| Message ID | acba3aac-bcf3-ce8f-1b0f-bd5017007553@suse.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | XSA-292 follow-up | expand |
On Wed, Sep 11, 2019 at 05:26:12PM +0200, Jan Beulich wrote: > PCID validly depends on LM, as it can be enabled in Long Mode only. > INVPCID, otoh, can be used not only without PCID enabled, but also > outside of Long Mode altogether. In both cases its functionality is > simply restricted to PCID 0, which is sort of expected as no other PCID > can be activated there. > > Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Thanks, Roger.
--- a/xen/tools/gen-cpuid.py +++ b/xen/tools/gen-cpuid.py @@ -218,10 +218,6 @@ def crunch_numbers(state): # # SSE4_2: [POPCNT] - # The INVPCID instruction depends on PCID infrastructure being - # available. - PCID: [INVPCID], - # XSAVE is an extra set of instructions for state management, but # doesn't constitue new state itself. Some of the dependent features # are instructions built on top of base XSAVE, while others are new
PCID validly depends on LM, as it can be enabled in Long Mode only. INVPCID, otoh, can be used not only without PCID enabled, but also outside of Long Mode altogether. In both cases its functionality is simply restricted to PCID 0, which is sort of expected as no other PCID can be activated there. Signed-off-by: Jan Beulich <jbeulich@suse.com>