untrusted comment: verify with openbsd-72-base.pub
RWQTKNnK3CZZ8GFjc3FkCjpoAdHkiWBYaKDxXM2Cl0EBb1Pt8PKzdP2uaqO7c5mknYbWczMDqdRgk/WdDcqJ+tkfHbEcIhX6zQg=

OpenBSD 7.2 errata 010, December 14, 2022:

Fix booting vmd(8) guests from ramdisk with more than 4g of memory.

Apply by doing:
    signify -Vep /etc/signify/openbsd-72-base.pub -x 010_vmd.patch.sig \
        -m - | (cd /usr/src && patch -p0)

And then rebuild and install vmd:
    cd /usr/src/usr.sbin/vmd
    make obj
    make
    make install

Index: usr.sbin/vmd/loadfile_elf.c
===================================================================
RCS file: /cvs/src/usr.sbin/vmd/loadfile_elf.c,v
diff -u -p -r1.42 loadfile_elf.c
--- usr.sbin/vmd/loadfile_elf.c	28 Jan 2022 06:33:27 -0000	1.42
+++ usr.sbin/vmd/loadfile_elf.c	8 Dec 2022 16:33:08 -0000
@@ -401,6 +401,7 @@ push_bootargs(bios_memmap_t *memmap, siz
 	i = memmap_sz / sizeof(int);
 
 	/* Serial console device, COM1 @ 0x3f8 */
+	memset(&consdev, 0, sizeof(consdev));
 	consdev.consdev = makedev(8, 0);	/* com1 @ 0x3f8 */
 	consdev.conspeed = 115200;
 	consdev.consaddr = 0x3f8;