Re: memtest 4.20+ does not work with -cpu host

[Peter Lieven <pl@dlhnet.de>]

On 09/10/12 13:29, Paolo Bonzini wrote:
> Il 10/09/2012 13:06, Peter Lieven ha scritto:
>> qemu-kvm-1.0.1-5107 [007] 410771.148000: kvm_entry: vcpu 0
>> qemu-kvm-1.0.1-5107 [007] 410771.148000: kvm_exit: reason MSR_READ rip
>> 0x11478 info 0 0
>> qemu-kvm-1.0.1-5107 [007] 410771.148000: kvm_msr: msr_read 194 = 0x0 (#GP)
>> qemu-kvm-1.0.1-5107 [007] 410771.148000: kvm_inj_exception: #GP (0x0)
>> qemu-kvm-1.0.1-5107 [007] 410771.148000: kvm_entry: vcpu 0
>> qemu-kvm-1.0.1-5107 [007] 410771.148000: kvm_exit: reason TRIPLE_FAULT
>> rip 0x11478 info 0 0
> Memory controller MSR:
>
> static float getNHMmultiplier(void)
> {
>          unsigned int msr_lo, msr_hi;
>          float coef;
>
>          /* Find multiplier (by MSR) */
>          /* First, check if Flexible Ratio is Enabled */
>          rdmsr(0x194, msr_lo, msr_hi);
>          if((msr_lo>>  16)&  1){
>                  coef = (msr_lo>>  8)&  0xFF;
>           } else {
>                  rdmsr(0xCE, msr_lo, msr_hi);
>                  coef = (msr_lo>>  8)&  0xFF;
>           }
>
>          return coef;
> }
>
> Looks like we need to emulate it since memtest only looks at the cpuid
> to detect an integrated memory controller.  What does this return for you?
>
> dd if=/dev/cpu/0/msr skip=$((0x194)) bs=8 count=1 | xxd
> dd if=/dev/cpu/0/msr skip=$((0xCE)) bs=8 count=1 | xxd
I/O error.

Peter