jasonbu opened a new pull request, #18343:
URL: https://github.com/apache/nuttx/pull/18343
## Summary
This PR adds VirtIO 9P filesystem (v9fs) support for BUILD_KERNEL
configuration and enables it on the qemu-armv7a knsh board.
## Changes
1. v9fs: add va_to_pa for kernel build compatible
Add up_addrenv_va_to_pa() conversion for buffer addresses in v9fs client
read/write operations
This is required because in kernel build mode, virtual addresses need to be
converted to physical addresses for VirtIO device DMA operations
2. fs/v9fs: add support for KERNEL build, only transfer 4K once
Limit read/write transfer size to page boundary (CONFIG_MM_PGSIZE) in kernel
build
This handles non-contiguous physical memory pages - each transfer stays
within a single physical page
Use bufptr instead of directly modifying buffer pointer for proper iteration
3. board/armv7a/knsh: enable fdt/virtiommio/virtiov9fs support
Enable CONFIG_DEVICE_TREE=y
Enable CONFIG_DRIVERS_VIRTIO=y and CONFIG_DRIVERS_VIRTIO_MMIO=y
Enable CONFIG_FS_V9FS=y and CONFIG_V9FS_VIRTIO_9P=y
Adjust RAM settings: start from 0x40100000 with size 15728640 to accommodate
FDT
4. Documents/boards/qemu-armv7a: add knsh v9fs launch method
Add documentation for launching KNSH with VirtIO 9P filesystem
Include QEMU command with -fsdev and -device virtio-9p-device options
Document mount command: mount -t v9fs -o trans=virtio,tag=share /share
## Testing
CI-test, qemu-v7a v9fs mount and ls check if working for review hostfiles.
```bash
# Build knsh
$ ./tools/configure.sh qemu-armv7a:knsh
$ make V=1 -j`nproc`
$ make export V=1
$ cd ../apps
$ ./tools/mkimport.sh -z -x ../nuttx/nuttx-export-*.tar.gz
$ make import -j`nproc`
$ cd ../nuttx
# Run with v9fs
$ qemu-system-arm -semihosting -M virt -m 1024 -nographic \
-fsdev local,security_model=none,id=localshared,path=. \
-device virtio-9p-device,id=fs0,fsdev=localshared,mount_tag=share \
-kernel ./nuttx
# Inside nsh
nsh> mount -t v9fs -o trans=virtio,tag=share /share
nsh> ls /share
```
test result:
```bash
ostest_main: Exiting with status 0
nsh> ls -l /share/nuttx
-rwxrwxr-x 3367716 /share/nuttx
```
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