Re: [PATCH 2/6] KVM: VMX: cleanup check for invalid EPT violation
From: David Hildenbrand
Date: Thu Mar 09 2017 - 05:51:15 EST
Am 09.03.2017 um 11:43 schrieb David Hildenbrand:
> Am 08.03.2017 um 19:03 schrieb Paolo Bonzini:
>> handle_ept_violation is checking for "guest-linear-address invalid" +
>> "paging-structure walk", which is a sign of a bug in KVM. However,
>> _all_ EPT violations without a valid guest linear address are paging
>> structure walks, because those EPT violations happen when loading the
>> guest PDPTEs. So simplify the check to only look at bit 7 of the
>> exit qualification.
> Do we have any define for this magic bit 7?
> #EPT_EXITQ_GLA_VALID 0x80
would make sense.