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
