KVM: VMX: free vpid when fail to create vcpu

Fix bug of the exception path, free allocated vpid when fail
to create vcpu.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index d0a10b5..54c0035 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2333,6 +2333,16 @@ static void allocate_vpid(struct vcpu_vmx *vmx)
        spin_unlock(&vmx_vpid_lock);
 }
 
+static void free_vpid(struct vcpu_vmx *vmx)
+{
+       if (!enable_vpid)
+               return;
+       spin_lock(&vmx_vpid_lock);
+       if (vmx->vpid != 0)
+               __clear_bit(vmx->vpid, vmx_vpid_bitmap);
+       spin_unlock(&vmx_vpid_lock);
+}
+
 static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
 {
        int f = sizeof(unsigned long);
@@ -3916,10 +3926,7 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
 {
        struct vcpu_vmx *vmx = to_vmx(vcpu);
 
-       spin_lock(&vmx_vpid_lock);
-       if (vmx->vpid != 0)
-               __clear_bit(vmx->vpid, vmx_vpid_bitmap);
-       spin_unlock(&vmx_vpid_lock);
+       free_vpid(vmx);
        vmx_free_vmcs(vcpu);
        kfree(vmx->guest_msrs);
        kvm_vcpu_uninit(vcpu);
@@ -3981,6 +3988,7 @@ free_msrs:
 uninit_vcpu:
        kvm_vcpu_uninit(&vmx->vcpu);
 free_vcpu:
+       free_vpid(vmx);
        kmem_cache_free(kvm_vcpu_cache, vmx);
        return ERR_PTR(err);
 }