linux-kernel - Re: [RFC PATCH 0/5] kobject: Add and use init predicate

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Date:   Thu, 2 May 2019 13:42:20 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     "Tobin C. Harding" <tobin@...nel.org>
cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>, Petr Mladek <pmladek@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] kobject: Add and use init predicate

> Testing
> -------
> 
> Kernel build configuration
> 
> 	$ egrep LIVEPATCH .config
> 	CONFIG_HAVE_LIVEPATCH=y
> 	CONFIG_LIVEPATCH=y
> 	CONFIG_TEST_LIVEPATCH=m
> 
> 	$ egrep FTRACE .config
> 	CONFIG_KPROBES_ON_FTRACE=y
> 	CONFIG_HAVE_KPROBES_ON_FTRACE=y
> 	CONFIG_HAVE_DYNAMIC_FTRACE=y
> 	CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS=y
> 	CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
> 	CONFIG_FTRACE=y
> 	CONFIG_FTRACE_SYSCALLS=y
> 	CONFIG_DYNAMIC_FTRACE=y
> 	CONFIG_DYNAMIC_FTRACE_WITH_REGS=y
> 	CONFIG_FTRACE_MCOUNT_RECORD=y
> 	# CONFIG_FTRACE_STARTUP_TEST is not set
> 
> Builds fine but doesn't boot in Qemu.  I've never run dynamic Ftrace, it
> appears to crash during this.  Was hoping to run the livepatch tests but
> not sure how to at this moment.  Is dynamic Ftrace and livepatch testing
> something that can even be done in a VM or do I need to do this or
> baremetal?

It definitely should work in VM/qemu. We use it like that all the time.

Miroslav