linux-kernel - Re: [PATCH -v2] x86: Add an archinfo dumper module

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Date:	Sun, 7 Feb 2016 16:01:06 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Lutomirski <luto@...capital.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Brian Gerst <brgerst@...il.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v2] x86: Add an archinfo dumper module

On 02/04/16 07:22, Borislav Petkov wrote:
> Here's v2 with the stuff we talked about, implemented. I've added
> 'control_regs' file too so that you can do:
> 
> $ cat /sys/kernel/debug/x86/archinfo/control_regs
> CR4: [-|-|SMEP|OSXSAVE|-|-|-|-|OSXMMEXCPT|OSFXSR|-|PGE|MCE|PAE|PSE|-|-|-|-]: 0x1406f0
> 
> for example. Yeah, only CR4 right now.
> 
> Off the top of my head, we would need "msrs" which dumps EFER and a
> bunch of other interesting MSRs along with the names of the set bits.

Is there a reason why all this parsing has to be done in kernel space?

	-hpa