KVM: nVMX: Fail on MMIO completion for nested posted interrupts

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When the kernel has no mapping for the vmcs02 virtual APIC page,
userspace MMIO completion is necessary to process nested posted
interrupts. This is not a configuration that KVM supports. Rather than
silently ignoring the problem, try to exit to userspace with
KVM_INTERNAL_ERROR.

Note that the event that triggers this error is consumed as a
side-effect of a call to kvm_check_nested_events. On some paths
(notably through kvm_vcpu_check_block), the error is dropped. In any
case, this is an incremental improvement over always ignoring the
error.

Signed-off-by: Jim Mattson <jmattson@google.com>
Message-Id: <20210604172611.281819-7-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Jim Mattson 2021-06-04 10:26:05 -07:00 • committed by Paolo Bonzini

parent 4fe09bcf14

commit 0fe998b295

1 changed files with 5 additions and 1 deletions

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arch/x86/kvm/vmx/nested.c

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