From patchwork Tue Apr 15 06:14:09 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 3989261 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B263FBFF02 for ; Tue, 15 Apr 2014 06:18:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E5631201BC for ; Tue, 15 Apr 2014 06:18:17 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1057D2012D for ; Tue, 15 Apr 2014 06:18:17 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WZwer-0007dg-Pu; Tue, 15 Apr 2014 06:15:49 +0000 Received: from mail-pd0-f181.google.com ([209.85.192.181]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WZwel-0007ST-Jg for linux-arm-kernel@lists.infradead.org; Tue, 15 Apr 2014 06:15:43 +0000 Received: by mail-pd0-f181.google.com with SMTP id p10so9005004pdj.12 for ; Mon, 14 Apr 2014 23:15:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=fVsVaa8syE8NPd+uHI5k1f6jRRXAAvd5YN1FJQNdtJc=; b=I9bdYfT8vzzn00LJ4XektfjTF4r9DFW2ccd1RYbGwJ+d9NXMFEcme+TE0qcPnq6H1h kkpjWQTPlsLNmicmOdFgyoJq1i7C2Y6+rvKgCgGvuz78+Ag/mV6j6X6o2eNNM4U8xzYF I7/5AnAjLAH2HGsOVJmoMZ/V3jojhukSTUEoG3PxMLgbEXhFSIuKScflly0qRdnMzzFS y2/2jmkU7N5hE6CI9QeHCBd7oQTw/tuVcgXqZNRUJQSKiguZZ6HqXpnVGHLiJWto/peh qg9HChOWeoidtaTD9v4dBzpw0OHlRLXot29WSE9WlyBJwPgZ0JzYMbCZIZFGKBxNMocI DK1g== X-Gm-Message-State: ALoCoQnnFJsujiN2lLbMn979qgbDC+pZHJ/LRx9F9KPjqeTPlx7XhmFvcbzWIk+JgtF64TuglJUd X-Received: by 10.66.180.141 with SMTP id do13mr48399299pac.93.1397542522644; Mon, 14 Apr 2014 23:15:22 -0700 (PDT) Received: from pnqlab006.amcc.com ([182.73.239.130]) by mx.google.com with ESMTPSA id oz7sm37870688pbc.41.2014.04.14.23.15.16 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 14 Apr 2014 23:15:21 -0700 (PDT) From: Anup Patel To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v9 06/12] KVM: Add KVM_EXIT_SYSTEM_EVENT to user space API header Date: Tue, 15 Apr 2014 11:44:09 +0530 Message-Id: <1397542455-354-7-git-send-email-anup.patel@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1397542455-354-1-git-send-email-anup.patel@linaro.org> References: <1397542455-354-1-git-send-email-anup.patel@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140414_231543_682054_2315F532 X-CRM114-Status: GOOD ( 14.22 ) X-Spam-Score: 0.0 (/) Cc: Mark Rutland , Rob Herring , linaro-kernel@lists.linaro.org, Anup Patel , Marc Zyngier , patches@apm.com, Ashwin Chaugule , linux-arm-kernel@lists.infradead.org, Christoffer Dall , Pranavkumar Sawargaonkar X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently, we don't have an exit reason to notify user space about a system-level event (for e.g. system reset or shutdown) triggered by the VCPU. This patch adds exit reason KVM_EXIT_SYSTEM_EVENT for this purpose. We can also inform user space about the 'type' and architecture specific 'flags' of a system-level event using the kvm_run structure. This newly added KVM_EXIT_SYSTEM_EVENT will be used by KVM ARM/ARM64 in-kernel PSCI v0.2 support to reset/shutdown VMs. Signed-off-by: Anup Patel Signed-off-by: Pranavkumar Sawargaonkar Reviewed-by: Christoffer Dall Reviewed-by: Marc Zyngier --- Documentation/virtual/kvm/api.txt | 15 +++++++++++++++ include/uapi/linux/kvm.h | 8 ++++++++ 2 files changed, 23 insertions(+) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 6dc1db5..c02d725 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2740,6 +2740,21 @@ It gets triggered whenever both KVM_CAP_PPC_EPR are enabled and an external interrupt has just been delivered into the guest. User space should put the acknowledged interrupt vector into the 'epr' field. + /* KVM_EXIT_SYSTEM_EVENT */ + struct { +#define KVM_SYSTEM_EVENT_SHUTDOWN 1 +#define KVM_SYSTEM_EVENT_RESET 2 + __u32 type; + __u64 flags; + } system_event; + +If exit_reason is KVM_EXIT_SYSTEM_EVENT then the vcpu has triggered +a system-level event using some architecture specific mechanism (hypercall +or some special instruction). In case of ARM/ARM64, this is triggered using +HVC instruction based PSCI call from the vcpu. The 'type' field describes +the system-level event type. The 'flags' field describes architecture +specific flags for the system-level event. + /* Fix the size of the union. */ char padding[256]; }; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 01c5624..e86c36a 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -171,6 +171,7 @@ struct kvm_pit_config { #define KVM_EXIT_WATCHDOG 21 #define KVM_EXIT_S390_TSCH 22 #define KVM_EXIT_EPR 23 +#define KVM_EXIT_SYSTEM_EVENT 24 /* For KVM_EXIT_INTERNAL_ERROR */ /* Emulate instruction failed. */ @@ -301,6 +302,13 @@ struct kvm_run { struct { __u32 epr; } epr; + /* KVM_EXIT_SYSTEM_EVENT */ + struct { +#define KVM_SYSTEM_EVENT_SHUTDOWN 1 +#define KVM_SYSTEM_EVENT_RESET 2 + __u32 type; + __u64 flags; + } system_event; /* Fix the size of the union. */ char padding[256]; };