From: Simon Horman <horms@verge.net.au>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: Yuji Shimada <shimada-yxb@necst.nec.co.jp>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>
Subject: Re: [rfc 00/18] ioemu: use devfn instead of slots as the unit for passthrough
Date: Thu, 5 Mar 2009 09:53:22 +1100 [thread overview]
Message-ID: <20090304225322.GA1000@verge.net.au> (raw)
In-Reply-To: <C5D4B1EB.42F5%keir.fraser@eu.citrix.com>
On Wed, Mar 04, 2009 at 10:32:11PM +0000, Keir Fraser wrote:
> On 04/03/2009 22:26, "Simon Horman" <horms@verge.net.au> wrote:
>
> >> Please note that _PRT method in ACPI AML should reflect GSIs. If you expand
> >> GSIs, it will be necessary to change the _PRT method. Please see
> >> tools/firmware/hvmloader/acpi/dsdt.asl.
> >
> > Could someone explain why the current code uses 32 GSIs rather than using 128?
>
> 32 should be plenty, and I'd want to emulate multiple IO-APICs beyond that
> just out of fear that some OS will choke on an IO-APIC with 128 pins (since
> no real single IO-APIC has so many pins). It just seemed a bit unnecessary
> when this support was originally implemented. At this point I haven't heard
> any concrete evidence so far that 32 GSIs is insufficient in any real
> scenario. So that's what we'll be sticking with for the time being, I think.
Thanks, I will see if I can dig out any real-world reasons.
--
Simon Horman
VA Linux Systems Japan K.K., Sydney, Australia Satellite Office
H: www.vergenet.net/~horms/ W: www.valinux.co.jp/en
next prev parent reply other threads:[~2009-03-04 22:53 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-17 9:07 [rfc 00/18] ioemu: use devfn instead of slots as the unit for passthrough Simon Horman
2009-02-17 9:07 ` [rfc 01/18] Make register_real_device() and unregister_real_device() static Simon Horman
2009-02-17 9:07 ` [rfc 02/18] Make dpci_infos static Simon Horman
2009-02-17 9:07 ` [rfc 03/18] ioemu: vslots needs to be freed on error in power_off_php_slot() Simon Horman
2009-02-17 9:07 ` [rfc 04/18] ioemu: Remove lsi_scsi_init()s devfn parameter as it is always passed as -1 Simon Horman
2009-02-17 9:07 ` [rfc 05/18] " Simon Horman
2009-02-17 9:07 ` [rfc 06/18] ioemu: Remove usb_ohci_init*()s devfn parameter as they are " Simon Horman
2009-02-17 9:07 ` [rfc 07/18] iommu: Define PCI_DEVFN_AUTO and use it Simon Horman
2009-02-17 9:07 ` [rfc 08/18] iommu: Use PCI_DEVFN to create devfn numbers Simon Horman
2009-02-17 9:07 ` [rfc 09/18] ioemu: piix4acpi.c: make various variables static Simon Horman
2009-02-17 9:07 ` [rfc 10/18] ioemu: piix4acpi.c: Simplfy PHPSlots structure Simon Horman
2009-02-17 9:07 ` [rfc 11/18] ioemu: piix4acpi.c: Consistently dont cast opaque to PHPSlots Simon Horman
2009-02-17 9:08 ` [rfc 12/18] ioemu: piix4acpi.c: remove unnecessary assignment of pci_slots to local variables Simon Horman
2009-02-17 9:08 ` [rfc 13/18] ioemu: piix4acpi.c: remove ACPI_PHP_SLOT_NUM Simon Horman
2009-02-17 9:08 ` [rfc 14/18] ioemu: use devfn instead of slots as the unit for passthrough Simon Horman
2009-02-17 9:08 ` [rfc 15/18] ioemu: use struct php_dev to pass around PCI pass-through assignment parameters Simon Horman
2009-02-17 9:08 ` [rfc 16/18] ioemu: non-destructive parsing of PCI assignement strings Simon Horman
2009-02-17 9:08 ` [rfc 17/18] ioemu: sort pass-through PCI devices before inserting Simon Horman
2009-02-17 9:08 ` [rfc 18/18] ioemu: Allow virtual function to be speficied for PCI pass-through Simon Horman
2009-02-17 12:03 ` [rfc 00/18] ioemu: use devfn instead of slots as the unit for passthrough Ian Jackson
2009-02-17 22:24 ` Simon Horman
2009-02-18 3:12 ` Yuji Shimada
2009-02-19 6:15 ` Simon Horman
2009-02-19 9:21 ` Yuji Shimada
2009-02-19 9:38 ` Keir Fraser
2009-02-20 7:07 ` Simon Horman
2009-02-23 6:24 ` Yuji Shimada
2009-02-23 6:55 ` Simon Horman
2009-02-23 8:39 ` Yuji Shimada
2009-02-23 9:33 ` Simon Horman
2009-02-23 11:31 ` Keir Fraser
2009-02-23 22:18 ` Simon Horman
2009-03-02 4:14 ` Simon Horman
2009-03-02 8:44 ` Keir Fraser
2009-03-02 9:53 ` Simon Horman
2009-03-02 10:08 ` Keir Fraser
2009-03-02 11:25 ` Simon Horman
2009-03-02 11:33 ` Keir Fraser
2009-03-03 5:57 ` Yuji Shimada
2009-03-03 8:56 ` Keir Fraser
2009-03-04 22:26 ` Simon Horman
2009-03-04 22:32 ` Keir Fraser
2009-03-04 22:53 ` Simon Horman [this message]
2009-03-04 23:05 ` Simon Horman
2009-03-05 8:34 ` Keir Fraser
2009-03-05 9:05 ` Simon Horman
2009-03-05 9:22 ` Keir Fraser
2009-03-05 9:42 ` Simon Horman
2009-03-06 1:29 ` Yuji Shimada
2009-03-06 2:46 ` Simon Horman
2009-03-06 6:55 ` Yuji Shimada
2009-03-06 8:19 ` Keir Fraser
2009-03-06 8:15 ` Keir Fraser
2009-03-05 9:26 ` Keir Fraser
2009-03-05 9:31 ` Jiang, Yunhong
2009-03-05 9:57 ` Simon Horman
2009-03-05 10:13 ` Simon Horman
2009-03-05 12:44 ` Keir Fraser
2009-03-05 14:47 ` Jiang, Yunhong
2009-03-05 9:41 ` Simon Horman
2009-02-24 1:29 ` Ian Pratt
2009-02-24 1:50 ` Simon Horman
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