From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Cc: James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will@kernel.org>,
qperret@google.com, kernel-team@android.com
Subject: [PATCH 4/4] KVM: arm64: Force SCTLR_EL2.WXN when running nVHE
Date: Wed, 10 Mar 2021 15:26:56 +0000 [thread overview]
Message-ID: <20210310152656.3821253-5-maz@kernel.org> (raw)
In-Reply-To: <20210310152656.3821253-1-maz@kernel.org>
As the EL2 nVHE object is nicely split into sections and that
we already differenciating permissions for data and code,
we can enable SCTLR_EL2.WXN so that we don't have to worry
about misconfiguration of the page tables.
Flip the WXN bit and get the ball running!
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/include/asm/sysreg.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 9d1aef631646..cc17f7d487ed 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -580,7 +580,8 @@
#define SCTLR_ELx_M (BIT(0))
#define SCTLR_EL2_FLAGS (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | \
- SCTLR_ELx_SA | SCTLR_ELx_I | SCTLR_ELx_IESB)
+ SCTLR_ELx_SA | SCTLR_ELx_I | SCTLR_ELx_IESB | \
+ SCTLR_ELx_WXN)
/* SCTLR_EL2 specific flags. */
#define SCTLR_EL2_RES1 ((BIT(4)) | (BIT(5)) | (BIT(11)) | (BIT(16)) | \
--
2.29.2
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prev parent reply other threads:[~2021-03-10 15:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-10 15:26 [PATCH 0/4] KVM: arm64: Running the EL2 nVHE code with WXN Marc Zyngier
2021-03-10 15:26 ` [PATCH 1/4] arm64: Use INIT_SCTLR_EL1_MMU_OFF to disable the MMU on CPU restart Marc Zyngier
2021-03-10 15:26 ` [PATCH 2/4] KVM: arm64: Use INIT_SCTLR_EL2_MMU_OFF to disable the MMU on KVM teardown Marc Zyngier
2021-03-10 15:26 ` [PATCH 3/4] KVM: arm64: Rename SCTLR_ELx_FLAGS to SCTLR_EL2_FLAGS Marc Zyngier
2021-03-10 15:46 ` Will Deacon
2021-03-10 16:05 ` Marc Zyngier
2021-03-10 16:15 ` Will Deacon
2021-03-10 17:49 ` Marc Zyngier
2021-03-10 18:20 ` Will Deacon
2021-03-11 11:35 ` Mark Rutland
2021-03-11 12:00 ` Mark Rutland
2021-03-10 15:26 ` Marc Zyngier [this message]
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