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Re: [Qemu-stable] [Qemu-devel] [PATCH] i386: mark the 'INTEL_PT' CPUID b
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-stable] [Qemu-devel] [PATCH] i386: mark the 'INTEL_PT' CPUID bit as unmigratable |
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Date: |
Fri, 28 Dec 2018 14:53:22 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 |
On 25/12/18 09:23, Kang, Luwei wrote:
>> From: Qemu-devel [mailto:address@hidden On Behalf Of Paolo Bonzini
>> Sent: Friday, December 21, 2018 8:44 PM
>> To: address@hidden
>> Cc: address@hidden; address@hidden
>> Subject: [Qemu-devel] [PATCH] i386: mark the 'INTEL_PT' CPUID bit as
>> unmigratable
>>
>> Marshaling of processor tracing MSRs is not yet implemented in QEMU, mark
>> the feature as unmigratable.
>
> Hi Paolo,
> I think Intel PT has supported live migration. I don't understand what
> you mean.
>
> commit b77146e9a129bcdb60edc23639211679ae846a92
> Author: Chao Peng <address@hidden>
> Date: Mon Mar 5 00:48:36 2018 +0800
> i386: Add support to get/set/migrate Intel Processor Trace feature
Indeed. I had forgotten this patch because it was committed so long
before the kernel parts (which really should not happen, but Eduardo and
I miscommunicated on it). Can you check that it still works?
Paolo