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    Subject[RFC PATCH v2 17/19] kvm: Add guest-side support for VBUS
    Date
    This adds a driver to interface between the host VBUS support, and the
    guest-vbus bus model.

    Signed-off-by: Gregory Haskins <ghaskins@novell.com>
    ---

    arch/x86/Kconfig | 9 +
    drivers/Makefile | 1
    drivers/vbus/proxy/Makefile | 2
    drivers/vbus/proxy/kvm.c | 726 +++++++++++++++++++++++++++++++++++++++++++
    4 files changed, 738 insertions(+), 0 deletions(-)
    create mode 100644 drivers/vbus/proxy/Makefile
    create mode 100644 drivers/vbus/proxy/kvm.c

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index 91fefd5..8661495 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -451,6 +451,15 @@ config KVM_GUEST_DYNIRQ
    depends on KVM_GUEST
    default y

    +config KVM_GUEST_VBUS
    + tristate "KVM virtual-bus (VBUS) guest-side support"
    + depends on KVM_GUEST
    + select VBUS_DRIVERS
    + default y
    + ---help---
    + This option enables guest-side support for accessing virtual-bus
    + devices.
    +
    source "arch/x86/lguest/Kconfig"

    config PARAVIRT
    diff --git a/drivers/Makefile b/drivers/Makefile
    index 98fab51..4f2cb93 100644
    --- a/drivers/Makefile
    +++ b/drivers/Makefile
    @@ -107,3 +107,4 @@ obj-$(CONFIG_VIRTIO) += virtio/
    obj-$(CONFIG_STAGING) += staging/
    obj-y += platform/
    obj-$(CONFIG_VBUS_DEVICES) += vbus/devices/
    +obj-$(CONFIG_VBUS_DRIVERS) += vbus/proxy/
    diff --git a/drivers/vbus/proxy/Makefile b/drivers/vbus/proxy/Makefile
    new file mode 100644
    index 0000000..c18d58d
    --- /dev/null
    +++ b/drivers/vbus/proxy/Makefile
    @@ -0,0 +1,2 @@
    +kvm-guest-vbus-objs += kvm.o
    +obj-$(CONFIG_KVM_GUEST_VBUS) += kvm-guest-vbus.o
    diff --git a/drivers/vbus/proxy/kvm.c b/drivers/vbus/proxy/kvm.c
    new file mode 100644
    index 0000000..82e28b4
    --- /dev/null
    +++ b/drivers/vbus/proxy/kvm.c
    @@ -0,0 +1,726 @@
    +/*
    + * Copyright (C) 2009 Novell. All Rights Reserved.
    + *
    + * Author:
    + * Gregory Haskins <ghaskins@novell.com>
    + *
    + * This file is free software; you can redistribute it and/or modify
    + * it under the terms of version 2 of the GNU General Public License
    + * as published by the Free Software Foundation.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software Foundation,
    + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/vbus.h>
    +#include <linux/kvm_para.h>
    +#include <linux/kvm.h>
    +#include <linux/mm.h>
    +#include <linux/ioq.h>
    +#include <linux/interrupt.h>
    +#include <linux/kvm_para.h>
    +#include <linux/kvm_guest.h>
    +#include <linux/vbus_client.h>
    +#include <linux/vbus_driver.h>
    +
    +MODULE_AUTHOR("Gregory Haskins");
    +MODULE_LICENSE("GPL");
    +MODULE_VERSION("1");
    +
    +static int kvm_vbus_hypercall(unsigned long nr, void *data, unsigned long len)
    +{
    + return kvm_hypercall3(KVM_HC_VBUS, nr, __pa(data), len);
    +}
    +
    +struct kvm_vbus {
    + spinlock_t lock;
    + struct ioq eventq;
    + struct kvm_vbus_event *ring;
    + int irq;
    +};
    +
    +static struct kvm_vbus kvm_vbus;
    +
    +struct kvm_vbus_device {
    + char type[VBUS_MAX_DEVTYPE_LEN];
    + u64 handle;
    + struct list_head shms;
    + struct vbus_device_proxy vdev;
    +};
    +
    +/*
    + * -------------------
    + * common routines
    + * -------------------
    + */
    +
    +struct kvm_vbus_device *
    +to_dev(struct vbus_device_proxy *vdev)
    +{
    + return container_of(vdev, struct kvm_vbus_device, vdev);
    +}
    +
    +static void
    +_signal_init(struct shm_signal *signal, struct shm_signal_desc *desc,
    + struct shm_signal_ops *ops)
    +{
    + desc->magic = SHM_SIGNAL_MAGIC;
    + desc->ver = SHM_SIGNAL_VER;
    +
    + shm_signal_init(signal);
    +
    + signal->locale = shm_locality_north;
    + signal->ops = ops;
    + signal->desc = desc;
    +}
    +
    +/*
    + * -------------------
    + * _signal
    + * -------------------
    + */
    +
    +struct _signal {
    + struct kvm_vbus *kvbus;
    + struct shm_signal signal;
    + u64 handle;
    + struct rb_node node;
    + struct list_head list;
    +};
    +
    +static struct _signal *
    +to_signal(struct shm_signal *signal)
    +{
    + return container_of(signal, struct _signal, signal);
    +}
    +
    +static struct _signal *
    +node_to_signal(struct rb_node *node)
    +{
    + return container_of(node, struct _signal, node);
    +}
    +
    +static int
    +_signal_inject(struct shm_signal *signal)
    +{
    + struct _signal *_signal = to_signal(signal);
    +
    + kvm_vbus_hypercall(KVM_VBUS_OP_SHMSIGNAL,
    + &_signal->handle, sizeof(_signal->handle));
    +
    + return 0;
    +}
    +
    +static void
    +_signal_release(struct shm_signal *signal)
    +{
    + struct _signal *_signal = to_signal(signal);
    +
    + kfree(_signal);
    +}
    +
    +static struct shm_signal_ops _signal_ops = {
    + .inject = _signal_inject,
    + .release = _signal_release,
    +};
    +
    +/*
    + * -------------------
    + * vbus_device_proxy routines
    + * -------------------
    + */
    +
    +static int
    +kvm_vbus_device_open(struct vbus_device_proxy *vdev, int version, int flags)
    +{
    + struct kvm_vbus_device *dev = to_dev(vdev);
    + struct vbus_deviceopen params;
    + int ret;
    +
    + if (dev->handle)
    + return -EINVAL;
    +
    + params.devid = vdev->id;
    + params.version = version;
    +
    + ret = kvm_vbus_hypercall(KVM_VBUS_OP_DEVOPEN,
    + &params, sizeof(params));
    + if (ret < 0)
    + return ret;
    +
    + dev->handle = params.handle;
    +
    + return 0;
    +}
    +
    +static int
    +kvm_vbus_device_close(struct vbus_device_proxy *vdev, int flags)
    +{
    + struct kvm_vbus_device *dev = to_dev(vdev);
    + unsigned long iflags;
    + int ret;
    +
    + if (!dev->handle)
    + return -EINVAL;
    +
    + spin_lock_irqsave(&kvm_vbus.lock, iflags);
    +
    + while (!list_empty(&dev->shms)) {
    + struct _signal *_signal;
    +
    + _signal = list_first_entry(&dev->shms, struct _signal, list);
    +
    + list_del(&_signal->list);
    +
    + spin_unlock_irqrestore(&kvm_vbus.lock, iflags);
    + shm_signal_put(&_signal->signal);
    + spin_lock_irqsave(&kvm_vbus.lock, iflags);
    + }
    +
    + spin_unlock_irqrestore(&kvm_vbus.lock, iflags);
    +
    + /*
    + * The DEVICECLOSE will implicitly close all of the shm on the
    + * host-side, so there is no need to do an explicit per-shm
    + * hypercall
    + */
    + ret = kvm_vbus_hypercall(KVM_VBUS_OP_DEVCLOSE,
    + &dev->handle, sizeof(dev->handle));
    +
    + if (ret < 0)
    + printk(KERN_ERR "KVM-VBUS: Error closing device %s/%lld: %d\n",
    + vdev->type, vdev->id, ret);
    +
    + dev->handle = 0;
    +
    + return 0;
    +}
    +
    +static int
    +kvm_vbus_device_shm(struct vbus_device_proxy *vdev, int id, int prio,
    + void *ptr, size_t len,
    + struct shm_signal_desc *sdesc, struct shm_signal **signal,
    + int flags)
    +{
    + struct kvm_vbus_device *dev = to_dev(vdev);
    + struct _signal *_signal = NULL;
    + struct vbus_deviceshm params;
    + unsigned long iflags;
    + int ret;
    +
    + if (!dev->handle)
    + return -EINVAL;
    +
    + params.devh = dev->handle;
    + params.id = id;
    + params.flags = flags;
    + params.datap = (u64)__pa(ptr);
    + params.len = len;
    +
    + if (signal) {
    + /*
    + * The signal descriptor must be embedded within the
    + * provided ptr
    + */
    + if (!sdesc
    + || (len < sizeof(*sdesc))
    + || ((void *)sdesc < ptr)
    + || ((void *)sdesc > (ptr + len - sizeof(*sdesc))))
    + return -EINVAL;
    +
    + _signal = kzalloc(sizeof(*_signal), GFP_KERNEL);
    + if (!_signal)
    + return -ENOMEM;
    +
    + _signal_init(&_signal->signal, sdesc, &_signal_ops);
    +
    + /*
    + * take another reference for the host. This is dropped
    + * by a SHMCLOSE event
    + */
    + shm_signal_get(&_signal->signal);
    +
    + params.signal.offset = (u64)sdesc - (u64)ptr;
    + params.signal.prio = prio;
    + params.signal.cookie = (u64)_signal;
    +
    + } else
    + params.signal.offset = -1; /* yes, this is a u32, but its ok */
    +
    + ret = kvm_vbus_hypercall(KVM_VBUS_OP_DEVSHM,
    + &params, sizeof(params));
    + if (ret < 0) {
    + if (_signal) {
    + /*
    + * We held two references above, so we need to drop
    + * both of them
    + */
    + shm_signal_put(&_signal->signal);
    + shm_signal_put(&_signal->signal);
    + }
    +
    + return ret;
    + }
    +
    + if (signal) {
    + _signal->handle = params.handle;
    +
    + spin_lock_irqsave(&kvm_vbus.lock, iflags);
    +
    + list_add_tail(&_signal->list, &dev->shms);
    +
    + spin_unlock_irqrestore(&kvm_vbus.lock, iflags);
    +
    + shm_signal_get(&_signal->signal);
    + *signal = &_signal->signal;
    + }
    +
    + return 0;
    +}
    +
    +static int
    +kvm_vbus_device_call(struct vbus_device_proxy *vdev, u32 func, void *data,
    + size_t len, int flags)
    +{
    + struct kvm_vbus_device *dev = to_dev(vdev);
    + struct vbus_devicecall params = {
    + .devh = dev->handle,
    + .func = func,
    + .datap = (u64)__pa(data),
    + .len = len,
    + .flags = flags,
    + };
    +
    + if (!dev->handle)
    + return -EINVAL;
    +
    + return kvm_vbus_hypercall(KVM_VBUS_OP_DEVCALL, &params, sizeof(params));
    +}
    +
    +static void
    +kvm_vbus_device_release(struct vbus_device_proxy *vdev)
    +{
    + struct kvm_vbus_device *_dev = to_dev(vdev);
    +
    + kvm_vbus_device_close(vdev, 0);
    +
    + kfree(_dev);
    +}
    +
    +struct vbus_device_proxy_ops kvm_vbus_device_ops = {
    + .open = kvm_vbus_device_open,
    + .close = kvm_vbus_device_close,
    + .shm = kvm_vbus_device_shm,
    + .call = kvm_vbus_device_call,
    + .release = kvm_vbus_device_release,
    +};
    +
    +/*
    + * -------------------
    + * vbus events
    + * -------------------
    + */
    +
    +static void
    +event_devadd(struct kvm_vbus_add_event *event)
    +{
    + int ret;
    + struct kvm_vbus_device *new = kzalloc(sizeof(*new), GFP_KERNEL);
    + if (!new) {
    + printk(KERN_ERR "KVM_VBUS: Out of memory on add_event\n");
    + return;
    + }
    +
    + INIT_LIST_HEAD(&new->shms);
    +
    + memcpy(new->type, event->type, VBUS_MAX_DEVTYPE_LEN);
    + new->vdev.type = new->type;
    + new->vdev.id = event->id;
    + new->vdev.ops = &kvm_vbus_device_ops;
    +
    + sprintf(new->vdev.dev.bus_id, "%lld", event->id);
    +
    + ret = vbus_device_proxy_register(&new->vdev);
    + if (ret < 0)
    + panic("failed to register device %lld(%s): %d\n",
    + event->id, event->type, ret);
    +}
    +
    +static void
    +event_devdrop(struct kvm_vbus_handle_event *event)
    +{
    + struct vbus_device_proxy *dev = vbus_device_proxy_find(event->handle);
    +
    + if (!dev) {
    + printk(KERN_WARNING "KVM-VBUS: devdrop failed: %lld\n",
    + event->handle);
    + return;
    + }
    +
    + vbus_device_proxy_unregister(dev);
    +}
    +
    +static void
    +event_shmsignal(struct kvm_vbus_handle_event *event)
    +{
    + struct _signal *_signal = (struct _signal *)event->handle;
    +
    + _shm_signal_wakeup(&_signal->signal);
    +}
    +
    +static void
    +event_shmclose(struct kvm_vbus_handle_event *event)
    +{
    + struct _signal *_signal = (struct _signal *)event->handle;
    +
    + /*
    + * This reference was taken during the DEVICESHM call
    + */
    + shm_signal_put(&_signal->signal);
    +}
    +
    +/*
    + * -------------------
    + * eventq routines
    + * -------------------
    + */
    +
    +static struct ioq_notifier eventq_notifier;
    +
    +static int __init
    +eventq_init(int qlen)
    +{
    + struct ioq_iterator iter;
    + int ret;
    + int i;
    +
    + kvm_vbus.ring = kzalloc(sizeof(struct kvm_vbus_event) * qlen,
    + GFP_KERNEL);
    + if (!kvm_vbus.ring)
    + return -ENOMEM;
    +
    + /*
    + * We want to iterate on the "valid" index. By default the iterator
    + * will not "autoupdate" which means it will not hypercall the host
    + * with our changes. This is good, because we are really just
    + * initializing stuff here anyway. Note that you can always manually
    + * signal the host with ioq_signal() if the autoupdate feature is not
    + * used.
    + */
    + ret = ioq_iter_init(&kvm_vbus.eventq, &iter, ioq_idxtype_valid, 0);
    + BUG_ON(ret < 0);
    +
    + /*
    + * Seek to the tail of the valid index (which should be our first
    + * item since the queue is brand-new)
    + */
    + ret = ioq_iter_seek(&iter, ioq_seek_tail, 0, 0);
    + BUG_ON(ret < 0);
    +
    + /*
    + * Now populate each descriptor with an empty vbus_event and mark it
    + * valid
    + */
    + for (i = 0; i < qlen; i++) {
    + struct kvm_vbus_event *event = &kvm_vbus.ring[i];
    + size_t len = sizeof(*event);
    + struct ioq_ring_desc *desc = iter.desc;
    +
    + BUG_ON(iter.desc->valid);
    +
    + desc->cookie = (u64)event;
    + desc->ptr = (u64)__pa(event);
    + desc->len = len; /* total length */
    + desc->valid = 1;
    +
    + /*
    + * This push operation will simultaneously advance the
    + * valid-tail index and increment our position in the queue
    + * by one.
    + */
    + ret = ioq_iter_push(&iter, 0);
    + BUG_ON(ret < 0);
    + }
    +
    + kvm_vbus.eventq.notifier = &eventq_notifier;
    +
    + /*
    + * And finally, ensure that we can receive notification
    + */
    + ioq_notify_enable(&kvm_vbus.eventq, 0);
    +
    + return 0;
    +}
    +
    +/* Invoked whenever the hypervisor ioq_signal()s our eventq */
    +static void
    +eventq_wakeup(struct ioq_notifier *notifier)
    +{
    + struct ioq_iterator iter;
    + int ret;
    +
    + /* We want to iterate on the head of the in-use index */
    + ret = ioq_iter_init(&kvm_vbus.eventq, &iter, ioq_idxtype_inuse, 0);
    + BUG_ON(ret < 0);
    +
    + ret = ioq_iter_seek(&iter, ioq_seek_head, 0, 0);
    + BUG_ON(ret < 0);
    +
    + /*
    + * The EOM is indicated by finding a packet that is still owned by
    + * the south side.
    + *
    + * FIXME: This in theory could run indefinitely if the host keeps
    + * feeding us events since there is nothing like a NAPI budget. We
    + * might need to address that
    + */
    + while (!iter.desc->sown) {
    + struct ioq_ring_desc *desc = iter.desc;
    + struct kvm_vbus_event *event;
    +
    + event = (struct kvm_vbus_event *)desc->cookie;
    +
    + switch (event->eventid) {
    + case KVM_VBUS_EVENT_DEVADD:
    + event_devadd(&event->data.add);
    + break;
    + case KVM_VBUS_EVENT_DEVDROP:
    + event_devdrop(&event->data.handle);
    + break;
    + case KVM_VBUS_EVENT_SHMSIGNAL:
    + event_shmsignal(&event->data.handle);
    + break;
    + case KVM_VBUS_EVENT_SHMCLOSE:
    + event_shmclose(&event->data.handle);
    + break;
    + default:
    + printk(KERN_WARNING "KVM_VBUS: Unexpected event %d\n",
    + event->eventid);
    + break;
    + };
    +
    + memset(event, 0, sizeof(*event));
    +
    + /* Advance the in-use head */
    + ret = ioq_iter_pop(&iter, 0);
    + BUG_ON(ret < 0);
    + }
    +
    + /* And let the south side know that we changed the queue */
    + ioq_signal(&kvm_vbus.eventq, 0);
    +}
    +
    +static struct ioq_notifier eventq_notifier = {
    + .signal = &eventq_wakeup,
    +};
    +
    +/* Injected whenever the host issues an ioq_signal() on the eventq */
    +irqreturn_t
    +eventq_intr(int irq, void *dev)
    +{
    + _shm_signal_wakeup(kvm_vbus.eventq.signal);
    +
    + return IRQ_HANDLED;
    +}
    +
    +/*
    + * -------------------
    + */
    +
    +static int
    +eventq_signal_inject(struct shm_signal *signal)
    +{
    + u64 handle = 0; /* The eventq uses the special-case handle=0 */
    +
    + kvm_vbus_hypercall(KVM_VBUS_OP_SHMSIGNAL, &handle, sizeof(handle));
    +
    + return 0;
    +}
    +
    +static void
    +eventq_signal_release(struct shm_signal *signal)
    +{
    + kfree(signal);
    +}
    +
    +static struct shm_signal_ops eventq_signal_ops = {
    + .inject = eventq_signal_inject,
    + .release = eventq_signal_release,
    +};
    +
    +/*
    + * -------------------
    + */
    +
    +static void
    +eventq_ioq_release(struct ioq *ioq)
    +{
    + /* released as part of the kvm_vbus object */
    +}
    +
    +static struct ioq_ops eventq_ioq_ops = {
    + .release = eventq_ioq_release,
    +};
    +
    +/*
    + * -------------------
    + */
    +
    +static void
    +kvm_vbus_release(void)
    +{
    + if (kvm_vbus.irq > 0) {
    + free_irq(kvm_vbus.irq, NULL);
    + destroy_kvm_dynirq(kvm_vbus.irq);
    + }
    +
    + kfree(kvm_vbus.eventq.head_desc);
    + kfree(kvm_vbus.ring);
    +}
    +
    +static int __init
    +kvm_vbus_open(void)
    +{
    + struct kvm_vbus_busopen params = {
    + .magic = KVM_VBUS_MAGIC,
    + .version = KVM_VBUS_VERSION,
    + .capabilities = 0,
    + };
    +
    + return kvm_vbus_hypercall(KVM_VBUS_OP_BUSOPEN, &params, sizeof(params));
    +}
    +
    +#define QLEN 1024
    +
    +static int __init
    +kvm_vbus_register(void)
    +{
    + struct kvm_vbus_busreg params = {
    + .count = 1,
    + .eventq = {
    + {
    + .irq = kvm_vbus.irq,
    + .count = QLEN,
    + .ring = (u64)__pa(kvm_vbus.eventq.head_desc),
    + .data = (u64)__pa(kvm_vbus.ring),
    + },
    + },
    + };
    +
    + return kvm_vbus_hypercall(KVM_VBUS_OP_BUSREG, &params, sizeof(params));
    +}
    +
    +static int __init
    +_ioq_init(size_t ringsize, struct ioq *ioq, struct ioq_ops *ops)
    +{
    + struct shm_signal *signal = NULL;
    + struct ioq_ring_head *head = NULL;
    + size_t len = IOQ_HEAD_DESC_SIZE(ringsize);
    +
    + head = kzalloc(len, GFP_KERNEL | GFP_DMA);
    + if (!head)
    + return -ENOMEM;
    +
    + signal = kzalloc(sizeof(*signal), GFP_KERNEL);
    + if (!signal) {
    + kfree(head);
    + return -ENOMEM;
    + }
    +
    + head->magic = IOQ_RING_MAGIC;
    + head->ver = IOQ_RING_VER;
    + head->count = ringsize;
    +
    + _signal_init(signal, &head->signal, &eventq_signal_ops);
    +
    + ioq_init(ioq, ops, ioq_locality_north, head, signal, ringsize);
    +
    + return 0;
    +}
    +
    +int __init
    +kvm_vbus_init(void)
    +{
    + int ret;
    +
    + memset(&kvm_vbus, 0, sizeof(kvm_vbus));
    +
    + ret = kvm_para_has_feature(KVM_FEATURE_VBUS);
    + if (!ret)
    + return -ENOENT;
    +
    + ret = kvm_vbus_open();
    + if (ret < 0) {
    + printk(KERN_ERR "KVM_VBUS: Could not register with host: %d\n",
    + ret);
    + goto out_fail;
    + }
    +
    + spin_lock_init(&kvm_vbus.lock);
    +
    + /*
    + * Allocate an IOQ to use for host-2-guest event notification
    + */
    + ret = _ioq_init(QLEN, &kvm_vbus.eventq, &eventq_ioq_ops);
    + if (ret < 0) {
    + printk(KERN_ERR "KVM_VBUS: Cound not init eventq\n");
    + goto out_fail;
    + }
    +
    + ret = eventq_init(QLEN);
    + if (ret < 0) {
    + printk(KERN_ERR "KVM_VBUS: Cound not setup ring\n");
    + goto out_fail;
    + }
    +
    + /*
    + * Dynamically assign a free IRQ to this resource
    + */
    + kvm_vbus.irq = create_kvm_dynirq(0);
    + if (kvm_vbus.irq < 0) {
    + printk(KERN_ERR "KVM_VBUS: Failed to create IRQ\n");
    + goto out_fail;
    + }
    +
    + ret = request_irq(kvm_vbus.irq, eventq_intr, 0, "vbus", NULL);
    + if (ret < 0) {
    + printk(KERN_ERR "KVM_VBUS: Failed to register IRQ %d\n: %d",
    + kvm_vbus.irq, ret);
    + goto out_fail;
    + }
    +
    + /*
    + * Finally register our queue on the host to start receiving events
    + */
    + ret = kvm_vbus_register();
    + if (ret < 0) {
    + printk(KERN_ERR "KVM_VBUS: Could not register with host: %d\n",
    + ret);
    + goto out_fail;
    + }
    +
    + return 0;
    +
    + out_fail:
    + kvm_vbus_release();
    +
    + return ret;
    +
    +}
    +
    +static void __exit
    +kvm_vbus_exit(void)
    +{
    + kvm_vbus_release();
    +}
    +
    +module_init(kvm_vbus_init);
    +module_exit(kvm_vbus_exit);
    +


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      Last update: 2009-04-09 18:43    [W:0.076 / U:0.804 seconds]
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