linux-kernel - Re: [Xen-devel] [PATCH] xen/x86: actually allocate legacy interrupts on PV guests

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Date:	Mon, 16 May 2016 16:21:38 +0100 (BST)
From:	Stefano Stabellini <sstabellini@...nel.org>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
cc:	Stefano Stabellini <sstabellini@...nel.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Juergen Gross <jgross@...e.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH] xen/x86: actually allocate legacy interrupts
 on PV guests

On Mon, 16 May 2016, Boris Ostrovsky wrote:
> On 05/16/2016 07:23 AM, Stefano Stabellini wrote:
> > On Wed, 27 Apr 2016, Boris Ostrovsky wrote:
> >> On 04/27/2016 09:40 AM, David Vrabel wrote:
> >>> On 27/04/16 14:38, Boris Ostrovsky wrote:
> >>>> int xen_nr_legacy_irqs()
> >>>> {
> >>>>      if (xen_hvm_domain())
> >>>>          return nr_legacy_irqs();
> >>>>      if (xen_initial_domain())
> >>>>          return NR_IRQS_LEGACY;
> >>>>      return 0;
> >>>> }
> >>> Yeah, if that does the right thing...
> >> I think it will break xen_allocate_irq_gsi() again, unless we check for HVM
> >> domain explicitly. Which would be ugly.
> > I guess we all forgot about this patch, in the meantime the merge window
> > has opened.
> >
> > Should we go ahead with:
> >
> > http://marc.info/?l=linux-kernel&m=146115812124261&w=2
> >
> > ?
> > It might not be complete, but it is certainly an improvement.
> 
> Yes, I think what you have there is the best option. What I suggested
> above won't work and adding another check for HVM domain in 
> xen_allocate_irq_gsi() won't look good (although it does work).
> 
> It will need to go to stable as well (4.4+ ?)

All right, I'll commit it to for-linus-4.7 with
 Cc: stable@...r.kernel.org