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Re: [Qemu-devel] [QEMU PATCH] target-i386: Disable rdtscp on Opteron_G*
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [QEMU PATCH] target-i386: Disable rdtscp on Opteron_G* CPU models |
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Date: |
Mon, 16 Nov 2015 10:44:59 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 13/11/2015 20:07, Eduardo Habkost wrote:
> KVM can't virtualize rdtscp on AMD CPUs yet, so there's no point
> in enabling it by default on AMD CPU models, as all we are
> getting are confused users because of the "host doesn't support
> requested feature" warnings.
>
> Disable rdtscp on Opteron_G* models, but keep compatibility on
> pc-*-2.4 and older (just in case there are people are doing funny
> stuff using AMD CPU models on Intel hosts).
>
> Signed-off-by: Eduardo Habkost <address@hidden>
Can we do it only on KVM and not on TCG?
Paolo