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Re: [vfio-users] vfio passthrough devices behind pcie switcher problem

two gpus share the same irq , i found the reason. because the msi be disabled later , so irq 140 is being reused.

but i don't know why somebady calls vfio_pci_ioctl to disable the msi.

2017-03-08 10:55 GMT+08:00 rhett rhett <rhett kernel gmail com>:
i have a question about vfio , here is my description.

i have 8 gpus in my server machine ,  but they are all behind a pcie bridge.  when i make a vfio passthrough , i can't use the gpus in my guest os.
dmesg shows the following message

[  662.208072] vfio-pci 0000:87:00.0: irq 140 for MSI/MSI-X
[  725.761623] vfio-pci 0000:04:00.0: irq 140 for MSI/MSI-X

i started two vm , one use 87 and another use 04,  dmesg shows that they share the same irq 140 . is this normal ?

i also saw the iommu groups, each gpu stays in a separate group, and with no other device in group. so this means 
ACS works correctly ?

hope to get your helps !

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