From patchwork Fri Oct 26 11:01:44 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amit Shah X-Patchwork-Id: 194449 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 538452C009A for ; Fri, 26 Oct 2012 22:53:54 +1100 (EST) Received: from localhost ([::1]:45146 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TRhh6-00025f-Lx for incoming@patchwork.ozlabs.org; Fri, 26 Oct 2012 07:03:16 -0400 Received: from eggs.gnu.org ([208.118.235.92]:56486) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TRhgu-0001k9-Js for qemu-devel@nongnu.org; Fri, 26 Oct 2012 07:03:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TRhgp-0003DP-Ij for qemu-devel@nongnu.org; Fri, 26 Oct 2012 07:03:04 -0400 Received: from mx1.redhat.com ([209.132.183.28]:13476) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TRhgp-0003D7-7f for qemu-devel@nongnu.org; Fri, 26 Oct 2012 07:02:59 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q9QB2vRZ014926 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 26 Oct 2012 07:02:57 -0400 Received: from localhost (ovpn-113-78.phx2.redhat.com [10.3.113.78]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q9QB2rd8025877; Fri, 26 Oct 2012 07:02:54 -0400 From: Amit Shah To: Anthony Liguori Date: Fri, 26 Oct 2012 16:31:44 +0530 Message-Id: In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 209.132.183.28 Cc: Amit Shah , Anthony Liguori , qemu list Subject: [Qemu-devel] [PATCH 8/8] virtio-rng: hardware random number generator device X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list 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 The Linux kernel already has a virtio-rng driver, this is the device implementation. When the guest asks for entropy from the virtio hwrng, it puts a buffer in the vq. We then put entropy into that buffer, and push it back to the guest. Signed-off-by: Amit Shah Signed-off-by: Anthony Liguori --- hw/Makefile.objs | 1 + hw/pci.h | 1 + hw/s390-virtio-bus.c | 37 ++++++++++++ hw/s390-virtio-bus.h | 2 + hw/virtio-pci.c | 60 ++++++++++++++++++++ hw/virtio-pci.h | 2 + hw/virtio-rng.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++ hw/virtio-rng.h | 24 ++++++++ hw/virtio.h | 3 + 9 files changed, 279 insertions(+), 0 deletions(-) create mode 100644 hw/virtio-rng.c create mode 100644 hw/virtio-rng.h diff --git a/hw/Makefile.objs b/hw/Makefile.objs index af4ab0c..ea46f81 100644 --- a/hw/Makefile.objs +++ b/hw/Makefile.objs @@ -1,6 +1,7 @@ common-obj-y = usb/ ide/ common-obj-y += loader.o common-obj-$(CONFIG_VIRTIO) += virtio-console.o +common-obj-$(CONFIG_VIRTIO) += virtio-rng.o common-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o common-obj-y += fw_cfg.o common-obj-$(CONFIG_PCI) += pci.o pci_bridge.o pci_bridge_dev.o diff --git a/hw/pci.h b/hw/pci.h index 1f902f5..93e2a46 100644 --- a/hw/pci.h +++ b/hw/pci.h @@ -76,6 +76,7 @@ #define PCI_DEVICE_ID_VIRTIO_BALLOON 0x1002 #define PCI_DEVICE_ID_VIRTIO_CONSOLE 0x1003 #define PCI_DEVICE_ID_VIRTIO_SCSI 0x1004 +#define PCI_DEVICE_ID_VIRTIO_RNG 0x1005 #define FMT_PCIBUS PRIx64 diff --git a/hw/s390-virtio-bus.c b/hw/s390-virtio-bus.c index 5849a96..e0ac2d1 100644 --- a/hw/s390-virtio-bus.c +++ b/hw/s390-virtio-bus.c @@ -26,6 +26,7 @@ #include "loader.h" #include "elf.h" #include "hw/virtio.h" +#include "hw/virtio-rng.h" #include "hw/virtio-serial.h" #include "hw/virtio-net.h" #include "hw/sysbus.h" @@ -206,6 +207,18 @@ static int s390_virtio_scsi_init(VirtIOS390Device *dev) return s390_virtio_device_init(dev, vdev); } +static int s390_virtio_rng_init(VirtIOS390Device *dev) +{ + VirtIODevice *vdev; + + vdev = virtio_rng_init((DeviceState *)dev, &dev->rng); + if (!vdev) { + return -1; + } + + return s390_virtio_device_init(dev, vdev); +} + static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq) { ram_addr_t token_off; @@ -448,6 +461,29 @@ static TypeInfo s390_virtio_serial = { .class_init = s390_virtio_serial_class_init, }; +static void s390_virtio_rng_initfn(Object *obj) +{ + VirtIOS390Device *dev = VIRTIO_S390_DEVICE(obj); + + object_property_add_link(obj, "rng", TYPE_RNG_BACKEND, + (Object **)&dev->rng.rng, NULL); +} + +static void s390_virtio_rng_class_init(ObjectClass *klass, void *data) +{ + VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass); + + k->init = s390_virtio_rng_init; +} + +static TypeInfo s390_virtio_rng = { + .name = "virtio-rng-s390", + .parent = TYPE_VIRTIO_S390_DEVICE, + .instance_size = sizeof(VirtIOS390Device), + .instance_init = s390_virtio_rng_initfn, + .class_init = s390_virtio_rng_class_init, +}; + static int s390_virtio_busdev_init(DeviceState *dev) { VirtIOS390Device *_dev = (VirtIOS390Device *)dev; @@ -528,6 +564,7 @@ static void s390_virtio_register_types(void) type_register_static(&s390_virtio_blk); type_register_static(&s390_virtio_net); type_register_static(&s390_virtio_scsi); + type_register_static(&s390_virtio_rng); type_register_static(&s390_virtio_bridge_info); } diff --git a/hw/s390-virtio-bus.h b/hw/s390-virtio-bus.h index 4873134..a83afe7 100644 --- a/hw/s390-virtio-bus.h +++ b/hw/s390-virtio-bus.h @@ -19,6 +19,7 @@ #include "virtio-blk.h" #include "virtio-net.h" +#include "virtio-rng.h" #include "virtio-serial.h" #include "virtio-scsi.h" @@ -75,6 +76,7 @@ struct VirtIOS390Device { virtio_serial_conf serial; virtio_net_conf net; VirtIOSCSIConf scsi; + VirtIORNGConf rng; }; typedef struct VirtIOS390Bus { diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index c7f20c3..0dc2a06 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -880,6 +880,28 @@ static void virtio_balloon_exit_pci(PCIDevice *pci_dev) virtio_exit_pci(pci_dev); } +static int virtio_rng_init_pci(PCIDevice *pci_dev) +{ + VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); + VirtIODevice *vdev; + + vdev = virtio_rng_init(&pci_dev->qdev, &proxy->rng); + if (!vdev) { + return -1; + } + virtio_init_pci(proxy, vdev); + return 0; +} + +static void virtio_rng_exit_pci(PCIDevice *pci_dev) +{ + VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); + + virtio_pci_stop_ioeventfd(proxy); + virtio_rng_exit(proxy->vdev); + virtio_exit_pci(pci_dev); +} + static Property virtio_blk_properties[] = { DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0), DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, blk.conf), @@ -1010,6 +1032,43 @@ static TypeInfo virtio_balloon_info = { .class_init = virtio_balloon_class_init, }; +static void virtio_rng_initfn(Object *obj) +{ + PCIDevice *pci_dev = PCI_DEVICE(obj); + VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); + + object_property_add_link(obj, "rng", TYPE_RNG_BACKEND, + (Object **)&proxy->rng.rng, NULL); +} + +static Property virtio_rng_properties[] = { + DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), + DEFINE_PROP_END_OF_LIST(), +}; + +static void virtio_rng_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); + + k->init = virtio_rng_init_pci; + k->exit = virtio_rng_exit_pci; + k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; + k->device_id = PCI_DEVICE_ID_VIRTIO_RNG; + k->revision = VIRTIO_PCI_ABI_VERSION; + k->class_id = PCI_CLASS_OTHERS; + dc->reset = virtio_pci_reset; + dc->props = virtio_rng_properties; +} + +static TypeInfo virtio_rng_info = { + .name = "virtio-rng-pci", + .parent = TYPE_PCI_DEVICE, + .instance_size = sizeof(VirtIOPCIProxy), + .instance_init = virtio_rng_initfn, + .class_init = virtio_rng_class_init, +}; + static int virtio_scsi_init_pci(PCIDevice *pci_dev) { VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); @@ -1074,6 +1133,7 @@ static void virtio_pci_register_types(void) type_register_static(&virtio_serial_info); type_register_static(&virtio_balloon_info); type_register_static(&virtio_scsi_info); + type_register_static(&virtio_rng_info); } type_init(virtio_pci_register_types) diff --git a/hw/virtio-pci.h b/hw/virtio-pci.h index ac9d522..b58d9a2 100644 --- a/hw/virtio-pci.h +++ b/hw/virtio-pci.h @@ -17,6 +17,7 @@ #include "virtio-blk.h" #include "virtio-net.h" +#include "virtio-rng.h" #include "virtio-serial.h" #include "virtio-scsi.h" @@ -46,6 +47,7 @@ typedef struct { virtio_serial_conf serial; virtio_net_conf net; VirtIOSCSIConf scsi; + VirtIORNGConf rng; bool ioeventfd_disabled; bool ioeventfd_started; VirtIOIRQFD *vector_irqfd; diff --git a/hw/virtio-rng.c b/hw/virtio-rng.c new file mode 100644 index 0000000..290b2b6 --- /dev/null +++ b/hw/virtio-rng.c @@ -0,0 +1,149 @@ +/* + * A virtio device implementing a hardware random number generator. + * + * Copyright 2012 Red Hat, Inc. + * Copyright 2012 Amit Shah + * + * This work is licensed under the terms of the GNU GPL, version 2 or + * (at your option) any later version. See the COPYING file in the + * top-level directory. + */ + +#include "iov.h" +#include "qdev.h" +#include "virtio.h" +#include "virtio-rng.h" +#include "qemu/rng.h" + +typedef struct VirtIORNG { + VirtIODevice vdev; + + DeviceState *qdev; + + /* Only one vq - guest puts buffer(s) on it when it needs entropy */ + VirtQueue *vq; + + VirtIORNGConf *conf; + + RngBackend *rng; +} VirtIORNG; + +static bool is_guest_ready(VirtIORNG *vrng) +{ + if (virtio_queue_ready(vrng->vq) + && (vrng->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { + return true; + } + return false; +} + +static size_t get_request_size(VirtQueue *vq) +{ + unsigned int in, out; + + virtqueue_get_avail_bytes(vq, &in, &out); + return in; +} + +/* Send data from a char device over to the guest */ +static void chr_read(void *opaque, const void *buf, size_t size) +{ + VirtIORNG *vrng = opaque; + VirtQueueElement elem; + size_t len; + int offset; + + if (!is_guest_ready(vrng)) { + return; + } + + offset = 0; + while (offset < size) { + if (!virtqueue_pop(vrng->vq, &elem)) { + break; + } + len = iov_from_buf(elem.in_sg, elem.in_num, + 0, buf + offset, size - offset); + offset += len; + + virtqueue_push(vrng->vq, &elem, len); + } + virtio_notify(&vrng->vdev, vrng->vq); +} + +static void handle_input(VirtIODevice *vdev, VirtQueue *vq) +{ + VirtIORNG *vrng = DO_UPCAST(VirtIORNG, vdev, vdev); + size_t size; + + size = get_request_size(vq); + if (size) { + rng_backend_request_entropy(vrng->rng, size, chr_read, vrng); + } +} + +static uint32_t get_features(VirtIODevice *vdev, uint32_t f) +{ + return f; +} + +static void virtio_rng_save(QEMUFile *f, void *opaque) +{ + VirtIORNG *vrng = opaque; + + virtio_save(&vrng->vdev, f); +} + +static int virtio_rng_load(QEMUFile *f, void *opaque, int version_id) +{ + VirtIORNG *vrng = opaque; + + if (version_id != 1) { + return -EINVAL; + } + virtio_load(&vrng->vdev, f); + return 0; +} + +VirtIODevice *virtio_rng_init(DeviceState *dev, VirtIORNGConf *conf) +{ + VirtIORNG *vrng; + VirtIODevice *vdev; + Error *local_err = NULL; + + vdev = virtio_common_init("virtio-rng", VIRTIO_ID_RNG, 0, + sizeof(VirtIORNG)); + + vrng = DO_UPCAST(VirtIORNG, vdev, vdev); + + vrng->rng = conf->rng; + if (vrng->rng == NULL) { + qerror_report(QERR_INVALID_PARAMETER_VALUE, "rng", "a valid object"); + return NULL; + } + + rng_backend_open(vrng->rng, &local_err); + if (local_err) { + qerror_report_err(local_err); + error_free(local_err); + return NULL; + } + + vrng->vq = virtio_add_queue(vdev, 8, handle_input); + vrng->vdev.get_features = get_features; + + vrng->qdev = dev; + vrng->conf = conf; + register_savevm(dev, "virtio-rng", -1, 1, virtio_rng_save, + virtio_rng_load, vrng); + + return vdev; +} + +void virtio_rng_exit(VirtIODevice *vdev) +{ + VirtIORNG *vrng = DO_UPCAST(VirtIORNG, vdev, vdev); + + unregister_savevm(vrng->qdev, "virtio-rng", vrng); + virtio_cleanup(vdev); +} diff --git a/hw/virtio-rng.h b/hw/virtio-rng.h new file mode 100644 index 0000000..fbb0104 --- /dev/null +++ b/hw/virtio-rng.h @@ -0,0 +1,24 @@ +/* + * Virtio RNG Support + * + * Copyright Red Hat, Inc. 2012 + * Copyright Amit Shah + * + * This work is licensed under the terms of the GNU GPL, version 2 or + * (at your option) any later version. See the COPYING file in the + * top-level directory. + */ + +#ifndef _QEMU_VIRTIO_RNG_H +#define _QEMU_VIRTIO_RNG_H + +#include "qemu/rng.h" + +/* The Virtio ID for the virtio rng device */ +#define VIRTIO_ID_RNG 4 + +struct VirtIORNGConf { + RngBackend *rng; +}; + +#endif diff --git a/hw/virtio.h b/hw/virtio.h index ac482be..df8d0f7 100644 --- a/hw/virtio.h +++ b/hw/virtio.h @@ -203,6 +203,8 @@ VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *serial); VirtIODevice *virtio_balloon_init(DeviceState *dev); typedef struct VirtIOSCSIConf VirtIOSCSIConf; VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *conf); +typedef struct VirtIORNGConf VirtIORNGConf; +VirtIODevice *virtio_rng_init(DeviceState *dev, VirtIORNGConf *conf); #ifdef CONFIG_LINUX VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf); #endif @@ -213,6 +215,7 @@ void virtio_blk_exit(VirtIODevice *vdev); void virtio_serial_exit(VirtIODevice *vdev); void virtio_balloon_exit(VirtIODevice *vdev); void virtio_scsi_exit(VirtIODevice *vdev); +void virtio_rng_exit(VirtIODevice *vdev); #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \ DEFINE_PROP_BIT("indirect_desc", _state, _field, \