[PATCH 5/5] arm64: Document the requirement for SCR_EL3.HCE
From: Marc Zyngier <maz@kernel.org>
Date: 2021-08-12 19:02:48
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documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
It is amazing that we never documented this absolutely basic requirement: if you boot the kernel at EL2, you'd better enable the HVC instruction from EL3. Really, just do it. Signed-off-by: Marc Zyngier <maz@kernel.org> --- Documentation/arm64/booting.rst | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/Documentation/arm64/booting.rst b/Documentation/arm64/booting.rst
index a9192e7a231b..6c729d0c4bc2 100644
--- a/Documentation/arm64/booting.rst
+++ b/Documentation/arm64/booting.rst@@ -212,6 +212,11 @@ Before jumping into the kernel, the following conditions must be met: - The value of SCR_EL3.FIQ must be the same as the one present at boot time whenever the kernel is executing. + For all systems: + - If EL3 is present and the kernel is entered at EL2: + + - SCR_EL3.HCE (bit 8) must be initialised to 0b1. + For systems with a GICv3 interrupt controller to be used in v3 mode: - If EL3 is present:
--
2.30.2
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