From: Keir Fraser <keir@xen.org>
To: Olaf Hering <olaf@aepfle.de>, xen-devel@lists.xensource.com
Subject: Re: Re: how to handle paged hypercall args?
Date: Thu, 11 Nov 2010 20:08:59 +0000 [thread overview]
Message-ID: <C901FDDB.999A%keir@xen.org> (raw)
In-Reply-To: <20101111143338.GA27721@aepfle.de>
On 11/11/2010 14:33, "Olaf Hering" <olaf@aepfle.de> wrote:
> So is that an acceptable way to deal with the HVMCOPY_gfn_paged_out
> return codes from __hvm_copy?
> Or should I explore some different way, like spinning there and possible
> let other threads-of-execution make progress while waiting for the gfns
> to come back?
You can't just spin because Xen is not preemptible. If it were a single CPU
system for example, no other thread would ever run again. You have to 'spin'
via a preemptible loop that returns to guest context and then back into the
hypercall. Which appears to be what you're doing.
-- Keir
next prev parent reply other threads:[~2010-11-11 20:08 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-10 8:58 how to handle paged hypercall args? Olaf Hering
2010-11-11 14:33 ` Olaf Hering
2010-11-11 20:08 ` Keir Fraser [this message]
2010-11-11 20:34 ` Olaf Hering
2010-11-11 21:00 ` Keir Fraser
2010-11-12 9:45 ` Jan Beulich
2010-11-12 10:22 ` Keir Fraser
2010-11-12 10:47 ` Jan Beulich
2010-11-12 14:32 ` Keir Fraser
2010-11-15 13:12 ` Olaf Hering
2010-11-17 16:52 ` Keir Fraser
2010-11-18 12:33 ` Keir Fraser
2010-11-18 13:51 ` Olaf Hering
2010-12-02 10:11 ` Olaf Hering
2010-12-02 10:22 ` Keir Fraser
2010-12-02 10:30 ` Keir Fraser
2010-12-03 9:14 ` Olaf Hering
2010-12-03 14:37 ` Keir Fraser
2010-12-02 10:25 ` Jan Beulich
2010-12-03 9:06 ` Olaf Hering
2010-12-03 14:18 ` Keir Fraser
2010-12-02 10:18 ` Olaf Hering
2010-12-02 10:25 ` Keir Fraser
2010-12-07 9:25 ` Olaf Hering
2010-12-07 16:45 ` Keir Fraser
2010-12-07 17:16 ` Olaf Hering
2010-12-07 18:08 ` Keir Fraser
2010-12-07 18:50 ` Olaf Hering
2010-11-15 9:37 ` Tim Deegan
2010-11-15 9:53 ` Jan Beulich
2010-11-15 10:09 ` Keir Fraser
2010-11-15 10:20 ` Tim Deegan
2010-11-15 10:33 ` Keir Fraser
2010-11-15 10:49 ` Tim Deegan
2010-11-15 11:55 ` Keir Fraser
2010-11-15 12:04 ` Tim Deegan
2010-11-15 12:17 ` Keir Fraser
2010-12-03 9:03 ` Olaf Hering
2010-12-03 14:13 ` Keir Fraser
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