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[Qemu-devel] virtqueue corruption in emulation mode?

From: Sinha, Ani
Subject: [Qemu-devel] virtqueue corruption in emulation mode?
Date: Mon, 26 Sep 2011 19:16:56 -0500

Hi Guys :

I am using the virtqueue (virtqueue_pop, virtqueue_push etc) in the emulated 
mode (non-kvm mode) from an IO thread (a separate thread different from main 
QEMU thread). What I am observing is that the virtqueue memory seems to get 
corrupt. Either qemu crashes while performing virtqueue_push() 
(virtqueue_push() -> virtqueue_fill() 
->bring_used_idx()->lduw_phys()->qemu_get_ram_ptr()->"bad ram offset") or 
crashes when the guest accesses a bad memory while using virtqueue. Now this 
never ever happens when I run QEMU in KVM mode (/dev/kvm present) OR when I use 
my functions from within the main qemu thread. I am unable to figure out why 
this is happening. I have looked into my code over and over again and I can't 
seem to explain this behavior. Can any of you guys give me any inkling?

Thanks a lot in advance.

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