Re: [Xen-devel] [PATCH] Register PV driver product numbers 4 and 5.

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Sander Eikelenboom [mailto:linux@xxxxxxxxxxxxxx]
> Sent: 09 October 2013 10:10
> To: Ian Campbell
> Cc: Paul Durrant; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH] Register PV driver product numbers 4 and
> 5.
> 
> 
> Wednesday, October 9, 2013, 10:00:53 AM, you wrote:
> 
> > On Tue, 2013-10-08 at 15:53 +0100, Paul Durrant wrote:
> 
> >> > It's a bit confusing, I agree. Referring back to previous threads though,
> all
> >> > HVM systems are assumed to have the xen platform PCI device (as
> there is
> >> > no way to turn it off if youâre using machine type xenfv), thus the fixed
> IO
> >> > ports that implement the blacklisting protocol are assumed to always be
> >> > present. Because the ports are fixed and always present the PV drivers
> don't
> >> > have to care which device they are binding to - they talk to the same IO
> ports
> >> > regardless.
> 
> Paul,
> 
> Do you by any chance know the commit that made this unconditional ?
> (it used to be possible to switch it off with xen_platform_pci=0, and i'm 
> trying
> to see
> if the platform device and the hidden NIC (pci 00:03.0 not visible in guest 
> lspci
> but it's there
> (xl dmesg reports it begin generate and there is a gap in the device number
> (platform 00:02.0 passthroughed device 00:04.0) has something to do with it.
>

Sander,

  It wasn't a commit that did this as such, it's just that no-one added the 
option to turn it off in upstream QEMU. I believe you can still turn it off if 
you're using trad QEMU.
 
> The rom bar of my passthroughed device some how gets wired at first to the
> vga bios of the cirrus vga or stdvga.
> When i disable the emulated vga (-nographic and -vga none) it is suddenly
> wired to the ixpe rom (of device 00:03.0).
> 
> So there is something funky going on in either hvmloader, seabios and/or
> qemu.

Yes, that sounds very funky.

  Paul

> But it would be nice to rule out as much as possible.
> 
> --
> Sander
> 
> > That makes sense I suppose.
> 
> > Can we add some words about this relationship to the docs then?
> 
> >> Ping? Do I need to add any further clarification?
> 
> > I thought I'd already replied but I don't see it anywhere on the list or
> > in my sent box, sorry.
> 
> > Ian/
> 
> 
> 

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