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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201027212346.23409-1-sean.j.christopherson@intel.com>
Date:   Tue, 27 Oct 2020 14:23:35 -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 v3 00/11] 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.

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