From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sander Eikelenboom Subject: Re: xl pci-attach silently fails the first time Date: Mon, 1 Dec 2014 14:57:02 +0100 Message-ID: <1299044479.20141201145702@eikelenboom.it> References: <20141201125712.GA21576@aepfle.de> <20141201133244.GA24600@aepfle.de> <20141201134211.GA25822@aepfle.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20141201134211.GA25822@aepfle.de> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Olaf Hering Cc: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org 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