linux-kernel - Re: [PATCH] virtio-console: avoid DMA from vmalloc area

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Date:   Wed, 28 Jul 2021 17:10:35 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Amit Shah <amit@...nel.org>, gregkh <gregkh@...uxfoundation.org>,
        Omar Sandoval <osandov@...com>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@...ts.linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] virtio-console: avoid DMA from vmalloc area


在 2021/7/28 下午5:01, Arnd Bergmann 写道:
> On Wed, Jul 28, 2021 at 10:28 AM Xianting Tian
> <xianting.tian@...ux.alibaba.com> wrote:
>> 在 2021/7/28 下午3:25, Arnd Bergmann 写道:
>>
>> I checked several hvc backends, like drivers/tty/hvc/hvc_riscv_sbi.c,
>> drivers/tty/hvc/hvc_iucv.c, drivers/tty/hvc/hvc_rtas.c, they don't use dma.
>>
>> I not finished all hvc backends check yet. But I think even if all hvc
>> backends don't use dma currently, it is still possible that the hvc
>> backend using dma will be added in the furture.
>>
>> So I agree with you it should better be fixed in the hvc framework,
>> solve the issue in the first place.
> Ok, sounds good to me, no need to check more backends then.
> I see the hvc-console driver is listed as 'Odd Fixes' in the maintainer
> list, with nobody assigned other than the ppc kernel list (added to Cc).
>
> Once you come up with a fix in hvc_console.c, please send that to the
> tty maintainers, the ppc list and me, and I'll review it.
OK, thanks, I will submit the patch ASAP :)
>
>          Arnd