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Date: Mon, 20 Jul 2020 15:40:13 +0800
From: "Zhu, Lingshan" <lingshan.zhu@...el.com>
To: Jason Wang <jasowang@...hat.com>, mst@...hat.com,
alex.williamson@...hat.com, pbonzini@...hat.com,
sean.j.christopherson@...el.com, wanpengli@...cent.com
Cc: virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
kvm@...r.kernel.org
Subject: Re: [PATCH V2 1/6] vhost: introduce vhost_call_ctx
On 7/17/2020 11:32 AM, Jason Wang wrote:
>
> On 2020/7/16 下午7:23, Zhu Lingshan wrote:
>> This commit introduces struct vhost_call_ctx which replaced
>> raw struct eventfd_ctx *call_ctx in struct vhost_virtqueue.
>> Besides eventfd_ctx, it contains a spin lock and an
>> irq_bypass_producer in its structure.
>>
>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>> Suggested-by: Jason Wang <jasowang@...hat.com>
>> ---
>> drivers/vhost/vdpa.c | 4 ++--
>> drivers/vhost/vhost.c | 22 ++++++++++++++++------
>> drivers/vhost/vhost.h | 9 ++++++++-
>> 3 files changed, 26 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
>> index 7580e34..2fcc422 100644
>> --- a/drivers/vhost/vdpa.c
>> +++ b/drivers/vhost/vdpa.c
>> @@ -96,7 +96,7 @@ static void handle_vq_kick(struct vhost_work *work)
>> static irqreturn_t vhost_vdpa_virtqueue_cb(void *private)
>> {
>> struct vhost_virtqueue *vq = private;
>> - struct eventfd_ctx *call_ctx = vq->call_ctx;
>> + struct eventfd_ctx *call_ctx = vq->call_ctx.ctx;
>> if (call_ctx)
>> eventfd_signal(call_ctx, 1);
>> @@ -382,7 +382,7 @@ static long vhost_vdpa_vring_ioctl(struct
>> vhost_vdpa *v, unsigned int cmd,
>> break;
>> case VHOST_SET_VRING_CALL:
>> - if (vq->call_ctx) {
>> + if (vq->call_ctx.ctx) {
>> cb.callback = vhost_vdpa_virtqueue_cb;
>> cb.private = vq;
>> } else {
>> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
>> index d7b8df3..4004e94 100644
>> --- a/drivers/vhost/vhost.c
>> +++ b/drivers/vhost/vhost.c
>> @@ -298,6 +298,13 @@ static void vhost_vq_meta_reset(struct vhost_dev
>> *d)
>> __vhost_vq_meta_reset(d->vqs[i]);
>> }
>> +static void vhost_call_ctx_reset(struct vhost_call_ctx *call_ctx)
>> +{
>> + call_ctx->ctx = NULL;
>> + memset(&call_ctx->producer, 0x0, sizeof(struct
>> irq_bypass_producer));
>> + spin_lock_init(&call_ctx->ctx_lock);
>> +}
>> +
>> static void vhost_vq_reset(struct vhost_dev *dev,
>> struct vhost_virtqueue *vq)
>> {
>> @@ -319,13 +326,13 @@ static void vhost_vq_reset(struct vhost_dev *dev,
>> vq->log_base = NULL;
>> vq->error_ctx = NULL;
>> vq->kick = NULL;
>> - vq->call_ctx = NULL;
>> vq->log_ctx = NULL;
>> vhost_reset_is_le(vq);
>> vhost_disable_cross_endian(vq);
>> vq->busyloop_timeout = 0;
>> vq->umem = NULL;
>> vq->iotlb = NULL;
>> + vhost_call_ctx_reset(&vq->call_ctx);
>> __vhost_vq_meta_reset(vq);
>> }
>> @@ -685,8 +692,8 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
>> eventfd_ctx_put(dev->vqs[i]->error_ctx);
>> if (dev->vqs[i]->kick)
>> fput(dev->vqs[i]->kick);
>> - if (dev->vqs[i]->call_ctx)
>> - eventfd_ctx_put(dev->vqs[i]->call_ctx);
>> + if (dev->vqs[i]->call_ctx.ctx)
>> + eventfd_ctx_put(dev->vqs[i]->call_ctx.ctx);
>> vhost_vq_reset(dev, dev->vqs[i]);
>> }
>> vhost_dev_free_iovecs(dev);
>> @@ -1629,7 +1636,10 @@ long vhost_vring_ioctl(struct vhost_dev *d,
>> unsigned int ioctl, void __user *arg
>> r = PTR_ERR(ctx);
>> break;
>> }
>> - swap(ctx, vq->call_ctx);
>> +
>> + spin_lock(&vq->call_ctx.ctx_lock);
>> + swap(ctx, vq->call_ctx.ctx);
>> + spin_unlock(&vq->call_ctx.ctx_lock);
>> break;
>> case VHOST_SET_VRING_ERR:
>> if (copy_from_user(&f, argp, sizeof f)) {
>> @@ -2440,8 +2450,8 @@ static bool vhost_notify(struct vhost_dev *dev,
>> struct vhost_virtqueue *vq)
>> void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
>> {
>> /* Signal the Guest tell them we used something up. */
>> - if (vq->call_ctx && vhost_notify(dev, vq))
>> - eventfd_signal(vq->call_ctx, 1);
>> + if (vq->call_ctx.ctx && vhost_notify(dev, vq))
>> + eventfd_signal(vq->call_ctx.ctx, 1);
>> }
>> EXPORT_SYMBOL_GPL(vhost_signal);
>> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
>> index c8e96a0..402c62e 100644
>> --- a/drivers/vhost/vhost.h
>> +++ b/drivers/vhost/vhost.h
>> @@ -13,6 +13,7 @@
>> #include <linux/virtio_ring.h>
>> #include <linux/atomic.h>
>> #include <linux/vhost_iotlb.h>
>> +#include <linux/irqbypass.h>
>> struct vhost_work;
>> typedef void (*vhost_work_fn_t)(struct vhost_work *work);
>> @@ -60,6 +61,12 @@ enum vhost_uaddr_type {
>> VHOST_NUM_ADDRS = 3,
>> };
>> +struct vhost_call_ctx {
>
>
> I think maybe "vhost_vring_call" is a better name since it contains
> not only the eventfd_ctx now.
>
> Thanks
Sure
>
>
>> + struct eventfd_ctx *ctx;
>> + struct irq_bypass_producer producer;
>> + spinlock_t ctx_lock;
>> +};
>> +
>> /* The virtqueue structure describes a queue attached to a device. */
>> struct vhost_virtqueue {
>> struct vhost_dev *dev;
>> @@ -72,7 +79,7 @@ struct vhost_virtqueue {
>> vring_used_t __user *used;
>> const struct vhost_iotlb_map *meta_iotlb[VHOST_NUM_ADDRS];
>> struct file *kick;
>> - struct eventfd_ctx *call_ctx;
>> + struct vhost_call_ctx call_ctx;
>> struct eventfd_ctx *error_ctx;
>> struct eventfd_ctx *log_ctx;
>
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