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Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature defin
From: |
H. Peter Anvin |
Subject: |
Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition |
Date: |
Fri, 06 Dec 2013 13:33:50 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 |
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
- [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 <=
- 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, 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