KVM: make processes waiting on vcpu mutex killable

vcpu mutex can be held for unlimited time so
taking it with mutex_lock on an ioctl is wrong:
one process could be passed a vcpu fd and
call this ioctl on the vcpu used by another process,
it will then be unkillable until the owner exits.

Call mutex_lock_killable instead and return status.
Note: mutex_lock_interruptible would be even nicer,
but I am not sure all users are prepared to handle EINTR
from these ioctls. They might misinterpret it as an error.

Cleanup paths expect a vcpu that can't be used by
any userspace so this will always succeed - catch bugs
by calling BUG_ON.

Catch callers that don't check return state by adding
__must_check.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

3 files changed, 17 insertions, 7 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c4d451ed1573..19047eafa38d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6016,7 +6016,9 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
         int r;
 
         vcpu->arch.mtrr_state.have_fixed = 1;
-        vcpu_load(vcpu);
+        r = vcpu_load(vcpu);
+        if (r)
+                return r;
         r = kvm_arch_vcpu_reset(vcpu);
         if (r == 0)
                 r = kvm_mmu_setup(vcpu);
@@ -6027,9 +6029,11 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
+        int r;
         vcpu->arch.apf.msr_val = 0;
 
-        vcpu_load(vcpu);
+        r = vcpu_load(vcpu);
+        BUG_ON(r);
         kvm_mmu_unload(vcpu);
         vcpu_put(vcpu);
 
@@ -6275,7 +6279,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 
 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
 {
-        vcpu_load(vcpu);
+        int r;
+        r = vcpu_load(vcpu);
+        BUG_ON(r);
         kvm_mmu_unload(vcpu);
         vcpu_put(vcpu);
 }
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 40791930bc15..80bfc880921e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -408,7 +408,7 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
 
-void vcpu_load(struct kvm_vcpu *vcpu);
+int __must_check vcpu_load(struct kvm_vcpu *vcpu);
 void vcpu_put(struct kvm_vcpu *vcpu);
 
 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4fe02d900810..cc3f6dc506e4 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -131,11 +131,12 @@ bool kvm_is_mmio_pfn(pfn_t pfn)
 /*
  * Switches to specified vcpu, until a matching vcpu_put()
  */
-void vcpu_load(struct kvm_vcpu *vcpu)
+int vcpu_load(struct kvm_vcpu *vcpu)
 {
         int cpu;
 
-        mutex_lock(&vcpu->mutex);
+        if (mutex_lock_killable(&vcpu->mutex))
+                return -EINTR;
         if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
                 /* The thread running this VCPU changed. */
                 struct pid *oldpid = vcpu->pid;
@@ -148,6 +149,7 @@ void vcpu_load(struct kvm_vcpu *vcpu)
         preempt_notifier_register(&vcpu->preempt_notifier);
         kvm_arch_vcpu_load(vcpu, cpu);
         put_cpu();
+        return 0;
 }
 
 void vcpu_put(struct kvm_vcpu *vcpu)
@@ -1891,7 +1893,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
 #endif
 
 
-        vcpu_load(vcpu);
+        r = vcpu_load(vcpu);
+        if (r)
+                return r;
         switch (ioctl) {
         case KVM_RUN:
                 r = -EINVAL;