linux-kernel - Re: [PATCH 05/28] arm64: vdso: Use only one single vvar mapping

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Message-ID: <20241028183937.GA3132@willie-the-truck>
Date: Mon, 28 Oct 2024 18:39:38 +0000
From: Will Deacon <will@...nel.org>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Guo Ren <guoren@...nel.org>, Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Russell King <linux@...linux.org.uk>,
	Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>, Theodore Ts'o <tytso@....edu>,
	"Jason A. Donenfeld" <Jason@...c4.com>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	linux-csky@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org, loongarch@...ts.linux.dev,
	linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 05/28] arm64: vdso: Use only one single vvar mapping

On Thu, Oct 10, 2024 at 09:01:07AM +0200, Thomas Weißschuh wrote:
> The vvar mapping is the same for all processes. Use a single mapping to
> simplify the logic and align it with the other architectures.
> 
> In addition this will enable the move of the vvar handling into generic code.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
> ---
>  arch/arm64/kernel/vdso.c | 43 +++++++++++++------------------------------
>  1 file changed, 13 insertions(+), 30 deletions(-)

I took this for a spin in qemu to double-check that compat and native
tasks can peacefully co-exist while using the vDSO. It all seems ok, so:

Acked-by: Will Deacon <will@...nel.org>
Tested-by: Will Deacon <will@...nel.org>

Will