> > i`ve got a question about pci passthrogh of 2 pci devices (2x DVB-S2 > > PCI cards with Saa7146 PCI Bridge from Technotrend: S2-3200). > > > > I am using squeeze with a 2.6.37 selfcompiled Kernel. I want to > > passthrough both devices to a virtual machine (Win7) an get problems. > > If i passthrough one device (other is unplugged) it works flawlessly. > > I'm glad to hear it works one at a time. It's oddly specific that you > mention it works if the other card is unplugged, can you only physically > have one card plugged in at a time for it to work (ie. if you have both > cards physically installed, but only one assigned to the guest, does it > work)? Can you simultaneously assign each card to separate guests and > they work? I tried both devices, one at a time. Both are working well. KVM supports the passthrough with all devices together behind a bridge only. So i have to pass all 03.0x.y devices through to one guest only. > > The time i add both devices and pass them through i am still able to > > start the VM and i don`t see anything in the error logs. Even Windows7 > > or XP detects both cards and installs the driver correctly (actual BDA > > Driver, standard broadcast video driver). But the time i want to acces > > the cards, i get a BSOD - caused by the driver. > > I'll toss out a dumb question, can the drivers for Win7 or WinXP drive > two cards when running on bare metal? Does a Linux guest work with both > cards better? The driver support more than one devices. I already contacted the support and they assured me, that the driver i used is working. Using both cards in Linux won`t help, because i want to use them with a windows application. > > I already aligned the io memory of both devices, checked the libvirt > > logs, kernel and syslogs - there is nothing for a kvm newbe that seems > > to be odd. The kernel is compiled with all the mentioned kernel > > options of the linux-kvm.org page - except that i compiled the stub > > driver as module. One card alone (both tried separately) is working > > w/o any flaws. Kvm is able to pass through all devices behind a PCI > > Bridge - so take a look at the 03:0x.0 devices below: i use those 2 > > sat boards only in 3 PCI slots. > > > > What am i able to do to make deeper analysis or to solve the > > problem ? > > If each card works when assigned separately and you can boot the guest > with both cards assign and the drivers load and device manager isn't > reporting any errors, I'd lean towards a Windows driver issue. There is > some debugging you can enable in hw/device-assignment.c that might shed > some light on what the drivers is trying to do before the BSOD. What > error is the BSOD reporting? Are you using the latest qemu-kvm.git? The drivers work on 'bare metal' as you mentioned above. I won`t believe that its a pure driver-only issue for now. But the other behavior of the passed through device may cause the driver fault. The BSOD tells, that it is a general driver issue which caused the fault. I am using the kvm codse which is distributed in the kernel 2.6.37 and standard debian squeeze repositories for installation of the tools lib-virt, etc... I am trying to get some more PCI spcecific data from the windows guests. I will try to use both cards in a linux vm. > Thanks, > > Alex Thanks for participating in my very special problem, DP -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
