From patchwork Mon Dec 17 13:29:56 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 10733495 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id ADA3D13AD for ; Mon, 17 Dec 2018 13:39:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9E2BE29CF2 for ; Mon, 17 Dec 2018 13:39:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9164629D17; Mon, 17 Dec 2018 13:39:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 7BBFA29CF2 for ; Mon, 17 Dec 2018 13:39:39 +0000 (UTC) Received: from localhost ([::1]:46880 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gYt7S-0002Wi-1o for patchwork-qemu-devel@patchwork.kernel.org; Mon, 17 Dec 2018 08:39:38 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55971) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gYsyl-0003Pz-7M for qemu-devel@nongnu.org; Mon, 17 Dec 2018 08:30:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gYsyi-0005rq-KL for qemu-devel@nongnu.org; Mon, 17 Dec 2018 08:30:39 -0500 Received: from smtp03.citrix.com ([162.221.156.55]:50437) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gYsyX-0005YR-D0; Mon, 17 Dec 2018 08:30:26 -0500 X-IronPort-AV: E=Sophos;i="5.56,365,1539648000"; d="scan'208";a="73540244" From: Paul Durrant To: , , Date: Mon, 17 Dec 2018 13:29:56 +0000 Message-ID: <20181217133011.31433-4-paul.durrant@citrix.com> X-Mailer: git-send-email 2.20.1.2.gb21ebb6 In-Reply-To: <20181217133011.31433-1-paul.durrant@citrix.com> References: <20181217133011.31433-1-paul.durrant@citrix.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 162.221.156.55 Subject: [Qemu-devel] [PATCH v6 03/18] xen: introduce 'xen-block', 'xen-disk' and 'xen-cdrom' X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anthony Perard , Kevin Wolf , Paul Durrant , Stefano Stabellini , Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This patch adds new XenDevice-s: 'xen-disk' and 'xen-cdrom', both derived from a common 'xen-block' parent type. These will eventually replace the 'xen_disk' (note the underscore rather than hyphen) legacy PV backend but it is illustrative to build up the implementation incrementally, along with the XenBus/XenDevice framework. Subsequent patches will therefore add to these devices' implementation as new features are added to the framework. After this patch has been applied it is possible to instantiate new 'xen-disk' or 'xen-cdrom' devices with a single 'vdev' parameter, which accepts values adhering to the Xen VBD naming scheme [1]. For example, a command-line instantiation of a xen-disk can be done with an argument similar to the following: -device xen-disk,vdev=hda The implementation of the vdev parameter formulates the appropriate VBD number for use in the PV protocol. [1] https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html Signed-off-by: Paul Durrant Reviewed-by: Anthony Perard --- Cc: Kevin Wolf Cc: Max Reitz Cc: Stefano Stabellini v5: - Introduce properties sub-structure (which will be useful later) - Keeping Anthony's R-b from v4 since change is trivial v3: - Fix vdev parsing again, and vdev formatting this time - Remove an unnecessary local_err v2: - Fix boilerplate - Fix vdev parsing - Change name from 'xen-qdisk' to 'xen-block', make abstract, and split off 'xen-disk' and 'xen-cdrom' as concrete sub-types --- MAINTAINERS | 2 +- hw/block/Makefile.objs | 1 + hw/block/trace-events | 8 + hw/block/xen-block.c | 343 +++++++++++++++++++++++++++++++++++++ include/hw/xen/xen-block.h | 73 ++++++++ 5 files changed, 426 insertions(+), 1 deletion(-) create mode 100644 hw/block/xen-block.c create mode 100644 include/hw/xen/xen-block.h diff --git a/MAINTAINERS b/MAINTAINERS index 63effdc473..dd728c3228 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -403,7 +403,7 @@ F: hw/9pfs/xen-9p-backend.c F: hw/char/xen_console.c F: hw/display/xenfb.c F: hw/net/xen_nic.c -F: hw/block/xen_* +F: hw/block/xen* F: hw/xen/ F: hw/xenpv/ F: hw/i386/xen/ diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs index 53ce5751ae..f34813a377 100644 --- a/hw/block/Makefile.objs +++ b/hw/block/Makefile.objs @@ -4,6 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o common-obj-$(CONFIG_NAND) += nand.o common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o +common-obj-$(CONFIG_XEN) += xen-block.o common-obj-$(CONFIG_XEN) += xen_disk.o common-obj-$(CONFIG_ECC) += ecc.o common-obj-$(CONFIG_ONENAND) += onenand.o diff --git a/hw/block/trace-events b/hw/block/trace-events index 335c092450..4afbd62a88 100644 --- a/hw/block/trace-events +++ b/hw/block/trace-events @@ -127,3 +127,11 @@ xen_disk_init(char *name) "%s" xen_disk_connect(char *name) "%s" xen_disk_disconnect(char *name) "%s" xen_disk_free(char *name) "%s" + +# hw/block/xen-block.c +xen_block_realize(const char *type, uint32_t disk, uint32_t partition) "%s d%up%u" +xen_block_unrealize(const char *type, uint32_t disk, uint32_t partition) "%s d%up%u" +xen_disk_realize(void) "" +xen_disk_unrealize(void) "" +xen_cdrom_realize(void) "" +xen_cdrom_unrealize(void) "" diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c new file mode 100644 index 0000000000..8e78b6a034 --- /dev/null +++ b/hw/block/xen-block.c @@ -0,0 +1,343 @@ +/* + * Copyright (c) 2018 Citrix Systems Inc. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu/cutils.h" +#include "qapi/error.h" +#include "qapi/visitor.h" +#include "hw/hw.h" +#include "hw/xen/xen-block.h" +#include "trace.h" + +static void xen_block_unrealize(XenDevice *xendev, Error **errp) +{ + XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); + XenBlockDeviceClass *blockdev_class = + XEN_BLOCK_DEVICE_GET_CLASS(xendev); + const char *type = object_get_typename(OBJECT(blockdev)); + XenBlockVdev *vdev = &blockdev->props.vdev; + + if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) { + return; + } + + trace_xen_block_unrealize(type, vdev->disk, vdev->partition); + + if (blockdev_class->unrealize) { + blockdev_class->unrealize(blockdev, errp); + } +} + +static void xen_block_realize(XenDevice *xendev, Error **errp) +{ + XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); + XenBlockDeviceClass *blockdev_class = + XEN_BLOCK_DEVICE_GET_CLASS(xendev); + const char *type = object_get_typename(OBJECT(blockdev)); + XenBlockVdev *vdev = &blockdev->props.vdev; + Error *local_err = NULL; + + if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) { + error_setg(errp, "vdev property not set"); + return; + } + + trace_xen_block_realize(type, vdev->disk, vdev->partition); + + if (blockdev_class->realize) { + blockdev_class->realize(blockdev, &local_err); + if (local_err) { + error_propagate(errp, local_err); + } + } +} + +static char *disk_to_vbd_name(unsigned int disk) +{ + char *name, *prefix = (disk >= 26) ? + disk_to_vbd_name((disk / 26) - 1) : g_strdup(""); + + name = g_strdup_printf("%s%c", prefix, 'a' + disk % 26); + g_free(prefix); + + return name; +} + +static void xen_block_get_vdev(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) +{ + DeviceState *dev = DEVICE(obj); + Property *prop = opaque; + XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop); + char *str; + + switch (vdev->type) { + case XEN_BLOCK_VDEV_TYPE_DP: + str = g_strdup_printf("d%lup%lu", vdev->disk, vdev->partition); + break; + + case XEN_BLOCK_VDEV_TYPE_XVD: + case XEN_BLOCK_VDEV_TYPE_HD: + case XEN_BLOCK_VDEV_TYPE_SD: { + char *name = disk_to_vbd_name(vdev->disk); + + str = g_strdup_printf("%s%s%lu", + (vdev->type == XEN_BLOCK_VDEV_TYPE_XVD) ? + "xvd" : + (vdev->type == XEN_BLOCK_VDEV_TYPE_HD) ? + "hd" : + "sd", + name, vdev->partition); + g_free(name); + break; + } + default: + error_setg(errp, "invalid vdev type"); + return; + } + + visit_type_str(v, name, &str, errp); + g_free(str); +} + +static unsigned int vbd_name_to_disk(const char *name, const char **endp) +{ + unsigned int disk = 0; + + while (*name != '\0') { + if (!g_ascii_isalpha(*name) || !g_ascii_islower(*name)) { + break; + } + + disk *= 26; + disk += *name++ - 'a' + 1; + } + *endp = name; + + return disk - 1; +} + +static void xen_block_set_vdev(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) +{ + DeviceState *dev = DEVICE(obj); + Property *prop = opaque; + XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop); + Error *local_err = NULL; + char *str, *p; + const char *end; + + if (dev->realized) { + qdev_prop_set_after_realize(dev, name, errp); + return; + } + + visit_type_str(v, name, &str, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + p = strchr(str, 'd'); + if (!p) { + goto invalid; + } + + *p++ = '\0'; + if (*str == '\0') { + vdev->type = XEN_BLOCK_VDEV_TYPE_DP; + } else if (strcmp(str, "xv") == 0) { + vdev->type = XEN_BLOCK_VDEV_TYPE_XVD; + } else if (strcmp(str, "h") == 0) { + vdev->type = XEN_BLOCK_VDEV_TYPE_HD; + } else if (strcmp(str, "s") == 0) { + vdev->type = XEN_BLOCK_VDEV_TYPE_SD; + } else { + goto invalid; + } + + if (vdev->type == XEN_BLOCK_VDEV_TYPE_DP) { + if (qemu_strtoul(p, &end, 10, &vdev->disk)) { + goto invalid; + } + + if (*end == 'p') { + p = (char *) ++end; + if (*end == '\0') { + goto invalid; + } + } + } else { + vdev->disk = vbd_name_to_disk(p, &end); + } + + if (*end != '\0') { + p = (char *)end; + + if (qemu_strtoul(p, &end, 10, &vdev->partition)) { + goto invalid; + } + + if (*end != '\0') { + goto invalid; + } + } else { + vdev->partition = 0; + } + + switch (vdev->type) { + case XEN_BLOCK_VDEV_TYPE_DP: + case XEN_BLOCK_VDEV_TYPE_XVD: + if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) { + vdev->number = (202 << 8) | (vdev->disk << 4) | + vdev->partition; + } else if (vdev->disk < (1 << 20) && vdev->partition < (1 << 8)) { + vdev->number = (1 << 28) | (vdev->disk << 8) | + vdev->partition; + } else { + goto invalid; + } + break; + + case XEN_BLOCK_VDEV_TYPE_HD: + if ((vdev->disk == 0 || vdev->disk == 1) && + vdev->partition < (1 << 6)) { + vdev->number = (3 << 8) | (vdev->disk << 6) | vdev->partition; + } else if ((vdev->disk == 2 || vdev->disk == 3) && + vdev->partition < (1 << 6)) { + vdev->number = (22 << 8) | ((vdev->disk - 2) << 6) | + vdev->partition; + } else { + goto invalid; + } + break; + + case XEN_BLOCK_VDEV_TYPE_SD: + if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) { + vdev->number = (8 << 8) | (vdev->disk << 4) | vdev->partition; + } else { + goto invalid; + } + break; + + default: + goto invalid; + } + + g_free(str); + return; + +invalid: + error_setg(errp, "invalid virtual disk specifier"); + + vdev->type = XEN_BLOCK_VDEV_TYPE_INVALID; + g_free(str); +} + +/* + * This property deals with 'vdev' names adhering to the Xen VBD naming + * scheme described in: + * + * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html + */ +const PropertyInfo xen_block_prop_vdev = { + .name = "str", + .description = "Virtual Disk specifier: d*p*/xvd*/hd*/sd*", + .get = xen_block_get_vdev, + .set = xen_block_set_vdev, +}; + +static Property xen_block_props[] = { + DEFINE_PROP("vdev", XenBlockDevice, props.vdev, + xen_block_prop_vdev, XenBlockVdev), + DEFINE_PROP_END_OF_LIST() +}; + +static void xen_block_class_init(ObjectClass *class, void *data) +{ + DeviceClass *dev_class = DEVICE_CLASS(class); + XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class); + + xendev_class->realize = xen_block_realize; + xendev_class->unrealize = xen_block_unrealize; + + dev_class->props = xen_block_props; +} + +static const TypeInfo xen_block_type_info = { + .name = TYPE_XEN_BLOCK_DEVICE, + .parent = TYPE_XEN_DEVICE, + .instance_size = sizeof(XenBlockDevice), + .abstract = true, + .class_size = sizeof(XenBlockDeviceClass), + .class_init = xen_block_class_init, +}; + +static void xen_disk_unrealize(XenBlockDevice *blockdev, Error **errp) +{ + trace_xen_disk_unrealize(); +} + +static void xen_disk_realize(XenBlockDevice *blockdev, Error **errp) +{ + trace_xen_disk_realize(); +} + +static void xen_disk_class_init(ObjectClass *class, void *data) +{ + DeviceClass *dev_class = DEVICE_CLASS(class); + XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class); + + blockdev_class->realize = xen_disk_realize; + blockdev_class->unrealize = xen_disk_unrealize; + + dev_class->desc = "Xen Disk Device"; +} + +static const TypeInfo xen_disk_type_info = { + .name = TYPE_XEN_DISK_DEVICE, + .parent = TYPE_XEN_BLOCK_DEVICE, + .instance_size = sizeof(XenDiskDevice), + .class_init = xen_disk_class_init, +}; + +static void xen_cdrom_unrealize(XenBlockDevice *blockdev, Error **errp) +{ + trace_xen_cdrom_unrealize(); +} + +static void xen_cdrom_realize(XenBlockDevice *blockdev, Error **errp) +{ + trace_xen_cdrom_realize(); +} + +static void xen_cdrom_class_init(ObjectClass *class, void *data) +{ + DeviceClass *dev_class = DEVICE_CLASS(class); + XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class); + + blockdev_class->realize = xen_cdrom_realize; + blockdev_class->unrealize = xen_cdrom_unrealize; + + dev_class->desc = "Xen CD-ROM Device"; +} + +static const TypeInfo xen_cdrom_type_info = { + .name = TYPE_XEN_CDROM_DEVICE, + .parent = TYPE_XEN_BLOCK_DEVICE, + .instance_size = sizeof(XenCDRomDevice), + .class_init = xen_cdrom_class_init, +}; + +static void xen_block_register_types(void) +{ + type_register_static(&xen_block_type_info); + type_register_static(&xen_disk_type_info); + type_register_static(&xen_cdrom_type_info); +} + +type_init(xen_block_register_types) diff --git a/include/hw/xen/xen-block.h b/include/hw/xen/xen-block.h new file mode 100644 index 0000000000..29413256e9 --- /dev/null +++ b/include/hw/xen/xen-block.h @@ -0,0 +1,73 @@ +/* + * Copyright (c) 2018 Citrix Systems Inc. + * + * 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_XEN_BLOCK_H +#define HW_XEN_BLOCK_H + +#include "hw/xen/xen-bus.h" + +typedef enum XenBlockVdevType { + XEN_BLOCK_VDEV_TYPE_INVALID, + XEN_BLOCK_VDEV_TYPE_DP, + XEN_BLOCK_VDEV_TYPE_XVD, + XEN_BLOCK_VDEV_TYPE_HD, + XEN_BLOCK_VDEV_TYPE_SD, + XEN_BLOCK_VDEV_TYPE__MAX +} XenBlockVdevType; + +typedef struct XenBlockVdev { + XenBlockVdevType type; + unsigned long disk; + unsigned long partition; + unsigned long number; +} XenBlockVdev; + +typedef struct XenBlockProperties { + XenBlockVdev vdev; +} XenBlockProperties; + +typedef struct XenBlockDevice { + XenDevice xendev; + XenBlockProperties props; +} XenBlockDevice; + +typedef void (*XenBlockDeviceRealize)(XenBlockDevice *blockdev, Error **errp); +typedef void (*XenBlockDeviceUnrealize)(XenBlockDevice *blockdev, Error **errp); + +typedef struct XenBlockDeviceClass { + /*< private >*/ + XenDeviceClass parent_class; + /*< public >*/ + XenBlockDeviceRealize realize; + XenBlockDeviceUnrealize unrealize; +} XenBlockDeviceClass; + +#define TYPE_XEN_BLOCK_DEVICE "xen-block" +#define XEN_BLOCK_DEVICE(obj) \ + OBJECT_CHECK(XenBlockDevice, (obj), TYPE_XEN_BLOCK_DEVICE) +#define XEN_BLOCK_DEVICE_CLASS(class) \ + OBJECT_CLASS_CHECK(XenBlockDeviceClass, (class), TYPE_XEN_BLOCK_DEVICE) +#define XEN_BLOCK_DEVICE_GET_CLASS(obj) \ + OBJECT_GET_CLASS(XenBlockDeviceClass, (obj), TYPE_XEN_BLOCK_DEVICE) + +typedef struct XenDiskDevice { + XenBlockDevice blockdev; +} XenDiskDevice; + +#define TYPE_XEN_DISK_DEVICE "xen-disk" +#define XEN_DISK_DEVICE(obj) \ + OBJECT_CHECK(XenDiskDevice, (obj), TYPE_XEN_DISK_DEVICE) + +typedef struct XenCDRomDevice { + XenBlockDevice blockdev; +} XenCDRomDevice; + +#define TYPE_XEN_CDROM_DEVICE "xen-cdrom" +#define XEN_CDROM_DEVICE(obj) \ + OBJECT_CHECK(XenCDRomDevice, (obj), TYPE_XEN_CDROM_DEVICE) + +#endif /* HW_XEN_BLOCK_H */