From: "tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: x86/core] x86/calldepth: Add ret/call counting for debug
Date: Mon, 17 Oct 2022 14:53:37 -0000 [thread overview]
Message-ID: <166601841738.401.8846324922900036711.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20220915111148.204285506@infradead.org>
The following commit has been merged into the x86/core branch of tip:
Commit-ID: f5c1bb2afe93396d41c5cbdcb909b08a75b8dde4
Gitweb: https://git.kernel.org/tip/f5c1bb2afe93396d41c5cbdcb909b08a75b8dde4
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Thu, 15 Sep 2022 13:11:30 +02:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Mon, 17 Oct 2022 16:41:16 +02:00
x86/calldepth: Add ret/call counting for debug
Add a debuigfs mechanism to validate the accounting, e.g. vs. call/ret
balance and to gather statistics about the stuffing to call ratio.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111148.204285506@infradead.org
---
arch/x86/include/asm/nospec-branch.h | 36 ++++++++++++++++--
arch/x86/kernel/callthunks.c | 53 +++++++++++++++++++++++++++-
arch/x86/lib/retpoline.S | 7 +++-
3 files changed, 91 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 06ba7ca..4771147 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -57,6 +57,22 @@
#define RET_DEPTH_INIT_FROM_CALL 0xfc00000000000000ULL
#define RET_DEPTH_CREDIT 0xffffffffffffffffULL
+#ifdef CONFIG_CALL_THUNKS_DEBUG
+# define CALL_THUNKS_DEBUG_INC_CALLS \
+ incq %gs:__x86_call_count;
+# define CALL_THUNKS_DEBUG_INC_RETS \
+ incq %gs:__x86_ret_count;
+# define CALL_THUNKS_DEBUG_INC_STUFFS \
+ incq %gs:__x86_stuffs_count;
+# define CALL_THUNKS_DEBUG_INC_CTXSW \
+ incq %gs:__x86_ctxsw_count;
+#else
+# define CALL_THUNKS_DEBUG_INC_CALLS
+# define CALL_THUNKS_DEBUG_INC_RETS
+# define CALL_THUNKS_DEBUG_INC_STUFFS
+# define CALL_THUNKS_DEBUG_INC_CTXSW
+#endif
+
#if defined(CONFIG_CALL_DEPTH_TRACKING) && !defined(COMPILE_OFFSETS)
#include <asm/asm-offsets.h>
@@ -75,18 +91,23 @@
#define RESET_CALL_DEPTH_FROM_CALL \
mov $0xfc, %rax; \
shl $56, %rax; \
- movq %rax, PER_CPU_VAR(pcpu_hot + X86_call_depth);
+ movq %rax, PER_CPU_VAR(pcpu_hot + X86_call_depth); \
+ CALL_THUNKS_DEBUG_INC_CALLS
#define INCREMENT_CALL_DEPTH \
- sarq $5, %gs:pcpu_hot + X86_call_depth;
+ sarq $5, %gs:pcpu_hot + X86_call_depth; \
+ CALL_THUNKS_DEBUG_INC_CALLS
#define ASM_INCREMENT_CALL_DEPTH \
- sarq $5, PER_CPU_VAR(pcpu_hot + X86_call_depth);
+ sarq $5, PER_CPU_VAR(pcpu_hot + X86_call_depth); \
+ CALL_THUNKS_DEBUG_INC_CALLS
#else
#define CREDIT_CALL_DEPTH
+#define ASM_CREDIT_CALL_DEPTH
#define RESET_CALL_DEPTH
#define INCREMENT_CALL_DEPTH
+#define ASM_INCREMENT_CALL_DEPTH
#define RESET_CALL_DEPTH_FROM_CALL
#endif
@@ -137,7 +158,8 @@
jnz 771b; \
/* barrier for jnz misprediction */ \
lfence; \
- ASM_CREDIT_CALL_DEPTH
+ ASM_CREDIT_CALL_DEPTH \
+ CALL_THUNKS_DEBUG_INC_CTXSW
#else
/*
* i386 doesn't unconditionally have LFENCE, as such it can't
@@ -321,6 +343,12 @@ static inline void x86_set_skl_return_thunk(void)
{
x86_return_thunk = &__x86_return_skl;
}
+#ifdef CONFIG_CALL_THUNKS_DEBUG
+DECLARE_PER_CPU(u64, __x86_call_count);
+DECLARE_PER_CPU(u64, __x86_ret_count);
+DECLARE_PER_CPU(u64, __x86_stuffs_count);
+DECLARE_PER_CPU(u64, __x86_ctxsw_count);
+#endif
#else
static inline void x86_set_skl_return_thunk(void) {}
#endif
diff --git a/arch/x86/kernel/callthunks.c b/arch/x86/kernel/callthunks.c
index 01f6f6b..dfe7fff 100644
--- a/arch/x86/kernel/callthunks.c
+++ b/arch/x86/kernel/callthunks.c
@@ -2,6 +2,7 @@
#define pr_fmt(fmt) "callthunks: " fmt
+#include <linux/debugfs.h>
#include <linux/kallsyms.h>
#include <linux/memory.h>
#include <linux/moduleloader.h>
@@ -35,6 +36,15 @@ static int __init debug_thunks(char *str)
}
__setup("debug-callthunks", debug_thunks);
+#ifdef CONFIG_CALL_THUNKS_DEBUG
+DEFINE_PER_CPU(u64, __x86_call_count);
+DEFINE_PER_CPU(u64, __x86_ret_count);
+DEFINE_PER_CPU(u64, __x86_stuffs_count);
+DEFINE_PER_CPU(u64, __x86_ctxsw_count);
+EXPORT_SYMBOL_GPL(__x86_ctxsw_count);
+EXPORT_SYMBOL_GPL(__x86_call_count);
+#endif
+
extern s32 __call_sites[], __call_sites_end[];
struct thunk_desc {
@@ -283,3 +293,46 @@ void noinline callthunks_patch_module_calls(struct callthunk_sites *cs,
mutex_unlock(&text_mutex);
}
#endif /* CONFIG_MODULES */
+
+#if defined(CONFIG_CALL_THUNKS_DEBUG) && defined(CONFIG_DEBUG_FS)
+static int callthunks_debug_show(struct seq_file *m, void *p)
+{
+ unsigned long cpu = (unsigned long)m->private;
+
+ seq_printf(m, "C: %16llu R: %16llu S: %16llu X: %16llu\n,",
+ per_cpu(__x86_call_count, cpu),
+ per_cpu(__x86_ret_count, cpu),
+ per_cpu(__x86_stuffs_count, cpu),
+ per_cpu(__x86_ctxsw_count, cpu));
+ return 0;
+}
+
+static int callthunks_debug_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, callthunks_debug_show, inode->i_private);
+}
+
+static const struct file_operations dfs_ops = {
+ .open = callthunks_debug_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init callthunks_debugfs_init(void)
+{
+ struct dentry *dir;
+ unsigned long cpu;
+
+ dir = debugfs_create_dir("callthunks", NULL);
+ for_each_possible_cpu(cpu) {
+ void *arg = (void *)cpu;
+ char name [10];
+
+ sprintf(name, "cpu%lu", cpu);
+ debugfs_create_file(name, 0644, dir, arg, &dfs_ops);
+ }
+ return 0;
+}
+__initcall(callthunks_debugfs_init);
+#endif
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index e002060..5f61c65 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -203,13 +203,18 @@ EXPORT_SYMBOL(__x86_return_thunk)
.align 64
SYM_FUNC_START(__x86_return_skl)
ANNOTATE_NOENDBR
- /* Keep the hotpath in a 16byte I-fetch */
+ /*
+ * Keep the hotpath in a 16byte I-fetch for the non-debug
+ * case.
+ */
+ CALL_THUNKS_DEBUG_INC_RETS
shlq $5, PER_CPU_VAR(pcpu_hot + X86_call_depth)
jz 1f
ANNOTATE_UNRET_SAFE
ret
int3
1:
+ CALL_THUNKS_DEBUG_INC_STUFFS
.rept 16
ANNOTATE_INTRA_FUNCTION_CALL
call 2f
next prev parent reply other threads:[~2022-10-17 14:54 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-15 11:10 [PATCH v3 00/59] x86/retbleed: Call depth tracking mitigation Peter Zijlstra
2022-09-15 11:10 ` [PATCH v3 01/59] x86/paravirt: Ensure proper alignment Peter Zijlstra
2022-09-21 11:08 ` [tip: x86/paravirt] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 02/59] x86/cpu: Remove segment load from switch_to_new_gdt() Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 03/59] x86/cpu: Get rid of redundant switch_to_new_gdt() invocations Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 04/59] x86/cpu: Re-enable stackprotector Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 05/59] x86/modules: Set VM_FLUSH_RESET_PERMS in module_alloc() Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 06/59] x86/vdso: Ensure all kernel code is seen by objtool Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 07/59] x86: Sanitize linker script Peter Zijlstra
2022-10-07 16:03 ` Borislav Petkov
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 08/59] arch: Introduce CONFIG_FUNCTION_ALIGNMENT Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:10 ` [PATCH v3 09/59] x86/asm: Differentiate between code and function alignment Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 10/59] x86/error_inject: Align function properly Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:10 ` [PATCH v3 11/59] x86/paravirt: Properly align PV functions Peter Zijlstra
2022-09-15 14:34 ` Juergen Gross
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 12/59] x86/entry: Align SYM_CODE_START() variants Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 13/59] crypto: x86/camellia: Remove redundant alignments Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 14/59] crypto: x86/cast5: " Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 15/59] crypto: x86/crct10dif-pcl: " Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 16/59] crypto: x86/serpent: " Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 17/59] crypto: x86/sha1: Remove custom alignments Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 18/59] crypto: x86/sha256: " Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 19/59] crypto: x86/sm[34]: Remove redundant alignments Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:10 ` [PATCH v3 20/59] crypto: twofish: " Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 21/59] crypto: x86/poly1305: Remove custom function alignment Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 22/59] x86: Put hot per CPU variables into a struct Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 23/59] x86/percpu: Move preempt_count next to current_task Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 24/59] x86/percpu: Move cpu_number " Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 25/59] x86/percpu: Move current_top_of_stack " Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 26/59] x86/percpu: Move irq_stack variables " Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 27/59] x86/softirq: Move softirq pending next to current task Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 28/59] objtool: Allow !PC relative relocations Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 29/59] objtool: Track init section Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 30/59] objtool: Add .call_sites section Peter Zijlstra
2022-10-17 14:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 31/59] objtool: Add --hacks=skylake Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 32/59] objtool: Allow STT_NOTYPE -> STT_FUNC+0 tail-calls Peter Zijlstra
2022-09-22 5:27 ` Pawan Gupta
2022-09-22 10:29 ` Peter Zijlstra
2022-09-22 10:47 ` Peter Zijlstra
2022-09-22 13:15 ` Peter Zijlstra
2022-09-23 14:35 ` Peter Zijlstra
2022-09-23 17:36 ` Pawan Gupta
2022-09-15 11:11 ` [PATCH v3 33/59] objtool: Fix find_{symbol,func}_containing() Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 34/59] objtool: Allow symbol range comparisons for IBT/ENDBR Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 35/59] x86/entry: Make sync_regs() invocation a tail call Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 36/59] ftrace: Add HAVE_DYNAMIC_FTRACE_NO_PATCHABLE Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 37/59] x86/putuser: Provide room for padding Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 38/59] x86/Kconfig: Add CONFIG_CALL_THUNKS Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 39/59] x86/Kconfig: Introduce function padding Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 40/59] x86/retbleed: Add X86_FEATURE_CALL_DEPTH Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 41/59] x86/alternatives: Provide text_poke_copy_locked() Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 42/59] x86/entry: Make some entry symbols global Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 43/59] x86/paravirt: Make struct paravirt_call_site unconditionally available Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 44/59] x86/callthunks: Add call patching for call depth tracking Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 45/59] x86/modules: Add call patching Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 46/59] x86/returnthunk: Allow different return thunks Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 47/59] x86/asm: Provide ALTERNATIVE_3 Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 48/59] x86/retbleed: Add SKL return thunk Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-10-20 23:10 ` [PATCH v3 48/59] " Nathan Chancellor
2022-10-21 9:53 ` Peter Zijlstra
2022-10-21 15:21 ` Nathan Chancellor
2022-11-03 22:53 ` KVM vs AMD: " Andrew Cooper
2022-11-04 12:44 ` Peter Zijlstra
2022-11-04 15:29 ` Andrew Cooper
2022-11-04 15:32 ` Nathan Chancellor
2022-11-07 9:37 ` Paolo Bonzini
2022-09-15 11:11 ` [PATCH v3 49/59] x86/retpoline: Add SKL retthunk retpolines Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 50/59] x86/retbleed: Add SKL call thunk Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2022-09-15 11:11 ` [PATCH v3 51/59] x86/calldepth: Add ret/call counting for debug Peter Zijlstra
2022-10-17 14:53 ` tip-bot2 for Thomas Gleixner [this message]
2022-09-15 11:11 ` [PATCH v3 52/59] static_call: Add call depth tracking support Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 53/59] kallsyms: Take callthunks into account Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 54/59] x86/orc: Make it callthunk aware Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 55/59] x86/bpf: Emit call depth accounting if required Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
2023-01-05 21:49 ` [PATCH v3 55/59] " Joan Bruguera
2022-09-15 11:11 ` [PATCH v3 56/59] x86/ftrace: Remove ftrace_epilogue() Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-10-20 15:17 ` [tip: x86/urgent] " tip-bot2 for Peter Zijlstra
2022-12-09 15:41 ` [PATCH v3 56/59] " Steven Rostedt
2022-09-15 11:11 ` [PATCH v3 57/59] x86/ftrace: Rebalance RSB Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 58/59] x86/ftrace: Make it call depth tracking aware Peter Zijlstra
2022-09-21 10:19 ` [PATCH v3.1 " Peter Zijlstra
2022-09-21 18:45 ` Pawan Gupta
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2022-09-15 11:11 ` [PATCH v3 59/59] x86/retbleed: Add call depth tracking mitigation Peter Zijlstra
2022-10-17 14:53 ` [tip: x86/core] " tip-bot2 for Thomas Gleixner
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