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hc
2023-12-09 958e46acc8e900e8569dd467c1af9b8d2d019394 
 kernel/arch/x86/include/asm/thread_info.h
....@@ -95,11 +95,12 @@
9595 #define TIF_USER_RETURN_NOTIFY	11	/* notify kernel of userspace return */
9696 #define TIF_UPROBE		12	/* breakpointed or singlestepping */
9797 #define TIF_PATCH_PENDING	13	/* pending live patching update */
98
+#define TIF_NEED_FPU_LOAD	14	/* load FPU on return to userspace */
9899 #define TIF_NOCPUID		15	/* CPUID is not accessible in userland */
99100 #define TIF_NOTSC		16	/* TSC is not accessible in userland */
100101 #define TIF_IA32		17	/* IA32 compatibility process */
101
-#define TIF_NEED_RESCHED_LAZY	18	/* lazy rescheduling necessary */
102
-#define TIF_NOHZ		19	/* in adaptive nohz mode */
102
+#define TIF_SLD			18	/* Restore split lock detection on context switch */
103
+#define TIF_NOTIFY_SIGNAL	19	/* signal notifications exist */
103104 #define TIF_MEMDIE		20	/* is terminating due to OOM killer */
104105 #define TIF_POLLING_NRFLAG	21	/* idle is polling for TIF_NEED_RESCHED */
105106 #define TIF_IO_BITMAP		22	/* uses I/O bitmap */
....@@ -109,7 +110,7 @@
109110 #define TIF_SYSCALL_TRACEPOINT	28	/* syscall tracepoint instrumentation */
110111 #define TIF_ADDR32		29	/* 32-bit address space on 64 bits */
111112 #define TIF_X32			30	/* 32-bit native x86-64 binary */
112
-#define TIF_FSCHECK		31	/* Check FS is USER_DS on return */
113
+#define TIF_NEED_RESCHED_LAZY	31	/* lazy rescheduling necessary */
113114 
114115 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
115116 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
....@@ -125,11 +126,13 @@
125126 #define _TIF_USER_RETURN_NOTIFY	(1 << TIF_USER_RETURN_NOTIFY)
126127 #define _TIF_UPROBE		(1 << TIF_UPROBE)
127128 #define _TIF_PATCH_PENDING	(1 << TIF_PATCH_PENDING)
129
+#define _TIF_NEED_FPU_LOAD	(1 << TIF_NEED_FPU_LOAD)
128130 #define _TIF_NOCPUID		(1 << TIF_NOCPUID)
129131 #define _TIF_NOTSC		(1 << TIF_NOTSC)
130132 #define _TIF_IA32		(1 << TIF_IA32)
133
+#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
134
+#define _TIF_SLD		(1 << TIF_SLD)
131135 #define _TIF_NEED_RESCHED_LAZY	(1 << TIF_NEED_RESCHED_LAZY)
132
-#define _TIF_NOHZ		(1 << TIF_NOHZ)
133136 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
134137 #define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
135138 #define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
....@@ -138,29 +141,11 @@
138141 #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
139142 #define _TIF_ADDR32		(1 << TIF_ADDR32)
140143 #define _TIF_X32		(1 << TIF_X32)
141
-#define _TIF_FSCHECK		(1 << TIF_FSCHECK)
142
-
143
-/*
144
- * work to do in syscall_trace_enter().  Also includes TIF_NOHZ for
145
- * enter_from_user_mode()
146
- */
147
-#define _TIF_WORK_SYSCALL_ENTRY	\
148
-	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT |	\
149
-	 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT |	\
150
-	 _TIF_NOHZ)
151
-
152
-/* work to do on any return to user space */
153
-#define _TIF_ALLWORK_MASK						\
154
-	(_TIF_SYSCALL_TRACE | _TIF_NOTIFY_RESUME | _TIF_SIGPENDING |	\
155
-	 _TIF_NEED_RESCHED | _TIF_SINGLESTEP | _TIF_SYSCALL_EMU |	\
156
-	 _TIF_SYSCALL_AUDIT | _TIF_USER_RETURN_NOTIFY | _TIF_UPROBE |	\
157
-	 _TIF_PATCH_PENDING | _TIF_NOHZ | _TIF_SYSCALL_TRACEPOINT |	\
158
-	 _TIF_FSCHECK)
159144 
160145 /* flags to check in __switch_to() */
161
-#define _TIF_WORK_CTXSW_BASE						\
162
-	(_TIF_IO_BITMAP|_TIF_NOCPUID|_TIF_NOTSC|_TIF_BLOCKSTEP|		\
163
-	 _TIF_SSBD | _TIF_SPEC_FORCE_UPDATE)
146
+#define _TIF_WORK_CTXSW_BASE					\
147
+	(_TIF_NOCPUID | _TIF_NOTSC | _TIF_BLOCKSTEP |		\
148
+	 _TIF_SSBD | _TIF_SPEC_FORCE_UPDATE | _TIF_SLD)
164149 
165150 /*
166151  * Avoid calls to __switch_to_xtra() on UP as STIBP is not evaluated.
....@@ -171,8 +156,14 @@
171156 # define _TIF_WORK_CTXSW	(_TIF_WORK_CTXSW_BASE)
172157 #endif
173158 
174
-#define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
175
-#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW)
159
+#ifdef CONFIG_X86_IOPL_IOPERM
160
+# define _TIF_WORK_CTXSW_PREV	(_TIF_WORK_CTXSW| _TIF_USER_RETURN_NOTIFY | \
161
+				 _TIF_IO_BITMAP)
162
+#else
163
+# define _TIF_WORK_CTXSW_PREV	(_TIF_WORK_CTXSW| _TIF_USER_RETURN_NOTIFY)
164
+#endif
165
+
166
+#define _TIF_WORK_CTXSW_NEXT	(_TIF_WORK_CTXSW)
176167 
177168 #define _TIF_NEED_RESCHED_MASK	(_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
178169 
....@@ -270,15 +261,6 @@
270261 #define in_ia32_syscall() (IS_ENABLED(CONFIG_IA32_EMULATION) && \
271262 			   current_thread_info()->status & TS_COMPAT)
272263 #endif
273
-
274
-/*
275
- * Force syscall return via IRET by making it look as if there was
276
- * some work pending. IRET is our most capable (but slowest) syscall
277
- * return path, which is able to restore modified SS, CS and certain
278
- * EFLAGS values that other (fast) syscall return instructions
279
- * are not able to restore properly.
280
- */
281
-#define force_iret() set_thread_flag(TIF_NOTIFY_RESUME)
282264 
283265 extern void arch_task_cache_init(void);
284266 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);