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 0/2] arm64: mm: optimize VA space organization for 52-bit
Date: Wed, 7 Oct 2020 00:49:51 +0200 [thread overview]
Message-ID: <20201006224953.8432-1-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, 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.
Not 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 (2):
arm64: mm: use single quantity to represent the PA to VA translation
arm64: mm: extend linear region for 52-bit VA configurations
Documentation/arm64/kasan-offsets.sh | 3 +-
arch/arm64/Kconfig | 20 ++++++------
arch/arm64/include/asm/memory.h | 13 ++++----
arch/arm64/include/asm/pgtable.h | 4 +--
arch/arm64/mm/init.c | 32 +++++++-------------
5 files changed, 30 insertions(+), 42 deletions(-)
--
2.17.1
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next reply other threads:[~2020-10-06 22:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-06 22:49 Ard Biesheuvel [this message]
2020-10-06 22:49 ` [PATCH 1/2] arm64: mm: use single quantity to represent the PA to VA translation Ard Biesheuvel
2020-10-06 22:49 ` [PATCH 2/2] arm64: mm: extend linear region for 52-bit VA configurations Ard Biesheuvel
2020-10-07 18:00 ` Ard Biesheuvel
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