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x86/cpu: Write the default PKRU value when enabling PKE

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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>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121455.622983906@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-06-23 14:02:10 +02:00 committed by Borislav Petkov
parent ff7ebff47c
commit fa8c84b77a
1 changed files with 2 additions and 0 deletions
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arch/x86/kernel/cpu/common.c
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@ -480,6 +480,8 @@ static __always_inline void setup_pku(struct cpuinfo_x86 *c)
}
cr4_set_bits(X86_CR4_PKE);
/* Load the default PKRU value */
pkru_write_default();
}
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS