From: "H. Peter Anvin" <hpa@zytor.com>
To: Andi Kleen <ak@suse.de>
Cc: Alexey Dobriyan <adobriyan@openvz.org>,
akpm@osdl.org, linux-kernel@vger.kernel.org,
davej@codemonkey.org.uk, devel@vger.kernel.org
Subject: Re: [PATCH] rdmsr_on_cpu, wrmsr_on_cpu
Date: Thu, 18 Jan 2007 15:40:56 -0800 [thread overview]
Message-ID: <45B00588.3010207@zytor.com> (raw)
In-Reply-To: <200701191021.16706.ak@suse.de>
Andi Kleen wrote:
>> HOWEVER -- and this is where things get gnarly -- the CPUID and MSR
>> drivers would really like to be able to execute CPUID, WRMSR and RDMSR
>> with the entire GPR register set (except the stack pointer) pre-set and
>> post-captured, since it's highly likely that there are going to be
>> nonstandard MSRs and CPUID levels (already witness Intel breaking the
>> CPUID architecture by introducing %ecx dependencies.)
>
> That looks like such a specialized requirement that I would suggest
> you keep that in the drivers. The interface for most users would be just
> too ugly
>
It would, but rather than having the paravirtualization interfaces
duplicate out of control, we could/should implement the less generic
features in terms of the more generic, above the pvz layer.
-hpa
next prev parent reply other threads:[~2007-01-18 23:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-18 14:45 [PATCH] rdmsr_on_cpu, wrmsr_on_cpu Alexey Dobriyan
2007-01-18 22:14 ` H. Peter Anvin
2007-01-18 23:21 ` Andi Kleen
2007-01-18 23:40 ` H. Peter Anvin [this message]
2007-01-19 0:40 ` Andi Kleen
2007-01-19 0:45 ` H. Peter Anvin
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