This is a note to let you know that I've just added the patch titled
riscv: Fix enabling cbo.zero when running in M-mode
to the 6.7-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-fix-enabling-cbo.zero-when-running-in-m-mode.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3fb3f7164edc467450e650dca51dbe4823315a56 Mon Sep 17 00:00:00 2001
From: Samuel Holland <samuel.holland@xxxxxxxxxx>
Date: Tue, 27 Feb 2024 22:55:33 -0800
Subject: riscv: Fix enabling cbo.zero when running in M-mode
From: Samuel Holland <samuel.holland@xxxxxxxxxx>
commit 3fb3f7164edc467450e650dca51dbe4823315a56 upstream.
When the kernel is running in M-mode, the CBZE bit must be set in the
menvcfg CSR, not in senvcfg.
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 43c16d51a19b ("RISC-V: Enable cbo.zero in usermode")
Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240228065559.3434837-2-samuel.holland@xxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/riscv/include/asm/csr.h | 2 ++
arch/riscv/kernel/cpufeature.c | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -415,6 +415,7 @@
# define CSR_STATUS CSR_MSTATUS
# define CSR_IE CSR_MIE
# define CSR_TVEC CSR_MTVEC
+# define CSR_ENVCFG CSR_MENVCFG
# define CSR_SCRATCH CSR_MSCRATCH
# define CSR_EPC CSR_MEPC
# define CSR_CAUSE CSR_MCAUSE
@@ -439,6 +440,7 @@
# define CSR_STATUS CSR_SSTATUS
# define CSR_IE CSR_SIE
# define CSR_TVEC CSR_STVEC
+# define CSR_ENVCFG CSR_SENVCFG
# define CSR_SCRATCH CSR_SSCRATCH
# define CSR_EPC CSR_SEPC
# define CSR_CAUSE CSR_SCAUSE
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -740,7 +740,7 @@ arch_initcall(check_unaligned_access_all
void riscv_user_isa_enable(void)
{
if (riscv_cpu_has_extension_unlikely(smp_processor_id(), RISCV_ISA_EXT_ZICBOZ))
- csr_set(CSR_SENVCFG, ENVCFG_CBZE);
+ csr_set(CSR_ENVCFG, ENVCFG_CBZE);
}
#ifdef CONFIG_RISCV_ALTERNATIVE
Patches currently in stable-queue which might be from samuel.holland@xxxxxxxxxx are
queue-6.7/riscv-fix-enabling-cbo.zero-when-running-in-m-mode.patch
queue-6.7/riscv-save-restore-envcfg-csr-during-cpu-suspend.patch
