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From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
 linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/4] KVM: arm64: Running the EL2 nVHE code with WXN
Date: Wed, 10 Mar 2021 15:26:52 +0000
Message-Id: <20210310152656.3821253-1-maz@kernel.org>
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Cc: kernel-team@android.com, Will Deacon <will@kernel.org>
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Since we use distinct permissions when mapping things at EL2 depending
on whether they are text or data, we are already using a W^X setup
with nVHE.

This trivial series aims to enforce it by setting SCTLR_EL2.WXN at all
times. It just cleans up a couple of code paths so that
SCTLR_ELx_FLAGS is only used by the KVM setup code, and finally sets
the WXN flag permanently.

Lightly tested on an A53 system with 4KB and 64KB pages.

Thanks,

	M.

Marc Zyngier (4):
  arm64: Use INIT_SCTLR_EL1_MMU_OFF to disable the MMU on CPU restart
  KVM: arm64: Use INIT_SCTLR_EL2_MMU_OFF to disable the MMU on KVM
    teardown
  KVM: arm64: Rename SCTLR_ELx_FLAGS to SCTLR_EL2_FLAGS
  KVM: arm64: Force SCTLR_EL2.WXN when running nVHE

 arch/arm64/include/asm/sysreg.h    | 5 +++--
 arch/arm64/kernel/cpu-reset.S      | 5 +----
 arch/arm64/kvm/hyp/nvhe/hyp-init.S | 6 ++----
 3 files changed, 6 insertions(+), 10 deletions(-)

-- 
2.29.2

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