vpmu intel: Add cpuid handling when vpmu disabled

Even though vpmu is disabled in the hypervisor in the HVM guest the call of
cpuid(0xa) returns informations about usable performance counters.
This may confuse guest software when trying to use the counters and nothing
happens.
This patch clears most bits in registers eax and edx of cpuid(0xa) instruction
for the guest when vpmu is disabled:
 - version ID of architectural performance counting
 - number of general pmu registers
 - width of general pmu registers
 - number of fixed pmu registers
 - width of ixed pmu registers

Signed-off-by: Dietmar Hahn <dietmar.hahn@ts.fujitsu.com>
Acked-by: Keir Fraser <keir@xen.org>

0 files changed, 0 insertions, 0 deletions