[Bug 268486] panic: vtd_add_device: device 0 is not in scope for any DMA remapping unit

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268486

--- Comment #7 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=53545967642d850eee4f2dd9fa27cae52ae981b9

commit 53545967642d850eee4f2dd9fa27cae52ae981b9
Author:     Eric Joyner <erj@FreeBSD.org>
AuthorDate: 2023-01-30 21:34:03 +0000
Commit:     Eric Joyner <erj@FreeBSD.org>
CommitDate: 2023-01-31 21:57:42 +0000

    vtd: Increase DRHD_MAX_UNITS

    Observed on a couple Ice Lake-SP platforms (Intel Coyote Pass, Dell
    R750), there are more than 8 DRHD sections enumerated in the DMAR ACPI
    section.  Since the previous limit was 8, this resulted in some of these
    not being parsed by vtd when the iommu is initialized; in this case when
    PCI devices are being passthru'd to a bhyve VM.

    This omission later causes a kernel panic later in initialization when
    devices could not be found in a valid DRHD scope because the DHRD
    containing the device's scope was not added to vtd.

    Signed-off-by: Eric Joyner <erj@FreeBSD.org>

    PR:             268486
    Sponsored by:   Intel Corporation
    Reviewed by:    rew@, corvink@
    MFC after:      1 day
    Differential Revision:  https://reviews.freebsd.org/D38285

 sys/amd64/vmm/intel/vtd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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