From: Ștefan Șicleru <ssicleru@xxxxxxxxxxxxxxx>
This function is needed for the KVMI_VM_GET_MAX_GFN command.
Signed-off-by: Ștefan Șicleru <ssicleru@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
include/linux/kvm_host.h | 1 +
virt/kvm/kvm_main.c | 25 +++++++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 1bbb07b87d1a..cd6ac3a43c9a 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -807,6 +807,7 @@ bool kvm_vcpu_is_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);
unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn);
void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
+gfn_t kvm_get_max_gfn(struct kvm *kvm);
struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 069668b8afc2..e19dd6f92709 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1410,6 +1410,31 @@ static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
return kvm_set_memory_region(kvm, mem);
}
+gfn_t kvm_get_max_gfn(struct kvm *kvm)
+{
+ u32 skip_mask = KVM_MEM_READONLY | KVM_MEMSLOT_INVALID;
+ struct kvm_memory_slot *memslot;
+ struct kvm_memslots *slots;
+ gfn_t max_gfn = 0;
+ int idx;
+
+ idx = srcu_read_lock(&kvm->srcu);
+ spin_lock(&kvm->mmu_lock);
+
+ slots = kvm_memslots(kvm);
+ kvm_for_each_memslot(memslot, slots)
+ if (memslot->id < KVM_USER_MEM_SLOTS &&
+ (memslot->flags & skip_mask) == 0 &&
+ memslot->npages)
+ max_gfn = max(max_gfn, memslot->base_gfn
+ + memslot->npages);
+
+ spin_unlock(&kvm->mmu_lock);
+ srcu_read_unlock(&kvm->srcu, idx);
+
+ return max_gfn;
+}
+
#ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
/**
* kvm_get_dirty_log - get a snapshot of dirty pages
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