[Xen-devel] [PATCH 0/6] Add MSI support to XEN

["Shan, Haitao" <haitao.shan@xxxxxxxxx>]

Hi, Keir,

 

    These patches are  modified  version of  the patches I sent about one month before. These patches enable MSI support and limited MSI-X support in XEN.

 

The basic idea including:
1) Keep vector global resource owned by xen, while split pirq into per-domain information.
2) Domain0 kernel will operate msi resource for domain0/domU, while QEMU will operate MSI resource for HVM domain. 

3) MSI/MSI-X capabilities are setup by Xen, Dom0 sees MSI as normal PIRQ. 

4) MSI interrupts are handled like normal edge-triggered interrupts. 

 From my tests, I did not encounter MSI storm.

 

Per patch discription:

move_pci_function.patch

    move some function and header files to generic places that are needed by MSI.

pirq_per_domain.patch

    changes pirq to per-domain 

msi_irq_xen.patch

    add MSI/MSI-X support to Xen. Most code is ported from 2.6.24.4 kernel.

msix_permission.patch

    remove io_mem permission for MSI-X, since MSI-X facilities are allocted through and located in PCI BAR.

msi_passthrough.patch

    add MSI support to HVM domain.

msi_kernel.patch

    add MSI/MSI-X support for PV domains including dom0. 
 

    What is your comments on the patches, Keir?

   

Thanks!

Haitao Shan

 

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