From patchwork Wed Aug 30 16:14:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 1827855 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=amazon.com header.i=@amazon.com header.a=rsa-sha256 header.s=amazon201209 header.b=FcTOKX84; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RbTvw14dCz1yfX for ; Thu, 31 Aug 2023 02:17:16 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qbNrF-0003lS-OD; Wed, 30 Aug 2023 12:15:54 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qbNqc-0003GS-M6; Wed, 30 Aug 2023 12:15:16 -0400 Received: from smtp-fw-52004.amazon.com ([52.119.213.154]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qbNqY-0003rC-Ge; Wed, 30 Aug 2023 12:15:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1693412111; x=1724948111; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HjBlQeN1Y1+S0cLeAYRYcUWhTSG9q28X6IWlXsIuh7k=; b=FcTOKX84SCbTao4YNO6pSyF8Goo/ZQn+dgxjoLtPgO4ZfDKtuevrAihE 8C+PYQH+sUP83LkL4IJzvHlmS84bfxoVFGFQ9/UlgZWWttAHa+N19Umau TiFguIV1GzwXNqdCInDUhv2stF0F738xEAs+S6qb7F5p+wzUrXTM+cE0H k=; X-IronPort-AV: E=Sophos;i="6.02,214,1688428800"; d="scan'208";a="151694715" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-pdx-2c-m6i4x-5eae960a.us-west-2.amazon.com) ([10.43.8.2]) by smtp-border-fw-52004.iad7.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Aug 2023 16:15:05 +0000 Received: from EX19MTAUWB002.ant.amazon.com (pdx1-ws-svc-p6-lb9-vlan3.pdx.amazon.com [10.236.137.198]) by email-inbound-relay-pdx-2c-m6i4x-5eae960a.us-west-2.amazon.com (Postfix) with ESMTPS id 2C6FB40DCB; Wed, 30 Aug 2023 16:15:03 +0000 (UTC) Received: from EX19D020UWC004.ant.amazon.com (10.13.138.149) by EX19MTAUWB002.ant.amazon.com (10.250.64.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.37; Wed, 30 Aug 2023 16:15:02 +0000 Received: from dev-dsk-graf-1a-5ce218e4.eu-west-1.amazon.com (10.253.83.51) by EX19D020UWC004.ant.amazon.com (10.13.138.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.37; Wed, 30 Aug 2023 16:15:00 +0000 From: Alexander Graf To: CC: , , Cameron Esfahani , Stefan Hajnoczi , "Michael S . Tsirkin" , Kevin Wolf , Hanna Reitz , Marcel Apfelbaum , "Paolo Bonzini" , Peter Maydell , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , Mads Ynddal , =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , Bernhard Beschow , Gerd Hoffmann Subject: [PATCH v2 11/12] hw/vmapple/virtio-blk: Add support for apple virtio-blk Date: Wed, 30 Aug 2023 16:14:24 +0000 Message-ID: <20230830161425.91946-12-graf@amazon.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230830161425.91946-1-graf@amazon.com> References: <20230830161425.91946-1-graf@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.253.83.51] X-ClientProxiedBy: EX19D040UWA002.ant.amazon.com (10.13.139.113) To EX19D020UWC004.ant.amazon.com (10.13.138.149) Precedence: Bulk Received-SPF: pass client-ip=52.119.213.154; envelope-from=prvs=599fd62c5=graf@amazon.de; helo=smtp-fw-52004.amazon.com X-Spam_score_int: -39 X-Spam_score: -4.0 X-Spam_bar: ---- X-Spam_report: (-4.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Apple has its own virtio-blk PCI device ID where it deviates from the official virtio-pci spec slightly: It puts a new "apple type" field at a static offset in config space and introduces a new barrier command. This patch first creates a mechanism for virtio-blk downstream classes to handle unknown commands. It then creates such a downstream class and a new vmapple-virtio-blk-pci class which support the additional apple type config identifier as well as the barrier command. It then exposes 2 subclasses from that that we can use to expose root and aux virtio-blk devices: "vmapple-virtio-root" and "vmapple-virtio-aux". Signed-off-by: Alexander Graf Reviewed-by: Stefan Hajnoczi --- v1 -> v2: - Rework to make all vmapple virtio-blk logic a subclass --- include/hw/pci/pci_ids.h | 1 + include/hw/virtio/virtio-blk.h | 12 +- include/hw/vmapple/virtio-blk.h | 39 ++++++ hw/block/virtio-blk.c | 19 ++- hw/vmapple/virtio-blk.c | 212 ++++++++++++++++++++++++++++++++ hw/vmapple/Kconfig | 3 + hw/vmapple/meson.build | 1 + 7 files changed, 282 insertions(+), 5 deletions(-) create mode 100644 include/hw/vmapple/virtio-blk.h create mode 100644 hw/vmapple/virtio-blk.c diff --git a/include/hw/pci/pci_ids.h b/include/hw/pci/pci_ids.h index e4386ebb20..74e589a298 100644 --- a/include/hw/pci/pci_ids.h +++ b/include/hw/pci/pci_ids.h @@ -188,6 +188,7 @@ #define PCI_DEVICE_ID_APPLE_UNI_N_AGP 0x0020 #define PCI_DEVICE_ID_APPLE_U3_AGP 0x004b #define PCI_DEVICE_ID_APPLE_UNI_N_GMAC 0x0021 +#define PCI_DEVICE_ID_APPLE_VIRTIO_BLK 0x1a00 #define PCI_VENDOR_ID_SUN 0x108e #define PCI_DEVICE_ID_SUN_EBUS 0x1000 diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h index dafec432ce..381a906410 100644 --- a/include/hw/virtio/virtio-blk.h +++ b/include/hw/virtio/virtio-blk.h @@ -23,7 +23,7 @@ #include "qom/object.h" #define TYPE_VIRTIO_BLK "virtio-blk-device" -OBJECT_DECLARE_SIMPLE_TYPE(VirtIOBlock, VIRTIO_BLK) +OBJECT_DECLARE_TYPE(VirtIOBlock, VirtIOBlkClass, VIRTIO_BLK) /* This is the last element of the write scatter-gather list */ struct virtio_blk_inhdr @@ -91,6 +91,16 @@ typedef struct MultiReqBuffer { bool is_write; } MultiReqBuffer; +typedef struct VirtIOBlkClass { + /*< private >*/ + VirtioDeviceClass parent; + /*< public >*/ + bool (*handle_unknown_request)(VirtIOBlockReq *req, MultiReqBuffer *mrb, + uint32_t type); +} VirtIOBlkClass; + void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq); +void virtio_blk_free_request(VirtIOBlockReq *req); +void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status); #endif diff --git a/include/hw/vmapple/virtio-blk.h b/include/hw/vmapple/virtio-blk.h new file mode 100644 index 0000000000..b23106a3df --- /dev/null +++ b/include/hw/vmapple/virtio-blk.h @@ -0,0 +1,39 @@ +/* + * VMApple specific VirtIO Block implementation + * + * Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#ifndef HW_VMAPPLE_CFG_H +#define HW_VMAPPLE_CFG_H + +#include "hw/sysbus.h" +#include "qom/object.h" +#include "hw/virtio/virtio-pci.h" +#include "hw/virtio/virtio-blk.h" + +#define TYPE_VMAPPLE_VIRTIO_BLK "vmapple-virtio-blk" +#define TYPE_VMAPPLE_VIRTIO_ROOT "vmapple-virtio-root" +#define TYPE_VMAPPLE_VIRTIO_AUX "vmapple-virtio-aux" + +OBJECT_DECLARE_TYPE(VMAppleVirtIOBlk, VMAppleVirtIOBlkClass, VMAPPLE_VIRTIO_BLK) + +typedef struct VMAppleVirtIOBlkClass { + /*< private >*/ + VirtIOBlkClass parent; + /*< public >*/ + void (*get_config)(VirtIODevice *vdev, uint8_t *config); +} VMAppleVirtIOBlkClass; + +typedef struct VMAppleVirtIOBlk { + /* */ + VirtIOBlock parent_obj; + + /* */ + uint32_t apple_type; +} VMAppleVirtIOBlk; + +#endif /* HW_VMAPPLE_CFG_H */ diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 39e7f23fab..1645cdccbe 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -48,12 +48,12 @@ static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq, req->mr_next = NULL; } -static void virtio_blk_free_request(VirtIOBlockReq *req) +void virtio_blk_free_request(VirtIOBlockReq *req) { g_free(req); } -static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) +void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) { VirtIOBlock *s = req->dev; VirtIODevice *vdev = VIRTIO_DEVICE(s); @@ -1121,8 +1121,18 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) break; } default: - virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); - virtio_blk_free_request(req); + { + /* + * Give subclasses a chance to handle unknown requests. This way the + * class lookup is not in the hot path. + */ + VirtIOBlkClass *vbk = VIRTIO_BLK_GET_CLASS(s); + if (!vbk->handle_unknown_request || + !vbk->handle_unknown_request(req, mrb, type)) { + virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); + virtio_blk_free_request(req); + } + } } return 0; } @@ -1764,6 +1774,7 @@ static const TypeInfo virtio_blk_info = { .instance_size = sizeof(VirtIOBlock), .instance_init = virtio_blk_instance_init, .class_init = virtio_blk_class_init, + .class_size = sizeof(VirtIOBlkClass), }; static void virtio_register_types(void) diff --git a/hw/vmapple/virtio-blk.c b/hw/vmapple/virtio-blk.c new file mode 100644 index 0000000000..720eaa61a8 --- /dev/null +++ b/hw/vmapple/virtio-blk.c @@ -0,0 +1,212 @@ +/* + * VMApple specific VirtIO Block implementation + * + * Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + * VMApple uses almost standard VirtIO Block, but with a few key differences: + * + * - Different PCI device/vendor ID + * - An additional "type" identifier to differentiate AUX and Root volumes + * - An additional BARRIER command + */ + +#include "qemu/osdep.h" +#include "hw/vmapple/virtio-blk.h" +#include "qemu/log.h" +#include "qemu/module.h" +#include "qapi/error.h" + +#define VIRTIO_BLK_T_APPLE_BARRIER 0x10000 + +#define VIRTIO_APPLE_TYPE_ROOT 1 +#define VIRTIO_APPLE_TYPE_AUX 2 + +static bool vmapple_virtio_blk_handle_unknown_request(VirtIOBlockReq *req, + MultiReqBuffer *mrb, + uint32_t type) +{ + switch (type) { + case VIRTIO_BLK_T_APPLE_BARRIER: + /* We ignore barriers for now. YOLO. */ + virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); + virtio_blk_free_request(req); + return true; + default: + return false; + } +} + +/* + * VMApple virtio-blk uses the same config format as normal virtio, with one + * exception: It adds an "apple type" specififer at the same location that + * the spec reserves for max_secure_erase_sectors. Let's hook into the + * get_config code path here, run it as usual and then patch in the apple type. + */ +static void vmapple_virtio_blk_get_config(VirtIODevice *vdev, uint8_t *config) +{ + VMAppleVirtIOBlk *dev = VMAPPLE_VIRTIO_BLK(vdev); + VMAppleVirtIOBlkClass *vvbk = VMAPPLE_VIRTIO_BLK_GET_CLASS(dev); + struct virtio_blk_config *blkcfg = (struct virtio_blk_config *)config; + + vvbk->get_config(vdev, config); + + g_assert(dev->parent_obj.config_size >= endof(struct virtio_blk_config, zoned)); + + /* Apple abuses the field for max_secure_erase_sectors as type id */ + blkcfg->max_secure_erase_sectors = dev->apple_type; +} + +static Property vmapple_virtio_blk_properties[] = { + DEFINE_PROP_UINT32("apple-type", VMAppleVirtIOBlk, apple_type, 0), + DEFINE_PROP_END_OF_LIST(), +}; + +static void vmapple_virtio_blk_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + VirtIOBlkClass *vbk = VIRTIO_BLK_CLASS(klass); + VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); + VMAppleVirtIOBlkClass *vvbk = VMAPPLE_VIRTIO_BLK_CLASS(klass); + + vbk->handle_unknown_request = vmapple_virtio_blk_handle_unknown_request; + vvbk->get_config = vdc->get_config; + vdc->get_config = vmapple_virtio_blk_get_config; + device_class_set_props(dc, vmapple_virtio_blk_properties); +} + +static const TypeInfo vmapple_virtio_blk_info = { + .name = TYPE_VMAPPLE_VIRTIO_BLK, + .parent = TYPE_VIRTIO_BLK, + .instance_size = sizeof(VMAppleVirtIOBlk), + .class_init = vmapple_virtio_blk_class_init, +}; + +/* PCI Devices */ + +typedef struct VMAppleVirtIOBlkPCI { + VirtIOPCIProxy parent_obj; + VMAppleVirtIOBlk vdev; + uint32_t apple_type; +} VMAppleVirtIOBlkPCI; + +/* + * vmapple-virtio-blk-pci: This extends VirtioPCIProxy. + */ +#define TYPE_VMAPPLE_VIRTIO_BLK_PCI "vmapple-virtio-blk-pci-base" +DECLARE_INSTANCE_CHECKER(VMAppleVirtIOBlkPCI, VMAPPLE_VIRTIO_BLK_PCI, + TYPE_VMAPPLE_VIRTIO_BLK_PCI) + +static Property vmapple_virtio_blk_pci_properties[] = { + DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0), + DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, + VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), + DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, + DEV_NVECTORS_UNSPECIFIED), + DEFINE_PROP_END_OF_LIST(), +}; + +static void vmapple_virtio_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp) +{ + VMAppleVirtIOBlkPCI *dev = VMAPPLE_VIRTIO_BLK_PCI(vpci_dev); + DeviceState *vdev = DEVICE(&dev->vdev); + VirtIOBlkConf *conf = &dev->vdev.parent_obj.conf; + + if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) { + conf->num_queues = virtio_pci_optimal_num_queues(0); + } + + if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) { + vpci_dev->nvectors = conf->num_queues + 1; + } + + /* + * We don't support zones, but we need the additional config space size. + * Let's just expose the feature so the rest of the virtio-blk logic + * allocates enough space for us. The guest will ignore zones anyway. + */ + virtio_add_feature(&dev->vdev.parent_obj.host_features, VIRTIO_BLK_F_ZONED); + /* Propagate the apple type down to the virtio-blk device */ + qdev_prop_set_uint32(DEVICE(&dev->vdev), "apple-type", dev->apple_type); + /* and spawn the virtio-blk device */ + qdev_realize(vdev, BUS(&vpci_dev->bus), errp); + + /* + * The virtio-pci machinery adjusts its vendor/device ID based on whether + * we support modern or legacy virtio. Let's patch it back to the Apple + * identifiers here. + */ + pci_config_set_vendor_id(vpci_dev->pci_dev.config, PCI_VENDOR_ID_APPLE); + pci_config_set_device_id(vpci_dev->pci_dev.config, PCI_DEVICE_ID_APPLE_VIRTIO_BLK); +} + +static void vmapple_virtio_blk_pci_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass); + PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass); + + set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); + device_class_set_props(dc, vmapple_virtio_blk_pci_properties); + k->realize = vmapple_virtio_blk_pci_realize; + pcidev_k->vendor_id = PCI_VENDOR_ID_APPLE; + pcidev_k->device_id = PCI_DEVICE_ID_APPLE_VIRTIO_BLK; + pcidev_k->revision = VIRTIO_PCI_ABI_VERSION; + pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI; +} + +static void vmapple_virtio_blk_pci_instance_init(Object *obj) +{ + VMAppleVirtIOBlkPCI *dev = VMAPPLE_VIRTIO_BLK_PCI(obj); + + virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev), + TYPE_VMAPPLE_VIRTIO_BLK); +} + +static const VirtioPCIDeviceTypeInfo vmapple_virtio_blk_pci_info = { + .base_name = TYPE_VMAPPLE_VIRTIO_BLK_PCI, + .generic_name = "vmapple-virtio-blk-pci", + .instance_size = sizeof(VMAppleVirtIOBlkPCI), + .instance_init = vmapple_virtio_blk_pci_instance_init, + .class_init = vmapple_virtio_blk_pci_class_init, +}; + +static void vmapple_virtio_root_instance_init(Object *obj) +{ + VMAppleVirtIOBlkPCI *dev = VMAPPLE_VIRTIO_BLK_PCI(obj); + + dev->apple_type = VIRTIO_APPLE_TYPE_ROOT; +} + +static const TypeInfo vmapple_virtio_root_info = { + .name = TYPE_VMAPPLE_VIRTIO_ROOT, + .parent = "vmapple-virtio-blk-pci", + .instance_size = sizeof(VMAppleVirtIOBlkPCI), + .instance_init = vmapple_virtio_root_instance_init, +}; + +static void vmapple_virtio_aux_instance_init(Object *obj) +{ + VMAppleVirtIOBlkPCI *dev = VMAPPLE_VIRTIO_BLK_PCI(obj); + + dev->apple_type = VIRTIO_APPLE_TYPE_AUX; +} + +static const TypeInfo vmapple_virtio_aux_info = { + .name = TYPE_VMAPPLE_VIRTIO_AUX, + .parent = "vmapple-virtio-blk-pci", + .instance_size = sizeof(VMAppleVirtIOBlkPCI), + .instance_init = vmapple_virtio_aux_instance_init, +}; + +static void vmapple_virtio_blk_register_types(void) +{ + type_register_static(&vmapple_virtio_blk_info); + virtio_pci_types_register(&vmapple_virtio_blk_pci_info); + type_register_static(&vmapple_virtio_root_info); + type_register_static(&vmapple_virtio_aux_info); +} + +type_init(vmapple_virtio_blk_register_types) diff --git a/hw/vmapple/Kconfig b/hw/vmapple/Kconfig index ba37fc5b81..f06eae8039 100644 --- a/hw/vmapple/Kconfig +++ b/hw/vmapple/Kconfig @@ -9,3 +9,6 @@ config VMAPPLE_CFG config VMAPPLE_PVG bool + +config VMAPPLE_VIRTIO_BLK + bool diff --git a/hw/vmapple/meson.build b/hw/vmapple/meson.build index 74a0d7a5f1..3b4a16f619 100644 --- a/hw/vmapple/meson.build +++ b/hw/vmapple/meson.build @@ -2,3 +2,4 @@ system_ss.add(when: 'CONFIG_VMAPPLE_AES', if_true: files('aes.c')) system_ss.add(when: 'CONFIG_VMAPPLE_BDIF', if_true: files('bdif.c')) system_ss.add(when: 'CONFIG_VMAPPLE_CFG', if_true: files('cfg.c')) system_ss.add(when: 'CONFIG_VMAPPLE_PVG', if_true: [files('apple-gfx.m'), pvg, metal]) +system_ss.add(when: 'CONFIG_VMAPPLE_VIRTIO_BLK', if_true: files('virtio-blk.c'))