[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking
On Tue, Mar 09, 2010 at 02:57:00PM -0700, Alex Williamson wrote: > On Tue, Mar 9, 2010 at 2:30 PM, Konrad Rzeszutek Wilk > <konrad.wilk@xxxxxxxxxx> wrote: > > On Tue, Mar 09, 2010 at 02:39:10PM -0700, Alex Williamson wrote: > >> > >> I have a system with what I consider to be a valid DRHD that's getting > >> tripped up on this patch. The problem is that the DRHD includes an > >> IOAPIC scope, where the IOAPIC is not materialized on the PCI bus. I > >> think Xen is being overzealous in it's validity checking and that this > >> is a valid configuration. What do others think? Are IOAPICs a > > > > How does upstream Linux handle this? > > Last I checked, it works just fine, doesn't care that the IOAPIC isn't > materialized. This is from drivers/pci/intr_remapping.c (2.6.34-rc0): 795 if (ir_supported && ir_ioapic_num != nr_ioapics) { 796 printk(KERN_WARNING 797 "Not all IO-APIC's listed under remapping hardware\n"); 798 return -1; 799 } 800 ir_ioapic_num is figured out from the count of DRHD's. So I think Linux would actually turn off VT-d. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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