From: jeremy.linton@arm.com (Jeremy Linton)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: mm: Prevent the initial page table setup from creating larger blocks
Date: Wed, 25 Nov 2015 16:58:52 -0600 [thread overview]
Message-ID: <56563D2C.7050807@arm.com> (raw)
In-Reply-To: <1448387338-27851-1-git-send-email-catalin.marinas@arm.com>
On 11/24/2015 11:48 AM, Catalin Marinas wrote:
> This patch prevents the larger block mappings at all levels _if_ the
> existing pud/pmd entry is present _and_ not already a block mapping.
> Contiguous ptes are rejected if any of the entries in the range are
> non-empty and non-contiguous.
>
> In addition, TLB flushing is added for the cases where an existing block
> entry is changed.
Ok, it seems to boot fairly reliably on the m400/ACPI, over a few dozen
reboots yesterday and today. So, for that:
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
That said, it basically disables the CONT ranges for the main kernel
text section.
With this patch:
0xfffffe0000000000-0xfffffe0000090000 (paddr=0x4000000000) 576K
RW NX SHD AF UXN MEM/NORMAL
0xfffffe0000090000-0xfffffe0000c50000 (paddr=0x4000090000) 12032K
ro x SHD AF UXN MEM/NORMAL
0xfffffe0000c50000-0xfffffe0001600000 (paddr=0x4000c50000) 9920K
RW NX SHD AF UXN MEM/NORMAL
0xfffffe0001600000-0xfffffe0020000000 (paddr=0x4001600000) 490M
RW NX SHD AF CON UXN MEM/NORMAL
0xfffffe0020000000-0xfffffe1000000000 (paddr=0x4020000000) 65024M
RW NX SHD AF BLK UXN MEM/NORMAL
without:
0xfffffe0000000000-0xfffffe0000090000 (paddr=0x4000000000) 576K
RW NX SHD AF UXN MEM/NORMAL
0xfffffe0000090000-0xfffffe0000200000 (paddr=0x4000090000) 1472K
ro x SHD AF UXN MEM/NORMAL
0xfffffe0000200000-0xfffffe0000c00000 (paddr=0x4000200000) 10M
ro x SHD AF CON UXN MEM/NORMAL
0xfffffe0000c00000-0xfffffe0000c50000 (paddr=0x4000c00000) 320K
ro x SHD AF UXN MEM/NORMAL
0xfffffe0000c50000-0xfffffe0000e00000 (paddr=0x4000c50000) 1728K
RW NX SHD AF UXN MEM/NORMAL
0xfffffe0000e00000-0xfffffe0020000000 (paddr=0x4000e00000) 498M
RW NX SHD AF CON UXN MEM/NORMAL
0xfffffe0020000000-0xfffffe1000000000 (paddr=0x4020000000) 65024M
RW NX SHD AF BLK UXN MEM/NORMAL
next prev parent reply other threads:[~2015-11-25 22:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-24 17:48 [PATCH] arm64: mm: Prevent the initial page table setup from creating larger blocks Catalin Marinas
2015-11-25 16:31 ` Jeremy Linton
2015-11-25 18:08 ` Catalin Marinas
2015-11-25 22:58 ` Jeremy Linton [this message]
2015-11-26 16:06 ` Catalin Marinas
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