[PATCH 1/7] KVM: arm64: Add two page mapping counters for kvm_stat

[Yoan Picchi]

Add a counter for when a regular page is mapped, and another
for when a huge page is mapped.

Signed-off-by: Yoan Picchi <yoan.picchi at arm.com>
---
 arch/arm64/include/asm/kvm_host.h | 2 ++
 arch/arm64/kvm/guest.c            | 2 ++
 arch/arm64/kvm/mmu.c              | 7 +++++++
 3 files changed, 11 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 3d10e6527..863603285 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -561,6 +561,8 @@ struct kvm_vcpu_stat {
 	u64 wfi_exit_stat;
 	u64 mmio_exit_user;
 	u64 mmio_exit_kernel;
+	u64 regular_page_mapped;
+	u64 huge_page_mapped;
 	u64 exits;
 };
 
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 9bbd30e62..14b15fb8f 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -38,6 +38,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
 	VCPU_STAT("mmio_exit_user", mmio_exit_user),
 	VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
+	VCPU_STAT("regular_page_mapped", regular_page_mapped),
+	VCPU_STAT("huge_page_mapped", huge_page_mapped),
 	VCPU_STAT("exits", exits),
 	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
 	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 77cb2d28f..3996b28da 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -914,6 +914,13 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 		mark_page_dirty(kvm, gfn);
 	}
 
+	if (ret >= 0) {
+		if (vma_pagesize == PAGE_SIZE) {
+			vcpu->stat.regular_page_mapped++;
+		} else {
+			vcpu->stat.huge_page_mapped++;
+		}
+	}
 out_unlock:
 	spin_unlock(&kvm->mmu_lock);
 	kvm_set_pfn_accessed(pfn);
-- 
2.17.1