From: jiangdongxu jiangdongxu1@huawei.com
virt inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8TP8X
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These new ioctl add support for setting bitmaps config, like base address and buffer size from userspace.
When setup migration, VMM will call VHOST_SET_LOG_BASE and VHOST_SET_LOG_SIZE to set address and size of buffer used for storing bitmaps.
Then VMM start live migration, VMM will enable logging vhost device by set feature VHOST_F_LOG_ALL.
And during live migration iterate, VMM get dirty page info from vhost device by calling VHOST_LOG_SYNC.
Signed-off-by: jiangdongxu jiangdongxu1@huawei.com --- drivers/vhost/vdpa.c | 49 ++++++++++++++++++++++++++++++++++++++ include/uapi/linux/vhost.h | 4 ++++ 2 files changed, 53 insertions(+)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index fb590e346e43..425850d1c2c7 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -567,6 +567,47 @@ static long vhost_vdpa_resume(struct vhost_vdpa *v) return ops->resume(vdpa); }
+static long vhost_vdpa_set_log_base(struct vhost_vdpa *v, u64 __user *argp) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u64 log; + + if (!ops->set_log_base) + return -EOPNOTSUPP; + + if (copy_from_user(&log, argp, sizeof(uint64_t))) + return -EFAULT; + + return ops->set_log_base(vdpa, log); +} + +static long vhost_vdpa_set_log_size(struct vhost_vdpa *v, u64 __user *sizep) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u64 log_size; + + if (!ops->set_log_size) + return -EOPNOTSUPP; + + if (copy_from_user(&log_size, sizep, sizeof(log_size))) + return -EFAULT; + + return ops->set_log_size(vdpa, log_size); +} + +static long vhost_vdpa_log_sync(struct vhost_vdpa *v) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + + if (!ops->log_sync) + return -EOPNOTSUPP; + + return ops->log_sync(vdpa); +} + static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, void __user *argp) { @@ -741,6 +782,14 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, r = -EFAULT; break; case VHOST_SET_LOG_BASE: + r = vhost_vdpa_set_log_base(v, argp); + break; + case VHOST_SET_LOG_SIZE: + r = vhost_vdpa_set_log_size(v, argp); + break; + case VHOST_LOG_SYNC: + r = vhost_vdpa_log_sync(v); + break; case VHOST_SET_LOG_FD: r = -ENOIOCTLCMD; break; diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index f5c48b61ab62..ce9d187432d1 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -43,6 +43,10 @@ * The bit is set using an atomic 32 bit operation. */ /* Set base address for logging. */ #define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64) +/* Set buffer size for logging */ +#define VHOST_SET_LOG_SIZE _IOW(VHOST_VIRTIO, 0x05, __u64) +/* Synchronize logging buffer from kernel space to user space */ +#define VHOST_LOG_SYNC _IO(VHOST_VIRTIO, 0x06) /* Specify an eventfd file descriptor to signal on log write. */ #define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int) /* By default, a device gets one vhost_worker that its virtqueues share. This