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

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Message-ID: <b22d5916-8b55-43bc-a256-2136d66ad25f@redhat.com>
Date: Thu, 16 Jan 2025 18:52:10 +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 1/14/25 4:52 PM, Marc Zyngier wrote:
> On Tue, 14 Jan 2025 14:57:43 +0000,
> Eric Auger <eauger@...hat.com> wrote:
>>
>> Hi Marc,
>>
>> On 1/14/25 3:38 PM, Marc Zyngier wrote:
>>> Hi Eric,
>>>
>>> On Tue, 14 Jan 2025 13:12:21 +0000,
>>> Eric Auger <eauger@...hat.com> wrote:
>>>>
>>>> I also confirm that using a mailine edk2 fixed the issues I faced
>>>> previously (fed/rhel L1 guest not booting).
>>>>
>>>> I used Marc's nv-next branch and qemu rebase.
>>>
>>> When did you sample this branch? It is almost daily rebased at the
>>> moment, given that we keep piling up things in kvmarm/next.
>> 5 days ago.
> 
> OK, so probably before I reapplied everything on top of kvmarm/next.
> Not necessarily a bad thing, just slightly older. The core NV code
> isn't rapidly changing anymore, with the exception of the recursive
> nesting stuff that I am currently rewriting.
> 
>>
>> If you want me to test a specific branch, please let me know, esp. in
>> the context of latest series including
>>
>> [PATCH v2 00/17] KVM: arm64: Add NV GICv3 support
> 
> That'd be the current nv-next then, which has all the series currently
> on the list, and a few more.
> 
>>>
>>>> With a rhel L1 guest I can now boot buildroot, debian and rhel guest as
>>>> L2 (feat mainline edk2). For rhel, I tested different kinds of page size
>>>> combinations for L1/L2 (4k and 64kB) and it worked.
>>>>
>>>> I tested on AmpereOne and Grace-Hopper systems
>>>
>>> Thanks for the confirmation. I haven't had a chance to try QEMU yet,
>>> but I expect that save/restore will not work. Something to look into,
>> I have not tested this yet.I will give it a try.
> 
> Thanks, that'd be super helpful.

I confirm the migration fails when putting some registers on the dest
side. I will further investigate.

Eric
> 
> 	M.
>