Messages in this thread Patch in this message | | | From | Stephen Boyd <> | Subject | [PATCH] arm64: Inform user if software PAN is in use | Date | Wed, 29 Nov 2017 15:39:49 -0800 |
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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 <sboyd@codeaurora.org> --- 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
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