From patchwork Tue Jan 9 19:38:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 13515300 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83077C4707B for ; Tue, 9 Jan 2024 19:40:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A4A1A8D0018; Tue, 9 Jan 2024 14:38:23 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9AA7D8D0017; Tue, 9 Jan 2024 14:38:23 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7D8318D0018; Tue, 9 Jan 2024 14:38:23 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 6A0328D0017 for ; Tue, 9 Jan 2024 14:38:23 -0500 (EST) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 4C95D1C1341 for ; Tue, 9 Jan 2024 19:38:23 +0000 (UTC) X-FDA: 81660784086.09.48790AC Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by imf10.hostedemail.com (Postfix) with ESMTP id 1A932C0022 for ; Tue, 9 Jan 2024 19:38:20 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=quicinc.com header.s=qcppdkim1 header.b=DRkqiuCE; dmarc=pass (policy=none) header.from=quicinc.com; spf=pass (imf10.hostedemail.com: domain of quic_eberman@quicinc.com designates 205.220.168.131 as permitted sender) smtp.mailfrom=quic_eberman@quicinc.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1704829101; h=from:from:sender: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:dkim-signature; bh=4oPsPgVxByAWZqC4ZIbBPds+aMeiFl+WBc0pqTixgwc=; b=fOu1Ykusinn9TZJLvBuZf1iXMq3+Ad4Ry9EAdifUNk+tQZtbqAuVAt1xC0L51pZpnteq/i fCSGANKRz9ljlpfoqcQShkcLULlpCzbdW/kVdICBAJuhduXR/LZ1u7m2WsEPE5bdZZ2SGr FQQR8TP3c3pa70DdRN8F3hl0UwYN6GE= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=quicinc.com header.s=qcppdkim1 header.b=DRkqiuCE; dmarc=pass (policy=none) header.from=quicinc.com; spf=pass (imf10.hostedemail.com: domain of quic_eberman@quicinc.com designates 205.220.168.131 as permitted sender) smtp.mailfrom=quic_eberman@quicinc.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1704829101; a=rsa-sha256; cv=none; b=r/cTNCc768fNTcPrlYLY/J/IzaMh4LuH+dv99CQw1Gi4sAlFP5Ej83AMZ6YoWiA/a4qRN4 rZojWbKMf4gByKg8Ls1DCbPI98IO90vcCFldoFRaQMHd/lIxSZUeYCZdnRMS0rOH9EcpU7 Ydo6c4HJmQh4JoNxUQifxftLBG5jldg= Received: from pps.filterd (m0279867.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 409EvQDL028241; Tue, 9 Jan 2024 19:38:11 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= from:date:subject:mime-version:content-type :content-transfer-encoding:message-id:references:in-reply-to:to :cc; s=qcppdkim1; bh=4oPsPgVxByAWZqC4ZIbBPds+aMeiFl+WBc0pqTixgwc =; b=DRkqiuCEC/BZFuilTQeWSrLWAoET1QgjYlsAvw0Atuac4tyPpIf2LoPUwPt SEDoBIYEgH9R8Rn1uLAbXVoH2yT6kwHPWju99KYkefqLh8fQ6IQx0EUJUL+RcM0n Xmvz1KTmp/AtAiFT72rRAsau/FEuiW1+/HCNf6dIT91ENvNxr/lwRQ7p8LsxxDny kyHm2vtqOvr15cSvr6bcUg+i5jt3azMzfrlA5YBIVxhzniHezzfihqXlrYmm5bAh CjPmXpRJFDHMZE+7TB27xdeJOM1xy8AH2h1o6KYhhKYTlmkRLAtShSn18n40y13y rExu0eiGOf5b/uHi0FBdDMURD7g== Received: from nasanppmta04.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3vgxxbhtep-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 09 Jan 2024 19:38:11 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 409JcAv7030651 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 9 Jan 2024 19:38:10 GMT Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Tue, 9 Jan 2024 11:38:09 -0800 From: Elliot Berman Date: Tue, 9 Jan 2024 11:38:10 -0800 Subject: [PATCH v16 32/34] virt: gunyah: Add IO handlers MIME-Version: 1.0 Message-ID: <20240109-gunyah-v16-32-634904bf4ce9@quicinc.com> References: <20240109-gunyah-v16-0-634904bf4ce9@quicinc.com> In-Reply-To: <20240109-gunyah-v16-0-634904bf4ce9@quicinc.com> To: Alex Elder , Srinivas Kandagatla , Murali Nalajal , Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Philip Derrin , Prakruthi Deepak Heragu , Jonathan Corbet , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Konrad Dybcio , Bjorn Andersson , Dmitry Baryshkov , "Fuad Tabba" , Sean Christopherson , "Andrew Morton" CC: , , , , , , Elliot Berman X-Mailer: b4 0.13-dev X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: xzdk2e9nhIM0BExctrrsg61U1fFmrGqg X-Proofpoint-GUID: xzdk2e9nhIM0BExctrrsg61U1fFmrGqg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-09_02,2023-12-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=863 lowpriorityscore=0 priorityscore=1501 bulkscore=0 phishscore=0 spamscore=0 clxscore=1015 mlxscore=0 adultscore=0 impostorscore=0 malwarescore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2311290000 definitions=main-2401090158 X-Rspamd-Queue-Id: 1A932C0022 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: 1rc8z5sptc61wbigbjp4ajeagzt6wmgs X-HE-Tag: 1704829100-253149 X-HE-Meta: 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 kgkjcTVC ZVo9wmZH05H27bNpp97NNiE/SvErx/1GFHWuZVStCmpa/8on6OnvTXYCHffI5aHjZq6XKDWPK00Jc7sVq5njCf53ERJTfZ6u5zfT1LC6/FIJSo+9ukcmvF4Y4+mVCmUrZVV9Z3BplP6ZwiJ4S2hct/pMG0++U/BVtCcMkodmROgKCcixxHPKPB1U9FSfDkTGCtUsInSIreQ3A6rP1rxScM6EekFy/anaZv/2jt+lHlb2mu0kBQq5GgSS12Is8AQifSOaR36VVIXVjEmb9+GHqeilfc065yc6G1pAjixXJRYbu0Mv+/ofrKL9IiM4vMSZ1kw8LH1lWFzmKqV4zB++4gsi2Gex/v0tUP4BJQ7UDzP9WJbgJFq4hJFy6Lpe1f7XBVftTNpMRs6LiAEncZXfeGz0qSYliSYUViUfurHDefaIEkTczOeH9x+Y2kA== 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: List-Subscribe: List-Unsubscribe: Add framework for VM functions to handle stage-2 write faults from Gunyah guest virtual machines. IO handlers have a range of addresses which they apply to. Optionally, they may apply to only when the value written matches the IO handler's value. Reviewed-by: Alex Elder Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman --- drivers/virt/gunyah/gunyah_vcpu.c | 4 ++ drivers/virt/gunyah/vm_mgr.c | 115 ++++++++++++++++++++++++++++++++++++++ drivers/virt/gunyah/vm_mgr.h | 8 +++ include/linux/gunyah.h | 29 ++++++++++ 4 files changed, 156 insertions(+) diff --git a/drivers/virt/gunyah/gunyah_vcpu.c b/drivers/virt/gunyah/gunyah_vcpu.c index f01e6d6163ba..edadb056cc18 100644 --- a/drivers/virt/gunyah/gunyah_vcpu.c +++ b/drivers/virt/gunyah/gunyah_vcpu.c @@ -133,6 +133,10 @@ gunyah_handle_mmio(struct gunyah_vcpu *vcpu, unsigned long resume_data[3], vcpu->state = GUNYAH_VCPU_RUN_STATE_MMIO_READ; vcpu->mmio_read_len = len; } else { /* GUNYAH_VCPU_ADDRSPACE_VMMIO_WRITE */ + if (!gunyah_vm_mmio_write(vcpu->ghvm, addr, len, data)) { + resume_data[0] = GUNYAH_ADDRSPACE_VMMIO_ACTION_EMULATE; + return true; + } vcpu->vcpu_run->mmio.is_write = 1; memcpy(vcpu->vcpu_run->mmio.data, &data, len); vcpu->state = GUNYAH_VCPU_RUN_STATE_MMIO_WRITE; diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c index 1f3d29749174..cb63cb121846 100644 --- a/drivers/virt/gunyah/vm_mgr.c +++ b/drivers/virt/gunyah/vm_mgr.c @@ -295,6 +295,118 @@ static void gunyah_vm_clean_resources(struct gunyah_vm *ghvm) mutex_unlock(&ghvm->resources_lock); } +static int _gunyah_vm_io_handler_compare(const struct rb_node *node, + const struct rb_node *parent) +{ + struct gunyah_vm_io_handler *n = + container_of(node, struct gunyah_vm_io_handler, node); + struct gunyah_vm_io_handler *p = + container_of(parent, struct gunyah_vm_io_handler, node); + + if (n->addr < p->addr) + return -1; + if (n->addr > p->addr) + return 1; + if ((n->len && !p->len) || (!n->len && p->len)) + return 0; + if (n->len < p->len) + return -1; + if (n->len > p->len) + return 1; + /* one of the io handlers doesn't have datamatch and the other does. + * For purposes of comparison, that makes them identical since the + * one that doesn't have datamatch will cover the same handler that + * does. + */ + if (n->datamatch != p->datamatch) + return 0; + if (n->data < p->data) + return -1; + if (n->data > p->data) + return 1; + return 0; +} + +static int gunyah_vm_io_handler_compare(struct rb_node *node, + const struct rb_node *parent) +{ + return _gunyah_vm_io_handler_compare(node, parent); +} + +static int gunyah_vm_io_handler_find(const void *key, + const struct rb_node *node) +{ + const struct gunyah_vm_io_handler *k = key; + + return _gunyah_vm_io_handler_compare(&k->node, node); +} + +static struct gunyah_vm_io_handler * +gunyah_vm_mgr_find_io_hdlr(struct gunyah_vm *ghvm, u64 addr, u64 len, u64 data) +{ + struct gunyah_vm_io_handler key = { + .addr = addr, + .len = len, + .datamatch = true, + .data = data, + }; + struct rb_node *node; + + node = rb_find(&key, &ghvm->mmio_handler_root, + gunyah_vm_io_handler_find); + if (!node) + return NULL; + + return container_of(node, struct gunyah_vm_io_handler, node); +} + +int gunyah_vm_mmio_write(struct gunyah_vm *ghvm, u64 addr, u32 len, u64 data) +{ + struct gunyah_vm_io_handler *io_hdlr = NULL; + int ret; + + down_read(&ghvm->mmio_handler_lock); + io_hdlr = gunyah_vm_mgr_find_io_hdlr(ghvm, addr, len, data); + if (!io_hdlr || !io_hdlr->ops || !io_hdlr->ops->write) { + ret = -ENOENT; + goto out; + } + + ret = io_hdlr->ops->write(io_hdlr, addr, len, data); + +out: + up_read(&ghvm->mmio_handler_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gunyah_vm_mmio_write); + +int gunyah_vm_add_io_handler(struct gunyah_vm *ghvm, + struct gunyah_vm_io_handler *io_hdlr) +{ + struct rb_node *found; + + if (io_hdlr->datamatch && + (!io_hdlr->len || io_hdlr->len > sizeof(io_hdlr->data))) + return -EINVAL; + + down_write(&ghvm->mmio_handler_lock); + found = rb_find_add(&io_hdlr->node, &ghvm->mmio_handler_root, + gunyah_vm_io_handler_compare); + up_write(&ghvm->mmio_handler_lock); + + return found ? -EEXIST : 0; +} +EXPORT_SYMBOL_GPL(gunyah_vm_add_io_handler); + +void gunyah_vm_remove_io_handler(struct gunyah_vm *ghvm, + struct gunyah_vm_io_handler *io_hdlr) +{ + down_write(&ghvm->mmio_handler_lock); + rb_erase(&io_hdlr->node, &ghvm->mmio_handler_root); + up_write(&ghvm->mmio_handler_lock); +} +EXPORT_SYMBOL_GPL(gunyah_vm_remove_io_handler); + static int gunyah_vm_rm_notification_status(struct gunyah_vm *ghvm, void *data) { struct gunyah_rm_vm_status_payload *payload = data; @@ -397,6 +509,9 @@ static __must_check struct gunyah_vm *gunyah_vm_alloc(struct gunyah_rm *rm) INIT_LIST_HEAD(&ghvm->resource_tickets); xa_init(&ghvm->boot_context); + init_rwsem(&ghvm->mmio_handler_lock); + ghvm->mmio_handler_root = RB_ROOT; + mt_init(&ghvm->mm); mt_init(&ghvm->bindings); init_rwsem(&ghvm->bindings_lock); diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index 4a436c3e435c..b956989fa5e6 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -10,6 +10,7 @@ #include #include #include +#include #include #include @@ -56,6 +57,9 @@ long gunyah_dev_vm_mgr_ioctl(struct gunyah_rm *rm, unsigned int cmd, * @guest_shared_extent_ticket: Resource ticket to the capability for * the memory extent that represents * memory shared with the guest. + * @mmio_handler_root: RB tree of MMIO handlers. + * Entries are &struct gunyah_vm_io_handler + * @mmio_handler_lock: Serialization of traversing @mmio_handler_root * @rm: Pointer to the resource manager struct to make RM calls * @parent: For logging * @nb: Notifier block for RM notifications @@ -91,6 +95,8 @@ struct gunyah_vm { struct gunyah_vm_resource_ticket addrspace_ticket, host_private_extent_ticket, host_shared_extent_ticket, guest_private_extent_ticket, guest_shared_extent_ticket; + struct rb_root mmio_handler_root; + struct rw_semaphore mmio_handler_lock; struct gunyah_rm *rm; @@ -117,6 +123,8 @@ struct gunyah_vm { struct xarray boot_context; }; +int gunyah_vm_mmio_write(struct gunyah_vm *ghvm, u64 addr, u32 len, u64 data); + int gunyah_vm_parcel_to_paged(struct gunyah_vm *ghvm, struct gunyah_rm_mem_parcel *parcel, u64 gfn, u64 nr); diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index 67cb9350ab9e..4638c358869a 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -156,6 +156,35 @@ int gunyah_vm_add_resource_ticket(struct gunyah_vm *ghvm, void gunyah_vm_remove_resource_ticket(struct gunyah_vm *ghvm, struct gunyah_vm_resource_ticket *ticket); +/* + * gunyah_vm_io_handler contains the info about an io device and its associated + * addr and the ops associated with the io device. + */ +struct gunyah_vm_io_handler { + struct rb_node node; + u64 addr; + + bool datamatch; + u8 len; + u64 data; + struct gunyah_vm_io_handler_ops *ops; +}; + +/* + * gunyah_vm_io_handler_ops contains function pointers associated with an iodevice. + */ +struct gunyah_vm_io_handler_ops { + int (*read)(struct gunyah_vm_io_handler *io_dev, u64 addr, u32 len, + u64 data); + int (*write)(struct gunyah_vm_io_handler *io_dev, u64 addr, u32 len, + u64 data); +}; + +int gunyah_vm_add_io_handler(struct gunyah_vm *ghvm, + struct gunyah_vm_io_handler *io_dev); +void gunyah_vm_remove_io_handler(struct gunyah_vm *ghvm, + struct gunyah_vm_io_handler *io_dev); + #define GUNYAH_RM_ACL_X BIT(0) #define GUNYAH_RM_ACL_W BIT(1) #define GUNYAH_RM_ACL_R BIT(2)