linux-kernel - [PATCH 5.8 028/124] RISC-V: Make sure memblock reserves the memory containing DT

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Date:   Mon, 12 Oct 2020 15:30:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Atish Patra <atish.patra@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: [PATCH 5.8 028/124] RISC-V: Make sure memblock reserves the memory containing DT

From: Atish Patra <atish.patra@....com>

commit a78c6f5956a949b496a5b087188dde52483edf51 upstream.

Currently, the memory containing DT is not reserved. Thus, that region
of memory can be reallocated or reused for other purposes. This may result
in  corrupted DT for nommu virt board in Qemu. We may not face any issue
in kendryte as DT is embedded in the kernel image for that.

Fixes: 6bd33e1ece52 ("riscv: add nommu support")
Cc: stable@...r.kernel.org
Signed-off-by: Atish Patra <atish.patra@....com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/riscv/mm/init.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -515,6 +515,7 @@ asmlinkage void __init setup_vm(uintptr_
 #else
 	dtb_early_va = (void *)dtb_pa;
 #endif
+	dtb_early_pa = dtb_pa;
 }
 
 static inline void setup_vm_final(void)