Re: pv-grub guest booting fail with recent qemu-xen

[Wei Liu <wei.liu2@citrix.com>]

On Tue, Apr 12, 2016 at 01:56:50AM +0000, Hao, Xudong wrote:
> > -----Original Message-----
> > From: Wei Liu [mailto:wei.liu2@citrix.com]
> > Sent: Monday, April 11, 2016 6:54 PM
> > To: Samuel Thibault <samuel.thibault@ens-lyon.org>; Wei Liu
> > <wei.liu2@citrix.com>; Hao, Xudong <xudong.hao@intel.com>; Konrad
> > Rzeszutek Wilk <konrad.wilk@oracle.com>; xen-devel@lists.xen.org;
> > stefano.stabellini@eu.citrix.com; Anthony PERARD <anthony.perard@citrix.com>
> > Subject: Re: [Xen-devel] pv-grub guest booting fail with recent qemu-xen
> > 
> > On Sun, Apr 10, 2016 at 10:14:46PM +0200, Samuel Thibault wrote:
> > > Hello,
> > >
> > > > > > > +    if (prod - out_cons >= XENFB_OUT_RING_LEN) {
> > > > > > > +        return;
> > > > > > > +    }
> > >
> > > This test seems overzealous to me: AIUI, the producer can produce
> > > XENFB_OUT_RING_LEN events, and thus prod - out_cons is exactly
> > > XENFB_OUT_RING_LEN, i.e. there is no room left at all.
> > >
> > > The frontend part is:
> > >
> > >    while (page->out_prod - page->out_cons == XENFB_OUT_RING_LEN)
> > >         schedule();
> > >
> > > I.e. it waits while the buffer is exactly full.
> > >
> > > So it seems to me the bug is at the backend side.
> > >
> > 
> > OK, thanks for checking!
> > 
> > Hudong, can you try the following diff?
> 
> Yes, This patch works with testing. 
> 

Thanks for testing!

I will submit this patch properly.

Wei.

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