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RISC-V: Use non-PGD mappings for early DTB access
Currently, we use PGD mappings for early DTB mapping in early_pgd
but this breaks Linux kernel on SiFive Unleashed because on SiFive
Unleashed PMP checks don't work correctly for PGD mappings.
To fix early DTB mappings on SiFive Unleashed, we use non-PGD
mappings (i.e. PMD) for early DTB access.
Fixes: 8f3a2b4a96
("RISC-V: Move DT mapping outof fixmap")
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Tested-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
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1 changed files with 14 additions and 0 deletions
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@ -293,6 +293,7 @@ pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
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#define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
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#define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
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#endif
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#endif
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pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);
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pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);
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pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
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static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
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static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
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{
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{
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@ -490,6 +491,18 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
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load_pa + (va - PAGE_OFFSET),
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load_pa + (va - PAGE_OFFSET),
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map_size, PAGE_KERNEL_EXEC);
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map_size, PAGE_KERNEL_EXEC);
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#ifndef __PAGETABLE_PMD_FOLDED
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/* Setup early PMD for DTB */
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create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
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(uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
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/* Create two consecutive PMD mappings for FDT early scan */
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pa = dtb_pa & ~(PMD_SIZE - 1);
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create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
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pa, PMD_SIZE, PAGE_KERNEL);
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create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
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pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
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dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
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#else
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/* Create two consecutive PGD mappings for FDT early scan */
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/* Create two consecutive PGD mappings for FDT early scan */
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pa = dtb_pa & ~(PGDIR_SIZE - 1);
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pa = dtb_pa & ~(PGDIR_SIZE - 1);
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create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
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create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
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@ -497,6 +510,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
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create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
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create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
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pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
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pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
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dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
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dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
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#endif
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dtb_early_pa = dtb_pa;
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dtb_early_pa = dtb_pa;
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/*
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/*
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