| Message ID | 20171129233949.1284-1-sboyd@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Nov 29, 2017 at 03:39:49PM -0800, Stephen Boyd wrote: > 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> Applied for 4.16. Thanks.
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();
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(+)