From: Peter Zijlstra <peterz@infradead.org>
To: kan.liang@intel.com
Cc: andi@firstfloor.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH V4 1/2] perf ignore LBR and extra_regs.
Date: Wed, 9 Jul 2014 16:16:31 +0200 [thread overview]
Message-ID: <20140709141631.GE9918@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1404838181-3911-1-git-send-email-kan.liang@intel.com>
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On Tue, Jul 08, 2014 at 09:49:40AM -0700, kan.liang@intel.com wrote:
> +/*
> + * Under certain circumstances, access certain MSR may cause #GP.
> + * The function tests if the input MSR can be safely accessed.
> + */
> +static inline bool check_msr(unsigned long msr)
> +{
> + u64 value;
> +
> + if (rdmsrl_safe(msr, &value) < 0)
> + return false;
> + if (wrmsrl_safe(msr, value) < 0)
> + return false;
> + return true;
> +}
What does this thing return after patch 2? does the write still fault or
will KVM silently take writes too?
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next prev parent reply other threads:[~2014-07-09 14:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-08 16:49 [PATCH V4 1/2] perf ignore LBR and extra_regs kan.liang
2014-07-08 16:49 ` [PATCH V4 2/2] kvm: " kan.liang
2014-07-09 8:32 ` [PATCH V4 1/2] perf " Peter Zijlstra
2014-07-09 9:14 ` Peter Zijlstra
2014-07-09 9:19 ` Peter Zijlstra
2014-07-09 9:27 ` Peter Zijlstra
2014-07-09 14:04 ` Liang, Kan
2014-07-09 14:16 ` Peter Zijlstra [this message]
2014-07-09 14:32 ` Liang, Kan
2014-07-09 14:58 ` Peter Zijlstra
2014-07-09 15:43 ` Liang, Kan
2014-07-09 16:41 ` Peter Zijlstra
2014-07-09 19:32 ` Liang, Kan
2014-07-10 9:02 ` Peter Zijlstra
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