2021-06-03 08:41:36 +00:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <asm/kup.h>
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2021-06-03 08:41:41 +00:00
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#include <asm/smp.h>
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2021-06-03 08:41:36 +00:00
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2021-06-28 06:56:11 +00:00
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void setup_kuap(bool disabled)
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2021-06-03 08:41:36 +00:00
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{
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2021-10-19 09:29:18 +02:00
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if (!disabled) {
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2023-07-11 17:59:19 +02:00
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update_user_segments(mfsr(0) | SR_KS);
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isync(); /* Context sync required after mtsr() */
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2021-10-19 09:29:18 +02:00
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init_mm.context.sr0 |= SR_KS;
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current->thread.sr0 |= SR_KS;
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}
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2021-06-03 08:41:41 +00:00
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if (smp_processor_id() != boot_cpuid)
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return;
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2021-06-03 08:41:36 +00:00
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if (disabled)
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2023-07-11 17:59:18 +02:00
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cur_cpu_spec->mmu_features &= ~MMU_FTR_KUAP;
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2021-06-03 08:41:43 +00:00
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else
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pr_info("Activating Kernel Userspace Access Protection\n");
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2021-06-03 08:41:36 +00:00
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}
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