From: Joerg Roedel <jroedel@xxxxxxx> Subject: x86/mm/64: implement arch_sync_kernel_mappings() Implement the function to sync changes in vmalloc and ioremap ranges to all page-tables. Link: http://lkml.kernel.org/r/20200515140023.25469-5-joro@xxxxxxxxxx Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Acked-by: Andy Lutomirski <luto@xxxxxxxxxx> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: "H . Peter Anvin" <hpa@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxx> Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> Cc: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/pgtable_64_types.h | 2 ++ arch/x86/mm/init_64.c | 5 +++++ 2 files changed, 7 insertions(+) --- a/arch/x86/include/asm/pgtable_64_types.h~x86-mm-64-implement-arch_sync_kernel_mappings +++ a/arch/x86/include/asm/pgtable_64_types.h @@ -159,4 +159,6 @@ extern unsigned int ptrs_per_p4d; #define PGD_KERNEL_START ((PAGE_SIZE / 2) / sizeof(pgd_t)) +#define ARCH_PAGE_TABLE_SYNC_MASK (pgtable_l5_enabled() ? PGTBL_PGD_MODIFIED : PGTBL_P4D_MODIFIED) + #endif /* _ASM_X86_PGTABLE_64_DEFS_H */ --- a/arch/x86/mm/init_64.c~x86-mm-64-implement-arch_sync_kernel_mappings +++ a/arch/x86/mm/init_64.c @@ -218,6 +218,11 @@ void sync_global_pgds(unsigned long star sync_global_pgds_l4(start, end); } +void arch_sync_kernel_mappings(unsigned long start, unsigned long end) +{ + sync_global_pgds(start, end); +} + /* * NOTE: This function is marked __ref because it calls __init function * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. _
