44 lines
1.8 KiB
Diff
44 lines
1.8 KiB
Diff
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If the device at <secbus>:00.0 is the device the mapping operation was
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initiated for, trying to map it a second time will fail, and hence
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this second mapping attempt must be prevented (as was done prior to
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said c/s).
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Once at it, simplify the code a little, too.
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Signed-off-by: Jan Beulich <jbeulich@novell.com>
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--- a/xen/drivers/passthrough/vtd/iommu.c
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+++ b/xen/drivers/passthrough/vtd/iommu.c
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@@ -1371,23 +1371,16 @@ static int domain_context_mapping(struct
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if ( find_upstream_bridge(&bus, &devfn, &secbus) < 1 )
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break;
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- /* PCIe to PCI/PCIx bridge */
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- if ( pdev_type(bus, devfn) == DEV_TYPE_PCIe2PCI_BRIDGE )
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- {
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- ret = domain_context_mapping_one(domain, drhd->iommu, bus, devfn);
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- if ( ret )
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- return ret;
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+ ret = domain_context_mapping_one(domain, drhd->iommu, bus, devfn);
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- /*
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- * Devices behind PCIe-to-PCI/PCIx bridge may generate
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- * different requester-id. It may originate from devfn=0
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- * on the secondary bus behind the bridge. Map that id
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- * as well.
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- */
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+ /*
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+ * Devices behind PCIe-to-PCI/PCIx bridge may generate different
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+ * requester-id. It may originate from devfn=0 on the secondary bus
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+ * behind the bridge. Map that id as well if we didn't already.
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+ */
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+ if ( !ret && pdev_type(bus, devfn) == DEV_TYPE_PCIe2PCI_BRIDGE &&
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+ (secbus != pdev->bus || pdev->devfn != 0) )
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ret = domain_context_mapping_one(domain, drhd->iommu, secbus, 0);
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- }
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- else /* Legacy PCI bridge */
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- ret = domain_context_mapping_one(domain, drhd->iommu, bus, devfn);
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break;
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