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git2svn
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V 27
2023-02-06T22:53:18.748922Z
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V 881
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@
Differential Revision:	https://reviews.freebsd.org/D38285

(cherry picked from commit 53545967642d850eee4f2dd9fa27cae52ae981b9)

Git Hash:   b4e0be6df772a3bd5f235e2a840ff4fdbe57e2d1
Git Author: erj@FreeBSD.org
END