Merge branch 'kvm-updates-2.6.27' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm

* 'kvm-updates-2.6.27' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm: (70 commits)
  KVM: Adjust smp_call_function_mask() callers to new requirements
  KVM: MMU: Fix potential race setting upper shadow ptes on nonpae hosts
  KVM: x86 emulator: emulate clflush
  KVM: MMU: improve invalid shadow root page handling
  KVM: MMU: nuke shadowed pgtable pages and ptes on memslot destruction
  KVM: Prefix some x86 low level function with kvm_, to avoid namespace issues
  KVM: check injected pic irq within valid pic irqs
  KVM: x86 emulator: Fix HLT instruction
  KVM: Apply the kernel sigmask to vcpus blocked due to being uninitialized
  KVM: VMX: Add ept_sync_context in flush_tlb
  KVM: mmu_shrink: kvm_mmu_zap_page requires slots_lock to be held
  x86: KVM guest: make kvm_smp_prepare_boot_cpu() static
  KVM: SVM: fix suspend/resume support
  KVM: s390: rename private structures
  KVM: s390: Set guest storage limit and offset to sane values
  KVM: Fix memory leak on guest exit
  KVM: s390: dont allocate dirty bitmap
  KVM: move slots_lock acquision down to vapic_exit
  KVM: VMX: Fake emulate Intel perfctr MSRs
  KVM: VMX: Fix a wrong usage of vmcs_config
  ...

1 files changed, 12 insertions, 6 deletions

diff --git a/virt/kvm/kvm_trace.c b/virt/kvm/kvm_trace.c
index 0e495470788d..58141f31ea8f 100644
--- a/virt/kvm/kvm_trace.c
+++ b/virt/kvm/kvm_trace.c
@@ -72,11 +72,7 @@ static void kvm_add_trace(void *probe_private, void *call_data,
         rec.cycle_in    = p->cycle_in;
 
         if (rec.cycle_in) {
-                u64 cycle = 0;
-
-                cycle = get_cycles();
-                rec.u.cycle.cycle_lo = (u32)cycle;
-                rec.u.cycle.cycle_hi = (u32)(cycle >> 32);
+                rec.u.cycle.cycle_u64 = get_cycles();
 
                 for (i = 0; i < rec.extra_u32; i++)
                         rec.u.cycle.extra_u32[i] = va_arg(*args, u32);
@@ -114,8 +110,18 @@ static int kvm_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
 {
         struct kvm_trace *kt;
 
-        if (!relay_buf_full(buf))
+        if (!relay_buf_full(buf)) {
+                if (!prev_subbuf) {
+                        /*
+                         * executed only once when the channel is opened
+                         * save metadata as first record
+                         */
+                        subbuf_start_reserve(buf, sizeof(u32));
+                        *(u32 *)subbuf = 0x12345678;
+                }
+
                 return 1;
+        }
 
         kt = buf->chan->private_data;
         atomic_inc(&kt->lost_records);