From: Mark Brown <broonie@kernel•org>
To: Suzuki K Poulose <suzuki.poulose@arm•com>
Cc: Catalin Marinas <catalin.marinas@arm•com>,
Will Deacon <will@kernel•org>,
linux-arm-kernel@lists•infradead.org
Subject: Re: [PATCH v8 3/4] arm64: Don't use KPTI where we have E0PD
Date: Mon, 11 Nov 2019 16:36:30 +0000 [thread overview]
Message-ID: <20191111163630.GB4264@sirena.co.uk> (raw)
In-Reply-To: <5d846391-8d16-4b85-a83f-b48e636e2834@arm.com>
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On Mon, Nov 11, 2019 at 02:36:34PM +0000, Suzuki K Poulose wrote:
> On 08/11/2019 17:01, Mark Brown wrote:
> > + /*
> > + * E0PD does a similar job to KPTI so can be used instead
> > + * where available. This will only run before the cpufeature
> s/This will only run/This will run/ ?
Both with and without patch 4 we only check this when cpucaps aren't
ready - with just this patch this is done in arm64_kernel_use_ng_mappings()
where it has a check for caps being ready prior to checking if KASLR
requirs KPTI, or otherwise the checks are from the cpufeature code while
it's running. With patch 4 it's only called from the cpufeature code or
from the early init check.
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next prev parent reply other threads:[~2019-11-11 16:36 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-08 17:01 [PATCH v8 0/4] E0PD support Mark Brown
2019-11-08 17:01 ` [PATCH v8 1/4] arm64: Add initial support for E0PD Mark Brown
2019-11-11 14:22 ` Suzuki K Poulose
2019-11-11 17:35 ` Mark Brown
2019-11-08 17:01 ` [PATCH v8 2/4] arm64: Factor out checks for KASLR in KPTI code into separate function Mark Brown
2019-11-11 14:31 ` Suzuki K Poulose
2019-11-08 17:01 ` [PATCH v8 3/4] arm64: Don't use KPTI where we have E0PD Mark Brown
2019-11-11 14:36 ` Suzuki K Poulose
2019-11-11 16:36 ` Mark Brown [this message]
2019-11-11 17:36 ` Suzuki K Poulose
2019-11-08 17:01 ` [PATCH v8 4/4] arm64: Use a variable to store non-global mappings decision Mark Brown
2019-11-11 14:39 ` Suzuki K Poulose
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