From: Zachary Amsden <zach@vmware.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@osdl.org>, Chris Wright <chrisw@osdl.org>,
Linus Torvalds <torvalds@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Virtualization Mailing List <virtualization@lists.osdl.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Martin Bligh <mbligh@mbligh.org>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH 14/21] i386 Apm is on cpu zero only
Date: Tue, 08 Nov 2005 04:53:43 -0800 [thread overview]
Message-ID: <43709FD7.1030905@vmware.com> (raw)
In-Reply-To: <20051108073315.GE28201@elte.hu>
Ingo Molnar wrote:
>* Zachary Amsden <zach@vmware.com> wrote:
>
>
>
>>APM BIOS code has a protective wrapper that runs it only on CPU zero.
>>Thus, no need to set APM BIOS segments in the GDT for other CPUs.
>>
>>
>
>hm, do we want (need) to have that CPU#0 assumption forever?
>
>
Can't hurt, and APM is largely obsolete because of ACPI, so I'm only
concerned with trimming and keeping adequate protection of the kernel
from APM code while maintaining correctness. I don't have a nice set of
old machines with enough wacky APM BIOSen to validate that unpinning the
CPU is ok.
Zach
next prev parent reply other threads:[~2005-11-08 12:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-08 4:33 [PATCH 14/21] i386 Apm is on cpu zero only Zachary Amsden
2005-11-08 7:33 ` Ingo Molnar
2005-11-08 12:53 ` Zachary Amsden [this message]
2005-11-08 13:54 ` Alan Cox
2005-11-08 13:26 ` Ingo Molnar
2005-11-08 14:51 ` H. Peter Anvin
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