linux-kernel - Re: [PATCH] arm64: kvm: Make nvhe stack size configurable

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Message-ID: <CAC_TJve8tuBpoeTjwg5=PKFhFaD=M5nwxeJsHeYP1ZezMd_Wug@mail.gmail.com>
Date: Mon, 11 Nov 2024 16:52:17 -0800
From: Kalesh Singh <kaleshsingh@...gle.com>
To: Marc Zyngier <maz@...nel.org>
Cc: will@...nel.org, qperret@...gle.com, broonie@...nel.org, 
	mark.rutland@....com, keir@...gle.com, vdonnefort@...gle.com, 
	kernel-team@...roid.com, android-mm@...gle.com, 
	Catalin Marinas <catalin.marinas@....com>, Oliver Upton <oliver.upton@...ux.dev>, 
	Joey Gouly <joey.gouly@....com>, Suzuki K Poulose <suzuki.poulose@....com>, 
	Zenghui Yu <yuzenghui@...wei.com>, Ard Biesheuvel <ardb@...nel.org>, 
	D Scott Phillips <scott@...amperecomputing.com>, Andrey Konovalov <andreyknvl@...il.com>, 
	Ankit Agrawal <ankita@...dia.com>, Wang Jinchao <wangjinchao@...sion.com>, 
	"Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>, Pierre-Clément Tosi <ptosi@...gle.com>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Ryan Roberts <ryan.roberts@....com>, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	kvmarm@...ts.linux.dev
Subject: Re: [PATCH] arm64: kvm: Make nvhe stack size configurable

On Mon, Nov 11, 2024 at 9:52 AM Marc Zyngier <maz@...nel.org> wrote:
>
> Hi Kalesh,
>
> On Mon, 11 Nov 2024 17:10:18 +0000,
> Kalesh Singh <kaleshsingh@...gle.com> wrote:
> >
> > I tried to be conservative with the configuration only allowing only
> > up to 2 pages. Your points are fair concerns, I can see how this still
> > may not be ideal for upstream. However, I think introducing
> > NVHE_STACK_SIZE as a refactor still has value, similar to how
> > OVERFLOW_STACK_SIZE is handled. If there are no objections, I’ll
> > resend a v2 of the patch, dropping the configuration parts and
> > focusing on the refactor to introduce NVHE_STACK_SIZE.
>
> I'd be OK with the refactoring on its own, which is a nice enough
> cleanup.

Posted v2 at: https://lore.kernel.org/r/20241112003336.1375584-1-kaleshsingh@google.com/

Thanks,
Kalesh

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