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Re: [Xen-devel] Getting the XSAVE size from userspace

  • To: Jan Beulich <JBeulich@xxxxxxxx>
  • From: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
  • Date: Thu, 5 Nov 2015 12:47:08 +0200
  • Cc: "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>
  • Comment: DomainKeys? See http://domainkeys.sourceforge.net/
  • Delivery-date: Thu, 05 Nov 2015 10:47:08 +0000
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On 11/05/2015 12:42 PM, Jan Beulich wrote:
>>>> On 05.11.15 at 10:52, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
>> I need to get the XSAVE size from userspace. The easiest way seems to be
>> to use the XEN_DOMCTL_getvcpuextstate hypercall, but that hypercall is
>> not public / there's no xenctrl.h wrapper for it.
> Before going into any detail of the rest of your mail - any reason you
> can't just consult CPUID output?

That's because the userspace application doesn't live in dom0, but in a
dedicated privileged domain, and I'm unsure if a CPUID issued there
yields the same results as a CPUID issued in dom0. So I thought the
safest way is to get the information directly from the hypervisor. Is
this assumption incorrect?


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