From patchwork Thu Dec 12 16:12:26 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 3333331 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 D2277C0D4A for ; Thu, 12 Dec 2013 17:07:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 907AE207C3 for ; Thu, 12 Dec 2013 17:07:34 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (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 C19A2206CB for ; Thu, 12 Dec 2013 17:07:29 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vr8vb-0005sk-GH; Thu, 12 Dec 2013 16:15:56 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vr8us-0001aT-5U; Thu, 12 Dec 2013 16:15:10 +0000 Received: from mail-pd0-f175.google.com ([209.85.192.175]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vr8ta-0001S4-D0 for linux-arm-kernel@lists.infradead.org; Thu, 12 Dec 2013 16:13:53 +0000 Received: by mail-pd0-f175.google.com with SMTP id w10so744365pde.34 for ; Thu, 12 Dec 2013 08:13:28 -0800 (PST) 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=uiQ2JFUAy61BbhBkQWvuYDm4FOUqkCyeywysHtQrkJM=; b=QlQaYfyyHN7mIT0ddrG8Co1zSzYCf5PsM7GiwE4vabzobwbQ4TFC14kJy3QYnW9jbO qJ8Bds2/T1h7IdnOh6WHnWYmQhZnNNt7ecUkWEmnnLn1C914NxAfkW3P/UEh+JvB5SVa Rql8g+8I1r9jeGYY7FGkIQorDaZkzpJ45PaoveQPfaE9g9qVhne0PrKTpentS4YovMxV TfKcqSQruzYiYBipuUhVgh1ywMj5Q4vK2l6G36oMouW4Nce7LHI0lo++FA12VAJ8aKdI dnIA8GdE6AcLHNB1WImitDWkodImgrjsjKJY8/zC68bK5oefiqZZurFUedjWEwN8cv7w HQeA== X-Gm-Message-State: ALoCoQnVE7/ijCTKlQwDXf+X//K8CG6JOixTiS/ePwBarLK3v+F4s9nrbP4sdvRGPMiFgCLJCUSc X-Received: by 10.68.209.133 with SMTP id mm5mr13453160pbc.157.1386864808753; Thu, 12 Dec 2013 08:13:28 -0800 (PST) Received: from pnqlab006.amcc.com ([182.73.239.130]) by mx.google.com with ESMTPSA id jk16sm41193694pbb.34.2013.12.12.08.13.24 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 12 Dec 2013 08:13:27 -0800 (PST) From: Anup Patel To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v2 1/2] KVM: Add KVM_EXIT_SYSTEM_EVENT to user space API header Date: Thu, 12 Dec 2013 21:42:26 +0530 Message-Id: <1386864747-29006-5-git-send-email-anup.patel@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1386864747-29006-1-git-send-email-anup.patel@linaro.org> References: <1386864747-29006-1-git-send-email-anup.patel@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131212_111350_605336_A9E2429B X-CRM114-Status: GOOD ( 13.34 ) X-Spam-Score: -1.9 (-) Cc: linaro-kernel@lists.linaro.org, Anup Patel , patches@linaro.org, Marc Zyngier , patches@apm.com, 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=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 support to reset/shutdown VMs. Signed-off-by: Anup Patel Signed-off-by: Pranavkumar Sawargaonkar Reviewed-by: Christoffer Dall --- 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 aad3244..4ef180e 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2699,6 +2699,21 @@ 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 902f124..bb13faa 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]; };