KVM: MMU: reduce the size of shadow page structure and some cleanup

Status from this message: Applied, thanks.

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#	Subject and files	Size	Replies
1/8	KVM: MMU: combine unsync and unsync_children`Documentation/virtual/kvm/mmu.txt` `arch/x86/include/asm/kvm_host.h` `arch/x86/kvm/mmu.c` +3 more	+48 ~~-21~~	5 replies
2/8	KVM: MMU: set the dirty bit for the upper shadow page`arch/x86/kvm/mmu.c`	+5 -8	2 replies
3/8	KVM: MMU: do not add a nonpresent spte to rmaps of its child`arch/x86/kvm/mmu.c` `arch/x86/kvm/mmutrace.h` `arch/x86/kvm/paging_tmpl.h`	+32 ~~-58~~	2 replies
4/8	KVM: MMU: drop unsync_child_bitmap`Documentation/virtual/kvm/mmu.txt` `arch/x86/include/asm/kvm_host.h` `arch/x86/kvm/mmu.c`	+52 ~~-30~~	2 replies
5/8	KVM: MMU: optimize walking unsync shadow page`arch/x86/kvm/mmu.c`	+4 -1	0 replies
6/8	KVM: MMU: optimize handing invlpg`arch/x86/kvm/paging_tmpl.h`	+1 -1	0 replies
7/8	KVM: MMU: remove the redundant get_written_sptes`arch/x86/kvm/mmu.c`	+2 -4	1 reply
8/8	KVM: MMU: remove PT64_SECOND_AVAIL_BITS_SHIFT`arch/x86/kvm/mmu.c`	+0 -1	2 replies

No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.

Cover letter [PATCH 0/8] KVM: MMU: reduce the size of shadow page structure and some cleanup

In this patchset, we observably reduce the size of struct kvm_mmu_page and let the code more simple.

And this patchset have already tested by unittest and RHEL.6.1 setup/boot/reboot/shutdown.