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| author |   Peter Xu <peterx@redhat.com> | 2021-07-30 18:04:51 -0400 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2021-08-20 16:04:51 -0400 |
| commit | 4139b1972af281e0293c2414a0f1cd59fa5b2980 (patch) | |
| tree | 202e3f61cc9d7c556c794ae2efbf7c1d518787ff /arch/x86/kvm/mmu.h | |
| parent | KVM: Allow to have arch-specific per-vm debugfs files (diff) | |
| download | linux-dev-4139b1972af281e0293c2414a0f1cd59fa5b2980.tar.xz linux-dev-4139b1972af281e0293c2414a0f1cd59fa5b2980.zip | |
KVM: X86: Introduce kvm_mmu_slot_lpages() helpers
Introduce kvm_mmu_slot_lpages() to calculcate lpage_info and rmap array size.
The other __kvm_mmu_slot_lpages() can take an extra parameter of npages rather
than fetching from the memslot pointer. Start to use the latter one in
kvm_alloc_memslot_metadata().
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210730220455.26054-4-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.h')
| -rw-r--r-- | arch/x86/kvm/mmu.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 83e6c6965f1e..59e831a8ab9d 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -240,4 +240,25 @@ static inline bool kvm_memslots_have_rmaps(struct kvm *kvm) return smp_load_acquire(&kvm->arch.memslots_have_rmaps); } +static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level) +{ + /* KVM_HPAGE_GFN_SHIFT(PG_LEVEL_4K) must be 0. */ + return (gfn >> KVM_HPAGE_GFN_SHIFT(level)) - + (base_gfn >> KVM_HPAGE_GFN_SHIFT(level)); +} + +static inline unsigned long +__kvm_mmu_slot_lpages(struct kvm_memory_slot *slot, unsigned long npages, + int level) +{ + return gfn_to_index(slot->base_gfn + npages - 1, + slot->base_gfn, level) + 1; +} + +static inline unsigned long +kvm_mmu_slot_lpages(struct kvm_memory_slot *slot, int level) +{ + return __kvm_mmu_slot_lpages(slot, slot->npages, level); +} + #endif |