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From: | Anthony Liguori |
Subject: | Re: [Qemu-devel] cpuid problem in upstream qemu with kvm |
Date: | Mon, 14 Dec 2009 14:02:03 -0600 |
User-agent: | Thunderbird 2.0.0.23 (X11/20090825) |
Gleb Natapov wrote:
I thought KVM emulates the syscall instruction? I swear I've seen patches for that.It is. Starting from 2.6.32.
Okay, so this is a performance vs. migration compatibility issue then?BTW, couldn't we just not advertise syscall in cpuid? That should fix it too without sacrificing migration compatibility. We get a slight slowdown on AMD hosts but that's probably minor compared to the cost of using emulated syscall on Intel hosts.
Regards, Anthony Liguori
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