| Date | Fri, 11 Jun 2021 18:15:51 +0200 | From | Thomas Gleixner <> | Subject | [patch 28/41] x86/cpu: Write the default PKRU value when enabling PKE |
| |
In preparation of making the PKRU management more independent from XSTATES, write the default PKRU value into the hardware right after enabling PKRU in CR4. This ensures that switch_to() and copy_thread() have the correct setting for init task and the per CPU idle threads right away.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/kernel/cpu/common.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -479,6 +479,8 @@ static __always_inline void setup_pku(st } cr4_set_bits(X86_CR4_PKE); + /* Load the default PKRU value */ + pkru_write_default(); } #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
|