From patchwork Fri Aug 9 16:00:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Adalbert_Laz=C4=83r?= X-Patchwork-Id: 11086987 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EAAF96C5 for ; Fri, 9 Aug 2019 16:06:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D5E2C200DF for ; Fri, 9 Aug 2019 16:06:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C9CFF2018F; Fri, 9 Aug 2019 16:06:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1883A200DF for ; Fri, 9 Aug 2019 16:06:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 069016B02F3; Fri, 9 Aug 2019 12:03:36 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 01A366B02F5; Fri, 9 Aug 2019 12:03:35 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E729F6B02F6; Fri, 9 Aug 2019 12:03:35 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by kanga.kvack.org (Postfix) with ESMTP id 93F096B02F3 for ; Fri, 9 Aug 2019 12:03:35 -0400 (EDT) Received: by mail-wm1-f72.google.com with SMTP id s19so1065690wmc.7 for ; Fri, 09 Aug 2019 09:03:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=7mcumJBqdazdFc0uiihrbxjc9n4H1WzR9co/oSUGg5w=; b=mF3OYTsQS1kWvRY0Vzvi7LfB+Ff7+4tAPJKgebP58UZK0WswOVpB0cpcQtn186mleh MwNy6Oi6te8ackyGl1OPkR1x0mtNScmTrhIGyM7uVxPcXpLSroVlEHGgvIlUvClz0Yoc iwvpexG3r1T79A5iYjaWGaDw9RRLSenQlk3p+w4mrpCMDM1/QTGZVqUhx/ALP20CeRGX JKTVihvKs/B/eomxJaeQblE9jqKGz6gaY+/hH05MAdnaDlyeQ52boSOlesFffiX+Lj4V 3ud16fbN9PVfSpBhHXzfJ1Avji4CNHC9nDq11GRvqSntBWO/LMeJ4iTecqx2V4gKlZ0w hFEA== X-Original-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 X-Gm-Message-State: APjAAAWvxrhJaairZJjgsHs1xj6p39Kblt2RG/i4F4R0ABDxvZP7lEyp fEMg0wLjtCh9oC5+YQ+v+llVEqdHG7N83YOnU1wzlqxrkeSxpf7Ue3x4N2vJzN607fiDKN0LzRJ zZ+3czC7mOQxbEpQXA3gT3MtyvRg/TVjOE9alWD1O1e6VHKRQX/5jp1gzhtLTcVxCNA== X-Received: by 2002:a7b:c212:: with SMTP id x18mr11507413wmi.77.1565366614684; Fri, 09 Aug 2019 09:03:34 -0700 (PDT) X-Google-Smtp-Source: APXvYqw3yN+5UApJ/Js8lqaii3GIip6VDDjE9SEeFvazhgzeYBrC8PmEm+COIOmsgINlVCiyMTib X-Received: by 2002:a7b:c212:: with SMTP id x18mr11495308wmi.77.1565366489252; Fri, 09 Aug 2019 09:01:29 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1565366489; cv=none; d=google.com; s=arc-20160816; b=KOSAnsgYRu8WtWcROcEdQgnes8z3qk/11KJqHwtZT0RTum19lLcerLmOQ+p9EFteX4 57nX38giIKF+VZKTk7B/PMPixeHe83BDGyU+XV1QuU7tDlzeqEQmsjr98D63TWINBEHO 33QbSvbHqBJNaFVlnNnMeOA6N2WMG+z0TE3rhyO9McIASWFFlO9bM9FL14EcPwI6kdSE EIAhlxa6QglVdYF0w8KX414WBZFi8COFwtDrVOri5iYqoZ+oOmEDghcHyD0uZit5vWYo 7KPMktG4k33L8f+9ykPK2+2PlpESGCa7umcB6JurjI0qyXhXt4pNpPNsXylfg7wpTeFO mYGg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from; bh=7mcumJBqdazdFc0uiihrbxjc9n4H1WzR9co/oSUGg5w=; b=0ipbN507UuK6nmGfMbcSXO00LG6grtbNd5aGrT2XPQ1LFUF+LKAxgzACheBeM1sZEi FPjhbFb3eg6v9HunKrhei1fcL6AS0+oEgannGI+j36QsHu5NuYEtkqEvMvyUP+4zCTme WcqqcuOpH+Vw89btsc9ozucn7cWSFSmax9W9jgutKJKaKoK85DbNahgx+Zlr5uv4x5C2 sPCsVYsLkcxJ3rbXC5huYv5QkRgT3+Lr+0G6XDoKz2d/QLqUmRJDbdElD2PDP3qRLKFu dEhAxOXu/c7jdc6iJQmhv1zo2L4xqY/AT8Xbri6iffwLZDJgkqqHKdQIbxfgp7m4/Xmp zMVw== ARC-Authentication-Results: i=1; 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 mx01.bbu.dsd.mx.bitdefender.com (mx01.bbu.dsd.mx.bitdefender.com. [91.199.104.161]) by mx.google.com with ESMTPS id p1si86566151wrn.142.2019.08.09.09.01.29 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Aug 2019 09:01:29 -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 A22CB305D356; Fri, 9 Aug 2019 19:01:28 +0300 (EEST) Received: from localhost.localdomain (unknown [89.136.169.210]) by smtp.bitdefender.com (Postfix) with ESMTPSA id 58C85305B7A3; Fri, 9 Aug 2019 19:01:28 +0300 (EEST) From: =?utf-8?q?Adalbert_Laz=C4=83r?= To: kvm@vger.kernel.org Cc: linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Konrad Rzeszutek Wilk , Tamas K Lengyel , Mathieu Tarral , =?utf-8?q?Samuel_Laur=C3=A9?= =?utf-8?q?n?= , Patrick Colp , Jan Kiszka , Stefan Hajnoczi , Weijiang Yang , Zhang@kvack.org, Yu C , =?utf-8?q?Mihai_Don=C8=9Bu?= , =?utf-8?q?Adalbert_L?= =?utf-8?q?az=C4=83r?= , =?utf-8?b?TmljdciZb3IgQ8Ou?= =?utf-8?b?yJt1?= Subject: [RFC PATCH v6 65/92] kvm: introspection: add KVMI_EVENT_SINGLESTEP Date: Fri, 9 Aug 2019 19:00:20 +0300 Message-Id: <20190809160047.8319-66-alazar@bitdefender.com> In-Reply-To: <20190809160047.8319-1-alazar@bitdefender.com> References: <20190809160047.8319-1-alazar@bitdefender.com> MIME-Version: 1.0 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: X-Virus-Scanned: ClamAV using ClamSMTP From: Nicușor Cîțu This event is sent when the current instruction has been single stepped as a result of a KVMI_EVENT_PF event to which the introspection tool set the singlestep field and responded with CONTINUE. Signed-off-by: Nicușor Cîțu Signed-off-by: Adalbert Lazăr --- Documentation/virtual/kvm/kvmi.rst | 25 +++++++++++++++++++ virt/kvm/kvmi.c | 40 ++++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+) diff --git a/Documentation/virtual/kvm/kvmi.rst b/Documentation/virtual/kvm/kvmi.rst index 8721a470de87..572abab1f6ef 100644 --- a/Documentation/virtual/kvm/kvmi.rst +++ b/Documentation/virtual/kvm/kvmi.rst @@ -1574,3 +1574,28 @@ introspection has been enabled for this event (see **KVMI_CONTROL_EVENTS**). KVMI_DESC_TR ``write`` is 1 if the descriptor was written, 0 otherwise. + +12. KVMI_EVENT_SINGLESTEP +------------------------- + +:Architectures: x86 +:Versions: >= 1 +:Actions: CONTINUE, CRASH +:Parameters: + +:: + + struct kvmi_event; + +:Returns: + +:: + + struct kvmi_vcpu_hdr; + struct kvmi_event_reply; + +This event is sent when the current instruction has been executed +(as a result of a *KVMI_EVENT_PF* event to which the introspection +tool set the ``singlestep`` field and responded with *CONTINUE*) +and the introspection has been enabled for this event +(see **KVMI_CONTROL_EVENTS**). diff --git a/virt/kvm/kvmi.c b/virt/kvm/kvmi.c index a3a5af9080a9..3dfedf3ae739 100644 --- a/virt/kvm/kvmi.c +++ b/virt/kvm/kvmi.c @@ -1182,6 +1182,44 @@ void kvmi_trap_event(struct kvm_vcpu *vcpu) kvmi_put(vcpu->kvm); } +static u32 kvmi_send_singlestep(struct kvm_vcpu *vcpu) +{ + int err, action; + + err = kvmi_send_event(vcpu, KVMI_EVENT_SINGLESTEP, NULL, 0, + NULL, 0, &action); + if (err) + return KVMI_EVENT_ACTION_CONTINUE; + + return action; +} + +static void __kvmi_singlestep_event(struct kvm_vcpu *vcpu) +{ + u32 action; + + action = kvmi_send_singlestep(vcpu); + switch (action) { + case KVMI_EVENT_ACTION_CONTINUE: + break; + default: + kvmi_handle_common_event_actions(vcpu, action, "SINGLESTEP"); + } +} + +static void kvmi_singlestep_event(struct kvm_vcpu *vcpu) +{ + struct kvmi_vcpu *ivcpu = IVCPU(vcpu); + + if (!ivcpu->ss_requested) + return; + + if (is_event_enabled(vcpu, KVMI_EVENT_SINGLESTEP)) + __kvmi_singlestep_event(vcpu); + + ivcpu->ss_requested = false; +} + static bool __kvmi_create_vcpu_event(struct kvm_vcpu *vcpu) { u32 action; @@ -1616,6 +1654,8 @@ void kvmi_stop_ss(struct kvm_vcpu *vcpu) ivcpu->ss_owner = false; + kvmi_singlestep_event(vcpu); + out: kvmi_put(kvm); }