From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AA7EC433DB for ; Tue, 9 Feb 2021 04:24:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E869064E4F for ; Tue, 9 Feb 2021 04:24:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230197AbhBIEXX (ORCPT ); Mon, 8 Feb 2021 23:23:23 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:30280 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230097AbhBIDxQ (ORCPT ); Mon, 8 Feb 2021 22:53:16 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1612842691; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iEhGG0hnD1JDiId4QQ1JcUjDqHGQb063cTr4+JPyYkw=; b=R0+nCnZLHNp9vDGSD28qIgOz0X2D4H8F32U7p1b0FCTQzFH0dhGAwoK/fr3mPmYPE2DJ/T 85d0ukiTepKvTi9ZClde9ImXvY86rkrWhdCgRjSsmuqraRzeCWbChIadtLE02rUq7eBxnk U+f/pnBa2cJxqJG31KP8KX2e3axijvU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-425-HE7eBEqhM2qfe_Qp4VFXag-1; Mon, 08 Feb 2021 22:28:26 -0500 X-MC-Unique: HE7eBEqhM2qfe_Qp4VFXag-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4E75B192D785; Tue, 9 Feb 2021 03:28:25 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-26.bne.redhat.com [10.64.54.26]) by smtp.corp.redhat.com (Postfix) with ESMTP id 69AB619C66; Tue, 9 Feb 2021 03:28:22 +0000 (UTC) From: Gavin Shan To: kvmarm@lists.cs.columbia.edu Cc: linux-kernel@vger.kernel.org, pbonzini@redhat.com, maz@kernel.org, james.morse@arm.com, Jonathan.Cameron@huawei.com, mark.rutland@arm.com, will@kernel.org, shan.gavin@gmail.com Subject: [PATCH v2 07/21] KVM: arm64: Support SDEI_EVENT_UNREGISTER hypercall Date: Tue, 9 Feb 2021 11:27:19 +0800 Message-Id: <20210209032733.99996-8-gshan@redhat.com> In-Reply-To: <20210209032733.99996-1-gshan@redhat.com> References: <20210209032733.99996-1-gshan@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This supports SDEI_EVENT_UNREGISTER hypercall. It's used by the guest to unregister SDEI event. The SDEI event won't be raised to the guest or specific vCPU after it's unregistered successfully. It's notable the SDEI event is disabled automatically on the guest or specific vCPU once it's unregistered successfully. Signed-off-by: Gavin Shan --- arch/arm64/kvm/sdei.c | 61 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c index b4162efda470..a3ba69dc91cb 100644 --- a/arch/arm64/kvm/sdei.c +++ b/arch/arm64/kvm/sdei.c @@ -308,6 +308,65 @@ static unsigned long kvm_sdei_hypercall_context(struct kvm_vcpu *vcpu) return ret; } +static unsigned long kvm_sdei_hypercall_unregister(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_sdei_kvm *ksdei = kvm->arch.sdei; + struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei; + struct kvm_sdei_event *kse = NULL; + struct kvm_sdei_kvm_event *kske = NULL; + unsigned long event_num = smccc_get_arg1(vcpu); + int index = 0; + unsigned long ret = SDEI_SUCCESS; + + /* Sanity check */ + if (!(ksdei && vsdei)) { + ret = SDEI_NOT_SUPPORTED; + goto out; + } + + if (!kvm_sdei_is_valid_event_num(event_num)) { + ret = SDEI_INVALID_PARAMETERS; + goto out; + } + + /* Check if the KVM event exists */ + spin_lock(&ksdei->lock); + kske = kvm_sdei_find_kvm_event(kvm, event_num); + if (!kske) { + ret = SDEI_INVALID_PARAMETERS; + goto unlock; + } + + /* Check if there is pending events */ + if (kske->state.refcount) { + ret = SDEI_PENDING; + goto unlock; + } + + /* Check if it has been registered */ + kse = kske->kse; + index = (kse->state.type == SDEI_EVENT_TYPE_PRIVATE) ? + vcpu->vcpu_idx : 0; + if (!kvm_sdei_is_registered(kske, index)) { + ret = SDEI_DENIED; + goto unlock; + } + + /* The event is disabled when it's unregistered */ + kvm_sdei_clear_enabled(kske, index); + kvm_sdei_clear_registered(kske, index); + if (kvm_sdei_empty_registered(kske)) { + list_del(&kske->link); + kfree(kske); + } + +unlock: + spin_unlock(&ksdei->lock); +out: + return ret; +} + int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) { u32 func = smccc_get_function(vcpu); @@ -333,6 +392,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) case SDEI_1_0_FN_SDEI_EVENT_COMPLETE: case SDEI_1_0_FN_SDEI_EVENT_COMPLETE_AND_RESUME: case SDEI_1_0_FN_SDEI_EVENT_UNREGISTER: + ret = kvm_sdei_hypercall_unregister(vcpu); + break; case SDEI_1_0_FN_SDEI_EVENT_STATUS: case SDEI_1_0_FN_SDEI_EVENT_GET_INFO: case SDEI_1_0_FN_SDEI_EVENT_ROUTING_SET: -- 2.23.0