[PATCH 6/7] KVM: arm64: Add stage2_unmap_vm counter for kvm_stat

[Yoan Picchi]

Add a counter for when the one want to unmap all the ram of a VM.
This mostly happens when one restart a VM so we make sure to clear
the ram and free the memory for other VMs.

Signed-off-by: Yoan Picchi <yoan.picchi at arm.com>
---
 arch/arm64/include/asm/kvm_host.h | 1 +
 arch/arm64/kvm/guest.c            | 1 +
 arch/arm64/kvm/mmu.c              | 2 ++
 3 files changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 76c81aa79..fa59b669c 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -549,6 +549,7 @@ struct kvm_vm_stat {
 	ulong remote_tlb_flush;
 	ulong flush_all_cache_lines;
 	ulong memory_slot_unmaped;
+	ulong stage2_unmap_vm;
 	ulong cached_page_invalidated;
 };
 
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index cd227136e..129c0d53d 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -43,6 +43,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VM_STAT("remote_tlb_flush", remote_tlb_flush),
 	VM_STAT("flush_all_cache_lines", flush_all_cache_lines),
 	VM_STAT("memory_slot_unmaped", memory_slot_unmaped),
+	VM_STAT("stage2_unmap_vm", stage2_unmap_vm),
 	VM_STAT("cached_page_invalidated", cached_page_invalidated),
 	VCPU_STAT("exits", exits),
 	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 1e8aeafc2..6d150a785 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -471,6 +471,8 @@ void stage2_unmap_vm(struct kvm *kvm)
 	mmap_read_lock(current->mm);
 	spin_lock(&kvm->mmu_lock);
 
+	kvm->stat.stage2_unmap_vm++;
+
 	slots = kvm_memslots(kvm);
 	kvm_for_each_memslot(memslot, slots)
 		stage2_unmap_memslot(kvm, memslot);
-- 
2.17.1