KVM: Remove tlbs_dirty

There is no user of tlbs_dirty.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210918005636.3675-4-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 000ea73..0f18df7 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -608,7 +608,6 @@ struct kvm {
        unsigned long mmu_notifier_range_start;
        unsigned long mmu_notifier_range_end;
 #endif
-       long tlbs_dirty;
        struct list_head devices;
        u64 manual_dirty_log_protect;
        struct dentry *debugfs_dentry;

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e95e7a9..7851f3a 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -326,13 +326,8 @@ EXPORT_SYMBOL_GPL(kvm_make_all_cpus_request);
 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
 void kvm_flush_remote_tlbs(struct kvm *kvm)
 {
-       /*
-        * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
-        * kvm_make_all_cpus_request.
-        */
-       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.
@@ -347,7 +342,6 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
        if (!kvm_arch_flush_remote_tlb(kvm)
            || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
                ++kvm->stat.generic.remote_tlb_flush;
-       cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
 }
 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
 #endif
@@ -552,7 +546,7 @@ static __always_inline int __kvm_handle_hva_range(struct kvm *kvm,
                }
        }
 
-       if (range->flush_on_ret && (ret || kvm->tlbs_dirty))
+       if (range->flush_on_ret && ret)
                kvm_flush_remote_tlbs(kvm);
 
        if (locked)