On 05/09/2017 06:27 AM, Daniel P. Berrange wrote:
This enables report of a signature in CPUID for the TCG
interpretor.
Changed in v4:
- Report 0x40000001 in EAX for 0x40000000 index (Eduardo)
- Report all zeros for 0x40000001 index (Eduardo)
- Make code style consistent when checking limits (Eduardo)
Changed in v3:
- Simplify CPU limit code still further (Eduardo)
Changed in v2:
- Rewrite the way we bounds check / cap the CPUID index
to use a flat switch, instead of nested ifs (Eduardo)
- Add a 'tcg-cpuid' property to allow it to be hidden
(Eduardo)
- Hide the TCG signature for old machine types
- Force code to a no-op if tcg_enabled() is false (Eduardo)
NB, I did not introduce a general 'hypervisor-cpuid' property
to obsolete the existing 'kvm=off|on' -cpu property, since it
appears impossible to get the back compat semantics right,
as described in a previous reply.
Daniel P. Berrange (2):
i386: rewrite way CPUID index is validated
i386: expose "TCGTCGTCGTCG" in the 0x40000000 CPUID leaf
I probably should have commented earlier but... what's the point?
If you want the guest os to actually do anything with this, what do you gain
for advertising TCG over KVM?
r~
