From: Richard Weinberger <richard@nod.at>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Hajime Tazaki <thehajime@gmail.com>,
linux-arch <linux-arch@vger.kernel.org>, cem <cem@freebsd.org>,
tavi purdila <tavi.purdila@gmail.com>,
linux-um <linux-um@lists.infradead.org>,
retrage01 <retrage01@gmail.com>,
linux-kernel-library@freelists.org,
pscollins <pscollins@google.com>,
sigmaepsilon92 <sigmaepsilon92@gmail.com>,
liuyuan <liuyuan@google.com>
Subject: Re: [RFC v2 17/37] lkl tools: host lib: virtio devices
Date: Tue, 26 Nov 2019 09:50:25 +0100 (CET) [thread overview]
Message-ID: <1662825264.98055.1574758225905.JavaMail.zimbra@nod.at> (raw)
In-Reply-To: <de90b04151bafee083727c9769833932788cf428.camel@sipsolutions.net>
----- Ursprüngliche Mail -----
> Von: "Johannes Berg" <johannes@sipsolutions.net>
> An: "Richard Weinberger" <richard.weinberger@gmail.com>, "Hajime Tazaki" <thehajime@gmail.com>
> CC: "linux-arch" <linux-arch@vger.kernel.org>, "cem" <cem@freebsd.org>, "tavi purdila" <tavi.purdila@gmail.com>,
> "linux-um" <linux-um@lists.infradead.org>, "retrage01" <retrage01@gmail.com>, linux-kernel-library@freelists.org,
> "pscollins" <pscollins@google.com>, "sigmaepsilon92" <sigmaepsilon92@gmail.com>, "liuyuan" <liuyuan@google.com>
> Gesendet: Dienstag, 26. November 2019 09:43:36
> Betreff: Re: [RFC v2 17/37] lkl tools: host lib: virtio devices
> On Mon, 2019-11-25 at 23:07 +0100, Richard Weinberger wrote:
>> On Fri, Nov 8, 2019 at 6:03 AM Hajime Tazaki <thehajime@gmail.com> wrote:
>> > From: Octavian Purdila <tavi.purdila@gmail.com>
>> >
>> > Add helpers for implementing host virtio devices. It uses the memory
>> > mapped I/O helpers to interact with the Linux MMIO virtio transport
>> > driver and offers support to setup and add a new virtio device,
>> > dispatch requests from the incoming queues as well as support for
>> > completing requests.
>> >
>> > All added virtio devices are stored in lkl_virtio_devs as strings, per
>> > the Linux MMIO virtio transport driver command line specification.
>>
>> Did you checkout arch/um/drivers/virtio_uml.c?
>> Why is this driver needed?
>
> This isn't really a driver, this is virtio *device-side* code. Our
> virtio_uml is *guest-side* code, and only speaks vhost-user.
Sorry, bad wording from my side. I meant with "driver" a kernel component.
> I'm not sure how MMIO devices could possibly work though, does LKL
> intercept MMIO somehow?
My point is that UML and LKL should try to do use the same concept/code
regarding virtio. At the end of day both use virtual devices which use
facilities from the host.
If this is really not possible it needs a good explanation.
Thanks,
//richard
next prev parent reply other threads:[~2019-11-26 8:50 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1571798507.git.thehajime@gmail.com>
2019-10-25 21:34 ` [RFC PATCH 00/47] Unifying LKL into UML Richard Weinberger
2019-10-27 2:34 ` Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 00/37] " Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 01/37] asm-generic: atomic64: allow using generic atomic64 on 64bit platforms Hajime Tazaki
2019-11-25 22:02 ` Richard Weinberger
2019-11-26 14:02 ` Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 02/37] arch: add __SYSCALL_DEFINE_ARCH Hajime Tazaki
2019-11-25 22:02 ` Richard Weinberger
2019-11-27 4:15 ` Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 03/37] lkl: architecture skeleton for Linux kernel library Hajime Tazaki
2019-11-25 22:00 ` Richard Weinberger
2019-11-26 11:42 ` Octavian Purdila
2019-11-26 14:17 ` Hajime Tazaki
2019-11-26 16:02 ` Richard Weinberger
2020-02-05 7:37 ` Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 04/37] lkl: host interface Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 05/37] lkl: memory handling Hajime Tazaki
2019-11-25 22:10 ` Richard Weinberger
2020-02-05 7:38 ` Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 06/37] lkl: kernel threads support Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 07/37] lkl: interrupt support Hajime Tazaki
2019-11-25 22:13 ` Richard Weinberger
2020-02-05 7:38 ` Hajime Tazaki
2020-02-05 10:49 ` Anton Ivanov
2020-02-05 14:24 ` Hajime Tazaki
2020-02-18 8:18 ` Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 08/37] lkl: system call interface and application API Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 09/37] lkl: timers, time and delay support Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 10/37] lkl: memory mapped I/O support Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 11/37] lkl: basic kernel console support Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 12/37] lkl: initialization and cleanup Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 13/37] lkl: plug in the build system Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 14/37] lkl tools: skeleton for host side library, tests and tools Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 15/37] lkl tools: host lib: add utilities functions Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 16/37] lkl tools: host lib: memory mapped I/O helpers Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 17/37] lkl tools: host lib: virtio devices Hajime Tazaki
2019-11-25 22:07 ` Richard Weinberger
2019-11-26 8:43 ` Johannes Berg
2019-11-26 8:50 ` Richard Weinberger [this message]
2019-11-26 8:52 ` Johannes Berg
2019-11-26 10:09 ` Richard Weinberger
2019-11-26 10:16 ` Johannes Berg
2019-11-26 10:42 ` Octavian Purdila
2019-11-26 10:49 ` Anton Ivanov
2019-11-27 4:06 ` Hajime Tazaki
2019-11-26 16:04 ` Richard Weinberger
2019-11-27 4:08 ` Hajime Tazaki
2019-11-27 14:28 ` Richard Weinberger
2019-11-28 9:53 ` Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 18/37] lkl tools: host lib: virtio block device Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 19/37] lkl tools: host lib: filesystem helpers Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 20/37] lkl tools: host lib: posix host operations Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 21/37] lkl tools: "boot" test Hajime Tazaki
2020-01-23 19:33 ` Brendan Higgins
2020-01-24 4:32 ` Hajime Tazaki
2020-03-02 19:51 ` Luis Chamberlain
2020-03-02 22:25 ` Brendan Higgins
2019-11-08 5:02 ` [RFC v2 22/37] lkl tools: tool that reads/writes to/from a filesystem image Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 23/37] lkl tools: tool that converts a filesystem image to tar Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 24/37] lkl tools: virtio: add network device support Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 25/37] checkpatch: avoid showing BIT_ULL warnings for tools/ files Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 26/37] tools: Add the lkl host library to the common tools Makefile Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 27/37] lkl tools: add lklfuse Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 28/37] lkl: add system call hijack support Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 29/37] lkl: add documentation Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 30/37] scripts: revert CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX patches Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 31/37] lkl: add support for Windows hosts Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 32/37] lkl tools: add support for Windows host Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 33/37] kallsyms: Add a config option to select section for kallsyms Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 34/37] lkl: Android ARM (arm/arm64) support Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 35/37] um lkl: add CI tests Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 36/37] um: use lkl virtio_net_tap device as UML device Hajime Tazaki
2019-11-08 5:02 ` [RFC v2 37/37] um: add lkl virtio-blk device Hajime Tazaki
2019-11-08 9:13 ` [RFC v2 00/37] Unifying LKL into UML Anton Ivanov
2019-11-08 11:17 ` Octavian Purdila
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