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Re: [PATCH v1] tools/xen-cpuid: show enqcmd

  • To: Olaf Hering <olaf@xxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Fri, 31 Jul 2020 13:24:18 +0100
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  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
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On 31/07/2020 13:15, Olaf Hering wrote:
> Am Fri, 31 Jul 2020 13:04:35 +0100
> schrieb Andrew Cooper <andrew.cooper3@xxxxxxxxxx>:
>> And in particular, probably missing from libxl_cpuid.c, which I was
>> meaning to check when I've got a free moment.
> Will a ever domU see this flag? I just spotted the <29> when comparing 
> 'xen-cpuid' output between recent Xen releases. It shows up just in the 
> 'Known' section at this point.

For future platforms supporting Compute eXpress Link, PCIPassthrough
will be able to give various accelerators to VMs, and the ENQCMD{,S}
instructions is what the guest will use to talk to hardware.

As a set of functionality, think DPDK but with with userspace (or the
guest) able to submit work to hardware directly, through an interface
designed to be safe for this kind of thing.




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