From: "Michael S. Tsirkin" <mst@redhat.com>
To: Zhang Tianci <zhangtianci.1997@bytedance.com>
Cc: jasowang@redhat.com, xuanzhuo@linux.alibaba.com,
eperezma@redhat.com, virtualization@lists.linux.dev,
xieyongji@bytedance.com
Subject: Re: virtio_pci: Question about virtio_pci kernel module refcnt
Date: Wed, 22 Oct 2025 07:31:29 -0400 [thread overview]
Message-ID: <20251022073015-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <CAP4dvsfZEo+1+O8tpLFFh=s-fEFaMRu2+mQ3F=LJmjoEHyZXMw@mail.gmail.com>
On Wed, Oct 22, 2025 at 07:21:45PM +0800, Zhang Tianci wrote:
> Hi,
> I noticed that the reference count of the virtio_pci kernel module
> in the VM is always 0, even though there are at least two
> virtio block devices and one virtiofs device in the VM.
>
> Using rmmod virtio_pci can unload the virtio_pci module,
> but this renders the virtio block devices unusable.
it removes them. you can put it back in and you will
get devices again.
> I wonder if this result is expected? Why don't the virtio block devices
> and virtiofs device hold a reference count to the virtio_pci kernel module?
because they don't have to.
--
MST
next prev parent reply other threads:[~2025-10-22 11:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-22 11:21 virtio_pci: Question about virtio_pci kernel module refcnt Zhang Tianci
2025-10-22 11:31 ` Michael S. Tsirkin [this message]
2025-10-23 2:34 ` [External] " Zhang Tianci
2025-10-24 1:53 ` Jason Wang
2025-10-24 2:34 ` Zhang Tianci
2025-10-24 4:00 ` Jason Wang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20251022073015-mutt-send-email-mst@kernel.org \
--to=mst@redhat.com \
--cc=eperezma@redhat.com \
--cc=jasowang@redhat.com \
--cc=virtualization@lists.linux.dev \
--cc=xieyongji@bytedance.com \
--cc=xuanzhuo@linux.alibaba.com \
--cc=zhangtianci.1997@bytedance.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.