[Bug 280098] 9pfs panics on qemu+kvm

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280098

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A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=814bf1fddd27aea69740f9e7426302354285cad4

commit 814bf1fddd27aea69740f9e7426302354285cad4
Author:     Danilo Egea Gondolfo <danilo@FreeBSD.org>
AuthorDate: 2024-07-06 16:51:51 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2024-07-07 11:39:27 +0000

    virtio_p9fs: fix panic on qemu/kvm

    When the module is loaded on a system running on qemu/kvm the "modern"
    virtio infrastructure is used and virtio_read_device_config() will end
    up calling vtpci_modern_read_dev_config(). This function cannot read
    values of arbitrary sizes and will panic if the p9fs mount tag size is
    not supported by it.

    Use virtio_read_device_config_array() instead. It was tested on both
    bhyve and qemu/kvm.

    PR: 280098
    Co-authored-by: Mark Peek <mp@FreeBSD.org>
    Reviewed by: imp
    Pull Request: https://github.com/freebsd/freebsd-src/pull/1320

 sys/dev/virtio/p9fs/virtio_p9fs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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