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Re: [Xen-devel] vlapic warning messages

  • To: Ky Srinivasan <ksrinivasan@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <keir@xxxxxxxxxxxxx>
  • Date: Wed, 14 Mar 2007 11:24:08 +0000
  • Delivery-date: Wed, 14 Mar 2007 04:23:30 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdmK0fxhquzJtIeEdulEwAX8io7RQ==
  • Thread-topic: [Xen-devel] vlapic warning messages

On 13/3/07 21:56, "Ky Srinivasan" <ksrinivasan@xxxxxxxxxx> wrote:

> While running unmodified  guests  I sometime  get the following warning
> message from vlapic:
> vlapic.c:217:d0 Bad DFR value for lapic of vcpu 0
> Any ideas on what the problem might be.

Can you extend that line of tracing to print the bad value
(vlapic_get_reg(vlapic, APIC_DFR))?

I'd say it's most likely that the guest is writing zeroes into reserved-1
bits of the DFR, and we should be ignoring the modification of those bits.

 -- Keir

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