cachepc

commit c1f2064fda3711db4878376884c36979c7b470cc
parent 32331c7f421411bccb87ea818a2a0198b8cf88aa
Author: Louis Burda <quent.burda@gmail.com>
Date:   Tue,  7 Feb 2023 08:26:00 -0600

Add counter for L1 misses in guest

Diffstat:
M
cachepc/cachepc.h
 | 
3
+++
M
cachepc/const.h
 | 
1
+
M
cachepc/event.c
 | 
7
+++++--
M
cachepc/event.h
 | 
5
+++--
M
cachepc/kvm.c
 | 
16
+++++++++++++---
M
cachepc/uapi.h
 | 
1
+
M
test/kvm-step.c
 | 
4
++--
M
util/disasm
 | 
7
++++---

8 files changed, 32 insertions(+), 12 deletions(-)
diff --git a/cachepc/cachepc.h b/cachepc/cachepc.h
@@ -104,6 +104,9 @@ extern uint8_t *cpc_baseline;
 extern bool cpc_baseline_measure;
 extern bool cpc_baseline_active;
 
+extern uint32_t cpc_guest_misses;
+extern uint32_t cpc_baseline_guest_misses;
+
 extern uint32_t cpc_svm_exitcode;
 
 extern bool cpc_pause_vm;
diff --git a/cachepc/const.h b/cachepc/const.h
@@ -11,6 +11,7 @@
 #define CPC_L1MISS_PMC 0
 #define CPC_RETINST_PMC 1
 #define CPC_RETINST_USER_PMC 2
+#define CPC_L1MISS_GUEST_PMC 3
 
 #define CPC_VMSA_MAGIC_ADDR ((void *) 0xC0FFEE)
 
diff --git a/cachepc/event.c b/cachepc/event.c
@@ -155,7 +155,7 @@ cpc_send_pause_event(void)
 }
 
 int
-cpc_send_track_step_event(struct list_head *list)
+cpc_send_track_step_event(struct list_head *list, uint32_t guest_misses)
 {
 	struct cpc_event event = { 0 };
 	struct cpc_fault *fault;
@@ -174,6 +174,7 @@ cpc_send_track_step_event(struct list_head *list)
 	}
 	event.step.fault_count = count;
 	event.step.retinst = cpc_retinst;
+	event.step.misses = guest_misses;
 
 	return cpc_send_event(event);
 }
@@ -195,7 +196,8 @@ cpc_send_track_page_event(uint64_t gfn_prev, uint64_t gfn, uint16_t err,
 }
 
 int
-cpc_send_track_step_event_single(uint64_t gfn, uint32_t err, uint64_t retinst)
+cpc_send_track_step_event_single(uint64_t gfn, uint32_t err,
+	uint64_t retinst, uint32_t guest_misses)
 {
 	struct cpc_event event = { 0 };
 
@@ -205,6 +207,7 @@ cpc_send_track_step_event_single(uint64_t gfn, uint32_t err, uint64_t retinst)
 	event.step.fault_errs[0] = err;
 	event.step.inst_gfn = gfn;
 	event.step.retinst = retinst;
+	event.step.misses = guest_misses;
 
 	return cpc_send_event(event);
 }
diff --git a/cachepc/event.h b/cachepc/event.h
@@ -18,8 +18,9 @@ void cpc_events_skip(void);
 
 int cpc_send_guest_event(uint64_t type, uint64_t val);
 int cpc_send_pause_event(void);
-int cpc_send_track_step_event(struct list_head *list);
-int cpc_send_track_step_event_single(uint64_t gfn, uint32_t err, uint64_t retinst);
+int cpc_send_track_step_event(struct list_head *list, uint32_t guest_misses);
+int cpc_send_track_step_event_single(uint64_t gfn, uint32_t err,
+	uint64_t retinst, uint32_t guest_misses);
 int cpc_send_track_page_event(uint64_t gfn_prev, uint64_t gfn, uint16_t err,
 	uint64_t retinst, uint64_t retinst_user);
 
diff --git a/cachepc/kvm.c b/cachepc/kvm.c
@@ -22,15 +22,19 @@ uint32_t cpc_loglevel = 0;
 EXPORT_SYMBOL(cpc_loglevel);
 
 uint8_t *cpc_msrmts = NULL;
-EXPORT_SYMBOL(cpc_msrmts);
-
 uint8_t *cpc_baseline = NULL;
 bool cpc_baseline_measure = false;
 bool cpc_baseline_active = false;
+EXPORT_SYMBOL(cpc_msrmts);
 EXPORT_SYMBOL(cpc_baseline);
 EXPORT_SYMBOL(cpc_baseline_measure);
 EXPORT_SYMBOL(cpc_baseline_active);
 
+uint32_t cpc_guest_misses = 0;
+uint32_t cpc_baseline_guest_misses = 0;
+EXPORT_SYMBOL(cpc_guest_misses);
+EXPORT_SYMBOL(cpc_baseline_guest_misses);
+
 uint32_t cpc_svm_exitcode = false;
 EXPORT_SYMBOL(cpc_svm_exitcode);
 
@@ -240,11 +244,16 @@ cpc_pmc_setup(void *p)
 
 	/* retired instructions in guest */
 	cpc_init_pmc(CPC_RETINST_PMC, 0xC0, 0x00,
-		PMC_GUEST, PMC_KERNEL | PMC_USER);
+		PMC_GUEST, PMC_USER | PMC_KERNEL);
 
 	/* retired instructions in guest userspace */
 	cpc_init_pmc(CPC_RETINST_USER_PMC, 0xC0, 0x00,
 		PMC_GUEST, PMC_USER);
+
+	/* L1 misses in guest */
+	cpc_init_pmc(CPC_L1MISS_GUEST_PMC, 0x64, 0xD8,
+		PMC_GUEST, PMC_USER | PMC_KERNEL);
+
 }
 
 void
@@ -377,6 +386,7 @@ cpc_reset_baseline_ioctl(void __user *arg_user)
 	cpc_baseline_active = false;
 	cpc_baseline_measure = false;
 	memset(cpc_baseline, 0xff, L1_SETS);
+	cpc_baseline_guest_misses = 0xffffffff;
 
 	return 0;
 }
diff --git a/cachepc/uapi.h b/cachepc/uapi.h
@@ -82,6 +82,7 @@ struct cpc_track_step_event {
 	__u64 fault_count;
 	__u64 inst_gfn;
 	__u64 retinst;
+	__u32 misses;
 };
 
 struct cpc_track_page_event {
diff --git a/test/kvm-step.c b/test/kvm-step.c
@@ -34,10 +34,10 @@ monitor(struct kvm *kvm, bool baseline)
 	ret = ioctl(kvm_dev, KVM_CPC_READ_COUNTS, counts);
 	if (ret) err(1, "KVM_CPC_READ_COUNTS");
 
-	printf("Event: rip:%08llx cnt:%llu inst:%08llx data:%08llx ret:%llu\n",
+	printf("Event: rip:%08llx cnt:%llu inst:%08llx data:%08llx ret:%llu misses:%u\n",
 		vm_get_rip(), event.step.fault_count,
 		event.step.fault_gfns[0], event.step.fault_gfns[1],
-		event.step.retinst);
+		event.step.retinst, event.step.misses);
 	print_counts(counts);
 	printf("\n");
 	print_counts_raw(counts);
diff --git a/util/disasm b/util/disasm
@@ -5,9 +5,10 @@ if [ $# -lt 2 ]; then
 	exit 1
 fi
 
-ARCH="i386"
 if [ "$2" = "guest" ]; then
-	ARCH="i8086"
+	objdump -D -b binary -m i8086 $1
+else
+	objdump -b binary -m i8086 --disassemble="$2" $1
 fi
 
-gdb --batch -ex "set architecture $ARCH" -ex "disassemble $2" $1
+