From: Joerg Roedel <[email protected]> Implement the function to sync changes in vmalloc and ioremap ranges to all page-tables.
Signed-off-by: Joerg Roedel <[email protected]> --- arch/x86/include/asm/pgtable-2level_types.h | 2 ++ arch/x86/include/asm/pgtable-3level_types.h | 2 ++ arch/x86/mm/fault.c | 25 +++++++++++++-------- 3 files changed, 20 insertions(+), 9 deletions(-) diff --git a/arch/x86/include/asm/pgtable-2level_types.h b/arch/x86/include/asm/pgtable-2level_types.h index 6deb6cd236e3..7f6ccff0ba72 100644 --- a/arch/x86/include/asm/pgtable-2level_types.h +++ b/arch/x86/include/asm/pgtable-2level_types.h @@ -20,6 +20,8 @@ typedef union { #define SHARED_KERNEL_PMD 0 +#define ARCH_PAGE_TABLE_SYNC_MASK PGTBL_PMD_MODIFIED + /* * traditional i386 two-level paging structure: */ diff --git a/arch/x86/include/asm/pgtable-3level_types.h b/arch/x86/include/asm/pgtable-3level_types.h index 33845d36897c..80fbb4a9ed87 100644 --- a/arch/x86/include/asm/pgtable-3level_types.h +++ b/arch/x86/include/asm/pgtable-3level_types.h @@ -27,6 +27,8 @@ typedef union { #define SHARED_KERNEL_PMD (!static_cpu_has(X86_FEATURE_PTI)) #endif +#define ARCH_PAGE_TABLE_SYNC_MASK (SHARED_KERNEL_PMD ? 0 : PGTBL_PMD_MODIFIED) + /* * PGDIR_SHIFT determines what a top-level page table entry can map */ diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index a51df516b87b..edeb2adaf31f 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -190,16 +190,13 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address) return pmd_k; } -static void vmalloc_sync(void) +void arch_sync_kernel_mappings(unsigned long start, unsigned long end) { - unsigned long address; - - if (SHARED_KERNEL_PMD) - return; + unsigned long addr; - for (address = VMALLOC_START & PMD_MASK; - address >= TASK_SIZE_MAX && address < VMALLOC_END; - address += PMD_SIZE) { + for (addr = start & PMD_MASK; + addr >= TASK_SIZE_MAX && addr < VMALLOC_END; + addr += PMD_SIZE) { struct page *page; spin_lock(&pgd_lock); @@ -210,13 +207,23 @@ static void vmalloc_sync(void) pgt_lock = &pgd_page_get_mm(page)->page_table_lock; spin_lock(pgt_lock); - vmalloc_sync_one(page_address(page), address); + vmalloc_sync_one(page_address(page), addr); spin_unlock(pgt_lock); } spin_unlock(&pgd_lock); } } +static void vmalloc_sync(void) +{ + unsigned long address; + + if (SHARED_KERNEL_PMD) + return; + + arch_sync_kernel_mappings(VMALLOC_START, VMALLOC_END); +} + void vmalloc_sync_mappings(void) { vmalloc_sync(); -- 2.17.1
