From: Ard Biesheuvel <ardb@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com,
Anshuman Khandual <anshuman.khandual@arm.com>,
will@kernel.org, Ard Biesheuvel <ardb@kernel.org>,
Steve Capper <steve.capper@arm.com>
Subject: [PATCH v2 0/4] arm64: mm: optimize VA space organization for 52-bit
Date: Thu, 8 Oct 2020 17:35:58 +0200 [thread overview]
Message-ID: <20201008153602.9467-1-ardb@kernel.org> (raw)
This series reorganizes the kernel VA space slightly so that 52-bit VA
configurations can use more virtual address space, i.e., the usable
linear address space almost doubles, from 2^51 to 2^52-2^47.
Patch #1 merges the physvirt_offset and memstart_addr variables, both of
which represent translations between the physical address space and the
linear region, and there is no need for having both. This fixes a bug too,
as the two values were not properly kept in sync when booting with KASLR
enabled.
Patch #2 updates the definitions for the boundaries of the linear space,
so that 52-bit VA builds use all available space for the linear region.
Patches #3 and #4 simplify the way the vmemmap region is configured, and
unify the 48-bit/4k and 52-bit/64k layouts.
Changes since v1:
- drop incorrect use of untagged_addr() from #2
- add patches #3 and #4
Not boot tested yet on a 52-bit VA capable system.
Cc: Steve Capper <steve.capper@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Ard Biesheuvel (4):
arm64: mm: use single quantity to represent the PA to VA translation
arm64: mm: extend linear region for 52-bit VA configurations
arm64: mm: make vmemmap region a projection of the linear region
arm64: mm: tidy up top of kernel VA space
Documentation/arm64/kasan-offsets.sh | 3 +-
Documentation/arm64/memory.rst | 45 +++++++++-----------
arch/arm64/Kconfig | 20 ++++-----
arch/arm64/include/asm/memory.h | 35 +++++++--------
arch/arm64/include/asm/pgtable.h | 6 +--
arch/arm64/mm/init.c | 34 ++++++---------
6 files changed, 63 insertions(+), 80 deletions(-)
--
2.17.1
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next reply other threads:[~2020-10-08 15:37 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-08 15:35 Ard Biesheuvel [this message]
2020-10-08 15:35 ` [PATCH v2 1/4] arm64: mm: use single quantity to represent the PA to VA translation Ard Biesheuvel
2020-10-13 16:14 ` Steve Capper
2020-10-13 16:47 ` Steve Capper
2020-10-15 10:47 ` Will Deacon
2020-10-08 15:36 ` [PATCH v2 2/4] arm64: mm: extend linear region for 52-bit VA configurations Ard Biesheuvel
2020-10-13 16:51 ` Steve Capper
2020-10-13 16:57 ` Ard Biesheuvel
2020-10-13 17:38 ` Steve Capper
2020-10-14 3:44 ` Anshuman Khandual
2020-10-14 7:18 ` Ard Biesheuvel
2020-10-08 15:36 ` [PATCH v2 3/4] arm64: mm: make vmemmap region a projection of the linear region Ard Biesheuvel
2020-10-13 16:52 ` Steve Capper
2020-11-10 12:55 ` Geert Uytterhoeven
2020-11-10 13:10 ` Ard Biesheuvel
2020-11-10 14:08 ` Ard Biesheuvel
2020-11-10 14:56 ` Geert Uytterhoeven
2020-11-10 15:39 ` Catalin Marinas
2020-11-10 15:42 ` Ard Biesheuvel
2020-11-10 16:14 ` Catalin Marinas
2020-11-10 16:18 ` Ard Biesheuvel
2020-10-08 15:36 ` [PATCH v2 4/4] arm64: mm: tidy up top of kernel VA space Ard Biesheuvel
2020-10-13 16:52 ` Steve Capper
2020-10-09 14:16 ` [PATCH v2 0/4] arm64: mm: optimize VA space organization for 52-bit Ard Biesheuvel
2020-10-15 20:40 ` Will Deacon
2020-11-09 18:51 ` Catalin Marinas
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