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Re: [Qemu-devel] [Bug 818673] Re: virtio: trying to map MMIO memory

From: Rick Vernam
Subject: Re: [Qemu-devel] [Bug 818673] Re: virtio: trying to map MMIO memory
Date: Wed, 14 Sep 2011 21:30:11 -0000

On Wednesday 14 September 2011 14:42:09 vrozenfe wrote:
> Thank you, Rick.
> Could you help me to narrow this problem down?

> As I see, you have three virtio drivers installed on your system - block,
> net, and virtio serial. Technically, anyone of them can create "trying to
> map MMIO memory" problem. The best way to find a buggy driver ( or
> drivers) will be to isolate one from the other. If you can, please try
> running only one virtio device every time to see which driver sends
> incorrect  scatter/gather list element to QEMU.
Sure, no problem.  I'll have that in the next few days.

> Another question. You said, the problem happens after every second or third
> restart. Do you shutdown your VM,  or just restart it?
Have to shut down the VM guest so that the qemu process exits.

> How does it work
> after going through several hibernate/resume, and/or suspend/resume
> cycles.
I often will suspend with or without pausing qemu (via monitor commands 'stop' 
and 'cont').  I have never experienced any problem with the qemu process that 
was running prior to the suspend.

> Best regards,
> Vadim.


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  virtio: trying to map MMIO memory

Status in QEMU:

Bug description:
  Qemu host is Core i7, running Linux.  Guest is Windows XP sp3.
  Often, qemu will crash shortly after starting (1-5 minutes) with a statement 
"qemu-system-x86_64: virtio: trying to map MMIO memory"
  This has occured with qemu-kvm 0.14, qemu-kvm 0.14.1, qemu-0.15.0-rc0 and 
qemu 0.15.0-rc1.
  Qemu is started as such:
  qemu-system-x86_64 -cpu host -enable-kvm -pidfile /home/rick/qemu/hds/wxp.pid 
-drive file=/home/rick/qemu/hds/wxp.raw,if=virtio -m 768 -name WinXP -net 
nic,model=virtio -net user -localtime -usb -vga qxl -device virtio-serial 
-chardev spicevmc,name=vdagent,id=vdagent -device 
virtserialport,chardev=vdagent,name=com.redhat.spice.0 -spice 
port=1234,disable-ticketing -daemonize -monitor 
  The WXP guest has virtio 1.1.16 drivers for net and scsi, and the most 
current spice binaries from spice-space.org.

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