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Re: [Qemu-devel] [PATCH 0/4] net-bridge: rootless bridge support for qem

From: Jamie Lokier
Subject: Re: [Qemu-devel] [PATCH 0/4] net-bridge: rootless bridge support for qemu
Date: Sat, 7 Nov 2009 10:44:02 +0000
User-agent: Mutt/1.5.13 (2006-08-11)

Avi Kivity wrote:
> So vfork() is required, or in light of its man page and glowing 
> recommendations from the security people,

vfork() on Linux is fine to use, as long as you respect it's unwritten
requirements :-)

In a multithreaded program: you can start by spawning a thread for the
sole purpose of spawning a process.  Call vfork() from the new thread.
Then a slow exec() call won't delay the rest of the program, because
it's only blocking the thread you created.

> we can mark guest memory as 
> shared on fork and use plain fork(), like we do for pre mmu notifier 
> kernels.

Aiee - what's the plan?  Can a running KVM be forked, as in into two
separate processes to run the forked guests in parallel, or not?

-- Jamie

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