KVM: Provide unlocked version of emulator_write_phys()

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 14 insertions, 7 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1b9e695cc641..03ba402c476a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1840,22 +1840,29 @@ mmio:
         return X86EMUL_UNHANDLEABLE;
 }
 
-static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
-                               const void *val, int bytes)
+int __emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
+                          const void *val, int bytes)
 {
         int ret;
 
-        down_read(&vcpu->kvm->slots_lock);
         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
-        if (ret < 0) {
-                up_read(&vcpu->kvm->slots_lock);
+        if (ret < 0)
                 return 0;
-        }
         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
-        up_read(&vcpu->kvm->slots_lock);
         return 1;
 }
 
+static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
+                        const void *val, int bytes)
+{
+        int ret;
+
+        down_read(&vcpu->kvm->slots_lock);
+        ret =__emulator_write_phys(vcpu, gpa, val, bytes);
+        up_read(&vcpu->kvm->slots_lock);
+        return ret;
+}
+
 static int emulator_write_emulated_onepage(unsigned long addr,
                                            const void *val,
                                            unsigned int bytes,