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

[Sean Christopherson]

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(-)

-- 
2.28.0