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.ker...@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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