Offset vmemmap so that the first page of vmemmap will be mapped
to the first page of physical memory in order to ensure that
vmemmap’s bounds will be respected during
pfn_to_page()/page_to_pfn() operations.
The conversion macros will produce correct SV39/48/57 addresses
for every possible/valid DRAM_BASE inside the physical memory limits.
v2:Address Alex's comments
Suggested-by: Alexandre Ghiti <[email protected]>
Signed-off-by: Dimitris Vlachos <[email protected]>
Reported-by: Dimitris Vlachos <[email protected]>
Closes: https://lore.kernel.org/linux-riscv/[email protected]
Fixes: d95f1a542c3d ("RISC-V: Implement sparsemem")
Reviewed-by: Alexandre Ghiti <[email protected]>
---
arch/riscv/include/asm/pgtable.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 0c94260b5..875c9a079 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -84,7 +84,7 @@
* Define vmemmap for pfn_to_page & page_to_pfn calls. Needed if kernel
* is configured with CONFIG_SPARSEMEM_VMEMMAP enabled.
*/
-#define vmemmap ((struct page *)VMEMMAP_START)
+#define vmemmap ((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT))
#define PCI_IO_SIZE SZ_16M
#define PCI_IO_END VMEMMAP_START
--
2.39.2
Hello:
This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <[email protected]>:
On Thu, 29 Feb 2024 21:17:23 +0200 you wrote:
> Offset vmemmap so that the first page of vmemmap will be mapped
> to the first page of physical memory in order to ensure that
> vmemmap’s bounds will be respected during
> pfn_to_page()/page_to_pfn() operations.
> The conversion macros will produce correct SV39/48/57 addresses
> for every possible/valid DRAM_BASE inside the physical memory limits.
>
> [...]
Here is the summary with links:
- [-fixes,v2] riscv: Sparse-Memory/vmemmap out-of-bounds fix
https://git.kernel.org/riscv/c/a11dd49dcb93
You are awesome, thank you!
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