Re: Xen 4.4 development update: Is PVH a blocker?

[Sander Eikelenboom <linux@eikelenboom.it>]

Monday, December 16, 2013, 6:46:35 PM, you wrote:

> On Mon, Dec 16, 2013 at 06:24:20PM +0100, Sander Eikelenboom wrote:
>> 
>> Monday, December 16, 2013, 4:09:06 PM, you wrote:
>> 
>> >> >> * qemu-upstream not freeing pirq
>> >> >>  > http://www.gossamer-threads.com/lists/xen/devel/281498
>> >> >>  > http://marc.info/?l=xen-devel&m=137265766424502
>> >> >>  status: patches posted; latest patches need testing
>> >> >>  Not a blocker.
>> >> 
>> >> > I can't test it, b/c qemu-upstream does not work with PCI passthrough
>> >> > anymore.
>> >> 
>> >> Strange, pci passthrough in general works for me on "simple" pci devices (usb cards, videograbber) with latest qemu-upstream and seabios upstream.
>> >> (if you have no need for pci rombars, no vga passthrough, no need for specifying funky things about which virtual functions to passthrough)
>> >> 
>> >> What are you trying to passthrough ?
>> 
>> > -bash-4.1# lspci -s 01:00.0 -v 
>> > 01:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
>> >         Subsystem: Intel Corporation Gigabit ET Dual Port Server Adapter
>> >         Flags: fast devsel, IRQ 16
>> >         Memory at fbc20000 (32-bit, non-prefetchable) [disabled] [size=128K]
>> >         Memory at fb800000 (32-bit, non-prefetchable) [disabled] [size=4M]
>> >         I/O ports at e020 [disabled] [size=32]
>> >         Memory at fbc44000 (32-bit, non-prefetchable) [disabled] [size=16K]
>> >         Expansion ROM at fb400000 [disabled] [size=4M]
>> >         Capabilities: [40] Power Management version 3
>> >         Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
>> >         Capabilities: [70] MSI-X: Enable- Count=10 Masked-
>> >         Capabilities: [a0] Express Endpoint, MSI 00
>> >         Capabilities: [100] Advanced Error Reporting
>> >         Capabilities: [140] Device Serial Number 00-1b-21-ff-ff-45-d9-ac
>> >         Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
>> >         Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
>> >         Kernel driver in use: pciback
>> >         Kernel modules: igb
>> 
>> 
>> >> What problems do you have / errors do you see ?
>> >> 
>> 
>> > http://www.gossamer-threads.com/lists/xen/devel/309476?do=post_view_threaded
>> 
>> 
>> Could it be related to the outstanding issue (since 4.3) of:
>> 
>> * PCI hole resize support hvmloader/qemu-traditional/qemu-upstream with PCI/GPU passthrough
>>   > http://lists.xen.org/archives/html/xen-devel/2013-05/msg02813.html
>>   > Where Stefano writes:
>>   > 2) for Xen 4.4 rework the two patches above and improve
>>   > i440fx_update_pci_mem_hole: resizing the pci_hole subregion is not
>>   > enough, it also needs to be able to resize the system memory region
>>   > (xen.ram) to make room for the bigger pci_hole
>> 
>>   Your card seems to need quite some resources, and restricted to 32bit, even other SR-IOV cards seems to to with less and or support 32 bit.
>> 

> I don't think that is the problem. The QEMU-xen did work at some point - until
> I blew away 'qemu-xen-dir' to get the newest and best. So I think the problem
> I am seeing is with QEMU 1.6 regression.


Could try to get the latest upstream qemu and seabios patches then by changing your trees in Config.mk to the upstream qemu tree:

git://git.qemu.org/qemu.git

and

git://git.qemu.org/seabios.git
(at the extra config option questions, just except the defaults).

It's what i run at the moment, could be there is a off-chance there is a patch upstream that fixes your problem that's not in the xen qemu upstream tree yet.