* [PATCH v2] arm64: kexec: Support the case of VA_BITS=39 in trans_pgd_idmap_page()
@ 2022-02-17 8:37 cgel.zte
2022-02-18 11:24 ` Catalin Marinas
0 siblings, 1 reply; 2+ messages in thread
From: cgel.zte @ 2022-02-17 8:37 UTC (permalink / raw)
To: catalin.marinas, will, pasha.tatashin, si.hao, linux-arm-kernel,
linux-kernel, yang.yang29, zealci
From: sihao <si.hao@zte.com.cn>
fsl64() may get different values due to different physical addresses. Is
it possible to confirm the value of max_msb with CONFIG_ARM64_VA_BITS?
Reported-by: sihao <si.hao@zte.com.cn>
Signed-off-by: sihao <si.hao@zte.com.cn>
Reviewed-by: CatalinMarinas <catalin.marinas@arm.com>
---
Changes in V1:
Refer to: https://lore.kernel.org/lkml/20220121065216.1001021-1-si.hao@zte.com.cn/
When the values of CONFIG_ARM64_VA_BITS and CONFIG_ARM64_PA_BITS are not
equal, the following panic occurs when kexec is executed.
This happens because trans_pgd_idmap_page() does not support VA_BITS=39.
So the patch supports the case of VA_BITS=39.
arch/arm64/mm/trans_pgd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/mm/trans_pgd.c b/arch/arm64/mm/trans_pgd.c
index d7da8ca40d2e..23c74f9c5790 100644
--- a/arch/arm64/mm/trans_pgd.c
+++ b/arch/arm64/mm/trans_pgd.c
@@ -232,7 +232,7 @@ int trans_pgd_idmap_page(struct trans_pgd_info *info, phys_addr_t *trans_ttbr0,
{
phys_addr_t dst_addr = virt_to_phys(page);
unsigned long pfn = __phys_to_pfn(dst_addr);
- int max_msb = (dst_addr & GENMASK(52, 48)) ? 51 : 47;
+ int max_msb = VA_BITS - 1;
int bits_mapped = PAGE_SHIFT - 4;
unsigned long level_mask, prev_level_entry, *levels[4];
int this_level, index, level_lsb, level_msb;
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] arm64: kexec: Support the case of VA_BITS=39 in trans_pgd_idmap_page()
2022-02-17 8:37 [PATCH v2] arm64: kexec: Support the case of VA_BITS=39 in trans_pgd_idmap_page() cgel.zte
@ 2022-02-18 11:24 ` Catalin Marinas
0 siblings, 0 replies; 2+ messages in thread
From: Catalin Marinas @ 2022-02-18 11:24 UTC (permalink / raw)
To: cgel.zte
Cc: will, pasha.tatashin, si.hao, linux-arm-kernel, linux-kernel,
yang.yang29, zealci
On Thu, Feb 17, 2022 at 08:37:34AM +0000, cgel.zte@gmail.com wrote:
> From: sihao <si.hao@zte.com.cn>
>
> fsl64() may get different values due to different physical addresses. Is
> it possible to confirm the value of max_msb with CONFIG_ARM64_VA_BITS?
>
> Reported-by: sihao <si.hao@zte.com.cn>
> Signed-off-by: sihao <si.hao@zte.com.cn>
> Reviewed-by: CatalinMarinas <catalin.marinas@arm.com>
I have not reviewed this patch yet, so this line shouldn't be here. I'll
have a look next week.
Thanks.
--
Catalin
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-02-17 8:37 [PATCH v2] arm64: kexec: Support the case of VA_BITS=39 in trans_pgd_idmap_page() cgel.zte
2022-02-18 11:24 ` Catalin Marinas
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