[patch 1/3] KVM: split kvm_arch_flush_shadow

[Marcelo Tosatti]

Introducing kvm_arch_flush_shadow_memslot, to invalidate the
translations of a single memory slot.

Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>

Index: kvm/include/linux/kvm_host.h
===================================================================
--- kvm.orig/include/linux/kvm_host.h
+++ kvm/include/linux/kvm_host.h
@@ -458,7 +458,11 @@ void kvm_arch_commit_memory_region(struc
                                int user_alloc);
 bool kvm_largepages_enabled(void);
 void kvm_disable_largepages(void);
-void kvm_arch_flush_shadow(struct kvm *kvm);
+/* flush all memory translations */
+void kvm_arch_flush_shadow_all(struct kvm *kvm);
+/* flush memory translations pointing to 'slot' */
+void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+                                  struct kvm_memory_slot *slot);
 
 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
                            int nr_pages);
Index: kvm/virt/kvm/kvm_main.c
===================================================================
--- kvm.orig/virt/kvm/kvm_main.c
+++ kvm/virt/kvm/kvm_main.c
@@ -408,7 +408,7 @@ static void kvm_mmu_notifier_release(str
        int idx;
 
        idx = srcu_read_lock(&kvm->srcu);
-       kvm_arch_flush_shadow(kvm);
+       kvm_arch_flush_shadow_all(kvm);
        srcu_read_unlock(&kvm->srcu, idx);
 }
 
@@ -582,7 +582,7 @@ static void kvm_destroy_vm(struct kvm *k
 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
        mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
 #else
-       kvm_arch_flush_shadow(kvm);
+       kvm_arch_flush_shadow_all(kvm);
 #endif
        kvm_arch_destroy_vm(kvm);
        kvm_free_physmem(kvm);
@@ -814,7 +814,7 @@ int __kvm_set_memory_region(struct kvm *
                 *      - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
                 *      - kvm_is_visible_gfn (mmu_check_roots)
                 */
-               kvm_arch_flush_shadow(kvm);
+               kvm_arch_flush_shadow_memslot(kvm, slot);
                kfree(old_memslots);
        }
 
@@ -854,7 +854,7 @@ int __kvm_set_memory_region(struct kvm *
         * mmio sptes.
         */
        if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
-               kvm_arch_flush_shadow(kvm);
+               kvm_arch_flush_shadow_all(kvm);
 
        kvm_free_physmem_slot(&old, &new);
        kfree(old_memslots);
Index: kvm/arch/ia64/kvm/kvm-ia64.c
===================================================================
--- kvm.orig/arch/ia64/kvm/kvm-ia64.c
+++ kvm/arch/ia64/kvm/kvm-ia64.c
@@ -1613,11 +1613,17 @@ void kvm_arch_commit_memory_region(struc
        return;
 }
 
-void kvm_arch_flush_shadow(struct kvm *kvm)
+void kvm_arch_flush_shadow_all(struct kvm *kvm)
 {
        kvm_flush_remote_tlbs(kvm);
 }
 
+void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+                                  struct kvm_memory_slot *slot)
+{
+       kvm_arch_flush_shadow_all();
+}
+
 long kvm_arch_dev_ioctl(struct file *filp,
                        unsigned int ioctl, unsigned long arg)
 {
Index: kvm/arch/powerpc/kvm/powerpc.c
===================================================================
--- kvm.orig/arch/powerpc/kvm/powerpc.c
+++ kvm/arch/powerpc/kvm/powerpc.c
@@ -334,8 +334,12 @@ void kvm_arch_commit_memory_region(struc
        kvmppc_core_commit_memory_region(kvm, mem);
 }
 
+void kvm_arch_flush_shadow_all(struct kvm *kvm)
+{
+}
 
-void kvm_arch_flush_shadow(struct kvm *kvm)
+void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+                                  struct kvm_memory_slot *slot)
 {
 }
 
Index: kvm/arch/s390/kvm/kvm-s390.c
===================================================================
--- kvm.orig/arch/s390/kvm/kvm-s390.c
+++ kvm/arch/s390/kvm/kvm-s390.c
@@ -969,7 +969,12 @@ void kvm_arch_commit_memory_region(struc
        return;
 }
 
-void kvm_arch_flush_shadow(struct kvm *kvm)
+void kvm_arch_flush_shadow_all(struct kvm *kvm)
+{
+}
+
+void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+                                  struct kvm_memory_slot *slot)
 {
 }
 
Index: kvm/arch/x86/kvm/x86.c
===================================================================
--- kvm.orig/arch/x86/kvm/x86.c
+++ kvm/arch/x86/kvm/x86.c
@@ -6457,12 +6457,18 @@ void kvm_arch_commit_memory_region(struc
        spin_unlock(&kvm->mmu_lock);
 }
 
-void kvm_arch_flush_shadow(struct kvm *kvm)
+void kvm_arch_flush_shadow_all(struct kvm *kvm)
 {
        kvm_mmu_zap_all(kvm);
        kvm_reload_remote_mmus(kvm);
 }
 
+void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+                                  struct kvm_memory_slot *slot)
+{
+       kvm_arch_flush_shadow_all(kvm);
+}
+
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
 {
        return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&


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