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SubjectRE: [PATCH] interrupt remapping: Disallow interrupt remapping if not all ioapic under interrupt remapping

This patch also is promising to go to 2.6.32.

Thanks & Regards,
Song Youquan
Intel SSG/SSD/OTC
MOB: 13681289076
TEL: 010-82171326
INET: 8-758-1326
LOC: Raycom 5W027




> -----Original Message-----
> From: Siddha, Suresh B
> Sent: 2009年9月10日 5:43
> To: Song, Youquan
> Cc: mingo@elte.hu; hpa@zytor.com; tglx@linutronix.de;
> linux-kernel@vger.kernel.org; dwmw2@infradead.org
> Subject: Re: [PATCH] interrupt remapping: Disallow interrupt
> remapping if not all ioapic under interrupt remapping
>
> On Mon, 2009-09-07 at 07:58 -0700, Song, Youquan wrote:
> > Current kernel enable interrupt remapping only when all the
> vt-d unit support
> > interrupt remapping. So it is reasonable we should also
> disallow enabling
> > intr-remapping if there any io-apics that are not listed
> under vt-d units.
> > Otherwise we can run into issues.
> >
> > Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
> > Signed-off-by: Youquan Song <youquan.song@intel.com>
> > ---
> >
> > diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
> > index 7b287cb..a8a4383 100644
> > --- a/drivers/pci/dmar.c
> > +++ b/drivers/pci/dmar.c
> > @@ -570,9 +570,6 @@ int __init dmar_table_init(void)
> > printk(KERN_INFO PREFIX "No ATSR found\n");
> > #endif
> >
> > -#ifdef CONFIG_INTR_REMAP
> > - parse_ioapics_under_ir();
> > -#endif
> > return 0;
> > }
> >
> > diff --git a/drivers/pci/intr_remapping.c
> b/drivers/pci/intr_remapping.c
> > index 4f5b871..ebfa47b 100644
> > --- a/drivers/pci/intr_remapping.c
> > +++ b/drivers/pci/intr_remapping.c
> > @@ -626,6 +626,11 @@ int __init enable_intr_remapping(int eim)
> > struct dmar_drhd_unit *drhd;
> > int setup = 0;
> >
> > + if (parse_ioapics_under_ir() != 1) {
> > + printk(KERN_INFO "Not enable interrupt remapping\n");
> > + return -1;
> > + }
> > +
> > for_each_drhd_unit(drhd) {
> > struct intel_iommu *iommu = drhd->iommu;
> >
>
> David, Can you also pick this up please?
>
> thanks,
> suresh
>
>
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