[3.8.y.z extended stable] Patch "x86, AVX-512: AVX-512 Feature Detection" has been added to staging queue

[Kamal Mostafa]

On Fri, 2014-04-18 at 02:13 +0000, Yu, Fenghua wrote:
> Hi, Kamal,
> 
> Except the patch in your email, there is another patch:
> https://lkml.org/lkml/2014/2/20/546
> 
> Please add this patch as well if not done yet.


Hi Fenghua-

I didn't pick up that additional patch:

  c2bc11f x86, AVX-512: Enable AVX-512 States Context Switch

because its only (?) purpose seemed to be to modify the definition of
XSTATE_LAZY, which doesn't exist in 3.8-stable[0].

Would just adding the additional XSTATE_ definitions be useful for
3.8-stable for some other reason?

Thanks for reviewing this!

 -Kamal

[0] http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=blob;f=arch/x86/include/asm/xsave.h;h=0415cdabb5a663d1684284525a3fe24b7b3cd359;hb=refs/heads/linux-3.8.y-queue


> > -----Original Message-----
> > From: Kamal Mostafa [mailto:kamal at canonical.com]
> > Sent: Thursday, April 17, 2014 4:30 PM
> > To: Yu, Fenghua
> > Cc: H. Peter Anvin; Kamal Mostafa; kernel-team at lists.ubuntu.com
> > Subject: [3.8.y.z extended stable] Patch "x86, AVX-512: AVX-512 Feature
> > Detection" has been added to staging queue
> > 
> > This is a note to let you know that I have just added a patch titled
> > 
> >     x86, AVX-512: AVX-512 Feature Detection
> > 
> > to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree
> > which can be found at:
> > 
> > 
> > http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads
> > /linux-3.8.y-queue
> > 
> > This patch is scheduled to be released in version 3.8.13.22.
> > 
> > If you, or anyone else, feels it should not be added to this tree,
> > please
> > reply to this email.
> > 
> > For more information about the 3.8.y.z tree, see
> > https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
> > 
> > Thanks.
> > -Kamal
> > 
> > ------
> > 
> > From 072af6571a063dd603521b6c947cf094b7d347a1 Mon Sep 17 00:00:00 2001
> > From: Fenghua Yu <fenghua.yu at intel.com>
> > Date: Thu, 20 Feb 2014 13:24:50 -0800
> > Subject: x86, AVX-512: AVX-512 Feature Detection
> > 
> > commit 8e5780fdeef7dc490b3f0b3a62704593721fa4f3 upstream.
> > 
> > AVX-512 is an extention of AVX2. Its spec can be found at:
> > http://download-
> > software.intel.com/sites/default/files/managed/71/2e/319433-017.pdf
> > 
> > This patch detects AVX-512 features by CPUID.
> > 
> > Signed-off-by: Fenghua Yu <fenghua.yu at intel.com>
> > Link: http://lkml.kernel.org/r/1392931491-33237-1-git-send-email-
> > fenghua.yu at intel.com
> > Signed-off-by: H. Peter Anvin <hpa at linux.intel.com>
> > Signed-off-by: Kamal Mostafa <kamal at canonical.com>
> > ---
> >  arch/x86/include/asm/cpufeature.h | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/arch/x86/include/asm/cpufeature.h
> > b/arch/x86/include/asm/cpufeature.h
> > index d3f0db1..0480fb9 100644
> > --- a/arch/x86/include/asm/cpufeature.h
> > +++ b/arch/x86/include/asm/cpufeature.h
> > @@ -211,9 +211,13 @@
> >  #define X86_FEATURE_ERMS	(9*32+ 9) /* Enhanced REP MOVSB/STOSB */
> >  #define X86_FEATURE_INVPCID	(9*32+10) /* Invalidate Processor Context
> > ID */
> >  #define X86_FEATURE_RTM		(9*32+11) /* Restricted
> > Transactional Memory */
> > +#define X86_FEATURE_AVX512F	(9*32+16) /* AVX-512 Foundation */
> >  #define X86_FEATURE_RDSEED	(9*32+18) /* The RDSEED instruction */
> >  #define X86_FEATURE_ADX		(9*32+19) /* The ADCX and ADOX
> > instructions */
> >  #define X86_FEATURE_SMAP	(9*32+20) /* Supervisor Mode Access
> > Prevention */
> > +#define X86_FEATURE_AVX512PF	(9*32+26) /* AVX-512 Prefetch */
> > +#define X86_FEATURE_AVX512ER	(9*32+27) /* AVX-512 Exponential and
> > Reciprocal */
> > +#define X86_FEATURE_AVX512CD	(9*32+28) /* AVX-512 Conflict Detection
> > */
> > 
> >  #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
> > 
> > --
> > 1.9.1
>