Re: [PATCH] KVM: x86: Expose more Intel AVX512 feature to guest

From	Radim Krčmář <rkrcmar@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] KVM: x86: Expose more Intel AVX512 feature to guest
Date	2016-08-11 16:50 +0200
Message-ID	<s4ZsZ-54X-3@gated-at.bofh.it> (permalink)
References	<s1D5E-1T7-7@gated-at.bofh.it> <s4SKS-O0-27@gated-at.bofh.it> <s4Ydz-4ms-3@gated-at.bofh.it>
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2016-08-11 09:24-0400, Paolo Bonzini:
>> > Expose AVX512DQ, AVX512BW, AVX512VL feature to guest.
>> > Its spec can be found at:
>> > https://software.intel.com/sites/default/files/managed/b4/3a/319433-024.pdf
>> > 
>> > Signed-off-by: Luwei Kang <luwei.kang@intel.com>
>> > ---
>> >  arch/x86/kvm/cpuid.c | 3 ++-
>> >  1 file changed, 2 insertions(+), 1 deletion(-)
>> > 
>> > diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index
>> > 7597b42..a2d007c 100644
>> > --- a/arch/x86/kvm/cpuid.c
>> > +++ b/arch/x86/kvm/cpuid.c
>> > @@ -366,7 +366,8 @@ static inline int __do_cpuid_ent(struct
>> > kvm_cpuid_entry2 *entry, u32 function,
>> >  		F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) |
>> >  		F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) |
>> >  		F(ADX) | F(SMAP) | F(AVX512F) | F(AVX512PF) | F(AVX512ER) |
>> > -		F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(PCOMMIT);
>> > +		F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(PCOMMIT) |
>> > +		F(AVX512DQ) | F(AVX512BW) | F(AVX512VL);
>> > 
>> 
>> Hi Paolo,
>>     What is your opinion?
> 
> Hi, the patch was sent too late for 4.8 so I just ignored it. :)  Radim
> is handling the tree now and I guess he'll get to it in the next few
> days.  It's a trivial patch, so I don't expect any issue.

F(PCOMMIT) was removed in dfa169bbee00 ("Revert "KVM: x86: add pcommit
support""), so the patch doesn't apply.

I made minor changes (see below) and queued for 4.9, thanks.

-		F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB);
+		F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) |
+		F(AVX512BW) | F(AVX512VL);

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RE: [PATCH] KVM: x86: Expose more Intel AVX512 feature to guest "Kang, Luwei" <luwei.kang@intel.com> - 2016-08-11 09:40 +0200
  Re: [PATCH] KVM: x86: Expose more Intel AVX512 feature to guest Paolo Bonzini <pbonzini@redhat.com> - 2016-08-11 15:30 +0200
    Re: [PATCH] KVM: x86: Expose more Intel AVX512 feature to guest Radim Krčmář <rkrcmar@redhat.com> - 2016-08-11 16:50 +0200

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