On Fri, 2014-01-10 at 08:23 -0800, Dana Goyette wrote: > I'm using the SuperMicro X10SAT, kernel 3.13-rc5, with ACS override on > Intel root ports. > > I'm trying to pass several devices to the same guest: > > 01:00.0 -- [1002:68be] Radeon HD 5750 > 01:00.1 -- [1002:aa58] HDMI Audio (not really needed) > 07:04.0 -- [13f6:8788] Xonar D1/DX sound card, behind PEX8112 > 09:00.0 -- [1912:0014] Renesas uPD720201 (USB 3.0) > > When trying to start qemu with various combinations of those devices: > vfio: Error: Failed to setup INTx fd: Device or resource busy > > Sound card conflicts with HDMI audio: > genirq: Flags mismatch irq 17. > 00000000 (vfio-intx(0000:07:04.0)) vs. > 00000000 (vfio-intx(0000:01:00.1)) > > USB controller conflicts with video card: > genirq: Flags mismatch irq 16. > 00000000 (vfio-intx(0000:09:00.0)) vs. > 00000000 (vfio-intx(0000:01:00.0)) > > On the ArchLinux forums, I was told that this means each device wants > the interrupt line to itself. > > Oddly, the host locks up if I launch Xorg with 'radeon' and > 'snd-virtuoso' both loaded. (Primary video is the Intel graphics.) > > These devices all work fine together using pci-assign, but pci-assign > requires ejecting the Radeon before VM shutdown. > > VFIO allows me to start the VM if I forward only the sound card and the > video card, but I really need the USB controller, as well. > > What can I do to forward those three devices via VFIO? Change slots until the interrupts don't conflict, maybe there's an IO-APIC option you can enable in the BIOS, or get devices that properly support PCI2.3 INTx disable. pci-assign tries to work around this by using MSI to emulate INTx, but I'm not convinced that this doesn't create more problems than it solves or I'd try to do the same with vfio. The Xorg problem might also suggest there's an existing interrupt routing problem on the system. It is surprising that you have so many devices that doesn't support INTx disable, can you try running this script on them: #!/bin/sh # Usage $0 <PCI device>, ex: 9:00.0 INTX=$(( 0x400 )) ORIG=$(( 0x$(setpci -s $1 4.w) )) if [ $(( $INTX & $ORIG )) -ne 0 ]; then echo "INTx disable supported and enabled on $1" exit 0 fi NEW=$(printf %04x $(( $INTX | $ORIG ))) setpci -s $1 4.w=$NEW NEW=$(( 0x$(setpci -s $1 4.w) )) if [ $(( $INTX & $NEW )) -ne 0 ]; then echo "INTx disable support available on $1" else echo "INTx disable support NOT available on $1" fi NEW=$(printf %04x $ORIG) setpci -s $1 4.w=$NEW -- 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
