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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)
commit5d6c7de6446e9ab3fb41d6f7d82770e50998f3de
treee261522c73654e70f39b57475c699d44855567b9tree | snapshot
parent1c2361f667f3648855ceae25f1332c18413fdb9fcommit | 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
Domain: System / Kernel;