Re: [PATCH RFC] KVM: inject #UD if instruction emulation fails while vcpu is in cpl==3

[Avi Kivity <avi@redhat.com>]

On 05/06/2010 03:25 PM, Gleb Natapov wrote:
>
>> We can expect that from a developer or a user subscribed to kvm@.
>> But what about some random user running virt-manager?
>>
>>      
> What virt-manager would do about such error?
>    

Call up abrt.

>> True.  But the same problem exists with cpl>0 #UD.  It may be a
>> critical driver in userspace (say, video driver).
>>
>> Also need to think consider nested kernels (which are userspace for
>> this purpose).
>>      
> Ugh, we can check if vcpu is in nested mode.
>    

And do what?  Inject #UD to the guest?  Or force some vmexit?

>> How about default to unconditional #UD and report, and pause if
>> requested (in userspace)?  Usually emulation failures will be 100%
>> reproducible, so the user can rerun their workload.
>>
>>      
> Didn't what to involve userspace in this, but it can be done of course.
>    

Whenever we have to make a decision, we involve userspace.

-- 
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