From: Mihai Donțu <[email protected]> All vCPU event replies contains the action requested by the introspection tool, which can be one of the following:
* KVMI_EVENT_ACTION_CONTINUE * KVMI_EVENT_ACTION_RETRY * KVMI_EVENT_ACTION_CRASH The CONTINUE action can be seen as "continue with the old KVM code path", while the RETRY action as "re-enter guest". Note: KVMI_EVENT_UNHOOK, a VM event, doesn't have/need a reply. Suggested-by: Paolo Bonzini <[email protected]> Signed-off-by: Mihai Donțu <[email protected]> Co-developed-by: Adalbert Lazăr <[email protected]> Signed-off-by: Adalbert Lazăr <[email protected]> --- Documentation/virtual/kvm/kvmi.rst | 10 ++++++++ include/uapi/linux/kvmi.h | 4 +++ kernel/signal.c | 1 + virt/kvm/kvmi.c | 40 ++++++++++++++++++++++++++++++ 4 files changed, 55 insertions(+) diff --git a/Documentation/virtual/kvm/kvmi.rst b/Documentation/virtual/kvm/kvmi.rst index e7d9a3816e00..1ea4be0d5a45 100644 --- a/Documentation/virtual/kvm/kvmi.rst +++ b/Documentation/virtual/kvm/kvmi.rst @@ -482,4 +482,14 @@ with two common structures:: __u32 padding2; }; +All events accept the KVMI_EVENT_ACTION_CRASH action, which stops the +guest ungracefully but as soon as possible. + +Most of the events accept the KVMI_EVENT_ACTION_CONTINUE action, which +lets the instruction that caused the event to continue (unless specified +otherwise). + +Some of the events accept the KVMI_EVENT_ACTION_RETRY action, to continue +by re-entering the guest. + Specific data can follow these common structures. diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h index dda2ae352611..ccf2239b5db4 100644 --- a/include/uapi/linux/kvmi.h +++ b/include/uapi/linux/kvmi.h @@ -66,6 +66,10 @@ enum { KVMI_NUM_EVENTS }; +#define KVMI_EVENT_ACTION_CONTINUE 0 +#define KVMI_EVENT_ACTION_RETRY 1 +#define KVMI_EVENT_ACTION_CRASH 2 + #define KVMI_MSG_SIZE (4096 - sizeof(struct kvmi_msg_hdr)) struct kvmi_msg_hdr { diff --git a/kernel/signal.c b/kernel/signal.c index 57b7771e20d7..9befbfaaa710 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1413,6 +1413,7 @@ int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid) */ } } +EXPORT_SYMBOL(kill_pid_info); static int kill_proc_info(int sig, struct kernel_siginfo *info, pid_t pid) { diff --git a/virt/kvm/kvmi.c b/virt/kvm/kvmi.c index 3cc7bb035796..0d3560b74f2d 100644 --- a/virt/kvm/kvmi.c +++ b/virt/kvm/kvmi.c @@ -511,6 +511,46 @@ void kvmi_destroy_vm(struct kvm *kvm) wait_for_completion_killable(&kvm->kvmi_completed); } +static int kvmi_vcpu_kill(int sig, struct kvm_vcpu *vcpu) +{ + int err = -ESRCH; + struct pid *pid; + struct kernel_siginfo siginfo[1] = {}; + + rcu_read_lock(); + pid = rcu_dereference(vcpu->pid); + if (pid) + err = kill_pid_info(sig, siginfo, pid); + rcu_read_unlock(); + + return err; +} + +static void kvmi_vm_shutdown(struct kvm *kvm) +{ + int i; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(i, vcpu, kvm) + kvmi_vcpu_kill(SIGTERM, vcpu); +} + +void kvmi_handle_common_event_actions(struct kvm_vcpu *vcpu, u32 action, + const char *str) +{ + struct kvm *kvm = vcpu->kvm; + + switch (action) { + case KVMI_EVENT_ACTION_CRASH: + kvmi_vm_shutdown(kvm); + break; + + default: + kvmi_err(IKVM(kvm), "Unsupported action %d for event %s\n", + action, str); + } +} + void kvmi_run_jobs(struct kvm_vcpu *vcpu) { struct kvmi_vcpu *ivcpu = IVCPU(vcpu); _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
