linux-kernel - [PATCH 7/8] arm64: Define TIF_PATCH

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Message-ID: <20250127213310.2496133-8-wnliu@google.com>
Date: Mon, 27 Jan 2025 21:33:09 +0000
From: Weinan Liu <wnliu@...gle.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, 
	Indu Bhagat <indu.bhagat@...cle.com>, Peter Zijlstra <peterz@...radead.org>
Cc: Mark Rutland <mark.rutland@....com>, roman.gushchin@...ux.dev, 
	Will Deacon <will@...nel.org>, Ian Rogers <irogers@...gle.com>, linux-toolchains@...r.kernel.org, 
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org, 
	joe.lawrence@...hat.com, linux-arm-kernel@...ts.infradead.org, 
	"Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>, 
	Suraj Jitindar Singh <sjitindarsingh@...il.com>, Weinan Liu <wnliu@...gle.com>
Subject: [PATCH 7/8] arm64: Define TIF_PATCH_PENDING for livepatch

From: "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>

	- Define TIF_PATCH_PENDING in arch/arm64/include/asm/thread_info.h
	  for livepatch.

	- Check TIF_PATCH_PENDING in do_notify_resume() to patch the
	  current task for livepatch.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@...il.com>
Signed-off-by: Madhavan T. Venkataraman <madvenka@...ux.microsoft.com>
Signed-off-by: Weinan Liu <wnliu@...gle.com>
---
 arch/arm64/include/asm/thread_info.h | 4 +++-
 arch/arm64/kernel/entry-common.c     | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 1114c1c3300a..3810c2f3914e 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -64,6 +64,7 @@ void arch_setup_new_exec(void);
 #define TIF_UPROBE		4	/* uprobe breakpoint or singlestep */
 #define TIF_MTE_ASYNC_FAULT	5	/* MTE Asynchronous Tag Check Fault */
 #define TIF_NOTIFY_SIGNAL	6	/* signal notifications exist */
+#define TIF_PATCH_PENDING	7	/* pending live patching update */
 #define TIF_SYSCALL_TRACE	8	/* syscall trace active */
 #define TIF_SYSCALL_AUDIT	9	/* syscall auditing */
 #define TIF_SYSCALL_TRACEPOINT	10	/* syscall tracepoint for ftrace */
@@ -99,11 +100,12 @@ void arch_setup_new_exec(void);
 #define _TIF_MTE_ASYNC_FAULT	(1 << TIF_MTE_ASYNC_FAULT)
 #define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
 #define _TIF_TSC_SIGSEGV	(1 << TIF_TSC_SIGSEGV)
+#define _TIF_PATCH_PENDING	(1 << TIF_PATCH_PENDING)
 
 #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
 				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
 				 _TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \
-				 _TIF_NOTIFY_SIGNAL)
+				 _TIF_NOTIFY_SIGNAL | _TIF_PATCH_PENDING)
 
 #define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index b260ddc4d3e9..b537af333b42 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -8,6 +8,7 @@
 #include <linux/context_tracking.h>
 #include <linux/kasan.h>
 #include <linux/linkage.h>
+#include <linux/livepatch.h>
 #include <linux/lockdep.h>
 #include <linux/ptrace.h>
 #include <linux/resume_user_mode.h>
@@ -144,6 +145,9 @@ static void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags)
 				       (void __user *)NULL, current);
 		}
 
+		if (thread_flags & _TIF_PATCH_PENDING)
+			klp_update_patch_state(current);
+
 		if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
 			do_signal(regs);
 
-- 
2.48.1.262.g85cc9f2d1e-goog