linux-kernel - [PATCH v2 00/10] KVM: VMX: Clean up Hyper-V PV TLB flush

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Message-Id: <20201020215613.8972-1-sean.j.christopherson@intel.com>
Date:   Tue, 20 Oct 2020 14:56:03 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 00/10] KVM: VMX: Clean up Hyper-V PV TLB flush

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.

Ran Hyper-V KVM unit tests (if those are even relevant?), but haven't
actually tested on top of Hyper-V.

v2: Rewrite everything.

Sean Christopherson (10):
  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 PGD instead of EPTP for paravirt Hyper-V TLB flush

 arch/x86/kvm/vmx/vmx.c | 102 ++++++++++++++++++++---------------------
 arch/x86/kvm/vmx/vmx.h |  16 +++----
 2 files changed, 57 insertions(+), 61 deletions(-)

-- 
2.28.0