Re: [Qemu-devel] [PATCH 1/2] KVM userspace: Add PCI device passthrough support

[Dor Laor <dor.laor-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Fabrice Bellard wrote:
>
> Hi,
>
> Some remarks:
>
> - rename the option to -pcidevice.
>
> - Remove the directory passthrough and put the file directly in hw/.
> Rename the file to something more explicit such as pci_passthrough*
>
> - Suppress the files passthrough.h and neo_pci_tree.h
>
> - pt_init should be called only if there are really devices. Moreover
> the code should be disabled for non Linux hosts.
>
> Can this support work if KVM is not used for CPU emulation ? Can it work
> for non x86 targets ?
>
This patchset can work without kvm (although not tested). It can do so 
using a kernel module
that forwards irqs to userspace. I'm not sure it will make it into Linux 
kernel since it allows userspace
irq handling. We actually try to convert the current patch to our 
in-kernel apic version that won't forward
irqs to userspace and hence won't work without kvm. If you're interested 
in pass through to qemu/kqemu
(seems like a cool feature) we can try to support both.
Dor.
>
> Regards,
>
> Fabrice.
>
> Amit Shah wrote:
> > This patch introduces support for device passthrough
> > from the host to a paravirtualized guest.
> >
> > A new command-line option, -passthrough is added.
> > For example, to invoke it for an Ethernet device sitting at
> > PCI bus:dev.fn 04:08.0 with host IRQ 18, use this:
> >
> > -passthrough Ethernet/04:08.0-18
> >
> > The host driver is to be removed before doing the passthrough.
> >
>


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