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From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Gleb Natapov <gleb@redhat.com>,
	kvm@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, avi@redhat.com, mingo@elte.hu,
	tglx@linutronix.de, hpa@zytor.com, riel@redhat.com,
	cl@linux-foundation.org
Subject: Re: [PATCH v3 04/12] Add "handle page fault" PV helper.
Date: Mon, 18 Jan 2010 10:53:20 +0100	[thread overview]
Message-ID: <87ljfv4u3z.fsf@basil.nowhere.org> (raw)
In-Reply-To: <1263740980.557.20980.camel@twins> (Peter Zijlstra's message of "Sun, 17 Jan 2010 16:09:40 +0100")

Peter Zijlstra <peterz@infradead.org> writes:
>
> Whatever are we doing to end up in do_page_fault() as it stands? Surely
> we can tell the CPU to go elsewhere to handle faults?
>
> Isn't that as simple as calling set_intr_gate(14, my_page_fault)
> somewhere on the cpuinit instead of the regular page_fault handler?

That typically requires ugly ifdefs in entry*S and could be described
as code obfuscation ("come from")

As long as he avoids a global reference (patch) the if should be practially
free anyways.

-Andi
-- 
ak@linux.intel.com -- Speaking for myself only.

  parent reply	other threads:[~2010-01-18  9:53 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-05 14:12 [PATCH v3 00/12] KVM: Add host swap event notifications for PV guest Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 01/12] Move kvm_smp_prepare_boot_cpu() from kvmclock.c to kvm.c Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 02/12] Add PV MSR to enable asynchronous page faults delivery Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 03/12] Add async PF initialization to PV guest Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 04/12] Add "handle page fault" PV helper Gleb Natapov
2010-01-14 17:31   ` Peter Zijlstra
2010-01-17 14:44     ` Gleb Natapov
2010-01-17 15:09       ` Peter Zijlstra
2010-01-17 15:12         ` Gleb Natapov
2010-01-18  9:53         ` Andi Kleen [this message]
2010-01-18  8:34       ` H. Peter Anvin
2010-01-18  8:50         ` Gleb Natapov
2010-01-19  1:53           ` H. Peter Anvin
2010-01-19  6:55             ` Gleb Natapov
2010-01-19 17:03               ` H. Peter Anvin
2010-01-19 17:44                 ` Gleb Natapov
2010-01-19 20:10                   ` H. Peter Anvin
2010-01-20 10:02                     ` Gleb Natapov
2010-01-20 12:00                       ` Avi Kivity
2010-01-20 17:18                         ` Rik van Riel
2010-01-21  8:56                           ` Avi Kivity
2010-01-20 18:45                         ` H. Peter Anvin
2010-01-21  8:58                           ` Avi Kivity
2010-01-20 17:43                       ` H. Peter Anvin
2010-01-21  9:02                         ` Avi Kivity
2010-01-21  9:04                           ` Gleb Natapov
2010-01-21  9:05                             ` Avi Kivity
2010-01-21 15:47                           ` H. Peter Anvin
2010-01-22  7:25                             ` Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 05/12] Export __get_user_pages_fast Gleb Natapov
2010-01-17 15:46   ` Christoph Hellwig
2010-01-05 14:12 ` [PATCH v3 06/12] Add get_user_pages() variant that fails if major fault is required Gleb Natapov
2010-01-17 15:43   ` Christoph Hellwig
2010-01-05 14:12 ` [PATCH v3 07/12] Maintain memslot version number Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 08/12] Inject asynchronous page fault into a guest if page is swapped out Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 09/12] Retry fault before vmentry Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 10/12] Handle async PF in non preemptable context Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 11/12] Let host know whether the guest can handle async PF in non-userspace context Gleb Natapov
2010-01-05 14:12 ` [PATCH v3 12/12] Send async PF when guest is not in userspace too Gleb Natapov
2010-01-05 15:05 ` [PATCH v3 00/12] KVM: Add host swap event notifications for PV guest Jun Koi
2010-01-05 15:59   ` Rik van Riel
2010-01-05 16:04   ` Avi Kivity
2010-01-06 10:17     ` Jun Koi
2010-01-06 10:21       ` Gleb Natapov
2010-01-08 16:18 ` Marcelo Tosatti
2010-01-08 16:47   ` Gleb Natapov
2010-01-08 19:24   ` Rik van Riel
2010-01-08 19:30     ` Bryan Donlan
2010-01-08 19:55       ` Rik van Riel

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