On Wed, Sep 21, 2022 at 03:51:42PM +0100, Dr. David Alan Gilbert wrote: > * Wang, Lei (lei4.w...@intel.com) wrote: > > The new CPU model mostly inherits features from Icelake-Server, while > > adding new features: > > - AMX (Advance Matrix eXtensions) > > - Bus Lock Debug Exception > > and new instructions: > > - AVX VNNI (Vector Neural Network Instruction): > > - VPDPBUS: Multiply and Add Unsigned and Signed Bytes > > - VPDPBUSDS: Multiply and Add Unsigned and Signed Bytes with Saturation > > - VPDPWSSD: Multiply and Add Signed Word Integers > > - VPDPWSSDS: Multiply and Add Signed Integers with Saturation > > - FP16: Replicates existing AVX512 computational SP (FP32) instructions > > using FP16 instead of FP32 for ~2X performance gain > > - SERIALIZE: Provide software with a simple way to force the processor to > > complete all modifications, faster, allowed in all privilege levels and > > not causing an unconditional VM exit > > - TSX Suspend Load Address Tracking: Allows programmers to choose which > > memory accesses do not need to be tracked in the TSX read set > > - AVX512_BF16: Vector Neural Network Instructions supporting BFLOAT16 > > inputs and conversion instructions from IEEE single precision > > > > Features may be added in future versions: > > - CET (virtualization support hasn't been merged) > > Instructions may be added in future versions: > > - fast zero-length MOVSB (KVM doesn't support yet) > > - fast short STOSB (KVM doesn't support yet) > > - fast short CMPSB, SCASB (KVM doesn't support yet) > > > > Signed-off-by: Wang, Lei <lei4.w...@intel.com> > > Reviewed-by: Robert Hoo <robert...@linux.intel.com> > > Hi, > What fills in the AMX tile and tmul information leafs > (0x1D, 0x1E)? > In particular, how would we make sure when we migrate between two > generations of AMX/Tile/Tmul capable devices with different > register/palette/tmul limits that the migration is tied to the CPU type > correctly? > Would you expect all devices called a 'SappireRapids' to have the same > sizes?
We shouldn't assume this will only be used on 'SappireRapids' host silicon. Thi named CPU model is likely to be used by a guest running on any host silicon generations that follow SappireRapids too. With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|