linux-kernel - [PATCH] KVM: ARM: count remote TLB flushes

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Message-Id: <20210727103251.16561-1-pbonzini@redhat.com>
Date:   Tue, 27 Jul 2021 12:32:51 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     maz@...nel.org, kvmarm@...ts.cs.columbia.edu
Subject: [PATCH] KVM: ARM: count remote TLB flushes

KVM/ARM has an architecture-specific implementation of
kvm_flush_remote_tlbs; however, unlike the generic one,
it does not count the flushes in kvm->stat.remote_tlb_flush,
so that it inexorably remained stuck to zero.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/arm64/kvm/mmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index c10207fed2f3..6cf16b43bfcc 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -81,6 +81,7 @@ static bool memslot_is_logging(struct kvm_memory_slot *memslot)
 void kvm_flush_remote_tlbs(struct kvm *kvm)
 {
 	kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu);
+	++kvm->stat.generic.remote_tlb_flush;
 }
 
 static bool kvm_is_device_pfn(unsigned long pfn)
-- 
2.31.1