This is a note to let you know that I've just added the patch titled
riscv: set trap vector earlier
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
riscv-set-trap-vector-earlier.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 655d57c68b7b3fdd872ff40102e2a065eb5613d9
Author: yang.zhang <yang.zhang@xxxxxxxxxxxx>
Date: Wed May 8 10:24:45 2024 +0800
riscv: set trap vector earlier
[ Upstream commit 6ad8735994b854b23c824dd6b1dd2126e893a3b4 ]
The exception vector of the booting hart is not set before enabling
the mmu and then still points to the value of the previous firmware,
typically _start. That makes it hard to debug setup_vm() when bad
things happen. So fix that by setting the exception vector earlier.
Reviewed-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>
Signed-off-by: yang.zhang <yang.zhang@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240508022445.6131-1-gaoshanliukou@xxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index 0097c145385f..9691fa8f2faa 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -305,6 +305,9 @@ clear_bss_done:
#else
mv a0, a1
#endif /* CONFIG_BUILTIN_DTB */
+ /* Set trap vector to spin forever to help debug */
+ la a3, .Lsecondary_park
+ csrw CSR_TVEC, a3
call setup_vm
#ifdef CONFIG_MMU
la a0, early_pg_dir
