This is a note to let you know that I've just added the patch titled
powerpc/watchpoint: Fix handling of vector instructions
to the 5.8-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:
powerpc-watchpoint-fix-handling-of-vector-instructio.patch
and it can be found in the queue-5.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4daa00d0473cca303870e21283ec6a32571986a4
Author: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>
Date: Wed Sep 2 09:59:39 2020 +0530
powerpc/watchpoint: Fix handling of vector instructions
[ Upstream commit 4441eb02333a9b46a0d919aa7a6d3b137b5f2562 ]
Vector load/store instructions are special because they are always
aligned. Thus unaligned EA needs to be aligned down before comparing
it with watch ranges. Otherwise we might consider valid event as
invalid.
Fixes: 74c6881019b7 ("powerpc/watchpoint: Prepare handler to handle more than one watchpoint")
Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200902042945.129369-3-ravi.bangoria@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index f39e86d751144..2190be70c7fd9 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -643,6 +643,8 @@ static void get_instr_detail(struct pt_regs *regs, struct ppc_inst *instr,
if (*type == CACHEOP) {
*size = cache_op_size();
*ea &= ~(*size - 1);
+ } else if (*type == LOAD_VMX || *type == STORE_VMX) {
+ *ea &= ~(*size - 1);
}
}
