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[91.199.104.161]) by mx.google.com with ESMTPS id y13si8316632wrp.174.2019.08.09.09.00.58 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Aug 2019 09:00:59 -0700 (PDT) Received-SPF: pass (google.com: domain of alazar@bitdefender.com designates 91.199.104.161 as permitted sender) client-ip=91.199.104.161; Authentication-Results: mx.google.com; spf=pass (google.com: domain of alazar@bitdefender.com designates 91.199.104.161 as permitted sender) smtp.mailfrom=alazar@bitdefender.com Received: from smtp.bitdefender.com (smtp02.buh.bitdefender.net [10.17.80.76]) by mx01.bbu.dsd.mx.bitdefender.com (Postfix) with ESMTPS id 57BB6305D3D8; Fri, 9 Aug 2019 19:00:58 +0300 (EEST) Received: from localhost.localdomain (unknown [89.136.169.210]) by smtp.bitdefender.com (Postfix) with ESMTPSA id 1301E305B7A4; Fri, 9 Aug 2019 19:00:58 +0300 (EEST) From: =?UTF-8?q?Adalbert=20Laz=C4=83r?= To: kvm@vger.kernel.org Cc: linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Konrad Rzeszutek Wilk , Tamas K Lengyel , Mathieu Tarral , =?UTF-8?q?Samuel=20Laur=C3=A9n?= , Patrick Colp , Jan Kiszka , Stefan Hajnoczi , Weijiang Yang , Zhang@kvack.org, Yu C , =?UTF-8?q?Mihai=20Don=C8=9Bu?= , =?UTF-8?q?Adalbert=20Laz=C4=83r?= Subject: [RFC PATCH v6 17/92] kvm: introspection: introduce event actions Date: Fri, 9 Aug 2019 18:59:32 +0300 Message-Id: <20190809160047.8319-18-alazar@bitdefender.com> In-Reply-To: <20190809160047.8319-1-alazar@bitdefender.com> References: <20190809160047.8319-1-alazar@bitdefender.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Mihai Donțu 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 Signed-off-by: Mihai Donțu Co-developed-by: Adalbert Lazăr Signed-off-by: Adalbert Lazăr --- 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);