linux-kernel - Re: [PATCH v2 00/18] arm64: Unmap the kernel whilst running in userspace (KAISER)

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Message-ID: <f86ac529-d763-9f90-1ced-b8a28f545582@linux.intel.com>
Date:   Fri, 1 Dec 2017 10:02:43 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Mark Rutland <mark.rutland@....com>,
        Will Deacon <will.deacon@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, ard.biesheuvel@...aro.org,
        sboyd@...eaurora.org, keescook@...omium.org, msalter@...hat.com,
        labbott@...hat.com, tglx@...utronix.de
Subject: Re: [PATCH v2 00/18] arm64: Unmap the kernel whilst running in
 userspace (KAISER)

On 12/01/2017 09:58 AM, Mark Rutland wrote:
> On Fri, Dec 01, 2017 at 05:50:26PM +0000, Will Deacon wrote:
>> On Fri, Dec 01, 2017 at 02:04:06PM +0000, Mark Rutland wrote:
>>> On Thu, Nov 30, 2017 at 04:39:28PM +0000, Will Deacon wrote:
>> Thanks for going through this. Do you have any ideas about what we could
>> rename the command-line option to? I'll get us started:
>>
>>   - kaiser=
>>   - hidekernel=
>>   - unmapkernel=
>>   - hardenkaslr=
>>   - swuan=
> Off all of these, I think "unmapkernel" is the clear winner, since it
> says what it does in the tin (even if it misses the when).
> 
> I'll have a think over the weekend.

On the x86 side we've been leaning toward renaming kaiser to something
like "user pagetable isolation", so the boot parameter is something like
"noupti".

But I think the consensus is definitely to get rid of "kaiser".