KVM: Make kvm_set_spte_hva() return int

The patch is to make kvm_set_spte_hva() return int and caller can
check return value to determine flush tlb or not.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
Acked-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index c5634c6..4f3400a 100644 (file)
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -225,7 +225,7 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 #define KVM_ARCH_WANT_MMU_NOTIFIER
 int kvm_unmap_hva_range(struct kvm *kvm,
                        unsigned long start, unsigned long end);
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
+int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 
 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index c22e50b..063886b 100644 (file)
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -360,7 +360,7 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 #define KVM_ARCH_WANT_MMU_NOTIFIER
 int kvm_unmap_hva_range(struct kvm *kvm,
                        unsigned long start, unsigned long end);
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
+int 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);
 

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 2c1c53d..71c3f21 100644 (file)
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -933,7 +933,7 @@ enum kvm_mips_fault_result kvm_trap_emul_gva_fault(struct kvm_vcpu *vcpu,
 #define KVM_ARCH_WANT_MMU_NOTIFIER
 int kvm_unmap_hva_range(struct kvm *kvm,
                        unsigned long start, unsigned long end);
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
+int 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);
 

diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index d8dcdb3..97e538a 100644 (file)
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -551,7 +551,7 @@ static int kvm_set_spte_handler(struct kvm *kvm, gfn_t gfn, gfn_t gfn_end,
               (pte_dirty(old_pte) && !pte_dirty(hva_pte));
 }
 
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
 {
        unsigned long end = hva + PAGE_SIZE;
        int ret;
@@ -559,6 +559,7 @@ void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
        ret = handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &pte);
        if (ret)
                kvm_mips_callbacks->flush_shadow_all(kvm);
+       return 0;
 }
 
 static int kvm_age_hva_handler(struct kvm *kvm, gfn_t gfn, gfn_t gfn_end,

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 7a2483a..0f98f00 100644 (file)
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -72,7 +72,7 @@ extern int kvm_unmap_hva_range(struct kvm *kvm,
                               unsigned long start, unsigned long end);
 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);
+extern int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 
 #define HPTEG_CACHE_NUM                        (1 << 15)
 #define HPTEG_HASH_BITS_PTE            13

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index a35fb40..bd1a677 100644 (file)
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -851,9 +851,10 @@ int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
        return kvm->arch.kvm_ops->test_age_hva(kvm, hva);
 }
 
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
 {
        kvm->arch.kvm_ops->set_spte_hva(kvm, hva, pte);
+       return 0;
 }
 
 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)

diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index 8f2985e..c3f312b 100644 (file)
--- a/arch/powerpc/kvm/e500_mmu_host.c
+++ b/arch/powerpc/kvm/e500_mmu_host.c
@@ -757,10 +757,11 @@ int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
        return 0;
 }
 
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
 {
        /* The page will get remapped properly on its next fault */
        kvm_unmap_hva(kvm, hva);
+       return 0;
 }
 
 /*****************************************/

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 3639077..35638ac 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1512,7 +1512,7 @@ asmlinkage void kvm_spurious_fault(void);
 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
+int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v);
 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 711a41a..dd71864 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1913,9 +1913,10 @@ int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
        return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp);
 }
 
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
 {
        kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp);
+       return 0;
 }
 
 static int kvm_age_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,

diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index dee3dbd..3053bf2 100644 (file)
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -2049,14 +2049,14 @@ static int kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data
 }
 
 
-void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
 {
        unsigned long end = hva + PAGE_SIZE;
        kvm_pfn_t pfn = pte_pfn(pte);
        pte_t stage2_pte;
 
        if (!kvm->arch.pgd)
-               return;
+               return 0;
 
        trace_kvm_set_spte_hva(hva);
 
@@ -2067,6 +2067,8 @@ void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
        clean_dcache_guest_page(pfn, PAGE_SIZE);
        stage2_pte = kvm_pfn_pte(pfn, PAGE_S2);
        handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte);
+
+       return 0;
 }
 
 static int kvm_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)