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13 June 2022, 11:31:42 UTC
Revision b502e6ecdc3b6d381bd72c5f879bc1e00d6fe7db authored by Paolo Bonzini on 29 September 2020, 12:31:32 UTC, committed by Paolo Bonzini on 03 October 2020, 09:07:40 UTC 
KVM: VMX: update PFEC_MASK/PFEC_MATCH together with PF intercept
 
The PFEC_MASK and PFEC_MATCH fields in the VMCS reverse the meaning of
the #PF intercept bit in the exception bitmap when they do not match.
This means that, if PFEC_MASK and/or PFEC_MATCH are set, the
hypervisor can get a vmexit for #PF exceptions even when the
corresponding bit is clear in the exception bitmap.

This is unexpected and is promptly detected by a WARN_ON_ONCE.
To fix it, reset PFEC_MASK and PFEC_MATCH when the #PF intercept
is disabled (as is common with enable_ept && !allow_smaller_maxphyaddr).

Reported-by: Qian Cai <cai@redhat.com>>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 parent 4bb05f3
History
Tip revision: b502e6ecdc3b6d381bd72c5f879bc1e00d6fe7db authored by Paolo Bonzini on 29 September 2020, 12:31:32 UTC
KVM: VMX: update PFEC_MASK/PFEC_MATCH together with PF intercept
Tip revision: b502e6e
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