linux-kernel - Re: [PATCH 1/7] KVM: userspace interface

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Date:	Thu, 19 Oct 2006 21:36:40 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Anthony Liguori <aliguori@...ibm.com>
Cc:	John Stoffel <john@...ffel.org>, Avi Kivity <avi@...ranet.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] KVM: userspace interface

Ar Iau, 2006-10-19 am 13:49 -0500, ysgrifennodd Anthony Liguori:
> ioctls are probably wrong here though.  Ideally, you would want to be 
> able to support an SMP guest.  This means you need to have two virtual 
> processors executing in kernel space.  If you use ioctls, it forces you 

Not really and in fact with qemu you'd want to halt a trap on the second
virtual CPU until emulation was over if only to get I/O and other
instruction ordering right. Thats not an argument that only that view
should be supported of course.

> If you used a read/write interface, you could poll for any number of 
> processors and handle IO emulation in a single userspace thread (which 
> seems closer to how hardware really works anyway).

Agreed.

Alan

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