* [PATCH v3] riscv: fix pfn_to_virt err in do_page_fault().
@ 2020-10-26 12:26 liush
2020-10-26 12:34 ` Pekka Enberg
2020-11-06 5:15 ` Palmer Dabbelt
0 siblings, 2 replies; 3+ messages in thread
From: liush @ 2020-10-26 12:26 UTC (permalink / raw)
To: paul.walmsley, palmer, aou, penberg, akpm, peterx, vbabka, walken
Cc: Liu Shaohua, linux-riscv, linux-kernel
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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^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH v3] riscv: fix pfn_to_virt err in do_page_fault().
2020-10-26 12:26 [PATCH v3] riscv: fix pfn_to_virt err in do_page_fault() liush
@ 2020-10-26 12:34 ` Pekka Enberg
2020-11-06 5:15 ` Palmer Dabbelt
1 sibling, 0 replies; 3+ messages in thread
From: Pekka Enberg @ 2020-10-26 12:34 UTC (permalink / raw)
To: liush
Cc: aou, linux-kernel, peterx, penberg, palmer, paul.walmsley, akpm,
walken, linux-riscv, vbabka
On Mon, Oct 26, 2020 at 08:26:54PM +0800, liush wrote:
> 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>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
> ---
> 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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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v3] riscv: fix pfn_to_virt err in do_page_fault().
2020-10-26 12:26 [PATCH v3] riscv: fix pfn_to_virt err in do_page_fault() liush
2020-10-26 12:34 ` Pekka Enberg
@ 2020-11-06 5:15 ` Palmer Dabbelt
1 sibling, 0 replies; 3+ messages in thread
From: Palmer Dabbelt @ 2020-11-06 5:15 UTC (permalink / raw)
To: liush
Cc: aou, liush, linux-kernel, peterx, penberg, Paul Walmsley, akpm,
walken, linux-riscv, vbabka
On Mon, 26 Oct 2020 05:26:54 PDT (-0700), liush@allwinnertech.com wrote:
> 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)) {
This is on fixes, thanks!
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2020-10-26 12:26 [PATCH v3] riscv: fix pfn_to_virt err in do_page_fault() liush
2020-10-26 12:34 ` Pekka Enberg
2020-11-06 5:15 ` Palmer Dabbelt
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