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(parent: 88de71c) | patch
KVM: x86: Bail to userspace if emulation of atomic user access faults
authorSean Christopherson <seanjc@google.com>
Wed, 2 Feb 2022 00:49:45 +0000 (00:49 +0000)
committerPaolo Bonzini <pbonzini@redhat.com>
Wed, 13 Apr 2022 17:37:48 +0000 (13:37 -0400)
commit436e44742164ae236e7469ae3a1fb46c884c3b20
treee261522c73654e70f39b57475c699d44855567b9tree | snapshot
parent88de71c2a24754be213b526482be3fb831d600c9commit | diff
KVM: x86: Bail to userspace if emulation of atomic user access faults

Exit to userspace when emulating an atomic guest access if the CMPXCHG on
the userspace address faults.  Emulating the access as a write and thus
likely treating it as emulated MMIO is wrong, as KVM has already
confirmed there is a valid, writable memslot.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220202004945.2540433-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/x86.c diff | blob | history
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