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

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Message-ID: <86cygpwfy0.wl-maz@kernel.org>
Date: Tue, 14 Jan 2025 15:52:39 +0000
From: Marc Zyngier <maz@...nel.org>
To: Eric Auger <eauger@...hat.com>
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

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.

	M.

-- 
Without deviation from the norm, progress is not possible.