Re: [Xen-users] VT-d CPU resources

["amiard brice" <perso@xxxxxxxxxxxxxxx>]

But as I said, my backplane ("motherboard extension") is composed with 4
bridge "PCI-e to PCI". And I have one domU for each "PCI-e to PCI bridge",
so according to the intel_VT-d pdf, it could be possible in my case to have
4 domU (one for each PCIe to PCI bridges).

In my opinion it could be due to the EPT table. In my "xm dmesg" I could see
"EPT not enable" and "CPU capabilities :  EPT table 2Mo", but I can't active
it (I've try different options in default/grub without succes)
 
(if devices behind the same pci bridges could not be allocated to different
VMs, it' simply because VT-d use specific interruption command call MSI-X in
aim to identify a domU, and those interruptions commands  could be possible
only with PCIe, you can have more information in the pdf intel VT-d).

thank you for your help in advance






Hi,

I've never been successful with VT-d-style pci delegation, but I read
devices behind pci bridges could not be allocated to different VMs in
earlier times.

Make sure this is supposed to work before you tackle the harder issues.

2012/6/22 amiard brice <perso@xxxxxxxxxxxxxxx>:
> Hello
>
>
>
> I'm working on XEN since one month now.
>
>
>
> I want create four domU with 2 PCI device per dom.
>
> I've bought a backplane with 3 bridges PCIe 1x to PCI and 4 PCI 
> directly connected to the PCH (Q67).
>
> (Moreover PCI card (ethernet card) are composed with a PCI bridge)
>
>
>
> I've succefuly created 4 domU with bakend devices, with option 
> "pci-backend-strict-check" disable.
>
> I?ve try with it but even if all PCI ports behind PCIe to PCI bridge 
> appears in  pci-list-assignable-devices, domU won?t start, with an 
> error message "device XX:XX.X need to be co-assigned with XX:XX.X, but 
> it's not owned by pci-backend
>
>
>
> The probleme is :  even if my domU are configuer with 1 VCPUs for each 
> of them, when domU acces to I/O devices, VCPUs aren't separated (I've 
> notice this using virt-manager charts). During a basic CPU benchmark 
> on a domU, VCPUs are isolated.
>
>
>
> I Have attached "lspci-v", "xm dmesg", "xm 
> pci-list-assignable-devices", "default-grub", "xm info" and a ?domU cfg
file?
>
>
>
> A share core is very problematic my RT application
>
>
>
> thank you for your help in advance
>
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users



--
the purpose of libvirt is to provide an abstraction layer hiding all xen
features added since 2006 until they were finally understood and copied by
the kvm devs.


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