From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: [RFC + Queries] Flow of PCI passthrough in ARM
Date: Mon, 6 Oct 2014 16:38:03 +0100
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To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Anup Patel <anup.patel@linaro.org>, Vijay Kilari <vijay.kilari@gmail.com>, Prasun Kapoor <prasun.Kapoor@caviumnetworks.com>, manish.jaggi@caviumnetworks.com, Julien Grall <julien.grall@linaro.org>, xen-devel <xen-devel@lists.xen.org>, psawargaonkar@linaro.org, Matt.Evans@arm.com, Dave.Martin@arm.com, manish jaggi <manishjaggi.oss@gmail.com>
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On Mon, 2014-10-06 at 15:11 +0100, Stefano Stabellini wrote:
> Actually the xen-pcifront driver in the guest knows the real PCI sbdf
> for the assigned device, not just the virtual slot. On x86 xen-pcifront
> makes an hypercall to enable msi/msix on the device passing the real
> sbdf as argument:
> 
> drivers/pci/xen-pcifront.c:pci_frontend_enable_msix
> 
> Could we use the same hypercall to enable msi/msix on ARM? That would be
> ideal.

That's not a hypercall, it's a message to pciback.

And I think it takes the virtual BDF, since pciback knows how to
translate such things.

> Otherwise xen-pcifront could call a new hypercall to let Xen know the
> virtual sbdf to sbdf mapping. But I would prefer not to introduce a new
> hypercall and reuse the existing one.

Ian.