Re: [Xen-devel] qemu-xen-dir + PCI passthrough = BOOM

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Dec 06, 2013 at 04:03:10PM +0000, Wei Liu wrote:
> On Fri, Dec 06, 2013 at 04:00:18PM +0000, Wei Liu wrote:
> [...]
> > > Those Xen report something like:
> > > (XEN) page_alloc.c:1460:d0 Over-allocation for domain 46: 131329 >
> > > 131328
> > > (XEN) memory.c:132:d0 Could not allocate order=0 extent: id=46
> > > memflags=0 (62 of 64)
> > > 
> > > ?
> > > 
> > > (I tryied to reproduce the issue by simply add many emulated e1000 in
> > > QEMU :) )
> > > 
> > 
> > FWIW this probably comes from XENMEM_populate_physmap. Simply speaking
> > your domain is exceeding memory limit...
> > 
> 
> And, if this comes from hvmloader it is not fatal. It will use lower
> memory to fill in the holes.

It says:

[  626.260261] d(d4) [2013-12-16 15:06:53] HVM Loader
evice vif4.0 ent(d4) [2013-12-16 15:06:53] Detected Xen v4.4-unstable
ered promiscuous(d4) [2013-12-16 15:06:53] Xenbus rings @0xfeffc000, event 
channel 3
 mode
(d4) [2013-12-16 15:06:53] System requested SeaBIOS
[  626.266706] x(d4) [2013-12-16 15:06:53] CPU speed is 3093 MHz
en_pciback: vpci(d4) [2013-12-16 15:06:53] Relocating guest memory for lowmem 
MMIO space disabled
: 0000:01:00.0: assign to virtual slot 0

And the device I am trying to pass in is:
-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



> 
> Wei.

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