From: Andy Lutomirski <luto@amacapital.net>
To: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@kernel.org>, X86 ML <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Brian Gerst <brgerst@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>, Willy Tarreau <w@1wt.eu>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 1/3] x86/entry/64: Refactor IRQ stacks and make then NMI-safe
Date: Fri, 24 Jul 2015 21:59:16 -0700 [thread overview]
Message-ID: <CALCETrW8D2-iPga4yveHEM+XgUwJocbBkpKyM5sWqKrRq2-BrQ@mail.gmail.com> (raw)
In-Reply-To: <20150725043218.GD32606@nazgul.tnic>
On Fri, Jul 24, 2015 at 9:32 PM, Borislav Petkov <bp@alien8.de> wrote:
> On Fri, Jul 24, 2015 at 09:28:47PM -0700, Andy Lutomirski wrote:
>> Yeah, I'm going to submit v2 with the simple approach. I admit I'm
>> rather fond of xadd as a way to switch rsp and set a flag at the same
>> time, though :)
>
> I know you are.
>
> But people will rip your head out if you added 60 cycles to the IRQ
> path.
And people will give me five new heads if I ignore Linus and do RET
even with IF=1, saving 300 cycles?
--Andy
next prev parent reply other threads:[~2015-07-25 4:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-23 22:37 [PATCH 0/3] x86_64: Make int3 non-magical Andy Lutomirski
2015-07-23 22:37 ` [PATCH 1/3] x86/entry/64: Refactor IRQ stacks and make then NMI-safe Andy Lutomirski
2015-07-24 6:08 ` Andy Lutomirski
2015-07-24 10:25 ` Borislav Petkov
2015-07-24 18:02 ` Andy Lutomirski
2015-07-25 4:16 ` Borislav Petkov
2015-07-25 4:28 ` Andy Lutomirski
2015-07-25 4:32 ` Borislav Petkov
2015-07-25 4:59 ` Andy Lutomirski [this message]
2015-07-25 8:39 ` Borislav Petkov
2015-07-25 17:56 ` Linus Torvalds
2015-07-25 17:59 ` Andy Lutomirski
2015-07-25 18:12 ` Linus Torvalds
2015-08-05 8:59 ` Ingo Molnar
2015-08-05 18:24 ` Andy Lutomirski
2015-08-05 18:27 ` Steven Rostedt
2015-08-05 18:32 ` Andy Lutomirski
2015-08-22 13:55 ` Ingo Molnar
2015-07-23 22:37 ` [PATCH 2/3] x86/entry/64: Teach idtentry to use the IRQ stack Andy Lutomirski
2015-07-23 22:37 ` [PATCH 3/3] x86/entry/64: Move #BP from IST to " Andy Lutomirski
2015-07-24 11:02 ` Borislav Petkov
2015-07-23 22:39 ` [PATCH 0/3] x86_64: Make int3 non-magical Andy Lutomirski
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