KVM: x86: Bail to userspace if emulation of atomic user access faults

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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>

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Sean Christopherson 2022-02-02 00:49:45 +00:00 • committed by Paolo Bonzini

parent 1c2361f667

commit 5d6c7de644

1 changed files with 1 additions and 1 deletions

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arch/x86/kvm/x86.c

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