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[Xen-devel] [PATCH] VT-d: improve RMRR validity checking
| To: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] VT-d: improve RMRR validity checking |
| From: | "Han, Weidong" <weidong.han@xxxxxxxxx> |
| Date: | Thu, 21 Jan 2010 10:46:12 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Delivery-date: | Wed, 20 Jan 2010 18:48:12 -0800 |
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| Thread-index: | AcqaQ+SKc4rglCVDSSiStbgvxJxlIA== |
| Thread-topic: | [Xen-devel] [PATCH] VT-d: improve RMRR validity checking |
Currently, Xen checks RMRR range and disables VT-d if RMRR range is set incorrectly in BIOS rigorously. But, actually we can ignore the RMRR if the device under its scope are not pci discoverable, because the RMRR won't be used by non-existed or disabled devices. This patch ignores the RMRR if the device under its scope are not pci discoverable, and only checks the validity of RMRRs that are actually used. In order to avoid duplicate pci device detection code, this patch defines a function pci_device_detect for it. Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
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