From mboxrd@z Thu Jan 1 00:00:00 1970 From: sboyd@codeaurora.org (Stephen Boyd) Date: Wed, 29 Nov 2017 15:39:49 -0800 Subject: [PATCH] arm64: Inform user if software PAN is in use Message-ID: <20171129233949.1284-1-sboyd@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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 21e2c95d24e7..c6f8da17146b 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1189,6 +1189,9 @@ void __init setup_cpu_features(void) if (system_supports_32bit_el0()) setup_elf_hwcaps(compat_elf_hwcaps); + if (system_uses_ttbr0_pan()) + pr_info("Emulating Privileged Access Never (PAN) using TTBR0_EL1 switching\n"); + /* Advertise that we have computed the system capabilities */ set_sys_caps_initialised(); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project