KVM: kvmtrace: Remove use of bit fields in kvm trace structure
This patch fixes kvmtrace use on big endian systems. When using bit fields the
compiler will lay data out in the wrong order expected when laid down into a
file.
This fixes it by using one variable instead of using bit fields.
Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 8a3cead..8a16b08 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -311,9 +311,13 @@
/* This structure represents a single trace buffer record. */
struct kvm_trace_rec {
- __u32 event:28;
- __u32 extra_u32:3;
- __u32 cycle_in:1;
+ /* variable rec_val
+ * is split into:
+ * bits 0 - 27 -> event id
+ * bits 28 -30 -> number of extra data args of size u32
+ * bits 31 -> binary indicator for if tsc is in record
+ */
+ __u32 rec_val;
__u32 pid;
__u32 vcpu_id;
union {
@@ -327,6 +331,13 @@
} u;
};
+#define TRACE_REC_EVENT_ID(val) \
+ (0x0fffffff & (val))
+#define TRACE_REC_NUM_DATA_ARGS(val) \
+ (0x70000000 & ((val) << 28))
+#define TRACE_REC_TCS(val) \
+ (0x80000000 & ((val) << 31))
+
#define KVMIO 0xAE
/*