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Commit ff990d59 authored by Uri Lublin's avatar Uri Lublin Committed by Avi Kivity
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KVM: Remove write access permissions when dirty-page-logging is enabled 



Enabling dirty page logging is done using KVM_SET_MEMORY_REGION ioctl.
If the memory region already exists, we need to remove write accesses,
so writes will be caught, and dirty pages will be logged.

Signed-off-by: default avatarUri Lublin <uril@qumranet.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 02b27c1f

drivers/kvm/kvm_main.c

+2 −0
Original line number Diff line number Diff line
@@ -748,6 +748,8 @@ static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, 
		vcpu = vcpu_load_slot(kvm, i);

		if (!vcpu)

			continue;

		if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)

			do_remove_write_access(vcpu, mem->slot);

		kvm_mmu_reset_context(vcpu);

		vcpu_put(vcpu);

	}