Comment 2 for bug 1488363

Hi,

proxmox users report same bug here with qemu 2.4:

http://forum.proxmox.com/threads/23346-Proxmox-4b1-q35-machines-failing-to-reboot-problems-with-PCI-passthrough

we are going to test with reverting the commit to see if it's help.

----- Mail original -----
De: "Peter Maloney" <email address hidden>
À: "qemu-devel" <email address hidden>
Envoyé: Mercredi 26 Août 2015 21:48:16
Objet: [Qemu-devel] [Bug 1488363] Re: qemu 2.4.0 hangs using vfio for pci passthrough of graphics card

I ran a bisect, and here's the result:

b8eb5512fd8a115f164edbbe897cdf8884920ccb is the first bad commit
commit b8eb5512fd8a115f164edbbe897cdf8884920ccb
Author: Nadav Amit <email address hidden>
Date: Mon Apr 13 02:32:08 2015 +0300

target-i386: disable LINT0 after reset

Due to old Seabios bug, QEMU reenable LINT0 after reset. This bug is long gone
and therefore this hack is no longer needed. Since it violates the
specifications, it is removed.

Signed-off-by: Nadav Amit <email address hidden>
Message-Id: <email address hidden>
Signed-off-by: Paolo Bonzini <email address hidden>

:040000 040000 a8ec76841b8d4e837c2cd0d0b82e08c0717a0ec6
d33744231c98c9f588cefbc92f416183f639706f M hw

$ git diff 7398dfc7799a50097803db4796c7edb6cd7d47a1 b8eb5512fd8a115f164edbbe897cdf8884920ccb

diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index 042e960..d38d24b 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -243,15 +243,6 @@ static void apic_reset_common(DeviceState *dev)
info->vapic_base_update(s);

apic_init_reset(dev);
-
- if (bsp) {
- /*
- * LINT0 delivery mode on CPU #0 is set to ExtInt at initialization
- * time typically by BIOS, so PIC interrupt can be delivered to the
- * processor when local APIC is enabled.
- */
- s->lvt[APIC_LVT_LINT0] = 0x700;
- }
}

/* This function is only used for old state version 1 and 2 */

And then to confirm it:

git checkout v2.4.0
git revert b8eb5512fd8a115f164edbbe897cdf8884920ccb

And this build works. :)

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https://bugs.launchpad.net/bugs/1488363

Title:
qemu 2.4.0 hangs using vfio for pci passthrough of graphics card

Status in QEMU:
New

Bug description:
2.3.0 (manjaro distro package) works fine. 2.4.0 (manjaro or the arch
vanilla one) hangs on the SeaBIOS screen when saying "Press F12 for
boot menu". All tested with the same hardware, OS, command and
configuration. It also starts without the GPU passed through, even
with the USB passed through. I am using the latest SeaBIOS 1.8.2.

The release notes say:
VFIO
Support for resetting AMD Bonaire and Hawaii GPUs
Platform device passthrough support for Calxeda xgmac devices

So maybe something there broke it.

I am using the arch qemu 2.4.0 PKGBUILD (modified to have make -j8 and removed iscsi, gluster, ceph, etc.), which uses vanilla sources and no patches. https://projects.archlinux.org/svntogit/packages.git/tree/trunk?h=packages/qemu

I am not using a frontend. I am using a script I wrote that generates
the command below.

Guest OS here would be 64 bit windows 7, but it didn't start so that's
not relevant. Also a Manjaro Linux VM won't start.

CPU is AMD FX-8150; board is Gigabyte GA-990FXA-UD5 (990FX chipset).

full command line (without the \ after each line) is:

qemu-system-x86_64
-enable-kvm
-M q35
-m 3584
-cpu host
-boot c
-smp 7,sockets=1,cores=7,threads=1
-vga none
-device ioh3420,bus=pcie.0,addr=1c.0,port=1,chassis=1,id=root.1
-device vfio-pci,host=04:00.0,bus=root.1,multifunction=on,x-vga=on,addr=0.0,romfile=Sapphire.R7260X.1024.131106.rom
-device vfio-pci,host=00:14.2,bus=pcie.0
-device vfio-pci,host=00:16.0,bus=root.1
-device vfio-pci,host=00:16.2,bus=root.1
-usb
-device ahci,bus=pcie.0,id=ahci
-drive file=/dev/data/vm1,id=disk1,format=raw,if=virtio,index=0,media=disk,discard=on
-drive media=cdrom,id=cdrom,index=5,media=cdrom
-netdev type=tap,id=net0,ifname=tap-vm1
-device virtio-net-pci,netdev=net0,mac=00:01:02:03:04:05
-monitor stdio
-boot menu=on

$ lspci -nn | grep -E "04:00.0|00:14.2|00:16.0|00:16.2"
00:14.2 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA) [1002:4383] (rev 40)
00:16.0 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller [1002:4397]
00:16.2 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller [1002:4396]
04:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Bonaire XTX [Radeon R7 260X] [1002:6658]

Also I have this one that also hangs:
05:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Juniper XT [Radeon HD 6770] [1002:68ba]

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