arm64: add function to install the idmap
In some cases (e.g. when making invasive changes to the kernel page tables) we will need to execute code from the idmap. Add a new helper which may be used to install the idmap, complementing the existing cpu_uninstall_idmap. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Jeremy Linton <jeremy.linton@arm.com> Cc: Laura Abbott <labbott@fedoraproject.org> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -74,7 +74,7 @@ static inline bool __cpu_uses_extended_idmap(void)
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/*
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* Set TCR.T0SZ to its default value (based on VA_BITS)
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*/
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static inline void cpu_set_default_tcr_t0sz(void)
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static inline void __cpu_set_tcr_t0sz(unsigned long t0sz)
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{
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unsigned long tcr;
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@ -87,9 +87,12 @@ static inline void cpu_set_default_tcr_t0sz(void)
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" msr tcr_el1, %0 ;"
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" isb"
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: "=&r" (tcr)
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: "r"(TCR_T0SZ(VA_BITS)), "I"(TCR_T0SZ_OFFSET), "I"(TCR_TxSZ_WIDTH));
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: "r"(t0sz), "I"(TCR_T0SZ_OFFSET), "I"(TCR_TxSZ_WIDTH));
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}
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#define cpu_set_default_tcr_t0sz() __cpu_set_tcr_t0sz(TCR_T0SZ(VA_BITS))
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#define cpu_set_idmap_tcr_t0sz() __cpu_set_tcr_t0sz(idmap_t0sz)
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/*
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* Remove the idmap from TTBR0_EL1 and install the pgd of the active mm.
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*
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@ -114,6 +117,15 @@ static inline void cpu_uninstall_idmap(void)
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cpu_switch_mm(mm->pgd, mm);
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}
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static inline void cpu_install_idmap(void)
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{
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cpu_set_reserved_ttbr0();
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local_flush_tlb_all();
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cpu_set_idmap_tcr_t0sz();
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cpu_switch_mm(idmap_pg_dir, &init_mm);
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}
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/*
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* It would be nice to return ASIDs back to the allocator, but unfortunately
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* that introduces a race with a generation rollover where we could erroneously
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