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 Mon, 17 May 2021 11:42:45 +0200 (CEST)
Subject: Re: [FSL P50x0] KVM HV doesn't work anymore
To: Nicholas Piggin <npiggin@gmail.com>,
 Christophe Leroy <christophe.leroy@csgroup.eu>,
 "kvm-ppc@vger.kernel.org" <kvm-ppc@vger.kernel.org>,
 linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
References: <04526309-4653-3349-b6de-e7640c2258d6@xenosoft.de>
 <34617b1b-e213-668b-05f6-6fce7b549bf0@xenosoft.de>
 <9af2c1c9-2caf-120b-2f97-c7722274eee3@csgroup.eu>
 <199da427-9511-34fe-1a9e-08e24995ea85@xenosoft.de>
 <1621236734.xfc1uw04eb.astroid@bobo.none>
From: Christian Zigotzky <chzigotzky@xenosoft.de>
Message-ID: <e6ed7674-3df9-ec3e-8bcf-dcd8ff0fecf8@xenosoft.de>
Date: Mon, 17 May 2021 11:42:45 +0200
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Cc: Darren Stevens <darren@stevens-zone.net>, "R.T.Dickinson" <rtd2@xtra.co.nz>,
 mad skateman <madskateman@gmail.com>, Christian Zigotzky <info@xenosoft.de>
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On 17 May 2021 at 09:42am, Nicholas Piggin wrote:
> Excerpts from Christian Zigotzky's message of May 15, 2021 11:46 pm:
>> On 15 May 2021 at 12:08pm Christophe Leroy wrote:
>>>
>>> Le 15/05/2021 à 11:48, Christian Zigotzky a écrit :
>>>> Hi All,
>>>>
>>>> I bisected today [1] and the bisecting itself was OK but the
>>>> reverting of the bad commit doesn't solve the issue. Do you have an
>>>> idea which commit could be resposible for this issue? Maybe the
>>>> bisecting wasn't successful. I will look in the kernel git log. Maybe
>>>> there is a commit that affected KVM HV on FSL P50x0 machines.
>>> If the uImage doesn't load, it may be because of the size of uImage.
>>>
>>> See https://github.com/linuxppc/issues/issues/208
>>>
>>> Is there a significant size difference with and without KVM HV ?
>>>
>>> Maybe you can try to remove another option to reduce the size of the
>>> uImage.
>> I tried it but it doesn't solve the issue. The uImage works without KVM
>> HV in a virtual e5500 QEMU machine.
> Any more progress with this? I would say that bisect might have just
> been a bit unstable and maybe by chance some things did not crash so
> it's pointing to the wrong patch.
>
> Upstream merge of powerpc-5.13-1 was good and powerpc-5.13-2 was bad?
>
> Between that looks like some KVM MMU rework. You could try the patch
> before this one b1c5356e873c ("KVM: PPC: Convert to the gfn-based MMU
> notifier callbacks"). That won't revert cleanly so just try run the
> tree at that point. If it works, test the patch and see if it fails.
>
> Thanks,
> Nick
Hi Nick,

Thanks a lot for your answer. Yes, there is a little bit of progress. 
The RC2 of kernel 5.13 successfully boots with -smp 3 in a virtual e5500 
QEMU machine.
-smp 4 doesn't work anymore since the PowerPC updates 5.13-2. I used 
-smp 4 before 5.13 because my FSL P5040 machine has 4 cores.

Could you please post a patch for reverting the commit before 
b1c5356e873c ("KVM: PPC: Convert to the gfn-based MMU notifier callbacks")?

Thanks in advance,

Christian



From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Zigotzky <chzigotzky@xenosoft.de>
Date: Mon, 17 May 2021 09:42:45 +0000
Subject: Re: [FSL P50x0] KVM HV doesn't work anymore
Message-Id: <e6ed7674-3df9-ec3e-8bcf-dcd8ff0fecf8@xenosoft.de>
List-Id: <kvm-ppc.vger.kernel.org>
References: <04526309-4653-3349-b6de-e7640c2258d6@xenosoft.de>
 <34617b1b-e213-668b-05f6-6fce7b549bf0@xenosoft.de>
 <9af2c1c9-2caf-120b-2f97-c7722274eee3@csgroup.eu>
 <199da427-9511-34fe-1a9e-08e24995ea85@xenosoft.de>
 <1621236734.xfc1uw04eb.astroid@bobo.none>
In-Reply-To: <1621236734.xfc1uw04eb.astroid@bobo.none>
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
To: Nicholas Piggin <npiggin@gmail.com>, Christophe Leroy <christophe.leroy@csgroup.eu>, "kvm-ppc@vger.kernel.org" <kvm-ppc@vger.kernel.org>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Cc: Darren Stevens <darren@stevens-zone.net>, "R.T.Dickinson" <rtd2@xtra.co.nz>, mad skateman <madskateman@gmail.com>, Christian Zigotzky <info@xenosoft.de>

On 17 May 2021 at 09:42am, Nicholas Piggin wrote:
> Excerpts from Christian Zigotzky's message of May 15, 2021 11:46 pm:
>> On 15 May 2021 at 12:08pm Christophe Leroy wrote:
>>>
>>> Le 15/05/2021 à 11:48, Christian Zigotzky a écrit :
>>>> Hi All,
>>>>
>>>> I bisected today [1] and the bisecting itself was OK but the
>>>> reverting of the bad commit doesn't solve the issue. Do you have an
>>>> idea which commit could be resposible for this issue? Maybe the
>>>> bisecting wasn't successful. I will look in the kernel git log. Maybe
>>>> there is a commit that affected KVM HV on FSL P50x0 machines.
>>> If the uImage doesn't load, it may be because of the size of uImage.
>>>
>>> See https://github.com/linuxppc/issues/issues/208
>>>
>>> Is there a significant size difference with and without KVM HV ?
>>>
>>> Maybe you can try to remove another option to reduce the size of the
>>> uImage.
>> I tried it but it doesn't solve the issue. The uImage works without KVM
>> HV in a virtual e5500 QEMU machine.
> Any more progress with this? I would say that bisect might have just
> been a bit unstable and maybe by chance some things did not crash so
> it's pointing to the wrong patch.
>
> Upstream merge of powerpc-5.13-1 was good and powerpc-5.13-2 was bad?
>
> Between that looks like some KVM MMU rework. You could try the patch
> before this one b1c5356e873c ("KVM: PPC: Convert to the gfn-based MMU
> notifier callbacks"). That won't revert cleanly so just try run the
> tree at that point. If it works, test the patch and see if it fails.
>
> Thanks,
> Nick
Hi Nick,

Thanks a lot for your answer. Yes, there is a little bit of progress. 
The RC2 of kernel 5.13 successfully boots with -smp 3 in a virtual e5500 
QEMU machine.
-smp 4 doesn't work anymore since the PowerPC updates 5.13-2. I used 
-smp 4 before 5.13 because my FSL P5040 machine has 4 cores.

Could you please post a patch for reverting the commit before 
b1c5356e873c ("KVM: PPC: Convert to the gfn-based MMU notifier callbacks")?

Thanks in advance,

Christian