From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: eranian@google.com, linux-kernel@vger.kernel.org,
Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 2/3] x86, perf: Support custom test values for extra_regs
Date: Tue, 30 Jun 2015 13:19:07 +0200 [thread overview]
Message-ID: <20150630111907.GF3644@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1435612935-24425-2-git-send-email-andi@firstfloor.org>
On Mon, Jun 29, 2015 at 02:22:14PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@linux.intel.com>
>
> Current kernels always test extra registers at boot with RMW
> cycle, to catch lying virtual machines.
>
> For a new register the standard 0x1ff test value does not work,
> as 0x1ff is not a valid value and causes an #GP.
>
> Add the ability to add custom test values to an extra_reg
> into the description tables.
Just wondering; is there not a test value that works for all registers?
next prev parent reply other threads:[~2015-06-30 11:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-29 21:22 [PATCH 1/3] x86, perf: Make merge_attr global to use from perf_event_intel Andi Kleen
2015-06-29 21:22 ` [PATCH 2/3] x86, perf: Support custom test values for extra_regs Andi Kleen
2015-06-30 11:19 ` Peter Zijlstra [this message]
2015-06-30 15:44 ` Andi Kleen
2015-06-29 21:22 ` [PATCH 3/3] x86, perf: Add PEBS frontend profiling for Skylake Andi Kleen
2015-07-17 19:47 ` Stephane Eranian
2015-07-17 20:09 ` Andi Kleen
2015-07-17 20:11 ` Thomas Gleixner
2015-07-17 20:33 ` Andi Kleen
2015-07-17 21:01 ` Stephane Eranian
2015-07-17 21:19 ` Andi Kleen
2015-07-17 22:00 ` Stephane Eranian
2015-07-17 23:31 ` Andi Kleen
2015-07-17 23:52 ` Stephane Eranian
2015-07-18 14:23 ` Andi Kleen
2015-07-17 22:16 ` Thomas Gleixner
2015-07-17 20:41 ` Stephane Eranian
2015-07-17 20:52 ` Andi Kleen
2015-07-17 21:05 ` Peter Zijlstra
2015-07-17 21:18 ` Andi Kleen
2015-07-17 22:23 ` Thomas Gleixner
2015-08-04 9:00 ` [tip:perf/core] perf/x86: Make merge_attr() global to use from perf_event_intel tip-bot for Andi Kleen
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