[PATCH 54/59] KVM: arm64: nv: Add nested GICv3 tracepoints

Marc Zyngier
2019-06-21T09:40:50Z

From: Christoffer Dall <christoffer.dall@arm.com>

Adding tracepoints to be able to peek into the shadow LRs used when
running a guest guest.

Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
virt/kvm/arm/vgic/vgic-nested-trace.h | 137 ++++++++++++++++++++++++++
virt/kvm/arm/vgic/vgic-v3-nested.c | 12 ++-
2 files changed, 148 insertions(+), 1 deletion(-)
create mode 100644 virt/kvm/arm/vgic/vgic-nested-trace.h

diff --git a/virt/kvm/arm/vgic/vgic-nested-trace.h b/virt/kvm/arm/vgic/vgic-nested-trace.h
new file mode 100644
index 000000000000..69f4ec031e7c
--- /dev/null
+++ b/virt/kvm/arm/vgic/vgic-nested-trace.h
@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#if !defined(_TRACE_VGIC_NESTED_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_VGIC_NESTED_H
+
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm
+
+#define SLR_ENTRY_VALS(x) \
+ " ", \
+ !!(__entry->lrs[x] & ICH_LR_HW), \
+ !!(__entry->lrs[x] & ICH_LR_PENDING_BIT), \
+ !!(__entry->lrs[x] & ICH_LR_ACTIVE_BIT), \
+ __entry->lrs[x] & ICH_LR_VIRTUAL_ID_MASK, \
+ (__entry->lrs[x] & ICH_LR_PHYS_ID_MASK) >> ICH_LR_PHYS_ID_SHIFT, \
+ (__entry->orig_lrs[x] & ICH_LR_PHYS_ID_MASK) >> ICH_LR_PHYS_ID_SHIFT
+
+TRACE_EVENT(vgic_create_shadow_lrs,
+ TP_PROTO(struct kvm_vcpu *vcpu, int nr_lr, u64 *lrs, u64 *orig_lrs),
+ TP_ARGS(vcpu, nr_lr, lrs, orig_lrs),
+
+ TP_STRUCT__entry(
+ __field( int, nr_lr )
+ __array( u64, lrs, 16 )
+ __array( u64, orig_lrs, 16 )
+ ),
+
+ TP_fast_assign(
+ __entry->nr_lr = nr_lr;
+ memcpy(__entry->lrs, lrs, 16 * sizeof(u64));
+ memcpy(__entry->orig_lrs, orig_lrs, 16 * sizeof(u64));
+ ),
+
+ TP_printk("nr_lr: %d\n"
+ "%50sLR[ 0]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 1]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 2]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 3]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 4]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 5]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 6]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 7]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 8]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[ 9]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[10]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[11]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[12]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[13]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[14]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)\n"
+ "%50sLR[15]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu (%5llu)",
+ __entry->nr_lr,
+ SLR_ENTRY_VALS(0), SLR_ENTRY_VALS(1), SLR_ENTRY_VALS(2),
+ SLR_ENTRY_VALS(3), SLR_ENTRY_VALS(4), SLR_ENTRY_VALS(5),
+ SLR_ENTRY_VALS(6), SLR_ENTRY_VALS(7), SLR_ENTRY_VALS(8),
+ SLR_ENTRY_VALS(9), SLR_ENTRY_VALS(10), SLR_ENTRY_VALS(11),
+ SLR_ENTRY_VALS(12), SLR_ENTRY_VALS(13), SLR_ENTRY_VALS(14),
+ SLR_ENTRY_VALS(15))
+);
+
+#define LR_ENTRY_VALS(x) \
+ " ", \
+ !!(__entry->lrs[x] & ICH_LR_HW), \
+ !!(__entry->lrs[x] & ICH_LR_PENDING_BIT), \
+ !!(__entry->lrs[x] & ICH_LR_ACTIVE_BIT), \
+ __entry->lrs[x] & ICH_LR_VIRTUAL_ID_MASK, \
+ (__entry->lrs[x] & ICH_LR_PHYS_ID_MASK) >> ICH_LR_PHYS_ID_SHIFT
+
+TRACE_EVENT(vgic_put_nested,
+ TP_PROTO(struct kvm_vcpu *vcpu, int nr_lr, u64 *lrs),
+ TP_ARGS(vcpu, nr_lr, lrs),
+
+ TP_STRUCT__entry(
+ __field( int, nr_lr )
+ __array( u64, lrs, 16 )
+ ),
+
+ TP_fast_assign(
+ __entry->nr_lr = nr_lr;
+ memcpy(__entry->lrs, lrs, 16 * sizeof(u64));
+ ),
+
+ TP_printk("nr_lr: %d\n"
+ "%50sLR[ 0]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 1]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 2]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 3]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 4]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 5]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 6]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 7]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 8]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[ 9]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[10]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[11]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[12]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[13]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[14]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu\n"
+ "%50sLR[15]: HW: %d P: %d: A: %d vINTID: %5llu pINTID: %5llu",
+ __entry->nr_lr,
+ LR_ENTRY_VALS(0), LR_ENTRY_VALS(1), LR_ENTRY_VALS(2),
+ LR_ENTRY_VALS(3), LR_ENTRY_VALS(4), LR_ENTRY_VALS(5),
+ LR_ENTRY_VALS(6), LR_ENTRY_VALS(7), LR_ENTRY_VALS(8),
+ LR_ENTRY_VALS(9), LR_ENTRY_VALS(10), LR_ENTRY_VALS(11),
+ LR_ENTRY_VALS(12), LR_ENTRY_VALS(13), LR_ENTRY_VALS(14),
+ LR_ENTRY_VALS(15))
+);
+
+TRACE_EVENT(vgic_nested_hw_emulate,
+ TP_PROTO(int lr, u64 lr_val, u32 l1_intid),
+ TP_ARGS(lr, lr_val, l1_intid),
+
+ TP_STRUCT__entry(
+ __field( int, lr )
+ __field( u64, lr_val )
+ __field( u32, l1_intid )
+ ),
+
+ TP_fast_assign(
+ __entry->lr = lr;
+ __entry->lr_val = lr_val;
+ __entry->l1_intid = l1_intid;
+ ),
+
+ TP_printk("lr: %d LR %llx L1 INTID: %u\n",
+ __entry->lr, __entry->lr_val, __entry->l1_intid)
+);
+
+#endif /* _TRACE_VGIC_NESTED_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../../virt/kvm/arm/vgic
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE vgic-nested-trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/virt/kvm/arm/vgic/vgic-v3-nested.c b/virt/kvm/arm/vgic/vgic-v3-nested.c
index 7c5f82ae68e0..ec838b7be6dc 100644
--- a/virt/kvm/arm/vgic/vgic-v3-nested.c
+++ b/virt/kvm/arm/vgic/vgic-v3-nested.c
@@ -13,6 +13,9 @@

#include "vgic.h"

+#define CREATE_TRACE_POINTS
+#include "vgic-nested-trace.h"
+
static inline struct vgic_v3_cpu_if *vcpu_nested_if(struct kvm_vcpu *vcpu)
{
return &vcpu->arch.vgic_cpu.nested_vgic_v3;
@@ -118,6 +121,8 @@ static void vgic_v3_create_shadow_lr(struct kvm_vcpu *vcpu)
s_cpu_if->vgic_lr[i] = lr;
}

+ trace_vgic_create_shadow_lrs(vcpu, kvm_vgic_global_state.nr_lr,
+ s_cpu_if->vgic_lr, cpu_if->vgic_lr);
s_cpu_if->used_lrs = kvm_vgic_global_state.nr_lr;
}

@@ -162,8 +167,10 @@ void vgic_v3_sync_nested(struct kvm_vcpu *vcpu)
continue; /* oh well, the guest hyp is broken */

lr = __gic_v3_get_lr(i);
- if (!(lr & ICH_LR_STATE))
+ if (!(lr & ICH_LR_STATE)) {
+ trace_vgic_nested_hw_emulate(i, lr, l1_irq);
irq->active = false;
+ }

vgic_put_irq(vcpu->kvm, irq);
}
@@ -194,6 +201,9 @@ void vgic_v3_put_nested(struct kvm_vcpu *vcpu)

__vgic_v3_save_state(vcpu_shadow_if(vcpu));

+ trace_vgic_put_nested(vcpu, kvm_vgic_global_state.nr_lr,
+ vcpu_shadow_if(vcpu)->vgic_lr);
+
/*
* Translate the shadow state HW fields back to the virtual ones
* before copying the shadow struct back to the nested one.
--
2.20.1