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 <jbeul...@suse.com>
Acked-by: Andrew Cooper <andrew.coop...@citrix.com>
> @@ -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.
~Andrew
