Revert "KVM: MMU: show mmu_valid_gen in shadow page related tracepoints"

...as part of removing x86 KVM's fast invalidate mechanism, i.e. this
is one part of a revert all patches from the series that introduced the
mechanism[1].

This reverts commit 2248b023.

[1] https://lkml.kernel.org/r/1369960590-14138-1-git-send-email-xiaoguangrong@linux.vnet.ibm.com

Cc: Xiao Guangrong <guangrong.xiao@gmail.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmutrace.h

@@ -9,14 +9,12 @@
 #define TRACE_SYSTEM kvmmmu
 
 #define KVM_MMU_PAGE_FIELDS \
-	__field(unsigned long, mmu_valid_gen)	\
 	__field(__u64, gfn) \
 	__field(__u32, role) \
 	__field(__u32, root_count) \
 	__field(bool, unsync)
 
 #define KVM_MMU_PAGE_ASSIGN(sp)			     \
-	__entry->mmu_valid_gen = sp->mmu_valid_gen;	\
 	__entry->gfn = sp->gfn;			     \
 	__entry->role = sp->role.word;		     \
 	__entry->root_count = sp->root_count;        \
@@ -31,9 +29,8 @@
 								        \
 	role.word = __entry->role;					\
 									\
-	trace_seq_printf(p, "sp gen %lx gfn %llx l%u%s q%u%s %s%s"	\
+	trace_seq_printf(p, "sp gfn %llx l%u%s q%u%s %s%s"		\
 			 " %snxe %sad root %u %s%c",			\
-			 __entry->mmu_valid_gen,			\
 			 __entry->gfn, role.level,			\
 			 role.cr4_pae ? " pae" : "",			\
 			 role.quadrant,					\