From 894cfd149289c8c9c99211b58a2e3ae7027fff7e Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Wed, 29 Nov 2017 15:39:49 -0800 Subject: [PATCH] arm64: Inform user if software PAN is in use It isn't entirely obvious if we're using software PAN because we don't say anything about it in the boot log. But if we're using hardware PAN we'll print a nice CPU feature message indicating it. Add a print for software PAN too so we know if it's being used or not. Signed-off-by: Stephen Boyd Signed-off-by: Catalin Marinas --- arch/arm64/kernel/cpufeature.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 9f4491d16cfb..a11311397430 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1276,6 +1276,9 @@ static void verify_local_cpu_capabilities(void) if (system_supports_sve()) verify_sve_features(); + + if (system_uses_ttbr0_pan()) + pr_info("Emulating Privileged Access Never (PAN) using TTBR0_EL1 switching\n"); } void check_local_cpu_capabilities(void) -- 2.30.2