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From: Rudolf Marek <r.marek@assembler.cz>
To: Mikael Pettersson <mikpe@it.uu.se>
Cc: Jean Delvare <khali@linux-fr.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexey Dobriyan <adobriyan@openvz.org>,
	Dave Jones <davej@redhat.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] MSR: Add support for safe variants
Date: Wed, 28 Mar 2007 23:04:50 +0200	[thread overview]
Message-ID: <460AD872.6020609@assembler.cz> (raw)
In-Reply-To: <20070326140911.877430f5.khali@linux-fr.org>

Hello Mikael,

> Maybe I'm in the minority here, but I for one strongly believe
> that any attempt to access an MSR "which might not be there" is
> inherently wrong. It implies that your HW detection is incomplete,
> which in combination with MSR accesses means that you may end up
> accessing MSRs that aren't at all what you think they should be.

Well I have some info from Intel, but the register is simply not always there. 
So instead of oopsing kernel, handling the exception is much better.

For further details please check:
http://softwarecommunity.intel.com/isn/Community/en-US/forums/thread/30229027.aspx

(last page) I may have more info in the future.

> Who supplies these imprecise MSR definitions anyway?

Yes Intel, please check the thread. Sometimes similar to catch 22 ;)

Rudolf

  reply	other threads:[~2007-03-28 21:05 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-26 11:57 Mikael Pettersson
2007-03-26 12:09 ` Jean Delvare
2007-03-28 21:04   ` Rudolf Marek [this message]
  -- strict thread matches above, loose matches on Subject: below --
2007-03-25 12:18 Jean Delvare
2007-03-25 22:22 ` Andrew Morton
2007-03-26 11:29   ` Jean Delvare
2007-03-26 11:55     ` Andrew Morton

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