[PATCH 3/7] KVM: arm64: Add cached_page_invalidated counter for kvm_stat
From: Yoan Picchi <hidden>
Date: 2021-03-19 16:19:40
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 some counter for when a dpage get invalidated. The counter isn't in the function that actually do it though because it doesn't have either a kvm or vcpu argument, so we would have no way to access the counters. For this reason, the counter have been added to the calling functions instead. 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 | 5 ++++- 3 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 863603285..3609aa89d 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h@@ -547,6 +547,7 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg) struct kvm_vm_stat { ulong remote_tlb_flush; + ulong cached_page_invalidated; }; struct kvm_vcpu_stat {
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 1029976ca..f6b1f0b63 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c@@ -41,6 +41,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { VCPU_STAT("regular_page_mapped", regular_page_mapped), VCPU_STAT("huge_page_mapped", huge_page_mapped), VM_STAT("remote_tlb_flush", remote_tlb_flush), + VM_STAT("cached_page_invalidated", cached_page_invalidated), 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 55d7fe63b..d6ddf5ab8 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c@@ -893,8 +893,10 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, if (writable) prot |= KVM_PGTABLE_PROT_W; - if (fault_status != FSC_PERM && !device) + if (fault_status != FSC_PERM && !device) { clean_dcache_guest_page(pfn, vma_pagesize); + kvm->stat.cached_page_invalidated++; + } if (exec_fault) { prot |= KVM_PGTABLE_PROT_X;
@@ -1166,6 +1168,7 @@ int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) * just like a translation fault and clean the cache to the PoC. */ clean_dcache_guest_page(pfn, PAGE_SIZE); + kvm->stat.cached_page_invalidated++; handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &pfn); return 0; }
--
2.17.1
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