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OpenCloudOS-Kernel
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vhost_vdpa: remove unnecessary spin_lock in vhost_vring_call 

This commit removed unnecessary spin_locks in vhost_vring_call
and related operations. Because we manipulate irq offloading
contents in vhost_vdpa ioctl code path which is already
protected by dev mutex and vq mutex.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Link: https://lore.kernel.org/r/20200909065234.3313-1-lingshan.zhu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Zhu Lingshan 2020-09-09 14:52:34 +08:00 committed by Michael S. Tsirkin
parent 5745bcfbbf
commit 86e182fe12
3 changed files with 1 additions and 11 deletions
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8
drivers/vhost/vdpa.c
View File

@ -96,26 +96,20 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
return;
irq = ops->get_vq_irq(vdpa, qid);
spin_lock(&vq->call_ctx.ctx_lock);
irq_bypass_unregister_producer(&vq->call_ctx.producer);
if (!vq->call_ctx.ctx || irq < 0) {
spin_unlock(&vq->call_ctx.ctx_lock);
if (!vq->call_ctx.ctx || irq < 0)
return;
}
vq->call_ctx.producer.token = vq->call_ctx.ctx;
vq->call_ctx.producer.irq = irq;
ret = irq_bypass_register_producer(&vq->call_ctx.producer);
spin_unlock(&vq->call_ctx.ctx_lock);
}
static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid)
{
struct vhost_virtqueue *vq = &v->vqs[qid];
spin_lock(&vq->call_ctx.ctx_lock);
irq_bypass_unregister_producer(&vq->call_ctx.producer);
spin_unlock(&vq->call_ctx.ctx_lock);
}
static void vhost_vdpa_reset(struct vhost_vdpa *v)

3
drivers/vhost/vhost.c
View File

@ -302,7 +302,6 @@ static void vhost_vring_call_reset(struct vhost_vring_call *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,
@ -1650,9 +1649,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
break;
}
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)) {

1
drivers/vhost/vhost.h
View File

@ -64,7 +64,6 @@ enum vhost_uaddr_type {
struct vhost_vring_call {
struct eventfd_ctx *ctx;
struct irq_bypass_producer producer;
spinlock_t ctx_lock;
};
/* The virtqueue structure describes a queue attached to a device. */