x86/mm/32: implement arch_sync_kernel_mappings() (86cf69f1) · Commits · 戴 / test

arch/x86/include/asm/pgtable-2level_types.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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:
		*/

+2 −0

Original line number	Diff line number	Diff line
		@@ -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
		*/

+16 −9

Original line number	Diff line number	Diff line
		@@ -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();