Queued, thanks.

Paolo

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