Re: 3GB memory restriction for pv domU with NIC PCI Passthrough

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

On Thu, Apr 17, 2014 at 10:11:09AM +0800, topperxin wrote:
> Hi 
>      We have to use 4.1.5 now.
>      Is it possible to fix in xen 4.1.5? 

No.
>      If possible, could you please tell me how to modify in xen 4.1.5?

You would need to backport the 'e820_hole' patches. I did post on the xen-devel
at some point an version of them: see

http://lists.xen.org/archives/html/xen-devel/2012-03/msg02134.html
and
http://lists.xen.org/archives/html/xen-devel/2012-03/msg02131.html

>      Thanks a lot.  
> At 2014-04-16 21:08:14,"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com> wrote:
> >On Wed, Apr 16, 2014 at 10:55:18AM +0800, topperxin wrote:
> >> 
> >> 
> >> Hi
> >>   I met the same problem that you have already talked about.
> >>   I assigned 28 vCPUs , 4G memory, Intel 82599 VF to a PV domU VM.
> >>   I can not see the intel 82599 VF from lspci.
> >>  The xen version is 4.1.5
> >
> >Right. This is fixed in Xen 4.3. Please try that.
> >
> >>  please refer to the dmesg:
> >> =========================================================
> >> [    3.540273] pcifront pci-0: PCI host bridge to bus 0000:00
> >> [    3.540280] pci_bus 0000:00: root bus resource [io  0x0000-0xffff]
> >> [    3.540285] pci_bus 0000:00: root bus resource [mem 0x00000000-0x3fffffffffff]
> >> [    3.540291] pci_bus 0000:00: root bus resource [bus 00-ff]
> >> [    3.541343] pci 0000:00:00.3: [8086:10ed] type 00 class 0x020000
> >> [    3.542147] pci 0000:00:00.3: reg 0x10: [mem 0xdf904000-0xdf907fff 64bit]
> >> [    3.542816] pci 0000:00:00.3: reg 0x1c: [mem 0xdfa04000-0xdfa07fff 64bit]
> >> [    3.545523] pcifront pci-0: New device on 0000:00:00.3 found.
> >> [    3.551644] pcifront pci-0: claiming resource 0000:00:00.3/0
> >> [    3.551657] pci 0000:00:00.3: address space collision: [mem 0xdf904000-0xdf907fff 64bit] conflicts with System RAM [mem 0x00100000-0xffffffff]
> >> [    3.551662] pcifront pci-0: Could not claim resource 0000:00:00.3/0! Device offline. Try using e820_host=1 in the guest config.
> >> [    3.551682] pcifront pci-0: claiming resource 0000:00:00.3/3
> >> [    3.551688] pci 0000:00:00.3: address space collision: [mem 0xdfa04000-0xdfa07fff 64bit] conflicts with System RAM [mem 0x00100000-0xffffffff]
> >> [    3.551692] pcifront pci-0: Could not claim resource 0000:00:00.3/3! Device offline. Try using e820_host=1 in the guest config.
> >> [    3.743814] microcode: CPU19 sig=0x206d7, pf=0x1, revision=0x70a
> >> [    3.750305] microcode: CPU20 sig=0x206d7, pf=0x1, revision=0x70a
> >> [    3.756410] microcode: CPU21 sig=0x206d7, pf=0x1, revision=0x70a
> >> [    3.761506] ixgbevf: Intel(R) 10 Gigabit PCI Express Virtual Function Network Driver - version 2.7.12-k
> >> [    3.761513] ixgbevf: Copyright (c) 2009 - 2012 Intel Corporation.
> >> [    3.761650] ixgbevf 0000:00:00.3: device not available (can't reserve [mem 0xdf904000-0xdf907fff 64bit])
> >> [    3.761684] ixgbevf: probe of 0000:00:00.3 failed with error -22
> >> =========================================================
> >> 
> >> 
> >> At 2014-04-15 18:43:30,"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com> wrote:
> >> >On Tue, Apr 15, 2014 at 04:15:53PM +0800, topperxin wrote:
> >> >> Hi list
> >> >>      These I'm checking PCI Passthrough to PV domU, and I found when the memory larger than 3G, the PCI passthrough will not successfully. I got some information from the google. Some guys said it's a bug, and has already fixed, Why do I still meet this problem? What should I do?
> >> >
> >> >It should be fixed. Did you find any issues when doing PCI passthrough?
> >> >
> >> >> 
> >> >> 
> >> >> please refer to :
> >> >> 
> >> >> 
> >> >> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1673
> >> >> Bug 1673 - 3GB memory restriction for pv domU with PCI
> >> >> 
> >> >> 
> >> >> Thanks a lot.
> >> >
> >> >> _______________________________________________
> >> >> Xen-devel mailing list
> >> >> Xen-devel@lists.xen.org
> >> >> http://lists.xen.org/xen-devel
> >> >