KVM: remove dummy pages

Xiao Guangrong kvm lkml 2 versions Jul 23, 2012 – Jul 26, 2012 In review

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correct some typos in the title/changelog.

#	Subject and files	Size	Replies
1/3	KVM: MMU: use kvm_release_pfn_clean to release pfn`arch/x86/kvm/mmu.c`	+1 -1	0 replies
2/3	KVM: use kvm_release_page_clean to release the page`virt/kvm/async_pf.c`	+2 -2	0 replies
3/3	KVM: remove dummy pages`include/linux/kvm_host.h` `virt/kvm/async_pf.c` `virt/kvm/kvm_main.c`	+52 ~~-75~~	5 replies

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Cover letter [PATCH v2 0/3] KVM: remove dummy pages

Changelog:
correct some typos in the title/changelog.

Currently, kvm allocates some pages (e.g: bad_page/fault_page) and use them as error indicators, it wastes memory and is not good for scalability.

Base on Avi's suggestion, in this patchset, we introduce some error codes instead of these pages to indicate the error conditions.