lkml.org 
[lkml]   [2020]   [Oct]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v3 00/11] KVM: VMX: Clean up Hyper-V PV TLB flush
Date
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

\
 
 \ /
  Last update: 2020-10-27 22:24    [W:0.289 / U:0.724 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site