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 v5 4/4] arm64: Use a variable to store non-global mappings decision
Date: Wed, 6 Nov 2019 09:13:16 +0000 [thread overview]
Message-ID: <20191106091316.GD21133@arrakis.emea.arm.com> (raw)
In-Reply-To: <20191105174445.GD4500@sirena.co.uk>
On Tue, Nov 05, 2019 at 05:44:45PM +0000, Mark Brown wrote:
> On Tue, Nov 05, 2019 at 05:30:06PM +0000, Catalin Marinas wrote:
> > On Mon, Nov 04, 2019 at 07:15:24PM +0000, Mark Brown wrote:
>
> > > + /*
> > > + * If know now we are going to need KPTI then use non-global
> > > + * mappings from the start, avoiding the cost of rewriting
> > > + * everything later.
> > > + */
> > > + arm64_use_ng_mappings = kaslr_requires_kpti();
> > > }
>
> > I think we need this even earlier in paging_init() before we start
> > creating the kernel mappings.
>
> OK, I'll move it. I didn't see any global mappings getting created with
> the current code but better safe than sorry.
I gave these patches a try under kvm/qemu on TX2 and most of the linear
map turns out global in ptdump.
I'll try your other series.
--
Catalin
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prev parent reply other threads:[~2019-11-06 9:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-04 19:15 [PATCH v5 0/4] E0PD support Mark Brown
2019-11-04 19:15 ` [PATCH v5 1/4] arm64: Add initial support for E0PD Mark Brown
2019-11-04 19:15 ` [PATCH v5 2/4] arm64: Factor out checks for KASLR in KPTI code into separate function Mark Brown
2019-11-04 19:15 ` [PATCH v5 3/4] arm64: Don't use KPTI where we have E0PD Mark Brown
2019-11-04 19:15 ` [PATCH v5 4/4] arm64: Use a variable to store non-global mappings decision Mark Brown
2019-11-05 17:30 ` Catalin Marinas
2019-11-05 17:44 ` Mark Brown
2019-11-06 9:13 ` Catalin Marinas [this message]
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