Commit e0193fa4 authored by Committed by Vikram NarayananBrowse files
Basic lcd module create, run, and destroy.
This code is ugly, but it's working. Tested with basic module, and appears to be working properly. I will soon incorporate the patched modprobe into the kernel tree, and then this code will be usable by everyone. The ipc code is still unimplemented. The only hypercall handled is yield. Also note that other exit conditions (e.g. external interrupt) have not been fully tested. Overview: -- kernel code calls lcd_create_as_module with the module's name -- lcd_create_as_module loads the module using request_lcd_module (request_lcd_module calls the patched modprobe to load the module, and the patched modprobe calls back into the lcd driver via the ioctrl interface to load the module) -- lcd_create_as_module then finds the loaded module, spawns a kernel thread and passes off the module to it -- the kernel thread initializes the lcd and maps the module inside it, then suspends itself -- lcd_run_as_module wakes up the kernel thread and tells it to run -- lcd_delete_as_module stops the kernel thread and deletes the module from the host kernel File-by-file details: arch/x86/include/asm/lcd-domains-arch.h arch/x86/lcd-domains/lcd-domains-arch-tests.c arch/x86/lcd-domains/lcd-domains-arch.c -- lcd was not running in 64-bit mode, and my checks had one subtle bug -- fixed %cr3 load to properly load vmcs first -- fixed set program counter to use guest virtual rather than guest physical address include/linux/sched.h -- added struct lcd to task_struct include/linux/init_task.h -- lcd pointer set to null when task_struct is initialized include/linux/module.h kernel/module.c -- made init_module and delete_module system calls callable from kernel code -- available in module.h via do_sys_init_module and do_sys_delete_module -- simply moved the majority of the guts of the system calls into a non-system call, exported routine -- take an extra flag, for_lcd; when set, the init code skips over running (and deallocating) the module's init code, and the delete code skips over running the module exit -- system calls from user code set for_lcd = 0; this ensures existing code still works include/linux/kmod.h kernel/kmod.c kernel/sysctl.c -- changed __request_module to __do_request_module; takes one extra argument, for_lcd -- __request_module ==> __do_request_module with for_lcd = 0 -- request_lcd_module ==> __do_request_module with for_lcd = 1 -- call_modprobe conditionally uses lcd_modprobe_path, the path to a patched modprobe accessible via sysfs include/lcd-domains/lcd-domains.h -- added lcd status enum; see source code doc -- three routines for creating/running/destroying lcd's that use modules; see source code doc include/uapi/linux/lcd-domains.h -- added interface defns for patched modprobe to call into lcd driver for module init; lcd driver loads module (via slightly refactored module.c code) on behalf of modprobe virt/lcd-domains/lcd-domains.c -- implementation of routines for modules inside lcd's -- implementation of module init / delete for lcd's (uses patched module.c code) virt/lcd-domains/Kconfig virt/lcd-domains/Makefile virt/lcd-domains/lcd-module-load-test.c virt/lcd-domains/lcd-tests.c -- added test module for lcd module code -- test runs automatically when lcd module is inserted
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