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| author |   Paolo Bonzini <pbonzini@redhat.com> | 2016-02-23 12:51:19 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-08 12:33:38 +0100 |
| commit | 6bb69c9b69c315200ddc2bc79aee14c0184cf5b2 (patch) | |
| tree | c7023298fd90cabf3532b45afa31c03e71fdd604 /arch/x86/include/asm/kvm_host.h | |
| parent | KVM: MMU: coalesce more page zapping in mmu_sync_children (diff) | |
| download | linux-dev-6bb69c9b69c315200ddc2bc79aee14c0184cf5b2.tar.xz linux-dev-6bb69c9b69c315200ddc2bc79aee14c0184cf5b2.zip | |
KVM: MMU: simplify last_pte_bitmap
Branch-free code is fun and everybody knows how much Avi loves it,
but last_pte_bitmap takes it a bit to the extreme. Since the code
is simply doing a range check, like
(level == 1 ||
((gpte & PT_PAGE_SIZE_MASK) && level < N)
we can make it branch-free without storing the entire truth table;
it is enough to cache N.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_host.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 1c3e390993a2..d110dc44d6c2 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -347,12 +347,8 @@ struct kvm_mmu { struct rsvd_bits_validate guest_rsvd_check; - /* - * Bitmap: bit set = last pte in walk - * index[0:1]: level (zero-based) - * index[2]: pte.ps - */ - u8 last_pte_bitmap; + /* Can have large pages at levels 2..last_nonleaf_level-1. */ + u8 last_nonleaf_level; bool nx; |