[PATCH 4/7] KVM: arm64: Add flush_all_cache_lines counter for kvm_stat
From: Yoan Picchi <hidden>
Date: 2021-03-19 16:19:43
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 that triggers when all the cache are flushed. This happens when toggling caching for instance. 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 3609aa89d..e6967951f 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 flush_all_cache_lines; ulong cached_page_invalidated; };
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index f6b1f0b63..d948c3bd2 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("flush_all_cache_lines", flush_all_cache_lines), 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 d6ddf5ab8..985b048df 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c@@ -181,6 +181,7 @@ static void stage2_flush_vm(struct kvm *kvm) kvm_for_each_memslot(memslot, slots) stage2_flush_memslot(kvm, memslot); + kvm->stat.flush_all_cache_lines++; spin_unlock(&kvm->mmu_lock); srcu_read_unlock(&kvm->srcu, idx); }
--
2.17.1
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