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: Tue, 19 Jan 2010 09:03:20 -0800 [thread overview]
Message-ID: <4B55E5D8.1070402@zytor.com> (raw)
In-Reply-To: <20100119065537.GF14345@redhat.com>
On 01/18/2010 10:55 PM, Gleb Natapov wrote:
>>
>> What I mean is that vector 14 is page faults -- that's what it is all
>> about. Why on Earth do you need another vector?
>>
> Because this is not usual pagefault that tell the OS that page is not
> mapped. This is a notification to a guest OS that the page it is trying
> to access is swapped out by the host OS. There is nothing guest can do
> about it except schedule another task. So the guest should handle both
> type of exceptions: usual #PF when page is not mapped by the guest and
> new type of notifications. Ideally we would use one of unused exception
> vectors for new type of notifications.
>
Ah, this kind of stuff. We have talked about this in the past, and the
right way to do that is to have the guest OS pick a vector our of the
standard 0x20-0xff range, and then notify the hypervisor via a hypercall
which vector to use.
In Linux this means marking it as a system vector. Note that there are
real hardware system vectors which will be mutually exclusive with this,
e.g. the UV one.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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next prev parent reply other threads:[~2010-01-19 17:06 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
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 [this message]
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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