Capture the start of the KVM VM, which is basically the
start of any vCPU run. This state of the VM is helpful
in the upcoming patches to prevent user-space from
configuring certain VM features after the VM has started
running.
Signed-off-by: Raghavendra Rao Ananta <rananta@xxxxxxxxxx>
---
include/linux/kvm_host.h | 3 +++
virt/kvm/kvm_main.c | 9 +++++++++
2 files changed, 12 insertions(+)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c310648cc8f1..d0bd8f7a026c 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -623,6 +623,7 @@ struct kvm {
struct notifier_block pm_notifier;
#endif
char stats_id[KVM_STATS_NAME_SIZE];
+ bool vm_started;
};
#define kvm_err(fmt, ...) \
@@ -1666,6 +1667,8 @@ static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
}
}
+#define kvm_vm_has_started(kvm) (kvm->vm_started)
+
extern bool kvm_rebooting;
extern unsigned int halt_poll_ns;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 72c4e6b39389..962b91ac2064 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3686,6 +3686,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
int r;
struct kvm_fpu *fpu = NULL;
struct kvm_sregs *kvm_sregs = NULL;
+ struct kvm *kvm = vcpu->kvm;
if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_dead)
return -EIO;
@@ -3723,6 +3724,14 @@ static long kvm_vcpu_ioctl(struct file *filp,
if (oldpid)
synchronize_rcu();
put_pid(oldpid);
+
+ /*
+ * Since we land here even on the first vCPU run,
+ * we can mark that the VM has started running.
+ */
+ mutex_lock(&kvm->lock);
+ kvm->vm_started = true;
+ mutex_unlock(&kvm->lock);
}
r = kvm_arch_vcpu_ioctl_run(vcpu);
trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
--
2.34.1.448.ga2b2bfdf31-goog
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