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[Xen-devel] [PATCH] vtd: avoid redundant context mapping
| To: | 'Keir Fraser' <keir.fraser@xxxxxxxxxxxxx>, "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] vtd: avoid redundant context mapping |
| From: | "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> |
| Date: | Tue, 30 Dec 2008 17:02:26 +0800 |
| Accept-language: | zh-CN, en-US |
| Acceptlanguage: | zh-CN, en-US |
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| Delivery-date: | Tue, 30 Dec 2008 01:02:59 -0800 |
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| Thread-index: | AclqHdJXEecvnnr6Q+Ozl7bgkuAxJQALXwqQ |
| Thread-topic: | [PATCH] vtd: avoid redundant context mapping |
After changeset 18934 (VT-d: Fix PCI-X device assignment), my assigned PCI E1000 NIC doesn't work in guest. The NIC is 03:00.0. Its parent bridge is: 00:1e.0. In domain_context_mapping(): case DEV_TYPE_PCI: After we domain_context_mapping_one() 03:00.0 and 00:1e.0, the 'secbus' is 3 and 'bus' is 0, so we domain_context_mapping_one() 03:00.0 again -- this redundant invocation returns -EINVAL because we have created the mapping but haven't changed pdev->domain from Dom0 to a new domain at this time and eventually the XEN_DOMCTL_assign_device hypercall returns a failure. The attached patch detects this case and avoids the redundant invocation. Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>
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