KVM: x86: Add missing locking to arch specific vcpu ioctls

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

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f0846d2aa956..39f495802050 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1833,6 +1833,7 @@ static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
 {
         int r;
 
+        vcpu_load(vcpu);
         r = -E2BIG;
         if (cpuid->nent < vcpu->arch.cpuid_nent)
                 goto out;
@@ -1844,6 +1845,7 @@ static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
 
 out:
         cpuid->nent = vcpu->arch.cpuid_nent;
+        vcpu_put(vcpu);
         return r;
 }
 
@@ -2134,6 +2136,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
         int r;
         unsigned bank_num = mcg_cap & 0xff, bank;
 
+        vcpu_load(vcpu);
         r = -EINVAL;
         if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
                 goto out;
@@ -2148,6 +2151,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
         for (bank = 0; bank < bank_num; bank++)
                 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
 out:
+        vcpu_put(vcpu);
         return r;
 }
 
@@ -2456,7 +2460,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
                 r = -EFAULT;
                 if (copy_from_user(&mce, argp, sizeof mce))
                         goto out;
+                vcpu_load(vcpu);
                 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
+                vcpu_put(vcpu);
                 break;
         }
         case KVM_GET_VCPU_EVENTS: {