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| author | Mario Smarduch | 2015-01-16 00:58:57 +0100 |
|---|---|---|
| committer | Christoffer Dall | 2015-01-16 14:40:15 +0100 |
| commit | 53c810c364d7a2d5cebd5a0e4c882643af3b0a0e (patch) | |
| tree | 4f8221dc438d699b4de8ca7ac77507bc21df9dec /arch/arm/kvm/mmu.c | |
| parent | KVM: arm: Add initial dirty page locking support (diff) | |
| download | kernel-qcow2-linux-53c810c364d7a2d5cebd5a0e4c882643af3b0a0e.tar.gz kernel-qcow2-linux-53c810c364d7a2d5cebd5a0e4c882643af3b0a0e.tar.xz kernel-qcow2-linux-53c810c364d7a2d5cebd5a0e4c882643af3b0a0e.zip | |
KVM: arm: dirty logging write protect support
Add support to track dirty pages between user space KVM_GET_DIRTY_LOG ioctl
calls. We call kvm_get_dirty_log_protect() function to do most of the work.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>
Diffstat (limited to 'arch/arm/kvm/mmu.c')
| -rw-r--r-- | arch/arm/kvm/mmu.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c index c9e5f384832e..565e903f6f78 100644 --- a/arch/arm/kvm/mmu.c +++ b/arch/arm/kvm/mmu.c @@ -1029,6 +1029,28 @@ void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot) spin_unlock(&kvm->mmu_lock); kvm_flush_remote_tlbs(kvm); } + +/** + * kvm_arch_mmu_write_protect_pt_masked() - write protect dirty pages + * @kvm: The KVM pointer + * @slot: The memory slot associated with mask + * @gfn_offset: The gfn offset in memory slot + * @mask: The mask of dirty pages at offset 'gfn_offset' in this memory + * slot to be write protected + * + * Walks bits set in mask write protects the associated pte's. Caller must + * acquire kvm_mmu_lock. + */ +void kvm_arch_mmu_write_protect_pt_masked(struct kvm *kvm, + struct kvm_memory_slot *slot, + gfn_t gfn_offset, unsigned long mask) +{ + phys_addr_t base_gfn = slot->base_gfn + gfn_offset; + phys_addr_t start = (base_gfn + __ffs(mask)) << PAGE_SHIFT; + phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT; + + stage2_wp_range(kvm, start, end); +} #endif static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, |