linux-kernel - Re: [PATCH] scsi: virtio-scsi: Fix address translation failure of HighMem pages used by sg list

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Message-ID: <ccef753fa6fd0ce145611de514e75018@sf-mail.de>
Date:	Wed, 25 Jul 2012 12:04:33 +0200
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	Wang Sen <senwang@...ux.vnet.ibm.com>
Cc:	<linux-scsi@...r.kernel.org>, <jbottomley@...allels.com>,
	<pbonzini@...hat.com>, <stefanha@...ux.vnet.ibm.com>,
	<mc@...ux.vnet.ibm.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: virtio-scsi: Fix address translation failure of
 HighMem pages used by sg list

Am 25.07.2012 10:29, schrieb Wang Sen:
> When using the commands below to write some data to a virtio-scsi LUN 
> of the
> QEMU guest(32-bit) with 1G physical memory(qemu -m 1024), the qemu
> will crash.
>
> 	# sudo mkfs.ext4 /dev/sdb  (/dev/sdb is the virtio-scsi LUN.)
> 	# sudo mount /dev/sdb /mnt
> 	# dd if=/dev/zero of=/mnt/file bs=1M count=1024
>
> In current implementation, sg_set_buf is called to add buffers to sg
> list which
> is put into the virtqueue eventually.

The next sentence is somehow broken:

> But there are some HighMem pages in
> table->sgl can not get virtual address by sg_virt.

Maybe something like "But _if_ there are ... _you_ can not get ..."?

Eike
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