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powerpc/kuap: Prepare for supporting KUAP on BOOK3E/64

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Also call kuap_lock() and kuap_save_and_lock() from
interrupt functions with CONFIG_PPC64.

For book3s/64 we keep them empty as it is done in assembly.

Also do the locked assert when switching task unless it is
book3s/64.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1cbf94e26e6d6e2e028fd687588a7e6622d454a6.1634627931.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2021-10-19 09:29:26 +02:00
committed by Michael Ellerman
parent 047a6fd401
commit 42e03bc524
4 changed files with 14 additions and 5 deletions
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2
arch/powerpc/include/asm/interrupt.h
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@@ -154,12 +154,14 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup
local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
if (user_mode(regs)) {
kuap_lock();
CT_WARN_ON(ct_state() != CONTEXT_USER);
user_exit_irqoff();
account_cpu_user_entry();
account_stolen_time();
} else {
kuap_save_and_lock(regs);
/*
* CT_WARN_ON comes here via program_check_exception,
* so avoid recursion.