[PATCH 5.10 21/42] riscv: Sparse-Memory/vmemmap out-of-bounds fix

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dimitris Vlachos <dvlachos@xxxxxxxxxxxx>

[ Upstream commit a11dd49dcb9376776193e15641f84fcc1e5980c9 ]

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 <alexghiti@xxxxxxxxxxxx>
Signed-off-by: Dimitris Vlachos <dvlachos@xxxxxxxxxxxx>
Reported-by: Dimitris Vlachos <dvlachos@xxxxxxxxxxxx>
Closes: https://lore.kernel.org/linux-riscv/20240202135030.42265-1-csd4492@xxxxxxxxxx
Fixes: d95f1a542c3d ("RISC-V: Implement sparsemem")
Reviewed-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240229191723.32779-1-dvlachos@xxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 b16304fdf4489..5ab13570daa53 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -44,7 +44,7 @@
  * 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
-- 
2.43.0







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