Messages in this thread Patch in this message | | | From | liush <> | Subject | [PATCH v3] riscv: fix pfn_to_virt err in do_page_fault(). | Date | Mon, 26 Oct 2020 20:26:54 +0800 |
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From: Liu Shaohua <liush@allwinnertech.com>
The argument to pfn_to_virt() should be pfn not the value of CSR_SATP.
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com> Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: liush <liush@allwinnertech.com> --- arch/riscv/mm/fault.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 1359e21..3c8b9e4 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -86,6 +86,7 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a pmd_t *pmd, *pmd_k; pte_t *pte_k; int index; + unsigned long pfn; /* User mode accesses just cause a SIGSEGV */ if (user_mode(regs)) @@ -100,7 +101,8 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a * of a task switch. */ index = pgd_index(addr); - pgd = (pgd_t *)pfn_to_virt(csr_read(CSR_SATP)) + index; + pfn = csr_read(CSR_SATP) & SATP_PPN; + pgd = (pgd_t *)pfn_to_virt(pfn) + index; pgd_k = init_mm.pgd + index; if (!pgd_present(*pgd_k)) { -- 2.7.4
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