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Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq


From: Benoît Canet
Subject: Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq
Date: Mon, 26 Aug 2013 18:45:27 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

> Talk to Eduardo since this is related to cpuid configuration and he is
> an expert.

I found the following in target-i386/cpu.c

    case 0x80000006:
        /* cache info (L2 cache) */
        *eax = 0;
        *ebx = 0x42004200;
        *ecx = 0x02008140;
        *edx = 0;
        break;

>From the AMD cpuid book it look like the L3 settings are not defined (edx).

Eduardo: A user I know want to be able to set the size of the guest L3 cache.
I am ok to write a patch to do so.

Do you have some recommandations regarding the other fields of the edx register 
?
What would be an acceptable user interface to set this ?

Best regards

Benoît



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