From: Razvan Cojocaru <rcojocaru@bitdefender.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: Getting the XSAVE size from userspace
Date: Thu, 5 Nov 2015 12:47:08 +0200 [thread overview]
Message-ID: <563B33AC.8000106@bitdefender.com> (raw)
In-Reply-To: <563B40A202000078000B211F@prv-mh.provo.novell.com>
On 11/05/2015 12:42 PM, Jan Beulich wrote:
>>>> On 05.11.15 at 10:52, <rcojocaru@bitdefender.com> 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?
Thanks,
Razvan
next prev parent reply other threads:[~2015-11-05 10:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-05 9:52 Getting the XSAVE size from userspace Razvan Cojocaru
2015-11-05 10:42 ` Jan Beulich
2015-11-05 10:47 ` Razvan Cojocaru [this message]
2015-11-05 10:52 ` Jan Beulich
2015-11-05 10:53 ` Andrew Cooper
2015-11-05 10:49 ` Andrew Cooper
2015-11-05 10:51 ` Jan Beulich
2015-11-05 11:35 ` Andrei LUTAS
2015-11-05 11:44 ` Andrew Cooper
2015-11-05 12:26 ` Razvan Cojocaru
2015-11-05 14:05 ` Andrew Cooper
2015-11-05 14:13 ` Razvan Cojocaru
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