From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>
Cc: Peter Maydell <peter.maydell@linaro.org>,
Richard Henderson <richard.henderson@linaro.org>,
Vincent Donnefort <vdonnefort@google.com>,
James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oliver.upton@linux.dev>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
Mark Brown <broonie@kernel.org>
Subject: [PATCH v2 1/2] arm64: booting: Document our requirements for fine grained traps with SME
Date: Tue, 1 Nov 2022 11:27:14 +0000 [thread overview]
Message-ID: <20221101112716.52035-2-broonie@kernel.org> (raw)
In-Reply-To: <20221101112716.52035-1-broonie@kernel.org>
With SME we require that fine grained traps on access to TPIDR2_EL0 and
SMPRI_EL1 are disabled but did not document that fact. Add the relevant
register bits.
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
Documentation/arm64/booting.rst | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/Documentation/arm64/booting.rst b/Documentation/arm64/booting.rst
index 8aefa1001ae5..8c324ad638de 100644
--- a/Documentation/arm64/booting.rst
+++ b/Documentation/arm64/booting.rst
@@ -340,6 +340,14 @@ Before jumping into the kernel, the following conditions must be met:
- SMCR_EL2.LEN must be initialised to the same value for all CPUs the
kernel will execute on.
+ - HWFGRTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
+
+ - HWFGWTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
+
+ - HWFGRTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
+
+ - HWFGWTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
+
For CPUs with the Scalable Matrix Extension FA64 feature (FEAT_SME_FA64)
- If EL3 is present:
--
2.30.2
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next prev parent reply other threads:[~2022-11-01 11:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-01 11:27 [PATCH v2 0/2] arm64/sme: Fix SMPRI_EL1 traps for KVM guests Mark Brown
2022-11-01 11:27 ` Mark Brown [this message]
2022-11-01 11:27 ` [PATCH v2 2/2] KVM: arm64: Trap access to SMPRI_EL1 and TPIDR2 in VHE mode Mark Brown
2022-11-01 13:33 ` Marc Zyngier
2022-11-01 14:30 ` Mark Brown
2022-11-01 19:35 ` Marc Zyngier
2022-11-01 19:34 ` (subset) [PATCH v2 0/2] arm64/sme: Fix SMPRI_EL1 traps for KVM guests Marc Zyngier
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