Re: [PATCH v3 00/11] KVM: VMX: Clean up Hyper-V PV TLB flush

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