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From: Ard Biesheuvel <ardb@kernel.org>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linux-hardening@vger.kernel.org,
	 Nicolas Pitre <nico@fluxnic.net>, Arnd Bergmann <arnd@arndb.de>,
	Kees Cook <keescook@chromium.org>,
	 Keith Packard <keithpac@amazon.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	 Nick Desaulniers <ndesaulniers@google.com>,
	Tony Lindgren <tony@atomide.com>,  Marc Zyngier <maz@kernel.org>,
	Vladimir Murzin <vladimir.murzin@arm.com>,
	 Jesse Taube <mr.bossman075@gmail.com>
Subject: Re: [PATCH v5 00/32] ARM vmap'ed and IRQ stacks roundup
Date: Mon, 24 Jan 2022 18:57:52 +0100	[thread overview]
Message-ID: <CAMj1kXErsMZr61+NxPrGRxGk0th7sAzCDRMwGcnf08GK7-7OOw@mail.gmail.com> (raw)
In-Reply-To: <Ye7oabF/ewS0pSKw@shell.armlinux.org.uk>

On Mon, 24 Jan 2022 at 18:57, Russell King (Oracle)
<linux@armlinux.org.uk> wrote:
>
> On Mon, Jan 24, 2022 at 06:47:12PM +0100, Ard Biesheuvel wrote:
> > This v5 series is a combined followup to
> >
> > - IRQ stacks support for v7 SMP systems [0],
> > - vmap'ed stacks support for v7 SMP systems[1],
> > - extending support for both IRQ stacks and vmap'ed stacks for all
> >   remaining configurations, including v6/v7 SMP multiplatform kernels
> >   and uniprocessor configurations including v7-M [2]
> >
> > [0] https://lore.kernel.org/linux-arm-kernel/20211115084732.3704393-1-ardb@kernel.org/
> > [1] https://lore.kernel.org/linux-arm-kernel/20211122092816.2865873-1-ardb@kernel.org/
> > [2] https://lore.kernel.org/linux-arm-kernel/20211206164659.1495084-1-ardb@kernel.org/
> >
> > This work was queued up in the ARM tree for a while, but due to problems
> > with the vmap'ed stacks code, which was difficult to revert in
> > isolation, the whole stack was dropped again.
> >
> > In order to prevent similar problems from occurring this time around,
> > the series was reorganized so that the vmap'ed stacks changes appear at
> > the very end, which also results in a more natural progression of the
> > changes.
> >
> > Changes since v4:
> > - incorporate fixups to avoid build failures on Clang related to
> >   literals in subsections,
> > - switch from the ID map to swapper_pg_dir as early as possible when
> >   onlining a CPU on !LPAE, to ensure that the stack is mapped,
> > - use SMP_ON_UP patching to elide HWCAP_TLS tests on SMP+v6,
> > - clean up __switch_to() for Thumb2 a bit more,
> > - add patch to make the vmalloc_seq counter SMP safe,
> > - use enter_lazy_tlb() hook on !LPAE to ensure that the active_mm used
> >   by a kernel thread has a mapping for its vmap'ed stack,
>
> Hi Ard,
>
> I still have the original code in devel-stable, and being a guaranteed
> stable branch, it's not something I'll be dropping... Please can I have
> fixes on top of what is already there please?
>

Sure.

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      reply	other threads:[~2022-01-24 18:23 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-24 17:47 [PATCH v5 00/32] ARM vmap'ed and IRQ stacks roundup Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 01/32] ARM: riscpc: drop support for IOMD_IRQREQC/IOMD_IRQREQD IRQ groups Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 02/32] ARM: riscpc: use GENERIC_IRQ_MULTI_HANDLER Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 03/32] ARM: footbridge: " Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 04/32] ARM: iop32x: offset IRQ numbers by 1 Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 05/32] ARM: iop32x: use GENERIC_IRQ_MULTI_HANDLER Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 06/32] ARM: remove old-style irq entry Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 07/32] irqchip: nvic: Use GENERIC_IRQ_MULTI_HANDLER Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 08/32] ARM: decompressor: disable stack protector Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 09/32] ARM: stackprotector: prefer compiler for TLS based per-task protector Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 10/32] ARM: entry: preserve thread_info pointer in switch_to Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 11/32] ARM: module: implement support for PC-relative group relocations Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 12/32] ARM: assembler: add optimized ldr/str macros to load variables from memory Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 13/32] ARM: percpu: add SMP_ON_UP support Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 14/32] ARM: use TLS register for 'current' on !SMP as well Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 15/32] ARM: smp: defer TPIDRURO update for SMP v6 configurations too Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 16/32] ARM: implement THREAD_INFO_IN_TASK for uniprocessor systems Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 17/32] ARM: assembler: introduce bl_r macro Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 18/32] ARM: unwind: support unwinding across multiple stacks Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 19/32] ARM: export dump_mem() to other objects Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 20/32] ARM: unwind: dump exception stack from calling frame Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 21/32] ARM: backtrace-clang: avoid crash on bogus frame pointer Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 22/32] ARM: implement IRQ stacks Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 23/32] ARM: call_with_stack: add unwind support Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 24/32] ARM: run softirqs on the per-CPU IRQ stack Ard Biesheuvel
2022-03-22  9:04   ` Sebastian Andrzej Siewior
2022-03-22  9:35     ` Ard Biesheuvel
2022-03-22 11:29       ` Sebastian Andrzej Siewior
2022-01-24 17:47 ` [PATCH v5 25/32] ARM: memcpy: use frame pointer as unwind anchor Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 26/32] ARM: memmove: " Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 27/32] ARM: memset: clean up unwind annotations Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 28/32] ARM: unwind: disregard unwind info before stack frame is set up Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 29/32] ARM: entry: rework stack realignment code in svc_entry Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 30/32] ARM: switch_to: clean up Thumb2 code path Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 31/32] ARM: mm: prepare vmalloc_seq handling for use under SMP Ard Biesheuvel
2022-01-24 17:47 ` [PATCH v5 32/32] ARM: implement support for vmap'ed stacks Ard Biesheuvel
2022-01-24 17:56 ` [PATCH v5 00/32] ARM vmap'ed and IRQ stacks roundup Russell King (Oracle)
2022-01-24 17:57   ` Ard Biesheuvel [this message]

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