search for: kvmi_ref

...else { diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 52e98720d0f6..d2d9b814093e 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -505,6 +505,8 @@ struct kvm { struct srcu_struct irq_srcu; pid_t userspace_pid; struct mutex kvmi_lock; + refcount_t kvmi_ref; + struct completion kvmi_complete; struct kvm_introspection *kvmi; }; diff --git a/include/linux/kvmi_host.h b/include/linux/kvmi_host.h index 1d80d233fbd5..6a0fb481b192 100644 --- a/include/linux/kvmi_host.h +++ b/include/linux/kvmi_host.h @@ -56,6 +56,8 @@ int kvmi_ioctl_command(struct kvm...

...b7e73..582b0187f5a4 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -455,6 +455,10 @@ struct kvm { > struct srcu_struct srcu; > struct srcu_struct irq_srcu; > pid_t userspace_pid; > + > + struct completion kvmi_completed; > + refcount_t kvmi_ref; The refcounting approach seems a bit backwards, and AFAICT is driven by implementing unhook via a message, which also seems backwards. I assume hook and unhook are relatively rare events and not performance critical, so make those the restricted/slow flows, e.g. force userspace to quiesce the VM...

...es are linked and no pointer > + * is read as NULL after the reference count has been set. > + */ > + smp_mb__before_atomic(); This is an smp_wmb(), not an smp_mb__before_atomic(). Add a comment that it pairs with the refcount_inc_not_zero in kvmi_get. > + refcount_set(&kvm->kvmi_ref, 1); > + > @@ -57,8 +183,27 @@ void kvmi_destroy_vm(struct kvm *kvm) > if (!ikvm) > return; > > + /* trigger socket shutdown - kvmi_recv() will start shutdown process */ > + kvmi_sock_shutdown(ikvm); > + > kvmi_put(kvm); > > /* wait for introspection...

...st.h b/include/linux/kvm_host.h index c38cc5eb7e73..582b0187f5a4 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -455,6 +455,10 @@ struct kvm { struct srcu_struct srcu; struct srcu_struct irq_srcu; pid_t userspace_pid; + + struct completion kvmi_completed; + refcount_t kvmi_ref; + void *kvmi; }; #define kvm_err(fmt, ...) \ diff --git a/include/linux/kvmi.h b/include/linux/kvmi.h new file mode 100644 index 000000000000..e36de3f9f3de --- /dev/null +++ b/include/linux/kvmi.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __KVMI_H__ +#define __KVMI_H__...

...sizeof(*ikvm), GFP_KERNEL); + if (!ikvm) + return false; + + memcpy(&ikvm->uuid, &qemu->uuid, sizeof(ikvm->uuid)); + + ikvm->kvm = kvm; + kvm->kvmi = ikvm; + + return true; +} + struct kvmi * __must_check kvmi_get(struct kvm *kvm) { if (refcount_inc_not_zero(&kvm->kvmi_ref)) @@ -27,10 +45,13 @@ struct kvmi * __must_check kvmi_get(struct kvm *kvm) static void kvmi_destroy(struct kvm *kvm) { + kfree(kvm->kvmi); + kvm->kvmi = NULL; } static void kvmi_release(struct kvm *kvm) { + kvmi_sock_put(IKVM(kvm)); kvmi_destroy(kvm); complete(&kvm->kvmi...

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VMs (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VMs (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place