Re: [RFT] Fix for unhandled msr c0000081 problems under Intel cpus

* Avi Kivity <avi@xxxxxxxxxxxx> wrote:

> >that did the trick. The only messages remaining are:
> >
> > kvm: unhandled wrmsr: 0xc1
> > inject_general_protection: rip 0xc011b8ae
> >
> >  
> 
> That's a performance counter.  What guest triggers it?

a 32-bit Linux bzImage:

  c011b8ae:       0f 30                   wrmsr

 (gdb) list *0xc011b8ae
 0xc011b8ae is in setup_apic_nmi_watchdog (include/asm/msr.h:36).
 31      static inline void wrmsrl (unsigned long msr, unsigned long long val)
 32      {
 33              unsigned long lo, hi;
 34              lo = (unsigned long) val;
 35              hi = val >> 32;
 36              wrmsr (msr, lo, hi);
 37      }
 38
 39      /* wrmsr with exception handling */
 40      #define wrmsr_safe(msr,a,b) ({ int ret__;                              

the guest also obviously crashes due to this #GPF.

[ 2.6.20-rc2-rt2 kernel of course ;-) ]

        Ingo

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