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>

1 files changed, 9 insertions, 8 deletions

diff --git a/virt/kvm/kvm_trace.c b/virt/kvm/kvm_trace.c
index 58141f31ea8f..9acb78b3cc9f 100644
--- a/virt/kvm/kvm_trace.c
+++ b/virt/kvm/kvm_trace.c
@@ -54,12 +54,13 @@ static void kvm_add_trace(void *probe_private, void *call_data,
         struct kvm_trace *kt = kvm_trace;
         struct kvm_trace_rec rec;
         struct kvm_vcpu *vcpu;
-        int    i, extra, size;
+        int    i, size;
+        u32    extra;
 
         if (unlikely(kt->trace_state != KVM_TRACE_STATE_RUNNING))
                 return;
 
-        rec.event       = va_arg(*args, u32);
+        rec.rec_val     = TRACE_REC_EVENT_ID(va_arg(*args, u32));
         vcpu            = va_arg(*args, struct kvm_vcpu *);
         rec.pid         = current->tgid;
         rec.vcpu_id     = vcpu->vcpu_id;
@@ -67,21 +68,21 @@ static void kvm_add_trace(void *probe_private, void *call_data,
         extra           = va_arg(*args, u32);
         WARN_ON(!(extra <= KVM_TRC_EXTRA_MAX));
         extra           = min_t(u32, extra, KVM_TRC_EXTRA_MAX);
-        rec.extra_u32   = extra;
 
-        rec.cycle_in    = p->cycle_in;
+        rec.rec_val |= TRACE_REC_TCS(p->cycle_in)
+                        | TRACE_REC_NUM_DATA_ARGS(extra);
 
-        if (rec.cycle_in) {
+        if (p->cycle_in) {
                 rec.u.cycle.cycle_u64 = get_cycles();
 
-                for (i = 0; i < rec.extra_u32; i++)
+                for (i = 0; i < extra; i++)
                         rec.u.cycle.extra_u32[i] = va_arg(*args, u32);
         } else {
-                for (i = 0; i < rec.extra_u32; i++)
+                for (i = 0; i < extra; i++)
                         rec.u.nocycle.extra_u32[i] = va_arg(*args, u32);
         }
 
-        size = calc_rec_size(rec.cycle_in, rec.extra_u32 * sizeof(u32));
+        size = calc_rec_size(p->cycle_in, extra * sizeof(u32));
         relay_write(kt->rchan, &rec, size);
 }