i have two guest , a windows 2008 server and a centos 7.2 . in windows, the device manager said the gpu can't start ,error code 10. in centos, when i run nvidia-smi, it said no device found.
no specil vm configurations, whit the same config, i can use gpu successfully in my two gpu server. the biggest different is , that server is no pcie switcher. 2017-03-08 11:55 GMT+08:00 Alex Williamson <alex.william...@redhat.com>: > On Wed, 8 Mar 2017 11:26:17 +0800 > rhett rhett <rhett.ker...@gmail.com> wrote: > > > 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. > > vfio just does what the guest requests, but you're really providing > hardly any more information than when you asked off list. My wild > guess, is that maybe you're running a Windows guest and not configuring > the VM for a vCPU type where Windows supports MSI. For more > assistance, please provide basic information, like the QEMU command > line or VM XML, also the PCI information from the host (sudo lspci > -vvv), and of course any error codes in the guest or an actual > description of how the device doesn't work in the guest. Thanks, > > Alex > > > > 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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