linux-kernel - [PATCH 0/4] KVM: VMX: Fix handling of invalid L2 guest state

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Date:   Tue,  7 Dec 2021 19:30:02 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.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,
        syzbot+f1d2136db9c80d4733e8@...kaller.appspotmail.com,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 0/4] KVM: VMX: Fix handling of invalid L2 guest state

Fixes and a test for invalid L2 guest state.  TL;DR: KVM should never
emulate L2 if L2's guest state is invalid.

Patch 01 fixes a regression found by syzbot. Patch 02 closes what I suspect
was the hole the buggy patch was trying to close.  Patch 03 is a related
docs update.  Patch 04 is a selftest for the regression and for a subset
of patch 02's behavior.

Sean Christopherson (4):
  KVM: VMX: Always clear vmx->fail on emulation_required
  KVM: nVMX: Synthesize TRIPLE_FAULT for L2 if emulation is required
  KVM: VMX: Fix stale docs for kvm-intel.emulate_invalid_guest_state
  KVM: selftests: Add test to verify TRIPLE_FAULT on invalid L2 guest
    state

 .../admin-guide/kernel-parameters.txt         |   8 +-
 arch/x86/kvm/vmx/vmx.c                        |  36 ++++--
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../x86_64/vmx_invalid_nested_guest_state.c   | 105 ++++++++++++++++++
 5 files changed, 138 insertions(+), 13 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86_64/vmx_invalid_nested_guest_state.c

-- 
2.34.1.400.ga245620fadb-goog