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Re: [Xen-devel] Re: Regression in 3.1 causes Xen to use wrong idle routi
| To: | Len Brown <lenb@xxxxxxxxxx>, Stefan Bader <stefan.bader@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Re: Regression in 3.1 causes Xen to use wrong idle routine |
| From: | Keir Fraser <keir.xen@xxxxxxxxx> |
| Date: | Sun, 13 Nov 2011 16:59:10 +0000 |
| Cc: | "linux-acpi@xxxxxxxxxxxxxxx" <linux-acpi@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
| Delivery-date: | Sun, 13 Nov 2011 09:02:22 -0800 |
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| Thread-topic: | [Xen-devel] Re: Regression in 3.1 causes Xen to use wrong idle routine |
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On 13/11/2011 03:46, "Len Brown" <lenb@xxxxxxxxxx> wrote: >> The problem I see is that select_idle_routine() is called from >> arch/x86/kernel/cpu/common.c and since Xen setup does not set pm_idle >> anymore, it can cause mwait_idle or amd_e400_idle functions to be selected. >> In testing it seem amd_e400_idle in PVM domU at least does not immediately >> cause >> problems, but mwait_idle just causes crashes. From the reports I have >> this may be related to older hypervisors (3.1 and older) not clearing the >> mwait >> capability. But overall there seems something wrong in the interaction. > > Why is Xen advertising X86_FEATURE_MWAIT and then crashing > when the dom0 (or other guests) use what it advertises? > > What versions of Xen have this bug? Xen doesn't advertise MWAIT. Possibly Xen-pv_ops is lying to the rest of the kernel via the cpuid pv_ops hook. This would probably be because Xen is relying on the OSPM in dom0 kernel to parse out Cx/Px info which Xen itself *can* use. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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