Amit Shah wrote:
On (Mon) Mar 30 2009 [10:07:58], Avi Kivity wrote:
1. perfctr wrmsr warning when booting 64bit RHEl5.3
https://sourceforge.net/tracker/?func=detail&aid=2721640&group_id=180599&atid=893831
This is the architectural performance counting msr which was enabled in
4f76231 (KVM: x86: Ignore reads to EVNTSEL MSRs). Amit, can you check
if appropriate cpuid leaf 10 reporting will fix this?
We already report 0s for the cpuid leaf 10; we need to report 0x3f in
EBX for leaf 10 to denote events corresponding to the bits aren't
available.
I checked and it didn't help (we can't rely on guests to abide by cpuid
flags)
I see this in the code:
/*
* Check whether the Architectural PerfMon supports
* Unhalted Core Cycles Event or not.
* NOTE: Corresponding bit = 0 in ebx indicates event present.
*/
cpuid(10, &(eax.full), &ebx, &unused, &unused);
if ((eax.split.mask_length <
(ARCH_PERFMON_UNHALTED_CORE_CYCLES_INDEX+1)) ||
(ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
return 0;
So I think it can be done.
--
error compiling committee.c: too many arguments to function
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