[patch 1/3] KVM: split kvm_arch_flush_shadow

Marcelo Tosatti
2012-08-24T18:58:12Z

[-- Attachment #1: 01-flush-per-memslot --]
[-- Type: text/plain, Size: 4329 bytes --]

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

Signed-off-by: Marcelo Tosatti <mtosatti@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 &&