On 07.05.2020 21:32, Andrew Cooper wrote:
> On 05/05/2020 09:14, Jan Beulich wrote:
>> ... enabling its use by all guest kinds at the same time.
>>
>> Signed-off-by: Jan Beulich <[email protected]>
>
> Acked-by: Andrew Cooper <[email protected]>
Thanks.
>> @@ -5660,6 +5661,18 @@ x86_emulate(
>> goto done;
>> break;
>>
>> + case 0xe8:
>> + switch ( vex.pfx )
>> + {
>> + case vex_none: /* serialize */
>> + host_and_vcpu_must_have(serialize);
>> + asm volatile ( ".byte 0x0f, 0x01, 0xe8" );
>
> There is very little need for an actual implementation here. The VMExit
> to get here is good enough.
>
> The only question is whether pre-unrestricted_guest Intel boxes are
> liable to find this in real mode code.
Apart from this we also shouldn't assume HVM in the core emulator,
I think.
Jan
