linux-kernel - Re: [PATCH] KVM: arm64: nv: Set ISTATUS for emulated timers, If timer expired

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Message-ID: <4d443db1-85b1-4071-acd5-3187deb9cb17@redhat.com>
Date: Mon, 9 Dec 2024 18:34:18 +0100
From: Eric Auger <eauger@...hat.com>
To: Marc Zyngier <maz@...nel.org>
Cc: Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
 kvmarm <kvmarm@...ts.linux.dev>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, oliver.upton@...ux.dev,
 christoffer.dall@....com, suzuki.poulose@....com, will@...nel.org,
 catalin.marinas@....com, coltonlewis@...gle.com, joey.gouly@....com,
 yuzenghui@...wei.com, darren@...amperecomputing.com,
 vishnu@...amperecomputing.com
Subject: Re: [PATCH] KVM: arm64: nv: Set ISTATUS for emulated timers, If timer
 expired

Hi Marc,

On 12/9/24 18:30, Marc Zyngier wrote:
> On Mon, 09 Dec 2024 16:46:30 +0000,
> Eric Auger <eauger@...hat.com> wrote:
>>
>> Hi,
>>
>> On 12/9/24 16:39, Ganapatrao Kulkarni wrote:
>>>
>>>
>>> On 09-12-2024 06:50 pm, Marc Zyngier wrote:
>>>> On Mon, 09 Dec 2024 12:25:34 +0000,
>>>> Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com> wrote:
>>>>>>>
>>>>>>> During automated testing of Nested Virtualization using avocado-vt,
>>>>>>
>>>>>> Which is not merged upstream. So what branch are you using? Based on
>>>>>> what kernel version? On what HW? With which virtualisation features?
>>>>>>
>>>>>
>>>>> Testing is done on Ampere's AmpereOne platform using 6.10 based kernel
>>>>> with NV patches from your repo.
>>>>
>>>> Grmbl... *Which* patches? At least give me the SHA1 of the branch,
>>>> because I have no idea what you are running. And 6.10 is definitely
>>>> not something I care about. If you're using the NV patches, the
>>>> *minimum* you should run is 6.13-rc1, because that's what the current
>>>> code is based on.
>>>>
>>>
>>> I tried 6.13-rc1 based nv-next branch today, which failed to boot
>>> UEFI as L1. Yet to debug this.
>>
>> I confirm am stuck with the same issue with nv-next on AmpereOne.
> 
> All I can say is that it Works For Me (TM) on M2 and Snapdragon, using
> kvmtool, a fresh EDK2 built by Ard, and with the guest running purely
> VHE (FEAT_E2H0 not implemented).
> 
> I haven't tried QEMU, I don't have an AmpereOne. I have also spent way
> too much time on this recently. So I'm afraid people interested in
> making this particular combination work will have to debug it.

yes I do agree. I am currently setting up kvmtool to double check and I
will debug the qemu issue.

Thanks

Eric
> 
> 	M.
>