From: "H. Peter Anvin" <hpa@zytor.com>
To: Roland McGrath <roland@redhat.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
Mikael Pettersson <mikpe@it.uu.se>,
Andi Kleen <andi@firstfloor.org>,
mingo@elte.hu, tglx@linutronix.de, torvalds@linux-foundation.org,
akpm@linux-foundation.org, drepper@redhat.com,
Hongjiu.lu@intel.com, linux-kernel@vger.kernel.org,
arjan@linux.intel.com, rmk+lkml@arm.linux.org.uk, dan@debian.org,
asit.k.mallick@intel.com
Subject: Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions
Date: Wed, 21 May 2008 18:38:31 -0700 [thread overview]
Message-ID: <4834CE97.9080708@zytor.com> (raw)
In-Reply-To: <20080522005345.B994F26FA24@magilla.localdomain>
Roland McGrath wrote:
>> The biggest potential problem with this that I see is that relying on
>> CPUID can mess with certain virtualization solutions. Another option to
>> accomplish the same thing would be to have a system call (preferrably a
>> prctl, since it is at least in theory personality-dependent) to query
>> what information is included in the fpstate data - since it will always
>> be the same for any particular kernel.
>
> It's easy and cheap to add an indicator to the vDSO for this.
Yes, but I suspect for legacy apps running without vDSO might matter.
-hpa
next prev parent reply other threads:[~2008-05-22 1:46 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-13 1:10 [RFC] x86: xsave/xrstor support, ucontext_t extensions Suresh Siddha
2008-05-16 13:26 ` Mikael Pettersson
2008-05-18 1:34 ` Suresh Siddha
2008-05-19 14:52 ` Mikael Pettersson
2008-05-19 15:04 ` Andi Kleen
2008-05-19 16:29 ` H. Peter Anvin
2008-05-19 16:57 ` Suresh Siddha
2008-05-19 17:45 ` H. Peter Anvin
2008-05-20 1:57 ` Suresh Siddha
2008-05-20 8:58 ` Mikael Pettersson
2008-05-20 10:01 ` Andi Kleen
2008-05-20 13:19 ` Mikael Pettersson
2008-05-20 14:58 ` H. Peter Anvin
2008-05-20 15:20 ` Mikael Pettersson
2008-05-20 17:53 ` Suresh Siddha
2008-05-20 17:59 ` H. Peter Anvin
2008-05-22 0:28 ` H. Peter Anvin
2008-05-22 0:53 ` Roland McGrath
2008-05-22 1:38 ` H. Peter Anvin [this message]
2008-05-22 6:40 ` Roland McGrath
2008-05-22 7:18 ` H. Peter Anvin
2008-05-22 8:49 ` Mikael Pettersson
2008-05-22 8:57 ` Mikael Pettersson
2008-05-22 20:56 ` Suresh Siddha
2008-05-22 21:02 ` H. Peter Anvin
2008-05-22 21:29 ` Suresh Siddha
2008-05-22 21:34 ` H. Peter Anvin
2008-05-22 22:22 ` Mikael Pettersson
2008-05-23 1:48 ` Suresh Siddha
2008-05-23 2:12 ` Roland McGrath
2008-05-23 2:49 ` H. Peter Anvin
2008-05-23 18:09 ` Suresh Siddha
2008-06-06 0:28 ` x86: xsave/xrstor support; " H. Peter Anvin
2008-06-06 20:14 ` Suresh Siddha
2008-06-06 23:03 ` H. Peter Anvin
2008-05-23 2:45 ` [RFC] x86: xsave/xrstor support, " H. Peter Anvin
2008-05-23 11:46 ` Mikael Pettersson
2008-05-23 12:11 ` Andi Kleen
2008-05-22 21:32 ` Chris Wright
2008-05-22 22:15 ` Mikael Pettersson
2008-05-22 22:29 ` Chris Wright
2008-05-23 0:32 ` H. Peter Anvin
2008-05-23 0:44 ` Chris Wright
2008-05-22 22:36 ` Mikael Pettersson
2008-05-23 0:33 ` H. Peter Anvin
2008-05-23 0:42 ` Suresh Siddha
2008-05-23 1:33 ` Roland McGrath
2008-05-23 16:57 ` H. Peter Anvin
2008-05-23 17:50 ` Suresh Siddha
2008-05-23 2:27 ` H. Peter Anvin
2008-05-20 17:57 ` H. Peter Anvin
2008-05-20 14:55 ` H. Peter Anvin
2008-05-20 15:03 ` Andi Kleen
2008-05-20 20:10 ` Roland McGrath
2008-05-22 0:05 ` H. Peter Anvin
2008-05-22 0:47 ` Roland McGrath
2008-05-22 8:14 ` Andi Kleen
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