From: Liu ping fan <kernelfans@gmail.com>
To: Alexander Graf <agraf@suse.de>
Cc: kvm-devel <kvm@vger.kernel.org>,
kvm-ppc <kvm-ppc@vger.kernel.org>,
Paul Mackerras <paulus@samba.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2] powernv: kvm: make _PAGE_NUMA take effect
Date: Thu, 3 Apr 2014 10:36:55 +0800 [thread overview]
Message-ID: <CAFgQCTs8LSXUi+AwxR9j+2-QRGw4EFZWx-JxktAnJ3VvwLJb9A@mail.gmail.com> (raw)
In-Reply-To: <C4D7ADEA-9CEB-4717-9AFD-CC8EFB18184A@suse.de>
Hi Alex, could you help to pick up this patch? since v3.14 kernel can
enable numa fault for powerpc.
Thx,
Fan
On Mon, Jan 27, 2014 at 5:11 PM, Alexander Graf <agraf@suse.de> wrote:
>
> On 21.01.2014, at 10:42, Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> wrote:
>
>> Liu Ping Fan <kernelfans@gmail.com> writes:
>>
>>> To make sure that on host, the pages marked with _PAGE_NUMA result in a fault
>>> when guest access them, we should force the checking when guest uses hypercall
>>> to setup hpte.
>>>
>>> Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
>>
>> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
>>
>> When we mark pte with _PAGE_NUMA we already call mmu_notifier_invalidate_range_start and
>> mmu_notifier_invalidate_range_end, which will mark existing guest hpte
>> entry as HPTE_V_ABSENT. Now we need to do that when we are inserting new
>> guest hpte entries. This patch does that.
>
> So what happens next? We insert a page into the HTAB without HPTE_V_VALID set, so the guest will fail to use it. If the guest does an H_READ on it it will suddenly turn to V_VALID though?
>
> I might need a crash course in the use of HPTE_V_ABSENT.
>
>
> Alex
>
next prev parent reply other threads:[~2014-04-03 2:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-21 8:15 [PATCH v2] powernv: kvm: make _PAGE_NUMA take effect Liu Ping Fan
2014-01-21 9:42 ` Aneesh Kumar K.V
2014-01-27 9:11 ` Alexander Graf
2014-01-27 10:28 ` Aneesh Kumar K.V
2014-01-27 10:42 ` Alexander Graf
2014-01-27 15:57 ` Aneesh Kumar K.V
2014-01-27 10:41 ` Paul Mackerras
2014-04-03 2:36 ` Liu ping fan [this message]
2014-04-03 11:36 ` Alexander Graf
2014-04-03 11:38 ` Alexander Graf
2014-04-03 11:43 ` Alexander Graf
2014-04-07 7:42 ` Aneesh Kumar K.V
2014-04-07 8:36 ` Alexander Graf
2014-04-10 3:28 ` Liu ping fan
2014-04-10 10:02 ` Alexander Graf
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