Steven Rostedt (VMware) 02a474ca26 ftrace/x86: Allow for arguments to be passed in to ftrace_regs by default ... Currently, the only way to get access to the registers of a function via a ftrace callback is to set the "FL_SAVE_REGS" bit in the ftrace_ops. But as this saves all regs as if a breakpoint were to trigger (for use with kprobes), it is expensive. The regs are already saved on the stack for the default ftrace callbacks, as that is required otherwise a function being traced will get the wrong arguments and possibly crash. And on x86, the arguments are already stored where they would be on a pt_regs structure to use that code for both the regs version of a callback, it makes sense to pass that information always to all functions. If an architecture does this (as x86_64 now does), it is to set HAVE_DYNAMIC_FTRACE_WITH_ARGS, and this will let the generic code that it could have access to arguments without having to set the flags. This also includes having the stack pointer being saved, which could be used for accessing arguments on the stack, as well as having the function graph tracer not require its own trampoline! Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>		2020-11-13 12:14:59 -05:00
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asm	ftrace/x86: Allow for arguments to be passed in to ftrace_regs by default	2020-11-13 12:14:59 -05:00
uapi/asm	x86/kvm: Reserve KVM_FEATURE_MSI_EXT_DEST_ID	2020-10-28 13:52:05 -04:00