Re: [Xen-devel] 3GB memory restriction for pv domU with NIC PCI Passthrough

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

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@xxxxxxxxxx> 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@xxxxxxxxxxxxx
> >> http://lists.xen.org/xen-devel
> >

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