Bug 484148
Summary: | VTd: changeset 10 of 16: avoid redundant context mapping | ||||||
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Product: | Red Hat Enterprise Linux 5 | Reporter: | Don Dugger <ddugger> | ||||
Component: | kernel-xen | Assignee: | Xen Maintainance List <xen-maint> | ||||
Status: | CLOSED WONTFIX | QA Contact: | Martin Jenner <mjenner> | ||||
Severity: | medium | Docs Contact: | |||||
Priority: | low | ||||||
Version: | 5.4 | CC: | knoel, xen-maint | ||||
Target Milestone: | rc | ||||||
Target Release: | 5.4 | ||||||
Hardware: | All | ||||||
OS: | Linux | ||||||
Whiteboard: | |||||||
Fixed In Version: | Doc Type: | Bug Fix | |||||
Doc Text: | Story Points: | --- | |||||
Clone Of: | Environment: | ||||||
Last Closed: | 2009-02-05 15:23:43 UTC | Type: | --- | ||||
Regression: | --- | Mount Type: | --- | ||||
Documentation: | --- | CRM: | |||||
Verified Versions: | Category: | --- | |||||
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
Cloudforms Team: | --- | Target Upstream Version: | |||||
Embargoed: | |||||||
Bug Depends On: | 484147 | ||||||
Bug Blocks: | 331741, 484150 | ||||||
Attachments: |
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Process error, don't need a separate BZ per patch |
Created attachment 330942 [details] avoid redundant context mapping Description of patch: In case DEV_TYPE_PCI in domain_context_mapping(), redundant context mapping may occur for some devices. For example, the NIC is 03:00.0, and its parent bridge is: 00:1e.0. After domain_context_mapping_one() 03:00.0 and 00:1e.0, the 'secbus' is 3 and 'bus' is 0, so will 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. This patch detects this case and avoids the redundant invocation. Upstream Status: Accepted (CS 18964)