Re: [Xen-devel] How to register a 64 bit BAR

["Zytaruk, Kelly" <Kelly.Zytaruk@xxxxxxx>]

Thanks Pasi, I will check it out.

Kelly

> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx]
> Sent: Wednesday, September 24, 2014 9:06 AM
> To: Zytaruk, Kelly
> Cc: Anthony PERARD; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] How to register a 64 bit BAR
> 
> On Wed, Sep 24, 2014 at 03:57:58PM +0300, Pasi Kärkkäinen wrote:
> > On Wed, Sep 24, 2014 at 12:47:01PM +0000, Zytaruk, Kelly wrote:
> > > Thanks Anthony, you have saved me hours of searching through the source
> code.
> > >
> > > I am working with Xen 4.2 qemu-traditional.  I checked the source
> > > code for upstream xen (qemu-xen-dir) and I didn't even find any
> > > support for the pci_register_io_region() function.  Apparently BAR
> > > remapping callbacks aren't supported in this version.  This is most
> > > unfortunate :-(
> > >
> >
> > Hmm.. I wonder if this old patch would be of any help?
> >
> > http://lists.xen.org/archives/html/xen-devel/2012-08/msg01168.html
> >
> 
> And the two other patches from the "xen/tools: Add 64 bits big bar support"
> thread (3 patches total).
> 
> 
> -- Pasi
> 
> >
> > > Thanks for the help,
> > > Kelly
> > >
> > > > -----Original Message-----
> > > > From: Anthony PERARD [mailto:anthony.perard@xxxxxxxxxx]
> > > > Sent: Wednesday, September 24, 2014 5:53 AM
> > > > To: Zytaruk, Kelly
> > > > Cc: xen-devel@xxxxxxxxxxxxx
> > > > Subject: Re: [Xen-devel] How to register a 64 bit BAR
> > > >
> > > > On Tue, Sep 23, 2014 at 08:33:08PM +0000, Zytaruk, Kelly wrote:
> > > > > I have used pci_register_io_region() to register 32 bit BARs but
> > > > > how do I
> > > > register a 64 bit BAR?
> > > > >
> > > > > Let's say my region uses BAR 2 and BAR 3 for a 64 bit address.
> > > > > Do I register them separately as in
> > > > >
> > > > > pci_register_io_region (dev, 2, region_size,
> > > > > PCI_ADDRESS_SPACE_MEM, &my_func); pci_register_io_region (dev,
> > > > > 3, region_size, ???, &my_func);
> > > >
> > > > No, that would register two different BARs.
> > > >
> > > > > What would I specify as a region type for BAR 3?
> > > >
> > > > Nothing, since you don't want two different BARs.
> > > >
> > > > > Or is QEMU smart enough for me to register just BAR 2 and it
> > > > > will know
> > > > somehow that it is a 64 bit BAR?
> > > >
> > > > Nop.
> > > >
> > > > > I also want to call cpu_register_physical_memory() from within
> > > > > the callback
> > > > but the callback only takes a uint32_t as a physical address.
> > > > > I am having difficulty finding an example that uses a 64 bit BAR 
> > > > > address.
> > > >
> > > > Look for where PCI_ADDRESS_SPACE_MEM is define, and you will find
> > > > how to register a 64bit BAR.
> > > > Unless your are speaking about qemu-traditional and I'm not sure
> > > > that is possible.
> > > >
> > > > After looking in the source code of qemu-traditional, it does not
> > > > appear to support 64bit BAR. Only QEMU upstream handle them (also
> called qemu-xen).
> > > >
> > > > --
> > > > Anthony PERARD
> > >
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxx
> > > http://lists.xen.org/xen-devel
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel

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