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

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

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.