What were you trying to do that didn't work?
[root@nvidia-grace-hopper-04 ~]# /usr/libexec/qemu-kvm -cpu 'host' -object '{"size": 4294967296, "prealloc": false, "share": false, "merge": false, "dump": false, "id": "mem-memN0", "qom-type": "memory-backend-ram"}'
qemu-kvm: ../system/memory.c:2419: void *memory_region_get_ram_ptr(MemoryRegion *): Assertion `mr->ram_block' failed.
Aborted (core dumped)

Please provide the package NVR for which the bug is seen:
Host Distro:     RHEL-9.6.0-20241116.2
Host Kernel:  5.14.0-529.el9.aarch64+64k
QEMU:  qemu-kvm-9.1.0-2.el9
edk2:  edk2-aarch64-20240524-9.el9.noarch

How reproducible is this bug?:
With -object '{"size": 4294967296, "prealloc": false, "share": false, "merge": false, "dump": false, "id": "mem-memN0", "qom-type": "memory-backend-ram"}' boot

Steps to reproduce
100%

Other

qemu-kvm-9.0.0-9.el9 -----> can boot normally

qemu-kvm-9.1.0-1.el9 -----> hit this issue too