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[Xen-devel] Re: [PATCH][VTD] force boot to fail if interrupt remapping c
| To: | "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [PATCH][VTD] force boot to fail if interrupt remapping cannot be enabled when iommu=force |
| From: | Keir Fraser <keir.xen@xxxxxxxxx> |
| Date: | Thu, 28 Apr 2011 18:05:03 +0100 |
| Cc: | "Cihula, Joseph" <joseph.cihula@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx> |
| Delivery-date: | Thu, 28 Apr 2011 10:06:05 -0700 |
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| Thread-topic: | [PATCH][VTD] force boot to fail if interrupt remapping cannot be enabled when iommu=force |
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On 28/04/2011 00:42, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote: > Force Xen boot to fail if interrupt remapping fails to enable and the > following are true: iommu=force is set as xen boot parameter, VT-d engine HW > is interrupt remapping capable, DMAR_INTR_REMAP bit is set in DMAR flags. > This forces iommu=force boot instances has interrupt remapping enabled if HW > and BIOS supports it. If HW and BIOS support it, why would it fail to be enabled? This doesn't look like a particularly useful panic() path. If interrupt remapping is so important, perhaps iommu=force should unconditionally require it, and panic in its absence regardless of platform features? As it is, this looks like a panic that is never realistically going to trigger. -- Keir > Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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