KVM: MMU: large page support

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Create large pages mappings if the guest PTE's are marked as such and
the underlying memory is hugetlbfs backed.  If the largepage contains
write-protected pages, a large pte is not used.

Gives a consistent 2% improvement for data copies on ram mounted
filesystem, without NPT/EPT.

Anthony measures a 4% improvement on 4-way kernbench, with NPT.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

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Marcelo Tosatti 2008-02-23 11:44:30 -03:00 • committed by Avi Kivity

parent 2e53d63acb

commit 05da45583d

6 changed files with 262 additions and 32 deletions

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222

arch/x86/kvm/mmu.c

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32

arch/x86/kvm/paging_tmpl.h

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1

arch/x86/kvm/x86.c

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9

include/asm-x86/kvm_host.h

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5

include/linux/kvm_host.h

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25

virt/kvm/kvm_main.c

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