netdev - Re: [PATCH 2/2] vDPA: conditionally read fields in virtio-net dev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <449c2fb2-3920-7bf9-8c5c-a68456dfea76@intel.com>
Date:   Wed, 17 Aug 2022 17:43:22 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Si-Wei Liu <si-wei.liu@...cle.com>, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, parav@...dia.com, xieyongji@...edance.com,
        gautam.dawar@....com
Subject: Re: [PATCH 2/2] vDPA: conditionally read fields in virtio-net dev



On 8/17/2022 5:39 PM, Michael S. Tsirkin wrote:
> On Wed, Aug 17, 2022 at 05:13:59PM +0800, Zhu, Lingshan wrote:
>>
>> On 8/17/2022 4:55 PM, Michael S. Tsirkin wrote:
>>> On Wed, Aug 17, 2022 at 10:14:26AM +0800, Zhu, Lingshan wrote:
>>>> Yes it is a little messy, and we can not check _F_VERSION_1 because of
>>>> transitional devices, so maybe this is the best we can do for now
>>> I think vhost generally needs an API to declare config space endian-ness
>>> to kernel. vdpa can reuse that too then.
>> Yes, I remember you have mentioned some IOCTL to set the endian-ness,
>> for vDPA, I think only the vendor driver knows the endian,
>> so we may need a new function vdpa_ops->get_endian().
>> In the last thread, we say maybe it's better to add a comment for now.
>> But if you think we should add a vdpa_ops->get_endian(), I can work
>> on it for sure!
>>
>> Thanks
>> Zhu Lingshan
> I think QEMU has to set endian-ness. No one else knows.
Yes, for SW based vhost it is true. But for HW vDPA, only
the device & driver knows the endian, I think we can not
"set" a hardware's endian.

So if you think we should add a vdpa_ops->get_endian(),
I will drop these comments in the next version of
series, and work on a new patch for get_endian().

Thanks,
Zhu Lingshan
>