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From: | Avi Kivity |
Subject: | Re: [Qemu-devel] [PATCH 2/3] push CPUID level to 4 to allow Intel multicore decoding |
Date: | Thu, 20 Aug 2009 13:06:47 +0300 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Lightning/1.0pre Thunderbird/3.0b3 |
On 08/19/2009 04:42 PM, Andre Przywara wrote:
Intel CPUs store the number of cores in CPUID leaf 4. So push the maxleaf value to 4 to allow the guests access to this leaf.
There's a slight compatibility risk here. If a guest has broken handling for cpuid level 4, then upgrading qemu would cause it to behave differently.
I don't think that's an issue for this patch, just highlighting the need for a systematic treatment of backward compatibility.
-- error compiling committee.c: too many arguments to function
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