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

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Message-ID: <CAKviJvW5w_9_wMazs3HQigosuk+W-iQipb_0pZxr0-bu3xhGbg@mail.gmail.com>
Date:	Wed, 25 Jul 2012 19:46:18 +0800
From:	Sen Wang <kelvin.xupt@...il.com>
To:	Rolf Eike Beer <eike-kernel@...tec.de>
Cc:	Wang Sen <senwang@...ux.vnet.ibm.com>, 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

2012/7/25 Rolf Eike Beer <eike-kernel@...tec.de>:
> 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 ..."?

Thanks, I'll pay attention in next post.

>
> Eike
>
> --
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Wang Sen
Addr: XUPT,Xi'an,Shaanxi,China
Email: kelvin.xupt@...il.com
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