From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christopher Covington Subject: Re: QEMU dies on any attempt to load a Linux kernel module when using a 9P rootfs Date: Tue, 26 Nov 2013 10:16:54 -0500 Message-ID: <5294BB66.3060608@codeaurora.org> References: <5293718E.4090508@gentoo.org> <5293C622.4070304@gentoo.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5293C622.4070304@gentoo.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Richard Yao Cc: kernel@gentoo.org, v9fs-developer@lists.sourceforge.net, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org List-Id: virtualization@lists.linuxfoundation.org Hi Richard, On 11/25/2013 04:50 PM, Richard Yao wrote: > I figured out the problem. There is zerocopy IO is being done via DMA to > a buffer allocated with valloc(). Right now, I am running a hack-fix > locally so I can get some other stuff done first. I will propose a > proper fix to the list in a few days. I've also encountered this issue on a non-QEMU simulator and have been carrying a disable-zero-copy hack for a few months. Let me know if there's anything I can help with. Christopher -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by the Linux Foundation.