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[Qemu-devel] qemu virtIO blocking operation - question

From: Sinha, Ani
Subject: [Qemu-devel] qemu virtIO blocking operation - question
Date: Fri, 9 Sep 2011 19:45:17 -0500

Hey guys,

So I am writing a virtIO driver for a device that supports blocking calls like 
poll() etc. Now the front end paravirtualized driver mirrors the request to the 
backend "host" qemu process that then does the actual call on the host kernel 
on behalf of the guest. Now my question is, when I do a blocking call from 
within the callback that I have registered when I created the virtqueue, does 
it block the entire vcpu? If it does, do I have to create an async context for 
it? Looking at virtio-net and virtio-block, I can see the concept of bottom 
halves but I am not sure if this helps me in any way.

Sorry guys, I am just starting to hack on QEMU, so some of my questions might 
be newbie-ish.

Any help, pointers will be much appreciated.


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