[RFC PATCH 3/3] KVM: x86: Use KVM_BUG/KVM_BUG_ON to handle bugs that are fatal to the VM

Paolo Bonzini pbonzini at redhat.com
Tue Sep 29 05:15:19 EDT 2020

On 29/09/20 05:52, Sean Christopherson wrote:
>> I think usage should be limited to dangerous cases, basically WARN_ON
>> level.  However I agree with Vitaly that KVM_GET_* should be allowed.
> On the topic of feedback from Vitaly, while dredging through my mailbox I
> rediscovered his suggestion of kvm->kvm_internal_bug (or maybe just
> kvm->internal_bug) instead of kvm->vm_bugged[*].


>> The other question is whether to return -EIO or KVM_EXIT_INTERNAL_ERROR.
>>  The latter is more likely to be handled already by userspace.
> And probably less confusing for unsuspecting users.  E.g. -EIO is most
> likely to be interpreted as "I screwed up", whereas KVM_EXIT_INTERNAL_ERROR
> will correctly be read as "KVM screwed up".

All good points, seems like you have enough review material for the
non-RFC version.


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