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

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Message-ID: <2f6b2cb1-3d32-480a-9801-9b993ae74e2d@os.amperecomputing.com>
Date: Thu, 19 Dec 2024 15:00:11 +0530
From: Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>
To: Eric Auger <eauger@...hat.com>, Marc Zyngier <maz@...nel.org>
Cc: 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



On 09-12-2024 11:04 pm, Eric Auger wrote:
> 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.

I could boot Guest-hypervisor using QEMU with -bios and nv-next as L0 
with edk2 (QEMU_EFI.fd) built from upstream tree and fedora-41 as 
Guest-Hypervisor.

The issue was disappeared when upgraded from fc39 to fc41. Same was 
experienced with the kvmtool boot as well(KVMTOOL_EFI.fd).

-- 
Thanks,
Ganapat/GK