From: Rik van Riel <riel@redhat.com>
To: Jun Koi <junkoi2004@gmail.com>
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,
a.p.zijlstra@chello.nl, tglx@linutronix.de, hpa@zytor.com,
cl@linux-foundation.org
Subject: Re: [PATCH v3 00/12] KVM: Add host swap event notifications for PV guest
Date: Tue, 05 Jan 2010 10:59:42 -0500 [thread overview]
Message-ID: <4B4361EE.2030201@redhat.com> (raw)
In-Reply-To: <fdaac4d51001050705s3f46dd0fi948a3b3ea803fa51@mail.gmail.com>
On 01/05/2010 10:05 AM, Jun Koi wrote:
> On Tue, Jan 5, 2010 at 11:12 PM, Gleb Natapov<gleb@redhat.com> wrote:
>> KVM virtualizes guest memory by means of shadow pages or HW assistance
>> like NPT/EPT. Not all memory used by a guest is mapped into the guest
>> address space or even present in a host memory at any given time.
>> When vcpu tries to access memory page that is not mapped into the guest
>> address space KVM is notified about it. KVM maps the page into the guest
>> address space and resumes vcpu execution. If the page is swapped out
>> from host memory vcpu execution is suspended till the page is not swapped
>> into the memory again. This is inefficient since vcpu can do other work
>> (run other task or serve interrupts) while page gets swapped in.
>>
>> To overcome this inefficiency this patch series implements "asynchronous
>> page fault" for paravirtualized KVM guests. If a page that vcpu is
>> trying to access is swapped out KVM sends an async PF to the vcpu
>> and continues vcpu execution. Requested page is swapped in by another
>> thread in parallel. When vcpu gets async PF it puts faulted task to
>> sleep until "wake up" interrupt is delivered. When the page is brought
>> to the host memory KVM sends "wake up" interrupt and the guest's task
>> resumes execution.
>>
>
> Is it true that to make this work, we will need a (PV) kernel driver
> for each guest OS (Windows, Linux, ...)?
This patch series contains the guest kernel code for Linux,
as well as the host side code.
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next prev parent reply other threads:[~2010-01-05 16:00 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
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 [this message]
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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