From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:55988) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SliBk-0008GF-Am for qemu-devel@nongnu.org; Mon, 02 Jul 2012 11:05:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SliBg-0000Ag-FA for qemu-devel@nongnu.org; Mon, 02 Jul 2012 11:05:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36723) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SliBg-00009r-79 for qemu-devel@nongnu.org; Mon, 02 Jul 2012 11:05:16 -0400 Message-ID: <4FF1B8A6.2020101@redhat.com> Date: Mon, 02 Jul 2012 18:05:10 +0300 From: Avi Kivity MIME-Version: 1.0 References: <4FEB2945.1030607@dlhnet.de> <4FEB3AC6.6010206@web.de> <4FEC1FC9.7050103@dlhnet.de> <4FEC2210.1030005@siemens.com> <4FEC2475.4030202@dlhnet.de> <4FEC2626.90402@dlhnet.de> In-Reply-To: <4FEC2626.90402@dlhnet.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] race between kvm-kmod-3.0 and kvm-kmod-3.3 // was: race condition in qemu-kvm-1.0.1 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Lieven Cc: Jan Kiszka , Gleb Natapov , qemu-devel@nongnu.org, kvm@vger.kernel.org On 06/28/2012 12:38 PM, Peter Lieven wrote: > does anyone know whats that here in handle_mmio? > > /* hack: Red Hat 7.1 generates these weird accesses. */ > if ((addr > 0xa0000-4 && addr <= 0xa0000) && kvm_run->mmio.len == 3) > return 0; > Just what it says. There is a 4-byte access to address 0x9ffff. The first byte lies in RAM, the next three bytes are in mmio. qemu is geared to power-of-two accesses even though x86 can generate accesses to any number of bytes between 1 and 8. It appears that this has happened with your guest. It's not impossible that it's genuine. -- error compiling committee.c: too many arguments to function