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

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Message-ID: <86y10osr19.wl-maz@kernel.org>
Date: Mon, 09 Dec 2024 17:30:10 +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 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.

	M.

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