From: Marc Zyngier Date: Wed, 2 Oct 2019 09:06:13 +0000 (+0100) Subject: arm64: Document ICC_CTLR_EL3.PMHE setting requirements X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7e3a57fa6ca831fa232a7cd4659eaed674236810;p=linux.git arm64: Document ICC_CTLR_EL3.PMHE setting requirements It goes without saying, but better saying it: the kernel expects ICC_CTLR_EL3.PMHE to have the same value across all CPUs, and for that setting not to change during the lifetime of the kernel. Signed-off-by: Marc Zyngier Signed-off-by: Catalin Marinas --- diff --git a/Documentation/arm64/booting.rst b/Documentation/arm64/booting.rst index d3f3a60fbf252..5d78a6f5b0aed 100644 --- a/Documentation/arm64/booting.rst +++ b/Documentation/arm64/booting.rst @@ -213,6 +213,9 @@ Before jumping into the kernel, the following conditions must be met: - ICC_SRE_EL3.Enable (bit 3) must be initialiased to 0b1. - ICC_SRE_EL3.SRE (bit 0) must be initialised to 0b1. + - ICC_CTLR_EL3.PMHE (bit 6) must be set to the same value across + all CPUs the kernel is executing on, and must stay constant + for the lifetime of the kernel. - If the kernel is entered at EL1: