From: Avi Kivity <avi@redhat.com>
To: Christoffer Dall <c.dall@virtualopensystems.com>
Cc: android-virt@lists.cs.columbia.edu, kvm@vger.kernel.org,
Andrea Arcangeli <aarcange@redhat.com>,
Marc Zyngier <marc.zyngier@arm.com>
Subject: Re: [PATCH v8 13/15] ARM: KVM: Handle guest faults in KVM
Date: Tue, 19 Jun 2012 12:32:06 +0300 [thread overview]
Message-ID: <4FE04716.6090202@redhat.com> (raw)
In-Reply-To: <CANM98qLg0y=xgoL_F_3UmQEpq02BBV8_aZq--KcVU=BFssY8qQ@mail.gmail.com>
On 06/19/2012 01:20 AM, Christoffer Dall wrote:
> On Mon, Jun 18, 2012 at 9:45 AM, Avi Kivity <avi@redhat.com> wrote:
>> On 06/15/2012 10:09 PM, Christoffer Dall wrote:
>>> From: Christoffer Dall <cdall@cs.columbia.edu>
>>>
>>> Handles the guest faults in KVM by mapping in corresponding user pages
>>> in the 2nd stage page tables.
>>>
>>> Introduces new ARM-specific kernel memory types, PAGE_KVM_GUEST and
>>> pgprot_guest variables used to map 2nd stage memory for KVM guests.
>>>
>>> Leverages MMU notifiers on KVM/ARM by supporting the kvm_unmap_hva() operation,
>>> where we remove the HVA from the 2nd stage translation. All other KVM MMU
>>> notifierhooks are NOPs.
>>
>> I think you must at least support change_pte (possibly by unmapping).
>> Andrea?
>>
> hmmm, at least for KSM support we need to support change_pte (are
> there other callers for this type of memory?)
>
> It's not trivial I guess, since we would need to support COW and
> thereby stage-2 permission faults... Marc, right?
As I mentioned, you can support change_pte by unmapping. This will
cause ksm to be ineffective (pages will only be shared if the guest
doesn't touch them at all), but it's enough to get started.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-06-19 9:32 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-15 19:06 [PATCH v8 00/15] KVM/ARM Implementation Christoffer Dall
2012-06-15 19:06 ` [PATCH v8 01/15] ARM: add mem_type prot_pte accessor Christoffer Dall
2012-06-15 19:07 ` [PATCH v8 02/15] KVM: use KVM_CAP_IRQ_ROUTING to protect the routing related code Christoffer Dall
2012-06-18 13:06 ` Avi Kivity
2012-06-15 19:07 ` [PATCH v8 03/15] KVM: Introduce __KVM_HAVE_IRQ_LINE Christoffer Dall
2012-06-18 13:07 ` Avi Kivity
2012-06-15 19:07 ` [PATCH v8 04/15] KVM: Guard mmu_notifier specific code with CONFIG_MMU_NOTIFIER Christoffer Dall
2012-06-18 13:08 ` Avi Kivity
2012-06-18 17:47 ` Christoffer Dall
2012-06-19 8:37 ` Avi Kivity
2012-06-28 21:28 ` Marcelo Tosatti
2012-06-15 19:07 ` [PATCH v8 05/15] ARM: KVM: Initial skeleton to compile KVM support Christoffer Dall
2012-06-15 19:07 ` [PATCH v8 06/15] ARM: KVM: Hypervisor identity mapping Christoffer Dall
2012-06-18 13:12 ` Avi Kivity
2012-06-18 17:55 ` Christoffer Dall
2012-06-19 8:38 ` Avi Kivity
2012-06-15 19:07 ` [PATCH v8 07/15] ARM: KVM: Hypervisor inititalization Christoffer Dall
2012-06-28 22:35 ` Marcelo Tosatti
2012-06-28 22:53 ` Christoffer Dall
2012-06-29 1:07 ` Marcelo Tosatti
2012-06-15 19:08 ` [PATCH v8 08/15] ARM: KVM: Module unloading support Christoffer Dall
2012-06-15 19:08 ` [PATCH v8 09/15] ARM: KVM: Memory virtualization setup Christoffer Dall
2012-06-21 12:29 ` Gleb Natapov
2012-06-21 19:48 ` Christoffer Dall
2012-06-28 22:34 ` Marcelo Tosatti
2012-06-28 22:51 ` Christoffer Dall
2012-06-15 19:08 ` [PATCH v8 10/15] ARM: KVM: Inject IRQs and FIQs from userspace Christoffer Dall
2012-06-18 13:32 ` Avi Kivity
2012-06-18 20:56 ` Christoffer Dall
2012-06-19 8:49 ` Avi Kivity
2012-06-20 3:17 ` Christoffer Dall
2012-06-15 19:08 ` [PATCH v8 11/15] ARM: KVM: World-switch implementation Christoffer Dall
2012-06-18 13:41 ` Avi Kivity
2012-06-18 22:05 ` Christoffer Dall
2012-06-19 9:16 ` Avi Kivity
2012-06-20 3:27 ` Christoffer Dall
2012-06-20 4:40 ` Christoffer Dall
2012-06-21 8:13 ` Avi Kivity
2012-06-21 17:54 ` Christoffer Dall
2012-07-02 13:07 ` Avi Kivity
2012-06-15 19:08 ` [PATCH v8 12/15] ARM: KVM: Emulation framework and CP15 emulation Christoffer Dall
2012-06-15 19:09 ` [PATCH v8 13/15] ARM: KVM: Handle guest faults in KVM Christoffer Dall
2012-06-18 13:45 ` Avi Kivity
2012-06-18 22:20 ` Christoffer Dall
2012-06-19 9:32 ` Avi Kivity [this message]
2012-06-19 10:41 ` Andrea Arcangeli
2012-06-20 15:13 ` Christoffer Dall
2012-06-20 17:49 ` Andrea Arcangeli
2012-06-15 19:09 ` [PATCH v8 14/15] ARM: KVM: Handle I/O aborts Christoffer Dall
2012-06-18 13:48 ` Avi Kivity
2012-06-18 22:28 ` Christoffer Dall
2012-06-15 19:09 ` [PATCH v8 15/15] ARM: KVM: Guest wait-for-interrupts (WFI) support Christoffer Dall
2012-06-28 21:49 ` [PATCH v8 00/15] KVM/ARM Implementation Marcelo Tosatti
2012-06-28 22:44 ` Christoffer Dall
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