diff options
| author | Will Deacon <will@kernel.org> | 2024-01-04 12:28:46 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-01-04 12:32:33 +0000 |
| commit | db32cf8e280b46726065c518e90761bb0229bacf (patch) | |
| tree | 9b6c6129f6832b0850dcc24dcdc4491c4caa96d0 /arch | |
| parent | 3e8626b4ed5679812a496d43dcd1fab1fae546f4 (diff) | |
| parent | 3c0696076aad60a2f04c019761921954579e1b0e (diff) | |
Merge branch 'for-next/fixes' into for-next/core
Merge in arm64 fixes queued for 6.7 so that kpti_install_ng_mappings()
can be updated to use arm64_kernel_unmapped_at_el0() instead of checking
the ARM64_UNMAP_KERNEL_AT_EL0 CPU capability directly.
* for-next/fixes:
arm64: mm: Always make sw-dirty PTEs hw-dirty in pte_modify
perf/arm-cmn: Fail DTC counter allocation correctly
arm64: Avoid enabling KPTI unnecessarily
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 6 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 4 |
2 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index b19a8aee684c..79ce70fbb751 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -834,6 +834,12 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) pte = set_pte_bit(pte, __pgprot(PTE_DIRTY)); pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); + /* + * If we end up clearing hw dirtiness for a sw-dirty PTE, set hardware + * dirtiness again. + */ + if (pte_sw_dirty(pte)) + pte = pte_mkdirty(pte); return pte; } diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 73b10e64b9df..01a4c1d7fc09 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1843,6 +1843,10 @@ static int __init __kpti_install_ng_mappings(void *__unused) static void __init kpti_install_ng_mappings(void) { + /* Check whether KPTI is going to be used */ + if (!arm64_kernel_unmapped_at_el0()) + return; + /* * We don't need to rewrite the page-tables if either we've done * it already or we have KASLR enabled and therefore have not |