[Bug 290098] bhyve crashes when trying to boot or run a 9front VM and other OSes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290098

Chris Mecca <cm@chrismecca.com> changed:

           What    |Removed                     |Added
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                 CC|                            |cm@chrismecca.com

--- Comment #24 from Chris Mecca <cm@chrismecca.com> ---
Confirmed working on FreeBSD 15.0-RELEASE-p5 (amd64) with the 
patch attributed to Mark Peek reducing FB_SIZE from 32MB to 16MB
in usr.sbin/bhyve/pci_fbuf.c.

Tested with 9front-11498.c89461d55aa4.amd64 under bhyve with UEFI
(edk2-bhyve) on an Intel Xeon E3 host (Hetzner EX44).

Without patch: Assertion failed: (error == 0), function 
modify_bar_registration, file pci_emul.c, line 706. Abort trap.

With patch: 9front boots successfully, VNC framebuffer works at
800x600, drawterm connects via cpu server.

Patch:
--- a/usr.sbin/bhyve/pci_fbuf.c
+++ b/usr.sbin/bhyve/pci_fbuf.c
-#define FB_SIZE    (32*MB)
+#define FB_SIZE    (16*MB)
-#define COLS_MAX   3840
-#define ROWS_MAX   2160
+#define COLS_MAX   1920
+#define ROWS_MAX   1200

The 32MB framebuffer window conflicts with available PCI address space 
on certain hardware configurations. 16MB works great for 9front specifically.

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