From: Avi Kivity <avi@qumranet.com>
To: Anthony Liguori <aliguori@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
kvm-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: [kvm-devel] [PATCH 6/13] KVM: memory slot management
Date: Sun, 29 Oct 2006 11:15:59 +0200 [thread overview]
Message-ID: <4544714F.7070203@qumranet.com> (raw)
In-Reply-To: <4542292C.3080409@us.ibm.com>
Anthony Liguori wrote:
>>
>> It's not about tlb entries. The shadow page tables collaples a GV ->
>> HV -> HP double translation into a GV -> HP page table. When the
>> Linux vm goes around evicting pages, it invalidates those mappings.
>>
>> There are two solutions possible: lock pages which participate in
>> these translations (and their number can be large) or modify the
>> Linux vm to consult a reverse mapping and remove the translations (in
>> which case TLB entries need to be removed).
>>
>
> If you locked pages that have active shadow mappings, you could then
> use a secondary mechanism to invalidate existing mappings when necessary.
>
Yes.
There are two needs: to propagate virtual machine activity to the host
(by folding dirty and accessed bits from multiple shadow ptes into a
single struct page), and to apply pressure from the vm to the guest (by
invalidating all mappings of a given page).
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 6/13] KVM: memory slot management
Date: Sun, 29 Oct 2006 11:15:59 +0200 [thread overview]
Message-ID: <4544714F.7070203@qumranet.com> (raw)
In-Reply-To: <4542292C.3080409-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Anthony Liguori wrote:
>>
>> It's not about tlb entries. The shadow page tables collaples a GV ->
>> HV -> HP double translation into a GV -> HP page table. When the
>> Linux vm goes around evicting pages, it invalidates those mappings.
>>
>> There are two solutions possible: lock pages which participate in
>> these translations (and their number can be large) or modify the
>> Linux vm to consult a reverse mapping and remove the translations (in
>> which case TLB entries need to be removed).
>>
>
> If you locked pages that have active shadow mappings, you could then
> use a secondary mechanism to invalidate existing mappings when necessary.
>
Yes.
There are two needs: to propagate virtual machine activity to the host
(by folding dirty and accessed bits from multiple shadow ptes into a
single struct page), and to apply pressure from the vm to the guest (by
invalidating all mappings of a given page).
--
error compiling committee.c: too many arguments to function
-------------------------------------------------------------------------
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next prev parent reply other threads:[~2006-10-29 9:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-26 17:19 [PATCH 0/13] KVM: Kernel-based Virtual Machine (v3) Avi Kivity
2006-10-26 17:22 ` [PATCH 1/13] KVM: userspace interface Avi Kivity
[not found] ` <200610270051.43477.arnd@arndb.de>
2006-10-27 5:51 ` Avi Kivity
2006-10-26 17:23 ` [PATCH 2/13] KVM: Intel virtual mode extensions definitions Avi Kivity
2006-10-26 17:24 ` [PATCH 3/13] KVM: kvm data structures Avi Kivity
2006-10-26 22:55 ` Arnd Bergmann
2006-10-27 5:53 ` Avi Kivity
2006-10-27 7:39 ` Arnd Bergmann
2006-10-26 17:25 ` [PATCH 4/13] KVM: random accessors and constants Avi Kivity
2006-10-26 17:26 ` [PATCH 5/13] KVM: virtualization infrastructure Avi Kivity
2006-10-26 17:27 ` [PATCH 6/13] KVM: memory slot management Avi Kivity
2006-10-26 22:44 ` Arnd Bergmann
2006-10-27 5:47 ` Avi Kivity
2006-10-27 7:37 ` Arnd Bergmann
2006-10-27 13:26 ` Avi Kivity
2006-10-27 14:05 ` Arnd Bergmann
2006-10-29 9:10 ` Avi Kivity
2006-10-29 9:10 ` Avi Kivity
2006-10-27 15:43 ` [kvm-devel] " Anthony Liguori
2006-10-29 9:15 ` Avi Kivity [this message]
2006-10-29 9:15 ` Avi Kivity
2006-10-26 17:28 ` [PATCH 7/13] KVM: vcpu creation and maintenance Avi Kivity
2006-10-26 17:29 ` [PATCH 8/13] KVM: vcpu execution loop Avi Kivity
2006-10-26 17:30 ` [PATCH 9/13] KVM: define exit handlers Avi Kivity
2006-10-26 17:31 ` [PATCH 10/13] KVM: less common " Avi Kivity
2006-10-26 17:32 ` [PATCH 11/13] KVM: mmu Avi Kivity
2006-10-26 17:33 ` [PATCH 12/13] KVM: x86 emulator Avi Kivity
2006-10-26 17:34 ` [PATCH 13/13] KVM: plumbing Avi Kivity
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