Re: [Xen-devel] Limitation in HVM physmap

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Nov 04, 2013 at 03:08:25PM +0100, Fabio Fantoni wrote:
> Il 04/11/2013 13:17, Wei Liu ha scritto:
> >On Mon, Nov 04, 2013 at 01:05:39PM +0100, Fabio Fantoni wrote:
> >>Il 04/11/2013 12:42, Wei Liu ha scritto:
> >>>On Mon, Nov 04, 2013 at 10:28:57AM +0100, Fabio Fantoni wrote:
> >>>[...]
> >>>>Could be a similar problem on qxl too?
> >>>>On latest debug about qxl time ago I found this error on domU's log:
> >>>>>ioremap error for 0xfc001000-0xfc002000, requested 0x10, got 0x0
> >>>>For details see the full post:
> >>>>
> >>>>If you need more informations and/or tests tell me and I'll post them.
> >>>>Thanks for any reply.
> >>>Is OVMF involved? If not then I don't think it's related.
> >>>
> >>>Wei.
> >>No, this was with seabios.
> >>With ovmf qxl seems to have the same critical general performance
> >>problem of stdvga already reported days ago.
> >>On my tests at the moment with me ovmf start properly only with
> >>Saucy using cirrus video card but when arriveto the DE has very poor
> >>graphics performance (not usable).
> >I need to fix underlying issues before attending performance related
> >ones.
> >
> 
> If can be useful on attachment logs of Fedora19 domU with ovmf and qxl vga.
> 
> On ovmf test I see that is missed the ioremap error present on seabios test.
> 
> If these data are useless sorry for the trouble.

There's a workaround for Cirrus not working correctly. Add pci=nocrs in
your Linux command line. But it's just a workaround, a proper fix is
still to be determined.

Wei.

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