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From: Ard Biesheuvel <ardb@kernel.org>
To: Steven Price <steven.price@arm.com>
Cc: "Mark Rutland" <Mark.Rutland@arm.com>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Catalin Marinas" <Catalin.Marinas@arm.com>,
	"Dave Hansen" <dave.hansen@linux.intel.com>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>,
	"Andy Lutomirski" <luto@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"James Morse" <James.Morse@arm.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Will Deacon" <will@kernel.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	"Liang, Kan" <kan.liang@linux.intel.com>
Subject: Re: [PATCH v17 21/23] arm64: mm: Convert mm/dump.c to use walk_page_range()
Date: Mon, 17 Feb 2020 11:16:23 +0100
Message-ID: <CAKv+Gu-iLwjZvavQud9o+5nTB0ORAAn32qKMScxYHJ64k7HExA@mail.gmail.com> (raw)
In-Reply-To: <ee4f53ec-601b-3698-1479-f7aeaada38ad@arm.com>

On Mon, 17 Feb 2020 at 11:01, Steven Price <steven.price@arm.com> wrote:
>
> On 16/02/2020 16:25, Ard Biesheuvel wrote:
> > On Wed, 18 Dec 2019 at 17:25, Steven Price <steven.price@arm.com> wrote:
> >>
> >> Now walk_page_range() can walk kernel page tables, we can switch the
> >> arm64 ptdump code over to using it, simplifying the code.
> >>
> >> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
> >> Signed-off-by: Steven Price <steven.price@arm.com>
> >
> > I did not realize this at the time, but this patch removes the ability
> > to dump the EFI page tables on 32-bit ARM. Was that intentional?
>
> No that wasn't intentional, but I can't instantly see how this change
> affects 32-bit ARM.
>
> <snip (files in arch/arm64)>
> >> diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
> >> index 899b803842bb..9dda2602c862 100644
> >> --- a/drivers/firmware/efi/arm-runtime.c
> >> +++ b/drivers/firmware/efi/arm-runtime.c
> >> @@ -27,7 +27,7 @@
> >>
> >>  extern u64 efi_system_table;
> >>
> >> -#ifdef CONFIG_ARM64_PTDUMP_DEBUGFS
> >> +#if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64)
>
> The previous define was *ARM64* so should never have been true when
> building for arm. The new condition should be equivalent (arm64 &&
> ptdump enabled).
>
> Am I missing something?
>

Not at all, I just got confused.

IIRC we did have support for dumping the EFI pages tables on 32-bit
ARM at *some* point, but it obviously wasn't your patch that removed
it.

Apologies for the noise.

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  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-18 16:23 [PATCH v17 00/23] Generic page walk and ptdump Steven Price
2019-12-18 16:23 ` [PATCH v17 01/23] mm: Add generic p?d_leaf() macros Steven Price
2019-12-19 11:43   ` Michael Ellerman
2019-12-20 11:48     ` Steven Price
2019-12-21 10:35       ` Michael Ellerman
2019-12-18 16:23 ` [PATCH v17 02/23] arc: mm: Add p?d_leaf() definitions Steven Price
2019-12-18 16:23 ` [PATCH v17 03/23] arm: " Steven Price
2019-12-18 16:23 ` [PATCH v17 04/23] arm64: " Steven Price
2019-12-18 16:23 ` [PATCH v17 05/23] mips: " Steven Price
2019-12-18 16:23 ` [PATCH v17 06/23] powerpc: " Steven Price
2019-12-19 11:49   ` Michael Ellerman
2019-12-20 11:53     ` Steven Price
2019-12-18 16:23 ` [PATCH v17 07/23] riscv: " Steven Price
2019-12-18 16:23 ` [PATCH v17 08/23] s390: " Steven Price
2019-12-18 16:23 ` [PATCH v17 09/23] sparc: " Steven Price
2019-12-18 16:23 ` [PATCH v17 10/23] x86: " Steven Price
2019-12-18 16:23 ` [PATCH v17 11/23] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-12-19 14:25   ` Thomas Hellström (VMware)
2019-12-20 15:35     ` Steven Price
2019-12-18 16:23 ` [PATCH v17 12/23] mm: pagewalk: Allow walking without vma Steven Price
2019-12-18 16:23 ` [PATCH v17 13/23] mm: pagewalk: Don't lock PTEs for walk_page_range_novma() Steven Price
2019-12-18 16:23 ` [PATCH v17 14/23] mm: pagewalk: fix termination condition in walk_pte_range() Steven Price
2019-12-18 16:23 ` [PATCH v17 15/23] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price
2019-12-18 16:23 ` [PATCH v17 16/23] x86: mm: Point to struct seq_file from struct pg_state Steven Price
2019-12-18 16:23 ` [PATCH v17 17/23] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-12-18 16:23 ` [PATCH v17 18/23] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price
2019-12-18 16:23 ` [PATCH v17 19/23] mm: Add generic ptdump Steven Price
2019-12-18 16:23 ` [PATCH v17 20/23] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price
2019-12-18 16:24 ` [PATCH v17 21/23] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2020-02-16 16:25   ` Ard Biesheuvel
2020-02-17 10:01     ` Steven Price
2020-02-17 10:16       ` Ard Biesheuvel [this message]
2019-12-18 16:24 ` [PATCH v17 22/23] arm64: mm: Display non-present entries in ptdump Steven Price
2019-12-18 16:24 ` [PATCH v17 23/23] mm: ptdump: Reduce level numbers by 1 in note_page() Steven Price

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