From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: memtest 4.20+ does not work with -cpu host
Date: Mon, 10 Sep 2012 13:29:30 +0200
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	<504DC9BC.1060407@dlhnet.de>
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Cc: Avi Kivity <avi@redhat.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
To: Peter Lieven <pl@dlhnet.de>
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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