[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] xl pci-attach silently fails the first time
Monday, December 1, 2014, 2:42:11 PM, you wrote: > On Mon, Dec 01, Olaf Hering wrote: >> > # xl pci-attach domU 0000:01:10.0 > "xl pci-attach -h" mentions [Virtual Slot], but the code does not seem > to handle an additional parameter, pciattach() ignores *vs. > What is the "Virtual Slot", why is it ignored? Hmm the wiki also still mentions it: http://wiki.xen.org/wiki/Xen_PCI_Passthrough It was the ability with xend + qemu-trad to be able to specify the slot to use in the guest for the pci device. See docs/misc/vtd.txt .. that seems it has never been updated :-) (together with passing through a multifunction devices as multifunction inside the guest this hasn't got implemented in neither libxl and qemu-xen.) -- Sander From docs/misc/vtd.txt: VTd device hotplug: ------------------- 2 virtual PCI slots (6~7) are reserved in HVM guest to support VTd hotplug. If you have more VTd devices, only 2 of them can support hotplug. Usage is simple: 1. List the VTd device by dom. You can see a VTd device 0:2:0.0 is inserted in the HVM domain's PCI slot 6. '''lspci''' inside the guest should see the same. [root@vt-vtd ~]# xm pci-list HVMDomainVtd VSlt domain bus slot func 0x6 0x0 0x02 0x00 0x0 2. Detach the device from the guest by the physical BDF. Then HVM guest will receive a virtual PCI hot removal event to detach the physical device [root@vt-vtd ~]# xm pci-detach HVMDomainVtd 0:2:0.0 3. Attach a PCI device to the guest by the physical BDF and desired virtual slot(optional). Following command would insert the physical device into guest's virtual slot 7 [root@vt-vtd ~]# xm pci-attach HVMDomainVtd 0:2:0.0 7 To specify options for the device, use -o or --options=. Following command would disable MSI-INTx translation for the device [root@vt-vtd ~]# xm pci-attach -o msitranslate=0 0:2:0.0 7 > Olaf _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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