From: Rafal Wojtczuk <rafal@invisiblethingslab.com>
To: Keir Fraser <keir@xen.org>
Cc: xen-devel@lists.xensource.com
Subject: Re: Bug: Xen panics with #UD in acpi_processor_idle()
Date: Mon, 22 Nov 2010 16:43:35 +0100 [thread overview]
Message-ID: <20101122154334.GA11538@email> (raw)
In-Reply-To: <C9103978.AC86%keir@xen.org>
On Mon, Nov 22, 2010 at 03:15:03PM +0000, Keir Fraser wrote:
> On 22/11/2010 13:02, "Rafal Wojtczuk" <rafal@invisiblethingslab.com> wrote:
>
> > Hello,
> >
> > There seems to be an issue with handling of
> > MSR_IA32_MISC_ENABLE_MONITOR_ENABLE bit in MSR_IA32_MISC_ENABLE. The effect
> > is that Xen panics because of #UD after trying to execute "monitor"
> > instruction. Most likely Xen does not bother to set this bit, leaving
> > it to BIOS. If I understand correctly, it is mere reliability issue, not
> > triggerable from any domain.
>
> The issue appears to be be that we do not check for MWAIT support in CPUID,
> same as native Linux would do (the flag in MISC_ENABLE MSR also affects
> CPUID appropriately). Can you please try the attached patch? If it works I
> will apply it to all our trees.
Yes, with this patch the test machine boots fine.
Regards,
Rafal Wojtczuk
prev parent reply other threads:[~2010-11-22 15:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-22 13:02 Bug: Xen panics with #UD in acpi_processor_idle() Rafal Wojtczuk
2010-11-22 14:04 ` Jan Beulich
2010-11-22 15:15 ` Keir Fraser
2010-11-22 15:43 ` Rafal Wojtczuk [this message]
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