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

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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

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