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Re: [Xen-devel] [SVM][PATCH] Add test for SVM Disabled via BIOS

  • To: "Woller, Thomas" <thomas.woller@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Thu, 12 Oct 2006 14:38:12 +0100
  • Delivery-date: Thu, 12 Oct 2006 06:38:40 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acbr6XXhy02v56FgQHGkVa7CShdGVgCGjN0u
  • Thread-topic: [Xen-devel] [SVM][PATCH] Add test for SVM Disabled via BIOS
On 9/10/06 22:25, "Woller, Thomas" <thomas.woller@xxxxxxx> wrote:

> Newer BIOS implementations will be able to disable the SVM feature,
> although an additional test of an MSR  (VMCR 0xC0010114 bit 4) is
> necessary (set equals disabled).  Bit 4 of MSR 0xc0010114 returns 0 (SVM
> enabled) on machines with older BIOS' without the SVM disable feature
> support.

What happens if it is disabled and we ignore the MSR? Does everything just
work, or does, for example, the write to EFER.SVME fault?

 -- Keir



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