On Monday, January 7, 2019 6:55:48 PM CET James Prestwood wrote: > Hi, > > I am passing through PCI wireless adapters into a qemu VM and I am > seeing my host machine lock up/freeze when starting qemu if I try and > pass through an Atheros AR5B22 PCI card. After reboot I don't see > anything suspicious in /var/log/kern.log, although I don't really know > what to look for either (or maybe there is another log to look at?). I > have successfully done PCI passthrough with both an Intel 7260 and > 3160. Its whenever I add the Atheros card into the mix (or by itself) I > get this lockup when starting the VM. > > I have enabled the Ath9k drivers when building the kernel (same as with > Intel cards). This page I read online (https://wiki.debian.org/ath9k) > said the Ath9k cards don't require firmware like the Intel cards do, so > I have not added any firmware binaries for this card into the kernel > build. I also tried turning on the Ath9k debugging but saw no > additional prints in kern.log. > > With PCI passthrough there is some configuration required, like > substituting the drivers for the vfio-pci driver on the host machine, > so it could be completely unrelated to the Ath9k driver. Still, I was > hoping that someone more knowledgeable than me may know whats going on, > or at least where to look. The fact that the Intel cards work fine was > what made me think it could be a driver problem. > > I am more or less following this guide (except with wifi adapters > rather than GPU): > https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF > You could be a victim of: |/* | * Some Atheros AR9xxx and QCA988x chips do not behave after a bus reset. | * The device will throw a Link Down error on AER-capable systems and | * regardless of AER, config space of the device is never accessible again | * and typically causes the system to hang or reset when access is attempted. | * http://www.spinics.net/lists/linux-pci/msg34797.html | */ |DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0030, quirk_no_bus_reset); |DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0032, quirk_no_bus_reset); |DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x003c, quirk_no_bus_reset); |DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0033, quirk_no_bus_reset); <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/quirks.c#n3400> I know that the AR93xx and AR94xx cards have problems with PCIe Passthrough: <https://patchwork.kernel.org/patch/9141239/> and <https://www.spinics.net/lists/linux-pci/msg34797.html> so maybe you can get it to work, once you add a entry to the fixup list. Regards, Christian
