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Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature defin
From: |
Liu, Jinsong |
Subject: |
Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition |
Date: |
Fri, 6 Dec 2013 22:12:30 +0000 |
H. Peter Anvin wrote:
> On 12/06/2013 12:05 PM, Liu, Jinsong wrote:
>>>
>>> Since Peter already said the same, please undo these changes.
>>>
>>> Also, how is XSTATE_EAGER used? Should MPX be disabled when
>>> xsaveopt is disabled on the kernel command line? (Liu, how would
>>> this affect the KVM patches, too?)
>>>
>>> Paolo
>>
>> Currently seems no, and if needed we can add a new patch at kvm side
>> accordingly when native mpx patches checked in.
>>
>
> We need to either disable these features in lazy mode, or we need to
> force eager mode if these features are to be supported. The problem
> with the latter is that it means forcing eager mode regardless of if
> anything actually *uses* these features.
>
> A third option would be to require applications to use a prctl() or
> similar to enable eager-save features.
>
> Thoughts?
>
> -hpa
The third option seems better -- how does native mpx patches work, force eager?
Thanks,
Jinsong
- [Qemu-devel] [PATCH v2 1/3] x86, mpx: add documentation on Intel MPX, Qiaowei Ren, 2013/12/06
- [Qemu-devel] [PATCH v2 2/3] X86, mpx: Intel MPX CPU feature definition, Qiaowei Ren, 2013/12/06
- [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, Qiaowei Ren, 2013/12/06
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, Paolo Bonzini, 2013/12/06
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, H. Peter Anvin, 2013/12/06
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, Liu, Jinsong, 2013/12/06
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, H. Peter Anvin, 2013/12/06
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition,
Liu, Jinsong <=
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, Ren, Qiaowei, 2013/12/06
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, H. Peter Anvin, 2013/12/06
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, Ren, Qiaowei, 2013/12/06
- Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition, H. Peter Anvin, 2013/12/06