linux-kernel - Re: [kvm-devel] [PATCH 01/15] KVM: Use a shared page for kernel/user communication when runing a vcpu

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Message-Id: <1173928163.4611.13.camel@diesel>
Date:	Wed, 14 Mar 2007 22:09:23 -0500
From:	Hollis Blanchard <hollis@...guinppc.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	kvm-devel@...ts.sourceforge.net, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH 01/15] KVM: Use a shared page for
	kernel/user communication when runing a vcpu

On Wed, 2007-03-14 at 21:38 -0500, Hollis Blanchard wrote:
> On Sun, 2007-03-11 at 15:53 +0200, Avi Kivity wrote:
> > Instead of passing a 'struct kvm_run' back and forth between the
> > kernel and userspace, allocate a page and allow the user to mmap() it.
> > This reduces needless copying and makes the interface expandable by
> > providing lots of free space.
> 
> Do you provide for another means of accessing guest memory from host
> userspace? For example, how do you attach a host debugger to the guest?
> 
> Xen uses an ioctl followed by mmap for this purpose, which is why I
> wonder about using mmap(/dev/kvm) for another purpose.

Never mind: I see now that you have separate device nodes for the VM vs
each vcpu.

-Hollis

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