From: Alexandre Ghiti alex@ghiti.fr
commit 0f02de4481da684aad6589aed0ea47bd1ab391c9 upstream.
At early boot stage, we have a whole PGDIR to map the kernel, so there is no need to restrict the early mapping size to 128MB. Removing this define also allows us to simplify some compile time logic.
This fixes large kernel mappings with a size greater than 128MB, as it is the case for syzbot kernels whose size was just ~130MB.
Note that on rv64, for now, we are then limited to PGDIR size for early mapping as we can't use PGD mappings (see [1]). That should be enough given the relative small size of syzbot kernels compared to PGDIR_SIZE which is 1GB.
[1] https://lore.kernel.org/lkml/20200603153608.30056-1-alex@ghiti.fr/
Reported-by: Dmitry Vyukov dvyukov@google.com Signed-off-by: Alexandre Ghiti alex@ghiti.fr Tested-by: Dmitry Vyukov dvyukov@google.com Signed-off-by: Palmer Dabbelt palmerdabbelt@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/mm/init.c | 21 +++++---------------- 1 file changed, 5 insertions(+), 16 deletions(-)
--- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -222,8 +222,6 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD] __pag pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
-#define MAX_EARLY_MAPPING_SIZE SZ_128M - pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) @@ -298,13 +296,7 @@ static void __init create_pte_mapping(pt
pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; - -#if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE -#define NUM_EARLY_PMDS 1UL -#else -#define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE) -#endif -pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE); +pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) @@ -326,11 +318,9 @@ static pmd_t *get_pmd_virt_late(phys_add
static phys_addr_t __init alloc_pmd_early(uintptr_t va) { - uintptr_t pmd_num; + BUG_ON((va - PAGE_OFFSET) >> PGDIR_SHIFT);
- pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT; - BUG_ON(pmd_num >= NUM_EARLY_PMDS); - return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD]; + return (uintptr_t)early_pmd; }
static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) @@ -448,7 +438,7 @@ asmlinkage void __init setup_vm(uintptr_ uintptr_t va, pa, end_va; uintptr_t load_pa = (uintptr_t)(&_start); uintptr_t load_sz = (uintptr_t)(&_end) - load_pa; - uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE); + uintptr_t map_size; #ifndef __PAGETABLE_PMD_FOLDED pmd_t fix_bmap_spmd, fix_bmap_epmd; #endif @@ -460,12 +450,11 @@ asmlinkage void __init setup_vm(uintptr_ * Enforce boot alignment requirements of RV32 and * RV64 by only allowing PMD or PGD mappings. */ - BUG_ON(map_size == PAGE_SIZE); + map_size = PMD_SIZE;
/* Sanity check alignment and size */ BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); BUG_ON((load_pa % map_size) != 0); - BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE);
pt_ops.alloc_pte = alloc_pte_early; pt_ops.get_pte_virt = get_pte_virt_early;