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

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Message-ID: <86zfl4svkc.wl-maz@kernel.org>
Date: Mon, 09 Dec 2024 15:52:19 +0000
From: Marc Zyngier <maz@...nel.org>
To: Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>
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 Mon, 09 Dec 2024 15:39:28 +0000,
Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com> 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.

Works nicely here with kvmtool as the VMM. From what I understand,
EDK2 needs some surgery to correctly boot at EL2 without FEAT_E2H0.

> We do have the FEAT_ECV on AmpereOne, I was the one reported/fixed bug
> with FEAT_ECV(CNTPOFF offset issue) in the past.

Sorry, I don't keep track of the feature set for machines I don't have
access to.

	M.

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