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=-16.5 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 5552BC4320A for ; Sun, 15 Aug 2021 00:16:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3BC7160E76 for ; Sun, 15 Aug 2021 00:16:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236356AbhHOAQc (ORCPT ); Sat, 14 Aug 2021 20:16:32 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:38348 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235029AbhHOAP6 (ORCPT ); Sat, 14 Aug 2021 20:15:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1628986528; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sW1X3gp7m/GFtVG+z9c8/k60gef/0uXdphaW+9SFdnQ=; b=eFdzhEejphhI3KvYKil9Tt8dk1JUtPNFWi3mK/VeOus4DF5+CZ1vlDT+u8UYbnxm5mpFvo rsEH2qiNJabTPcmvnwzeP3G3FJiDJyDsjgLf9Pk0z2jMRmePEbTR3Fwq1JGJPUjX6vjno/ 70w3MhiN41IW8fyQn/ceJEH53LBo35s= 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-232-XoiDwPOUOyaoGvvTFvid5w-1; Sat, 14 Aug 2021 20:15:27 -0400 X-MC-Unique: XoiDwPOUOyaoGvvTFvid5w-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E897187122E; Sun, 15 Aug 2021 00:15:25 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-103.bne.redhat.com [10.64.54.103]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C70DD10016FF; Sun, 15 Aug 2021 00:15:22 +0000 (UTC) From: Gavin Shan To: kvmarm@lists.cs.columbia.edu Cc: linux-kernel@vger.kernel.org, james.morse@arm.com, mark.rutland@arm.com, Jonathan.Cameron@huawei.com, will@kernel.org, maz@kernel.org, pbonzini@redhat.com Subject: [PATCH v4 15/21] KVM: arm64: Support SDEI event notifier Date: Sun, 15 Aug 2021 08:13:46 +0800 Message-Id: <20210815001352.81927-16-gshan@redhat.com> In-Reply-To: <20210815001352.81927-1-gshan@redhat.com> References: <20210815001352.81927-1-gshan@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The owner of the SDEI event, like asynchronous page fault, need know the state of injected SDEI event. This supports SDEI event state updating by introducing notifier mechanism. It's notable the notifier (handler) should be capable of migration. Signed-off-by: Gavin Shan --- arch/arm64/include/asm/kvm_sdei.h | 12 +++++++ arch/arm64/include/uapi/asm/kvm_sdei.h | 1 + arch/arm64/kvm/sdei.c | 45 +++++++++++++++++++++++++- 3 files changed, 57 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_sdei.h b/arch/arm64/include/asm/kvm_sdei.h index 7f5f5ad689e6..19f2d9b91f85 100644 --- a/arch/arm64/include/asm/kvm_sdei.h +++ b/arch/arm64/include/asm/kvm_sdei.h @@ -16,6 +16,16 @@ #include #include +struct kvm_vcpu; + +typedef void (*kvm_sdei_notifier)(struct kvm_vcpu *vcpu, + unsigned long num, + unsigned int state); +enum { + KVM_SDEI_NOTIFY_DELIVERED, + KVM_SDEI_NOTIFY_COMPLETED, +}; + struct kvm_sdei_event { struct kvm_sdei_event_state state; struct kvm *kvm; @@ -112,6 +122,8 @@ KVM_SDEI_FLAG_FUNC(enabled) void kvm_sdei_init_vm(struct kvm *kvm); void kvm_sdei_create_vcpu(struct kvm_vcpu *vcpu); int kvm_sdei_hypercall(struct kvm_vcpu *vcpu); +int kvm_sdei_register_notifier(struct kvm *kvm, unsigned long num, + kvm_sdei_notifier notifier); void kvm_sdei_deliver(struct kvm_vcpu *vcpu); void kvm_sdei_destroy_vcpu(struct kvm_vcpu *vcpu); void kvm_sdei_destroy_vm(struct kvm *kvm); diff --git a/arch/arm64/include/uapi/asm/kvm_sdei.h b/arch/arm64/include/uapi/asm/kvm_sdei.h index 8928027023f6..4ef661d106fe 100644 --- a/arch/arm64/include/uapi/asm/kvm_sdei.h +++ b/arch/arm64/include/uapi/asm/kvm_sdei.h @@ -23,6 +23,7 @@ struct kvm_sdei_event_state { __u8 type; __u8 signaled; __u8 priority; + __u64 notifier; }; struct kvm_sdei_kvm_event_state { diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c index 1e8e213c9d70..5f7a37dcaa77 100644 --- a/arch/arm64/kvm/sdei.c +++ b/arch/arm64/kvm/sdei.c @@ -314,9 +314,11 @@ static unsigned long kvm_sdei_hypercall_complete(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; struct kvm_sdei_vcpu_event *ksve = NULL; struct kvm_sdei_vcpu_regs *regs; + kvm_sdei_notifier notifier; unsigned long ret = SDEI_SUCCESS; int index; @@ -349,6 +351,13 @@ static unsigned long kvm_sdei_hypercall_complete(struct kvm_vcpu *vcpu, *vcpu_cpsr(vcpu) = regs->pstate; *vcpu_pc(vcpu) = regs->pc; + /* Notifier */ + kske = ksve->kske; + kse = kske->kse; + notifier = (kvm_sdei_notifier)(kse->state.notifier); + if (notifier) + notifier(vcpu, kse->state.num, KVM_SDEI_NOTIFY_COMPLETED); + /* Inject interrupt if needed */ if (resume) kvm_inject_irq(vcpu); @@ -358,7 +367,6 @@ static unsigned long kvm_sdei_hypercall_complete(struct kvm_vcpu *vcpu, * event state as it's not destroyed because of the reference * count. */ - kske = ksve->kske; ksve->state.refcount--; kske->state.refcount--; if (!ksve->state.refcount) { @@ -746,6 +754,35 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) return 1; } +int kvm_sdei_register_notifier(struct kvm *kvm, + unsigned long num, + kvm_sdei_notifier notifier) +{ + struct kvm_sdei_kvm *ksdei = kvm->arch.sdei; + struct kvm_sdei_event *kse = NULL; + int ret = 0; + + if (!ksdei) { + ret = -EPERM; + goto out; + } + + spin_lock(&ksdei->lock); + + kse = kvm_sdei_find_event(kvm, num); + if (!kse) { + ret = -EINVAL; + goto unlock; + } + + kse->state.notifier = (unsigned long)notifier; + +unlock: + spin_unlock(&ksdei->lock); +out: + return ret; +} + void kvm_sdei_deliver(struct kvm_vcpu *vcpu) { struct kvm *kvm = vcpu->kvm; @@ -755,6 +792,7 @@ void kvm_sdei_deliver(struct kvm_vcpu *vcpu) struct kvm_sdei_kvm_event *kske = NULL; struct kvm_sdei_vcpu_event *ksve = NULL; struct kvm_sdei_vcpu_regs *regs = NULL; + kvm_sdei_notifier notifier; unsigned long pstate; int index = 0; @@ -826,6 +864,11 @@ void kvm_sdei_deliver(struct kvm_vcpu *vcpu) *vcpu_cpsr(vcpu) = pstate; *vcpu_pc(vcpu) = kske->state.entries[index]; + /* Notifier */ + notifier = (kvm_sdei_notifier)(kse->state.notifier); + if (notifier) + notifier(vcpu, kse->state.num, KVM_SDEI_NOTIFY_DELIVERED); + unlock: spin_unlock(&vsdei->lock); } -- 2.23.0