On 22.07.25 14:21, Xiaoyao Li wrote:
> On 7/22/2025 7:15 PM, Daniel P. Berrangé wrote:
>> [...]
>>
>> Usually CSPs don't have full control over what their customers
>> are running as a guest. If their customers are running mainstream
>> modern guest OS, CONFIG_STRICT_KERNEL_RWX is pretty likely to be
>> set, so presumably migration between Intel & AMD will not work
>> and this isn't making it worse ?
> 
> If breaking some usecase is not a concern, then I'm fine with no compat
> property.

Well, there's still the chicken bit `-accel kvm,hypercall-patching=on`
one could make use of if (and really only if) that's really needed. But
I'd rather have the guest see a proper exception emulation of trying to
execute an unsupported instruction than seeing a bogus #PF.

Thanks,
Mathias

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