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loongson3-virt machine fails to bring up secondary CPUs
Description of problem:
When booting Debian netboot on `loongson3-virt` machine with SMP, cores other than number 0 fail to come up. Boot without SMP is successful.
I provided the details of the first combination I tested, but I have also tested on an x86_64 host, as well as with Debian 11 (kernel `5.10.0-22-loongson-3`) on both hosts, with the same results.
Steps to reproduce:
1. `wget https://ftp.debian.org/debian/dists/bookworm/main/installer-mips64el/current/images/loongson-3/netboot/vmlinuz-6.1.0-10-loongson-3`
2. `wget https://ftp.debian.org/debian/dists/bookworm/main/installer-mips64el/current/images/loongson-3/netboot/initrd.gz`
3. `qemu-system-mips64el -M loongson3-virt -kernel vmlinuz-6.1.0-10-loongson-3 -initrd initrd.gz -append "console=ttyS0" -serial stdio -smp 2`
Additional information:
Boot is successful when removing `-smp 2` from command line. With it present, the following error is in `dmesg` (extends to all other CPUs when a larger SMP value is passed):
```
[ 2.248229] rcu: Hierarchical SRCU implementation.
[ 2.248446] rcu: Max phase no-delay instances is 1000.
[ 2.647997] smp: Bringing up secondary CPUs ...
[ 2.749706] Booting CPU#1...
[ 7.093229] CPU1: failed to start
[ 7.096508] smp: Brought up 1 node, 1 CPU
```
The boot eventually stalls after this.
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