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

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

Hi, Keir,
    
    Resend this mail as plain text mail. Sorry for my mistake.
    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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