From: "H. Peter Anvin" <hpa@zytor.com>
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Jesse Brandeburg <jesse.brandeburg@gmail.com>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
NetDEV list <netdev@vger.kernel.org>,
"Brandeburg, Jesse" <jesse.brandeburg@intel.com>
Subject: Re: Subject: [PATCH 1/2] x86: get back 15 vectors
Date: Mon, 04 Jan 2010 11:50:23 -0800 [thread overview]
Message-ID: <4B42467F.5040008@zytor.com> (raw)
In-Reply-To: <1262634353.2700.49.camel@sbs-t61.sc.intel.com>
On 01/04/2010 11:45 AM, Suresh Siddha wrote:
> On Mon, 2010-01-04 at 11:35 -0800, Yinghai Lu wrote:
>> sth like this?
>>
>> Subject: [PATCH 1/2] x86: get back 16 vectors
>>
>> -v2: according to hpa that we could start from 0x10
>> according to Eric, we should hold 16 vectors for IRQ MOVE
>>
>> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
>>
>
> Yinghai we have to change IRQ_MOVE_CLEANUP_VECTOR to 0x1f or so. From
> the cpu perspective this vector is documented as illegal, so we need to
> check if this change will work on the cpu's we have today to get some
> confidence.
>
It's documented as reserved, not illegal. The ability for the APIC to
generate vectors starting at 0x10 is documented, as is the ability for
the CPU to receive any vector number as an interrupt -- in fact, the
legacy BIOS relies on being able to receive interrupts starting at
vector 0x08. It causes problems galore, but only at the software level.
-hpa
next prev parent reply other threads:[~2010-01-04 19:51 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-25 8:42 [PATCH] x86: increase NR_IRQS and nr_irqs Yinghai Lu
2009-12-28 9:47 ` Ingo Molnar
2009-12-29 5:08 ` [PATCH -v2] " Yinghai Lu
2009-12-30 12:21 ` [tip:x86/apic] x86: Increase " tip-bot for Yinghai Lu
2010-01-04 3:06 ` [PATCH -v2] x86: increase " Jesse Brandeburg
2010-01-04 3:20 ` Yinghai Lu
2010-01-04 6:56 ` Subject: [PATCH 1/2] x86: get back 15 vectors Yinghai Lu
2010-01-04 16:18 ` Eric W. Biederman
2010-01-04 18:40 ` Yinghai Lu
2010-01-04 19:04 ` Eric W. Biederman
2010-01-04 19:14 ` H. Peter Anvin
2010-01-04 19:01 ` H. Peter Anvin
2010-01-04 19:09 ` Eric W. Biederman
2010-01-04 19:35 ` Yinghai Lu
2010-01-04 19:45 ` Suresh Siddha
2010-01-04 19:50 ` H. Peter Anvin [this message]
2010-01-05 0:05 ` Suresh Siddha
2010-01-05 0:16 ` Yinghai Lu
2010-01-05 5:30 ` [tip:x86/apic] x86, apic: Reclaim IDT vectors 0x20-0x2f tip-bot for H. Peter Anvin
2010-01-04 19:48 ` Subject: [PATCH 1/2] x86: get back 15 vectors H. Peter Anvin
2010-01-04 20:06 ` Yinghai Lu
2010-01-04 20:14 ` Eric W. Biederman
2010-01-04 20:33 ` Yinghai Lu
2010-01-04 21:10 ` H. Peter Anvin
2010-01-04 21:20 ` Yinghai Lu
2010-01-04 21:33 ` H. Peter Anvin
2010-01-04 22:01 ` Yinghai Lu
2010-01-04 23:03 ` H. Peter Anvin
2010-01-04 23:32 ` Yinghai Lu
2010-01-04 23:38 ` H. Peter Anvin
2010-01-04 23:42 ` Yinghai Lu
2010-01-04 23:49 ` Yinghai Lu
2010-01-04 23:59 ` H. Peter Anvin
2010-01-05 5:30 ` [tip:x86/apic] x86, apic: Don't waste a vector to improve vector spread tip-bot for H. Peter Anvin
2010-01-04 20:08 ` Subject: [PATCH 1/2] x86: get back 15 vectors Eric W. Biederman
2010-01-04 6:58 ` [PATCH 2/2] x86: get more exact nr_irqs Yinghai Lu
2010-01-04 16:55 ` Eric W. Biederman
2010-01-04 19:03 ` Yinghai Lu
2010-01-04 19:16 ` Eric W. Biederman
2010-01-04 19:30 ` H. Peter Anvin
2010-01-04 19:47 ` Yinghai Lu
2010-01-04 20:05 ` Eric W. Biederman
2010-01-04 21:50 ` H. Peter Anvin
2010-01-04 6:59 ` [PATCH 1/2] x86: get back 15 vectors Yinghai Lu
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