From: "H. Peter Anvin" <hpa@zytor.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
kvm@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, avi@redhat.com, mingo@elte.hu,
tglx@linutronix.de, riel@redhat.com, cl@linux-foundation.org
Subject: Re: [PATCH v3 04/12] Add "handle page fault" PV helper.
Date: Mon, 18 Jan 2010 00:34:16 -0800 [thread overview]
Message-ID: <4B541D08.9040802@zytor.com> (raw)
In-Reply-To: <20100117144411.GI31692@redhat.com>
On 01/17/2010 06:44 AM, Gleb Natapov wrote:
> On Thu, Jan 14, 2010 at 06:31:07PM +0100, Peter Zijlstra wrote:
>> On Tue, 2010-01-05 at 16:12 +0200, Gleb Natapov wrote:
>>> Allow paravirtualized guest to do special handling for some page faults.
>>>
>>> The patch adds one 'if' to do_page_fault() function. The call is patched
>>> out when running on physical HW. I ran kernbech on the kernel with and
>>> without that additional 'if' and result were rawly the same:
>>
>> So why not program a different handler address for the #PF/#GP faults
>> and avoid the if all together?
> I would gladly use fault vector reserved by x86 architecture, but I am
> not sure Intel will be happy about it.
>
That's what it's there for... see Peter Z.'s response.
-hpa
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next prev parent reply other threads:[~2010-01-18 8:37 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
2010-01-18 8:34 ` H. Peter Anvin [this message]
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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