Using more than 2G of RAM on armv7l guest with RPI4
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## Host environment
- Operating system: NixOS unstable
- OS/kernel version: `Linux 5.15.16-lqx2 #1-NixOS ZEN SMP Tue Jan 1 00:00:00 UTC 1980 aarch64 GNU/Linux`
- Architecture: `aarch64`
- QEMU flavor: `qemu-system-aarch64`
- QEMU version: 7.0.0
- QEMU command line:
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command line arguments in /var/log/libvirt/qemu/$GUEST.log.
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```
qemu-kvm \
-kernel /nix/store/hr7ysnds8v7wvgc35r7xf96py4d10xj8-linux-armv7l-unknown-linux-gnueabihf-5.10.89/zImage \
-initrd /nix/store/rymjzx2jcxkajc288hr5128klz12gm97-initrd-linux-armv7l-unknown-linux-gnueabihf-5.10.89/initrd \
-append "init=/nix/store/7m7gch986brhp9a01p3rds5i2nqcbl04-nixos-system-kasumi-22.05.20220107.ff377a7/init boot.shell_on_fail console=ttyAMA0,115200 loglevel=4 closureInfo=n1w1mycb2rpbbfk6qizy1awd7sm1zk6h-closure-info-armv7l-unknown-linux-gnueabihf" \
-M virt,highmem=off,gic-version=host,accel=kvm \
-cpu host,aarch64=off \
-smp 4 \
-m 6G \
-nographic \
-object iothread,id=iothread0 \
-device virtio-rng-pci \
-device virtio-scsi-pci,iothread=iothread0,id=scsi0 \
-device scsi-hd,drive=hd0,bus=scsi0.0,serial=scratch \
-drive if=none,id=hd0,file=$TMPDIR/scratch.raw,format=raw,discard=unmap,werror=report,cache.direct=on,cache=unsafe,aio=native \
-fsdev local,id=state,path=$STATEDIR,security_model=none \
-device virtio-9p-pci,fsdev=state,mount_tag=state \
-fsdev local,id=host-store,path=/nix/store,security_model=none,readonly=on \
-device virtio-9p-pci,fsdev=host-store,mount_tag=host-store \
-net nic,netdev=user.0,model=virtio \
-netdev user,id=user.0,hostfwd=tcp:0.0.0.0:2200-:22 \
-chardev stdio,mux=on,id=char0 \
-mon chardev=char0,mode=readline \
-serial "$serial"
```
## Emulated/Virtualized environment
- Operating system: NixOS unstable
- OS/kernel version: `Linux 5.10.89 #1-NixOS SMP Wed Dec 29 11:26:08 UTC 2021 armv7l GNU/Linux`
- Architecture: `armv7l`
## Description of problem
<!-- Describe the problem, including any error/crash messages seen. -->
I was able to run my armv7l guest on RPI4 8G using qemu 6.2, but on 7.0 it doesn't work:
`qemu-kvm: Addressing limited to 32 bits, but memory exceeds it by 3221225472 bytes`.
The only reference I found is this issue: https://gitlab.com/qemu-project/qemu/-/issues/903
## Steps to reproduce
1. `-M virt,highmem=off,gic-version=host,accel=kvm`
2. `-cpu host,aarch64=off`
3. `-m 6G`
## Additional information
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issue
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