Re: [PATCH v2 6/6] target/i386: Add new CPU model GraniteRapids

[Tao Su <tao1.su@linux.intel.com>]

On Wed, Jan 31, 2024 at 01:34:31PM +0100, Igor Mammedov wrote:
> On Tue, 30 Jan 2024 21:34:36 +0800
> Tao Su <tao1.su@linux.intel.com> wrote:
> 
> > On Tue, Jan 30, 2024 at 11:14:59AM +0100, Igor Mammedov wrote:
> > > On Thu,  6 Jul 2023 13:49:49 +0800
> > > Tao Su <tao1.su@linux.intel.com> wrote:
> > >   
> > > > The GraniteRapids CPU model mainly adds the following new features
> > > > based on SapphireRapids:
> > > > - PREFETCHITI CPUID.(EAX=7,ECX=1):EDX[bit 14]
> > > > - AMX-FP16 CPUID.(EAX=7,ECX=1):EAX[bit 21]  
> > > 
> > > it seems the list/definition is not complete, see
> > > https://lore.kernel.org/kvm/20221125125845.1182922-1-jiaxi.chen@linux.intel.com/
> > > and those feature bits were merged into QEMU earlier (a9ce107fd0f..d1a11115143)
> > > 
> > > were they omited intentionaly?
> > >   
> > 
> > No, Jiaxi’s patch series includes new feature bits of both Granite Rapids(GNR)
> > and Sierra Forest(SRF).
> > 
> > GNR contains:
> > 	PREFETCHITI CPUID.(EAX=7,ECX=1):EDX[bit 14]
> > 	AMX-FP16 CPUID.(EAX=7,ECX=1):EAX[bit 21]
> > 
> > SRF contains:
> > 	CMPccXADD CPUID.(EAX=7,ECX=1):EAX[bit 7]
> > 	AVX-IFMA CPUID.(EAX=7,ECX=1):EAX[bit 23]
> > 	AVX-VNNI-INT8 CPUID.(EAX=7,ECX=1):EDX[bit 4]
> > 	AVX-NE-CONVERT CPUID.(EAX=7,ECX=1):EDX[bit 5]
> 
> > What new platforms support the new features can be found in Table 1-2 of ISE[1].
> > And the SRF CPU model we submitted[2] contains the four feature bits supported above.
> Thanks,
> 
> for future patches: 
> this kind of info should be part of commit message incl.
> spec/doc title/revision it's coming from with a specific
> chapter/table also mentioned. This way whoever reads it
> later won't have to ask or spend time for searching where
> it comes from.
> 
> And maybe also have a comment close to new code,
> aka like we do for ACPI patches.

Got it, thanks for the suggestion! This is really useful, I will do.

Thanks,
Tao

>  
> > [1] https://cdrdv2.intel.com/v1/dl/getContent/671368
> > [2] https://lore.kernel.org/all/20231206131923.1192066-1-tao1.su@linux.intel.com/
> > 
> > Thanks,
> > Tao
> > 
>