What were you trying to do that didn't work?
Start virtiofsd with a non-root user, and enable a range of UID/GID to virtiofsd user namespace, then boot up a win2019 guest, and mount virtiofs with the mapping UID/GID. After the virtiofs was started, I tried to create a file in it, but failed.

Please provide the package NVR for which bug is seen:
qemu-kvm-8.1.0-2.el9.x86_64
kernel-5.14.0-367.el9.x86_64
virtiofsd-1.7.2-1.el9.x86_64
edk2-ovmf-20230524-3.el9.noarch
virtio-win-prewhql-0.1-242

How reproducible:
100%

Steps to reproduce
1. add a common user on host

[root@dell-per750-33 home]# useradd user1

[root@dell-per750-33 home]# id user1
uid=1001(user1) gid=1001(user1) groups=1001(user1)

2. get subuid of the common user

[root@dell-per750-33 home]# cat /etc/subuid
test:100000:65536
user1:165536:65536

3. give executable permission for the common user's home dir
[root@dell-per750-33 home]# chmod -R go+x user1

4. create a shared dir under user1's home dir and give write permission for all users.
[root@dell-per750-33 user1]# ll
total 0
drwxrwxrwx 2 root root 47 Nov 3 04:06 test

5. switch to user1 and start virtiofsd with mapping list '--uid-map :0:165536:65536: --gid-map :0:165536:65536'
[user1@dell-per750-33 root]$ /usr/libexec/virtiofsd --shared-dir /home/user1/test --socket-path /tmp/sock2 --uid-map :0:165536:65536: --gid-map :0:165536:65536:
[2023-11-07T02:46:32Z WARN virtiofsd::limits] Failure when trying to set the limit to 1000000, the hard limit (8192) of open file descriptors is used instead.
[2023-11-07T02:46:32Z INFO virtiofsd] Waiting for vhost-user socket connection...

ps aux |grep virtiofsd
165536 1101269 0.0 0.0 5040 3616 pts/5 S+ 03:36 0:00 /usr/libexec/virtiofsd --shared-dir /home/user1/test --socket-path /tmp/sock2 --uid-map :0:165536:65536: --gid-map :0:165536:65536:
165536 1101273 0.0 0.0 4317664 3784 pts/5 Sl+ 03:36 0:00 /usr/libexec/virtiofsd --shared-dir /home/user1/test --socket-path /tmp/sock2 --uid-map :0:165536:65536: --gid-map :0:165536:65536:

6. boot up win2019 guest and start virtiofs.exe to get a shared volume.
virtiofs.exe -o 165536:165536

7. Try to create a file in the shared volume z:

Expected results
Create file successfully.

Actual results
Failed to create a file, it said 'File Too Large...'

Other info:
when start virtiofs.exe without "UID:GID", can create a new file.
virtiofs.exe -o 0:0 , also can create a new file.

The file on host.
rw-rw-r- 1 165536 165536 0 Nov 6 21:53 dgf.txt
rw-rw-r- 1 165536 165536 0 Nov 6 21:52 sfddf.txt