KVM: MMU: store generation-number into mmio spte

Store the generation-number into bit3 ~ bit11 and bit52 ~ bit61, totally
19 bits can be used, it should be enough for nearly all most common cases

In this patch, the generation-number is always 0, it will be changed in
the later patch

[Gleb: masking generation bits from spte in get_mmio_spte_gfn() and
       get_mmio_spte_access()]

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
index eb444dd374af..ad24757041ad 100644
--- a/arch/x86/kvm/mmutrace.h
+++ b/arch/x86/kvm/mmutrace.h
@@ -199,23 +199,25 @@ DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_prepare_zap_page,
 
 TRACE_EVENT(
         mark_mmio_spte,
-        TP_PROTO(u64 *sptep, gfn_t gfn, unsigned access),
-        TP_ARGS(sptep, gfn, access),
+        TP_PROTO(u64 *sptep, gfn_t gfn, unsigned access, unsigned int gen),
+        TP_ARGS(sptep, gfn, access, gen),
 
         TP_STRUCT__entry(
                 __field(void *, sptep)
                 __field(gfn_t, gfn)
                 __field(unsigned, access)
+                __field(unsigned int, gen)
         ),
 
         TP_fast_assign(
                 __entry->sptep = sptep;
                 __entry->gfn = gfn;
                 __entry->access = access;
+                __entry->gen = gen;
         ),
 
-        TP_printk("sptep:%p gfn %llx access %x", __entry->sptep, __entry->gfn,
-                  __entry->access)
+        TP_printk("sptep:%p gfn %llx access %x gen %x", __entry->sptep,
+                  __entry->gfn, __entry->access, __entry->gen)
 );
 
 TRACE_EVENT(