linux-kernel - Re: [PATCH 01/29] arm64: mm: Use non-global mappings for kernel space

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Date:   Thu, 1 Mar 2018 19:53:55 +0800
From:   Alex Shi <alex.shi@...aro.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Marc Zyngier <marc.zyngier@....com>,
        Will Deacon <will.deacon@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        stable@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/29] arm64: mm: Use non-global mappings for kernel space



On 02/28/2018 08:08 PM, Greg KH wrote:
> On Wed, Feb 28, 2018 at 11:56:23AM +0800, Alex Shi wrote:
>> From: Will Deacon <will.deacon@....com>
>>
>> commit e046eb0c9bf2 upstream.
>>
>> In preparation for unmapping the kernel whilst running in userspace,
>> make the kernel mappings non-global so we can avoid expensive TLB
>> invalidation on kernel exit to userspace.
>>
>> Reviewed-by: Mark Rutland <mark.rutland@....com>
>> Tested-by: Laura Abbott <labbott@...hat.com>
>> Tested-by: Shanker Donthineni <shankerd@...eaurora.org>
>> Signed-off-by: Will Deacon <will.deacon@....com>
>> Signed-off-by: Alex Shi <alex.shi@...aro.org>
>>
>> Conflicts:
>> 	skip PTE_RDONLY of PAGE_NONE in arch/arm64/include/asm/pgtable-prot.h
> 
> These "Conflicts:" lines need to be removed, or put below the --- line
> please.
> 

Thanks response! Greg,

There are still a boot hang on one of renesas board on
CONFIG_RANDOMIZE_BASE. I am trying to get help from Renesas guys help on
this. I will back after fix it.

https://kernelci.org/boot/id/5a96f3dd59b5146590b3a4d5/

Thanks
Alex