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author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-03-31 16:16:58 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-03-31 16:16:58 -0700 |
commit | e8b767f5e04097aaedcd6e06e2270f9fe5282696 (patch) | |
tree | 1d8ba4a3bf81ea9ca7a0a3506745eccc9d93b058 /Documentation | |
parent | a87a08e3bf2decaed29c4dfde3916676f9b966a8 (diff) | |
parent | 82017457957a550d7d00dde419435dd74a890887 (diff) | |
download | linux-e8b767f5e04097aaedcd6e06e2270f9fe5282696.tar.gz |
Merge tag 'for-linus-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml
Pull UML updates from Richard Weinberger: - Devicetree support (for testing) - Various cleanups and fixes: UBD, port_user, uml_mconsole - Maintainer update * tag 'for-linus-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: run_helper: Write error message to kernel log on exec failure on host um: port_user: Improve error handling when port-helper is not found um: port_user: Allow setting path to port-helper using UML_PORT_HELPER envvar um: port_user: Search for in.telnetd in PATH um: clang: Strip out -mno-global-merge from USER_CFLAGS docs: UML: Mention telnetd for port channel um: Remove unused timeval_to_ns() function um: Fix uml_mconsole stop/go um: Cleanup syscall_handler_t definition/cast, fix warning uml: net: vector: fix const issue um: Fix WRITE_ZEROES in the UBD Driver um: Migrate vector drivers to NAPI um: Fix order of dtb unflatten/early init um: fix and optimize xor select template for CONFIG64 and timetravel mode um: Document dtb command line option lib/logic_iomem: correct fallback config references um: Remove duplicated include in syscalls_64.c MAINTAINERS: Update UserModeLinux entry
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/virt/uml/user_mode_linux_howto_v2.rst | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/virt/uml/user_mode_linux_howto_v2.rst b/Documentation/virt/uml/user_mode_linux_howto_v2.rst index d5ad96c795f6..863f67b72c05 100644 --- a/Documentation/virt/uml/user_mode_linux_howto_v2.rst +++ b/Documentation/virt/uml/user_mode_linux_howto_v2.rst @@ -1193,6 +1193,26 @@ E.g. ``os_close_file()`` is just a wrapper around ``close()`` which ensures that the userspace function close does not clash with similarly named function(s) in the kernel part. +Using UML as a Test Platform +============================ + +UML is an excellent test platform for device driver development. As +with most things UML, "some user assembly may be required". It is +up to the user to build their emulation environment. UML at present +provides only the kernel infrastructure. + +Part of this infrastructure is the ability to load and parse fdt +device tree blobs as used in Arm or Open Firmware platforms. These +are supplied as an optional extra argument to the kernel command +line:: + + dtb=filename + +The device tree is loaded and parsed at boottime and is accessible by +drivers which query it. At this moment in time this facility is +intended solely for development purposes. UML's own devices do not +query the device tree. + Security Considerations ----------------------- |