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authorJing Zhang <jingzhangos@google.com>2021-08-17 00:26:39 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2021-09-06 06:30:45 -0400
commit3cc4e148b96263313e3dce926eae569c942bb74e (patch)
tree5fad27d657f971485b97da0ee0c3970e996b539e
parentfdde13c13f9012b22e1b3a1df8a108d147842f6f (diff)
KVM: stats: Add VM stat for remote tlb flush requests
Add a new stat that counts the number of times a remote TLB flush is requested, regardless of whether it kicks vCPUs out of guest mode. This allows us to look at how often flushes are initiated. Unlike remote_tlb_flush, this one applies to ARM's instruction-set-based TLB flush implementation, so apply it there too. Original-by: David Matlack <dmatlack@google.com> Signed-off-by: Jing Zhang <jingzhangos@google.com> Message-Id: <20210817002639.3856694-1-jingzhangos@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--arch/arm64/kvm/mmu.c1
-rw-r--r--include/linux/kvm_host.h3
-rw-r--r--include/linux/kvm_types.h1
-rw-r--r--virt/kvm/kvm_main.c1
4 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 0625bf2353c2..f5bb235bbb59 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -80,6 +80,7 @@ static bool memslot_is_logging(struct kvm_memory_slot *memslot)
*/
void kvm_flush_remote_tlbs(struct kvm *kvm)
{
+ ++kvm->stat.generic.remote_tlb_flush_requests;
kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu);
}
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index e4d712e9f760..c177789a8542 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1444,7 +1444,8 @@ struct _kvm_stats_desc {
KVM_STATS_BASE_POW10, -9, sz)
#define KVM_GENERIC_VM_STATS() \
- STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush)
+ STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush), \
+ STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush_requests)
#define KVM_GENERIC_VCPU_STATS() \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_successful_poll), \
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index de7fb5f364d8..2237abb93ccd 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -80,6 +80,7 @@ struct kvm_mmu_memory_cache {
struct kvm_vm_stat_generic {
u64 remote_tlb_flush;
+ u64 remote_tlb_flush_requests;
};
struct kvm_vcpu_stat_generic {
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 140c7d311021..305956310174 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -318,6 +318,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
*/
long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
+ ++kvm->stat.generic.remote_tlb_flush_requests;
/*
* We want to publish modifications to the page tables before reading
* mode. Pairs with a memory barrier in arch-specific code.