[PATCH 5/7] KVM: arm64: Add memory_slot_unmaped counter for kvm_stat
From: Yoan Picchi <hidden>
Date: 2021-03-19 16:20:18
Also in:
kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Add a counter for when a memory slot is unmapped, meaning that all memory belonging to a specific VM is made available to be mapped for anoother VM. A memory slot is the memory that can be used to hold a guest's pages and can be made available by Qemu for instance. For now the memory slot are only unmapped when a vm restarts. Signed-off-by: Yoan Picchi <redacted> --- arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/guest.c | 1 + arch/arm64/kvm/mmu.c | 1 + 3 files changed, 3 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index e6967951f..76c81aa79 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h@@ -548,6 +548,7 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg) struct kvm_vm_stat { ulong remote_tlb_flush; ulong flush_all_cache_lines; + ulong memory_slot_unmaped; ulong cached_page_invalidated; };
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index d948c3bd2..cd227136e 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c@@ -42,6 +42,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT("huge_page_mapped", huge_page_mapped), 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("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 985b048df..1e8aeafc2 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c@@ -419,6 +419,7 @@ static void stage2_unmap_memslot(struct kvm *kvm, phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT; phys_addr_t size = PAGE_SIZE * memslot->npages; hva_t reg_end = hva + size; + kvm->stat.memory_slot_unmaped++; /* * A memory region could potentially cover multiple VMAs, and any holes
--
2.17.1
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