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[Xen-devel] RE: Resend: RE: enable_ats_device() call site
| To: | Jan Beulich <JBeulich@xxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] RE: Resend: RE: enable_ats_device() call site |
| From: | "Kay, Allen M" <allen.m.kay@xxxxxxxxx> |
| Date: | Mon, 22 Aug 2011 15:01:29 -0700 |
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| Acceptlanguage: | en-US |
| Cc: | Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Mon, 22 Aug 2011 15:04:21 -0700 |
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| Thread-index: | AcxeUdki2yWUrBygQZmG/6rNwXipRACxBs3Q |
| Thread-topic: | Resend: RE: enable_ats_device() call site |
>And why is it VT-d specific then? The problem to solve is that enabling >may not happen when it is first attempted, in the case where Xen on its >own can't be certain that using MMCFG is safe. Hence when the device >gets reported by Dom0 (or when MMCFG gets enabled for the respective >bus), another attempt needs to be made at enabling it. De-assigning and >then re-assigning the device to Dom0 seems to be overkill to me. The part that is VT-d specific is ATS capability reporting in ACPI DMAR table for reporting ATS capability in root ports. I not so clear on what do you mean by making another attempt when initial ATS enabling attempt fails. Do you have a patch to address this issue? Allen _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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