KVM: MMU: Trace guest pagetable walker

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
new file mode 100644
index 000000000000..1367f82717d1
--- /dev/null
+++ b/arch/x86/kvm/mmutrace.h
@@ -0,0 +1,117 @@
+#if !defined(_TRACE_KVMMMU_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_KVMMMU_H
+
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvmmmu
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE mmutrace
+
+#define kvm_mmu_trace_pferr_flags       \
+        { PFERR_PRESENT_MASK, "P" },    \
+        { PFERR_WRITE_MASK, "W" },      \
+        { PFERR_USER_MASK, "U" },       \
+        { PFERR_RSVD_MASK, "RSVD" },    \
+        { PFERR_FETCH_MASK, "F" }
+
+/*
+ * A pagetable walk has started
+ */
+TRACE_EVENT(
+        kvm_mmu_pagetable_walk,
+        TP_PROTO(u64 addr, int write_fault, int user_fault, int fetch_fault),
+        TP_ARGS(addr, write_fault, user_fault, fetch_fault),
+
+        TP_STRUCT__entry(
+                __field(__u64, addr)
+                __field(__u32, pferr)
+        ),
+
+        TP_fast_assign(
+                __entry->addr = addr;
+                __entry->pferr = (!!write_fault << 1) | (!!user_fault << 2)
+                                 | (!!fetch_fault << 4);
+        ),
+
+        TP_printk("addr %llx pferr %x %s", __entry->addr, __entry->pferr,
+                  __print_flags(__entry->pferr, "|", kvm_mmu_trace_pferr_flags))
+);
+
+
+/* We just walked a paging element */
+TRACE_EVENT(
+        kvm_mmu_paging_element,
+        TP_PROTO(u64 pte, int level),
+        TP_ARGS(pte, level),
+
+        TP_STRUCT__entry(
+                __field(__u64, pte)
+                __field(__u32, level)
+                ),
+
+        TP_fast_assign(
+                __entry->pte = pte;
+                __entry->level = level;
+                ),
+
+        TP_printk("pte %llx level %u", __entry->pte, __entry->level)
+);
+
+/* We set a pte accessed bit */
+TRACE_EVENT(
+        kvm_mmu_set_accessed_bit,
+        TP_PROTO(unsigned long table_gfn, unsigned index, unsigned size),
+        TP_ARGS(table_gfn, index, size),
+
+        TP_STRUCT__entry(
+                __field(__u64, gpa)
+                ),
+
+        TP_fast_assign(
+                __entry->gpa = ((u64)table_gfn << PAGE_SHIFT)
+                                + index * size;
+                ),
+
+        TP_printk("gpa %llx", __entry->gpa)
+);
+
+/* We set a pte dirty bit */
+TRACE_EVENT(
+        kvm_mmu_set_dirty_bit,
+        TP_PROTO(unsigned long table_gfn, unsigned index, unsigned size),
+        TP_ARGS(table_gfn, index, size),
+
+        TP_STRUCT__entry(
+                __field(__u64, gpa)
+                ),
+
+        TP_fast_assign(
+                __entry->gpa = ((u64)table_gfn << PAGE_SHIFT)
+                                + index * size;
+                ),
+
+        TP_printk("gpa %llx", __entry->gpa)
+);
+
+TRACE_EVENT(
+        kvm_mmu_walker_error,
+        TP_PROTO(u32 pferr),
+        TP_ARGS(pferr),
+
+        TP_STRUCT__entry(
+                __field(__u32, pferr)
+                ),
+
+        TP_fast_assign(
+                __entry->pferr = pferr;
+                ),
+
+        TP_printk("pferr %x %s", __entry->pferr,
+                  __print_flags(__entry->pferr, "|", kvm_mmu_trace_pferr_flags))
+);
+
+#endif /* _TRACE_KVMMMU_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>