From: Catalin Marinas <catalin.marinas@arm.com>
To: Steve Capper <steve.capper@arm.com>
Cc: crecklin@redhat.com, ard.biesheuvel@linaro.org, maz@kernel.org,
bhsharma@redhat.com, will@kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH V4 05/11] arm64: mm: Introduce VA_BITS_MIN
Date: Mon, 5 Aug 2019 18:17:46 +0100 [thread overview]
Message-ID: <20190805171745.GK4175@arrakis.emea.arm.com> (raw)
In-Reply-To: <20190729162117.832-6-steve.capper@arm.com>
On Mon, Jul 29, 2019 at 05:21:11PM +0100, Steve Capper wrote:
> In order to support 52-bit kernel addresses detectable at boot time, the
> kernel needs to know the most conservative VA_BITS possible should it
> need to fall back to this quantity due to lack of hardware support.
>
> A new compile time constant VA_BITS_MIN is introduced in this patch and
> it is employed in the KASAN end address, KASLR, and EFI stub.
>
> For Arm, if 52-bit VA support is unavailable the fallback is to 48-bits.
>
> In other words: VA_BITS_MIN = min (48, VA_BITS)
>
> Signed-off-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
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next prev parent reply other threads:[~2019-08-05 17:17 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-29 16:21 [PATCH V4 00/11] 52-bit kernel + user VAs Steve Capper
2019-07-29 16:21 ` [PATCH V4 01/11] arm64: mm: Remove bit-masking optimisations for PAGE_OFFSET and VMEMMAP_START Steve Capper
2019-08-05 11:07 ` Catalin Marinas
2019-07-29 16:21 ` [PATCH V4 02/11] arm64: mm: Flip kernel VA space Steve Capper
2019-08-05 11:29 ` Catalin Marinas
2019-08-05 11:50 ` Steve Capper
2019-07-29 16:21 ` [PATCH V4 03/11] arm64: kasan: Switch to using KASAN_SHADOW_OFFSET Steve Capper
2019-08-05 16:37 ` Catalin Marinas
2019-08-06 9:05 ` Steve Capper
2019-07-29 16:21 ` [PATCH V4 04/11] arm64: dump: De-constify VA_START and KASAN_SHADOW_START Steve Capper
2019-08-05 16:38 ` Catalin Marinas
2019-07-29 16:21 ` [PATCH V4 05/11] arm64: mm: Introduce VA_BITS_MIN Steve Capper
2019-08-05 17:17 ` Catalin Marinas [this message]
2019-08-05 17:20 ` Catalin Marinas
2019-08-06 9:11 ` Steve Capper
2019-07-29 16:21 ` [PATCH V4 06/11] arm64: mm: Introduce VA_BITS_ACTUAL Steve Capper
2019-08-05 17:26 ` Catalin Marinas
2019-08-06 11:32 ` Steve Capper
2019-08-06 14:48 ` Catalin Marinas
2019-08-07 13:27 ` Steve Capper
2019-07-29 16:21 ` [PATCH V4 07/11] arm64: mm: Logic to make offset_ttbr1 conditional Steve Capper
2019-08-05 17:06 ` Catalin Marinas
2019-07-29 16:21 ` [PATCH V4 08/11] arm64: mm: Separate out vmemmap Steve Capper
2019-08-05 17:07 ` Catalin Marinas
2019-07-29 16:21 ` [PATCH V4 09/11] arm64: mm: Modify calculation of VMEMMAP_SIZE Steve Capper
2019-08-05 17:10 ` Catalin Marinas
2019-07-29 16:21 ` [PATCH V4 10/11] arm64: mm: Introduce 52-bit Kernel VAs Steve Capper
2019-08-05 17:27 ` Catalin Marinas
2019-08-06 14:55 ` Catalin Marinas
2019-08-06 14:58 ` Catalin Marinas
2019-07-29 16:21 ` [PATCH V4 11/11] docs: arm64: Add layout and 52-bit info to memory document Steve Capper
2019-08-06 15:27 ` Catalin Marinas
2019-08-07 13:29 ` Steve Capper
2019-08-07 14:55 ` Will Deacon
2019-08-07 15:57 ` Steve Capper
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