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Re: [Xen-devel] [PATCH 00/11] [v2] misc changes for kexec in pv-on-hvm guests

  • To: Olaf Hering <olaf@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir.xen@xxxxxxxxx>
  • Date: Thu, 28 Jul 2011 14:43:43 +0100
  • Cc:
  • Delivery-date: Thu, 28 Jul 2011 06:44:26 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcxNLF2I39/zcg9QGEC70gd2UqEHig==
  • Thread-topic: [Xen-devel] [PATCH 00/11] [v2] misc changes for kexec in pv-on-hvm guests

On 28/07/2011 14:23, "Olaf Hering" <olaf@xxxxxxxxx> wrote:

> A fixed kexec-tools-2.0.2 package is required:
> http://lists.infradead.org/pipermail/kexec/2011-May/005026.html
> However, as I just found out, xenfs unconditionally adds
> /proc/xen/capabilities
> even for hvm guest.
> So: how is a hvm guest supposed to be detected in 3.0?

Rip the moving parts from tools/misc/xen-detect.c. It does rely on hooking
SIGILL if you want to safely probe for being a PV guest (uses a
paravirtualised CPUID instruction that is normally an illegal instruction).

 -- Keir

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