KVM: MMU: let page fault handler be aware tracked page
authorXiao Guangrong <guangrong.xiao@linux.intel.com>
Wed, 24 Feb 2016 09:51:11 +0000 (17:51 +0800)
committerPaolo Bonzini <pbonzini@redhat.com>
Thu, 3 Mar 2016 13:36:21 +0000 (14:36 +0100)
commit3d0c27ad6ee465f174b09ee99fcaf189c57d567a
treee342d0a67b9b7fbc4e124aaa85f873b017a9edb8
parentf29d4d7810d7fd61442371cd68957e1d37ed79bb
KVM: MMU: let page fault handler be aware tracked page

The page fault caused by write access on the write tracked page can not
be fixed, it always need to be emulated. page_fault_handle_page_track()
is the fast path we introduce here to skip holding mmu-lock and shadow
page table walking

However, if the page table is not present, it is worth making the page
table entry present and readonly to make the read access happy

mmu_need_write_protect() need to be cooked to avoid page becoming writable
when making page table present or sync/prefetch shadow page table entries

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/include/asm/kvm_page_track.h
arch/x86/kvm/mmu.c
arch/x86/kvm/page_track.c
arch/x86/kvm/paging_tmpl.h