From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: Mark Brown <broonie@kernel.org>, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 0/3] arm64: Make NOP handling a whitelist
Date: Fri, 1 May 2020 13:37:06 +0100 [thread overview]
Message-ID: <20200501123709.6640-1-broonie@kernel.org> (raw)
Currently we default to assuming any unrecognized instruction in the
hint space can be safely handled as a NOP. This is not robust and any
code that really wants a NOP should be using the explicitly defined NOP
so let's instead invert this and whitelist those instructions which it
is safe to handle as NOPs.
Patch 2 adds defines for the HINTs for BTI landing pads which will be
used by the in-kernel BTI series to generate landing pads in JITed BPF
code so it'd be good if this could be applied on or merged into the BTI
branch.
v3:
- Correct values for more of the HINTs.
- Add constants for additional HINTs
- Handle XPACLRI as a NOP along with all the other PAC HINTs.
- Update commit messages for greater clarity.
- Tweak the comment about what a NOP.
v2:
- Fix values for BTI HINTs.
- Rebase on v5.7-rc3+for-next/bti-user
Mark Brown (3):
arm64: insn: Don't assume unrecognized HINTs are NOPs
arm64: insn: Add constants for new HINT instruction decode
arm64: insn: Report PAC and BTI instructions as NOPs
arch/arm64/include/asm/insn.h | 28 ++++++++++++++++++++++++--
arch/arm64/kernel/insn.c | 37 ++++++++++++++++++++++++++---------
2 files changed, 54 insertions(+), 11 deletions(-)
--
2.20.1
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next reply other threads:[~2020-05-01 12:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 12:37 Mark Brown [this message]
2020-05-01 12:37 ` [PATCH v3 1/3] arm64: insn: Don't assume unrecognized HINTs are NOPs Mark Brown
2020-05-01 12:37 ` [PATCH v3 2/3] arm64: insn: Add constants for new HINT instruction decode Mark Brown
2020-05-01 12:37 ` [PATCH v3 3/3] arm64: insn: Report PAC and BTI instructions as NOPs Mark Brown
2020-05-01 12:57 ` Mark Rutland
2020-05-01 16:12 ` Mark Brown
2020-05-04 12:14 ` Will Deacon
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