[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] multiple dom0s (was: Re: [Xen-devel] ragarding xen in sles10)
> On Sun December 9 2007 8:59:02 pm Mark Williamson wrote: > > c) compile pciback statically into the kernel and then put a pciback.hide > > directive onto your kernel command line and reboot > > CONFIG_XEN_BACKEND=y > CONFIG_XEN_BLKDEV_BACKEND=m > CONFIG_XEN_NETDEV_BACKEND=m > CONFIG_XEN_PCIDEV_BACKEND=m > CONFIG_XEN_PCIDEV_BACKEND_VPCI=y > > I have the above in my fedora xen kernel. Is that sufficient. (BTW, SuSE > has the first line as 'm' also.) This means that the PCI backend is built as a module (the additional XEN_PCIDEV_BACKEND_VPCI=y is just configuring an option, not building something statically into the kernel). You can still use PCI passthrough like that, but just putting pciback.hide on your kernel command line won't work - you'd need to pass them to the module at load time. Whatsmore, you need to make sure that pciback is able to claim those devices, which is only possible if they're not bound to another driver. So either you need to make sure pciback is loaded before other drivers for the hardware, or you need to unbind the hardware from whatever driver has grabbed it and then rebind it to pciback. There are some instructions at: http://wiki.xensource.com/xenwiki/Assign_hardware_to_DomU_with_PCIBack_as_module which may help you. I've not actually tested them myself but last time I looked through them they looked fairly sane. You ought to make sure you're familiar with the drawbacks and limitations of PCI passthrough before deploying it in production, as there are a few fairly significant caveats (e.g. that the domain with PCI hardware is effectively as privileged as dom0, since it can probably abuse that hardware to take over the machine if it acts maliciously). VT-d will probably help mitigate some of these limitations eventually - support for VT-d with HVM domains is already in xen-unstable, but not for PV yet, I think. Cheers, Mark -- Dave: Just a question. What use is a unicyle with no seat? And no pedals! Mark: To answer a question with a question: What use is a skateboard? Dave: Skateboards have wheels. Mark: My wheel has a wheel! _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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