KVM: use __copy_to_user/__clear_user to write guest page
Xiao Guangrong [Sun, 15 May 2011 15:22:04 +0000 (23:22 +0800)]
Simply use __copy_to_user/__clear_user to write guest page since we have
already verified the user address when the memslot is set

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/kvm/x86.c
virt/kvm/kvm_main.c

index 51df0b6..0b08986 100644 (file)
@@ -1388,7 +1388,7 @@ static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
                        return 1;
                kvm_x86_ops->patch_hypercall(vcpu, instructions);
                ((unsigned char *)instructions)[3] = 0xc3; /* ret */
-               if (copy_to_user((void __user *)addr, instructions, 4))
+               if (__copy_to_user((void __user *)addr, instructions, 4))
                        return 1;
                kvm->arch.hv_hypercall = data;
                break;
@@ -1415,7 +1415,7 @@ static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
                                  HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
                if (kvm_is_error_hva(addr))
                        return 1;
-               if (clear_user((void __user *)addr, PAGE_SIZE))
+               if (__clear_user((void __user *)addr, PAGE_SIZE))
                        return 1;
                vcpu->arch.hv_vapic = data;
                break;
index 96ebc06..087b3f8 100644 (file)
@@ -1345,7 +1345,7 @@ int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
        addr = gfn_to_hva(kvm, gfn);
        if (kvm_is_error_hva(addr))
                return -EFAULT;
-       r = copy_to_user((void __user *)addr + offset, data, len);
+       r = __copy_to_user((void __user *)addr + offset, data, len);
        if (r)
                return -EFAULT;
        mark_page_dirty(kvm, gfn);
@@ -1405,7 +1405,7 @@ int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
        if (kvm_is_error_hva(ghc->hva))
                return -EFAULT;
 
-       r = copy_to_user((void __user *)ghc->hva, data, len);
+       r = __copy_to_user((void __user *)ghc->hva, data, len);
        if (r)
                return -EFAULT;
        mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);