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Bug 1967958 - dracut: Add support for virtiofs as root filesystem
Summary: dracut: Add support for virtiofs as root filesystem
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: dracut
Version: 9.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: beta
: ---
Assignee: Pavel Valena
QA Contact: qe-baseos-daemons
URL:
Whiteboard:
: 2076212 (view as bug list)
Depends On: 2066816 2085347
Blocks: 2054152
TreeView+ depends on / blocked
 
Reported: 2021-06-04 14:25 UTC by Vivek Goyal
Modified: 2022-08-17 14:20 UTC (History)
11 users (show)

Fixed In Version: dracut-057-13.git20220816.el9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-08-17 14:20:00 UTC
Type: Bug
Target Upstream Version:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Github dracutdevs dracut pull 1784 0 None Merged feat(virtiofs): virtiofs root filesystem support 2022-05-06 10:34:44 UTC

Description Vivek Goyal 2021-06-04 14:25:20 UTC 
Description of problem:

dracut currently can't deal with mounting virtiofs as root filesystem. Add support for virtiofs in dracut. People are trying to use virtiofs as rootfs
and complaining.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
Comment 1 David Tardon 2021-06-08 11:21:29 UTC 
I assume you have the set up to test this easily, so: does it work if you add qemu module into initrd? If not, does it work if you add qemu module and virtiofs driver?
Comment 2 Vivek Goyal 2021-06-08 15:52:21 UTC 
(In reply to David Tardon from comment #1)
> I assume you have the set up to test this easily, so: does it work if you
> add qemu module into initrd? If not, does it work if you add qemu module and
> virtiofs driver?

I don't have a working setup yet. Frankly speaking, my initrd will not mount it and drop me to emergency shell. There I will mount it manually "mount -t virtiofs myfs /sysroot" and then continue booting.

I think one problem is that how rootfs device should be specified for virtiofs filessytem. There does not seem to be a good way and different kind of hacks are being used. I have proposed one patch upstream
just now.

https://lore.kernel.org/linux-fsdevel/20210608153524.GB504497@redhat.com/

If this gets accepted then we can specify "root=fstag:myfs rootfstype=virtiofs" on kernel command line. I am assuming that some dracut module can parse this and mount virtiofs. Not sure if we will need a separate
virtiofs module for this or some existing module can take care this.

I have not played with "qemu" module. Can give it a try. What is it supposed to do? I mean what kind of filesystems it can mount.
Comment 3 Vivek Goyal 2021-06-08 20:16:31 UTC 
I see that we have a module 95virtfs/ which seems to have support for 9p/virtfs. I think we will need something similar for virtiofs.

What I am not sure is that does dracut relies on same syntax for "root=" option for kernel and dracut. Or dracut has moved on and has its own
way to parse root= option irrespective of kernel.

If dracut parses "root=virtiofs:myfs", then problem becomes little easier. Or may be we can modify it to parse "root=fstag:myfs rootfstype=virtiofs" combo so that it is inline with kernel parsing. Assuming kernel,
will accept my proposal.
Comment 4 David Tardon 2022-04-19 10:05:10 UTC 
*** Bug 2076212 has been marked as a duplicate of this bug. ***
Comment 5 German Maglione 2022-04-20 16:38:25 UTC 
I have sent a PR to add virtiofs as a dracut module.
https://github.com/dracutdevs/dracut/pull/1784
Comment 10 Pavel Valena 2022-07-13 21:52:16 UTC 
Hello, please test, if you can, whether the planned rebase for 9.1 works for you.

RPMS: https://github.com/pvalena/rpms/tree/main/dracut/2066816
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