[Bug 264267] UEFI Booting on Azure Generation 2 VMs crashes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264267

--- Comment #34 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=927358dd98cb902160093e0dc0bac002d6b43858

commit 927358dd98cb902160093e0dc0bac002d6b43858
Author:     Wei Hu <whu@FreeBSD.org>
AuthorDate: 2023-03-14 15:13:46 +0000
Commit:     Wei Hu <whu@FreeBSD.org>
CommitDate: 2023-03-18 07:07:35 +0000

    amd64 loader: Use efiserialio for Hyper-V booted systems

    UEFI provides ConIn/ConOut handles for consoles that it supports,
    which include the text-video and serial ports. When the serial port
    is available, use the UEFI driver instead of direct io-port accesses
    to avoid conflicts between the firmware and direct hardware access, as
    happens on Hyper-V (Azure) setups.

    This change enables efiserialio to be built for efi-amd64 and has
    higher order priority vs comconsole, and only uses efiserialio
    if the hypervisor is Hyper-V. When efiserialio successfully
    probes, it will set efi_comconsole_avail=true which will prevent
    comconsole from probing in this setup.

    Tested on Hyper-V, ESXi and Azure VMs.

    PR:             264267
    Reviewed by:    kevans, whu
    Tested by:      whu
    Obtained from:  Rubicon Communications, LLC (Netgate)
    MFC after:      2 weeks
    Sponsored by:   Rubicon Communications, LLC (Netgate)

 stand/efi/loader/arch/amd64/Makefile.inc |  1 +
 stand/efi/loader/bootinfo.c              | 11 ++++++--
 stand/efi/loader/conf.c                  |  6 +++++
 stand/efi/loader/efiserialio.c           | 43 ++++++++++++++++++++++++++++----
 stand/i386/libi386/comconsole.c          | 14 +++++++++++
 5 files changed, 68 insertions(+), 7 deletions(-)

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