From: Catalin Marinas <catalin.marinas@arm.com>
To: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] arm64: Add initial support for E0PD
Date: Fri, 28 Jun 2019 17:36:42 +0100 [thread overview]
Message-ID: <20190628163642.GB56463@arrakis.emea.arm.com> (raw)
In-Reply-To: <20190628123040.GG5379@sirena.org.uk>
On Fri, Jun 28, 2019 at 01:30:40PM +0100, Mark Brown wrote:
> On Fri, Jun 28, 2019 at 12:04:30PM +0100, Will Deacon wrote:
> > Thanks for the quick v2, although I still don't see the rush to merge this
> > without the associated kaslr/kpti changes we've been discussing. It's not
> > like there's a whole load of 8.5 silicon we're rushing to support.
>
> It's largely on the general theory that it's better to carry less out of
> tree code - there's less diff to manage, less chance of collisions with
> other work (in either direction), and less pending review to worry about.
> So long as something represents forward progress I tend to work on the
> basis of why not rather than why.
A reason is that once we add the support for disabling kpti based on
the E0PD feature, this patch may turn out to be slightly different (for
example, you may add a common has_e0pd() check that is called from
both unmap_kernel_at_el0() and the E0PD arm64_features[] entry). Given
that both patches would be relatively small, I agree with Will that
there is no rush to merge them independently.
--
Catalin
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next prev parent reply other threads:[~2019-06-28 16:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-27 14:15 [PATCH v2] arm64: Add initial support for E0PD Mark Brown
2019-06-28 11:04 ` Will Deacon
2019-06-28 12:30 ` Mark Brown
2019-06-28 16:36 ` Catalin Marinas [this message]
2019-06-28 17:39 ` Mark Brown
2019-06-29 13:21 ` Catalin Marinas
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