linux-kernel - Re: [RFC PATCH v2 03/19] vbus: add connection-client helper infrastructure

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Message-ID: <4A28111A.3080000@redhat.com>
Date:	Thu, 04 Jun 2009 21:23:22 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Gregory Haskins <ghaskins@...ell.com>,
	linux-kernel@...r.kernel.org, agraf@...e.de, pmullaney@...ell.com,
	pmorreale@...ell.com, anthony@...emonkey.ws, rusty@...tcorp.com.au,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	bhutchings@...arflare.com, andi@...stfloor.org, gregkh@...e.de,
	herber@...dor.apana.org.au, chrisw@...s-sol.org,
	shemminger@...tta.com
Subject: Re: [RFC PATCH v2 03/19] vbus: add connection-client helper	infrastructure

Michael S. Tsirkin wrote:
> Also - if we just had vmexit because a process executed
> io (or hypercall), can't we just do copy_to_user there?
> Avi, I think at some point you said that we can?
>   

You can do copy_to_user() whereever it is legal in Linux.  Almost all of 
kvm runs in process context, preemptible, and with interrupts enabled.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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