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[Qemu-devel] question about qemu IO process


From: ousuju
Subject: [Qemu-devel] question about qemu IO process
Date: Thu, 15 Dec 2016 14:50:41 +0800

Hello, I'm a newbie of Qemu. sorry about my stupid question.

I recently try to figure out the the whole IO process in qemu, I have traced 
most parts of this process, but I'm still confused about how guest OS notify 
qemu to handle virtqueue
I traced to virtio_queue_host_notifier_read -> event_notifier_test_and_clear, 
and qemu will read e->rfd, so I assumed that some part of code will write to 
this descriptor, to notify qemu
Unfortunatelly, I have set some breakpoints but noting catched yet.
Could someone point it out for me which code write to this descriptor? Or show 
me the web link about this design?

Thanks a lot!
sou

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