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IOMMU: Handle sibling device assignment correctly (re-send)

Wei Wang2 xen-devel 1 version In review

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  1. v1 Latest2 patches 3 repliesIn review

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#Subject and filesSizeRepliesApplied
1/2IOMMU: Handle sibling device assignment correctly (re-send)xen/arch/x86/domctl.c xen/drivers/passthrough/amd/pci_amd_iommu.c xen/drivers/passthrough/iommu.c +3 more+101 -10 replies
2/2IOMMU: Handle sibling device assignment correctly (re-send)tools/libxc/xc_domain.c tools/libxc/xenctrl.h tools/python/xen/lowlevel/xc/xc.c +1 more+146 -00 replies

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Cover letter [PATCH 0/2] IOMMU: Handle sibling device assignment correctly (re-send)

This patch set is revised according to comments from community. Domctl interface is extended to allow libxc retrieve device group information from hypervisor. Vendor-specific iommu_ops is also extended by adding a new operation "get_device_group_id()", which is currently a null pointer but could be implemented later for vt-d.

Error will be raised from tools side when user trying to assign PCI device with a sibling device being driven by dom0. User will keep being prompted until he has hidden the entire device group (at least, the sibling devices driven by dom0) in dom0 kernel parameter. Hopefully this framework could be flexible enough to support both amd iommu and vt-d.

The following 2 cases are not covered by this patch, but should be easy to handle.
* Checking for hot-plug devices (maybe we can delay calling ImageHandler.signalDeviceModel() until all checks are done?)
* Checking for splitted device group between different passthru domains

Looking forward to your comments, thanks!

Wei

Signed-off-by Wei Wang <[email protected]>
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AMD Saxony, Dresden, Germany
Operating System Research Center

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