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 <yoan.picchi@xxxxxxx>
---
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
_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
