KVM: update to new mmu_notifier semantic v2

Calls to mmu_notifier_invalidate_page() were replaced by calls to
mmu_notifier_invalidate_range() and are now bracketed by calls to
mmu_notifier_invalidate_range_start()/end()

Remove now useless invalidate_page callback.

Changed since v1 (Linus Torvalds)
    - remove now useless kvm_arch_mmu_notifier_invalidate_page()

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Tested-by: Mike Galbraith <efault@gmx.de>
Tested-by: Adam Borowski <kilobyte@angband.pl>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: kvm@vger.kernel.org
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 127e2dd..4a879f6 100644 (file)
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -225,12 +225,6 @@ int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 
-/* We do not have shadow page tables, hence the empty hooks */
-static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
-                                                        unsigned long address)
-{
-}
-
 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 void kvm_arm_halt_guest(struct kvm *kvm);

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index d686300..e923b58 100644 (file)
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -326,12 +326,6 @@ void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 
-/* We do not have shadow page tables, hence the empty hooks */
-static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
-                                                        unsigned long address)
-{
-}
-
 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
 void kvm_arm_halt_guest(struct kvm *kvm);

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 2998479..a9af1d2 100644 (file)
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -938,11 +938,6 @@ void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 
-static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
-                                                        unsigned long address)
-{
-}
-
 /* Emulation */
 int kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);
 enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause);

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 8b3f123..e372ed8 100644 (file)
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -67,11 +67,6 @@ extern int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 extern int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 extern void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 
-static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
-                                                        unsigned long address)
-{
-}
-
 #define HPTEG_CACHE_NUM                        (1 << 15)
 #define HPTEG_HASH_BITS_PTE            13
 #define HPTEG_HASH_BITS_PTE_LONG       12

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f4d120a..92c9032 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1375,8 +1375,6 @@ int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
 int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event);
 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu);
-void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
-                                          unsigned long address);
 
 void kvm_define_shared_msr(unsigned index, u32 msr);
 int kvm_set_shared_msr(unsigned index, u64 val, u64 mask);

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 05a5e57..272320e 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6734,17 +6734,6 @@ void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page);
 
-void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
-                                          unsigned long address)
-{
-       /*
-        * The physical address of apic access page is stored in the VMCS.
-        * Update it when it becomes invalid.
-        */
-       if (address == gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT))
-               kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD);
-}
-
 /*
  * Returns 1 to let vcpu_run() continue the guest execution loop without
  * exiting to the userspace.  Otherwise, the value will be returned to the

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 15252d7..4d81f6d 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -322,47 +322,6 @@ static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
        return container_of(mn, struct kvm, mmu_notifier);
 }
 
-static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
-                                            struct mm_struct *mm,
-                                            unsigned long address)
-{
-       struct kvm *kvm = mmu_notifier_to_kvm(mn);
-       int need_tlb_flush, idx;
-
-       /*
-        * When ->invalidate_page runs, the linux pte has been zapped
-        * already but the page is still allocated until
-        * ->invalidate_page returns. So if we increase the sequence
-        * here the kvm page fault will notice if the spte can't be
-        * established because the page is going to be freed. If
-        * instead the kvm page fault establishes the spte before
-        * ->invalidate_page runs, kvm_unmap_hva will release it
-        * before returning.
-        *
-        * The sequence increase only need to be seen at spin_unlock
-        * time, and not at spin_lock time.
-        *
-        * Increasing the sequence after the spin_unlock would be
-        * unsafe because the kvm page fault could then establish the
-        * pte after kvm_unmap_hva returned, without noticing the page
-        * is going to be freed.
-        */
-       idx = srcu_read_lock(&kvm->srcu);
-       spin_lock(&kvm->mmu_lock);
-
-       kvm->mmu_notifier_seq++;
-       need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
-       /* we've to flush the tlb before the pages can be freed */
-       if (need_tlb_flush)
-               kvm_flush_remote_tlbs(kvm);
-
-       spin_unlock(&kvm->mmu_lock);
-
-       kvm_arch_mmu_notifier_invalidate_page(kvm, address);
-
-       srcu_read_unlock(&kvm->srcu, idx);
-}
-
 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
                                        struct mm_struct *mm,
                                        unsigned long address,
@@ -510,7 +469,6 @@ static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
 }
 
 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
-       .invalidate_page        = kvm_mmu_notifier_invalidate_page,
        .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
        .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
        .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,