From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LRB6n-0000GS-UP for qemu-devel@nongnu.org; Sun, 25 Jan 2009 14:57:29 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LRB6l-0000GG-JM for qemu-devel@nongnu.org; Sun, 25 Jan 2009 14:57:28 -0500 Received: from [199.232.76.173] (port=48287 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LRB6l-0000GD-Cu for qemu-devel@nongnu.org; Sun, 25 Jan 2009 14:57:27 -0500 Received: from mail2.shareable.org ([80.68.89.115]:42101) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1LRB6l-0004J8-02 for qemu-devel@nongnu.org; Sun, 25 Jan 2009 14:57:27 -0500 Date: Sun, 25 Jan 2009 19:57:22 +0000 From: Jamie Lokier Subject: Re: [Qemu-devel] [6391] Fix nographic mode and VNC Message-ID: <20090125195722.GC4799@shareable.org> References: <200901220423.23551.paul@codesourcery.com> <497890ED.6000109@codemonkey.ws> <200901231820.32999.paul@codesourcery.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200901231820.32999.paul@codesourcery.com> Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Blue Swirl Paul Brook wrote: > Maybe. You risk having to put an SMP safe lock in the MMIO handler, which > would probably do bad things to performance. Would it? It's just one atomic operation in the non-contention case, and MMIO writes could be queued the same way that KVM queues them, without needing locks for each individual op. -- Jamie