[Xen-devel] [xen-unstable] [qemu-xen] pci passthrough msi-x returns same pirq

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hi Stefano / Anthony,

With the debug output turned on i see some difference between qemu-traditional 
and qemu-upstream:

With the pci passthroughed device that fails with msi-x, in qemu-xen it seems 
to get the same pirq back for every entry

in qemu-traditional:

pt_msix_update_one: pt_msix_update_one requested pirq = 87
pt_msix_update_one: Update msix entry 0 with pirq 57 gvec 0
pt_msix_update_one: pt_msix_update_one requested pirq = 86
pt_msix_update_one: Update msix entry 1 with pirq 56 gvec 0
pt_msix_update_one: pt_msix_update_one requested pirq = 85
pt_msix_update_one: Update msix entry 2 with pirq 55 gvec 0
pt_msix_update_one: pt_msix_update_one requested pirq = 84
pt_msix_update_one: Update msix entry 3 with pirq 54 gvec 0


in qemu-xen (upstream):

[00:05.0] msi_msix_setup: requested pirq 4 for MSI-X (vec: 0, entry: 0)
[00:05.0] msi_msix_update: Updating MSI-X with pirq 4 gvec 0 gflags 0x3057 
(entry: 0)
[00:05.0] msi_msix_setup: requested pirq 4 for MSI-X (vec: 0, entry: 0x1)
[00:05.0] msi_msix_update: Updating MSI-X with pirq 4 gvec 0 gflags 0x3056 
(entry: 0x1)
[00:05.0] msi_msix_setup: requested pirq 4 for MSI-X (vec: 0, entry: 0x2)
[00:05.0] msi_msix_update: Updating MSI-X with pirq 4 gvec 0 gflags 0x3055 
(entry: 0x2)
[00:05.0] msi_msix_setup: requested pirq 4 for MSI-X (vec: 0, entry: 0x3)
[00:05.0] msi_msix_update: Updating MSI-X with pirq 4 gvec 0 gflags 0x3054 
(entry: 0x3)

--
Sander


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