Commit 50a7949b authored by jiangdongxu's avatar jiangdongxu
Browse files

vhost: add VHOST feature VHOST_BACKEND_F_BYTEMAPLOG 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I86ITO



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Introduce new feature bit VHOST_BACKEND_F_BYTEMAPLOG for negotiating the
type of dirty pages.

As some hardware only support bytemap for logging, introduce a new
feature bit. When vhost device starte, negotiating dirty page type used
for logging.

Signed-off-by: default avatarjiangdongxu <jiangdongxu1@huawei.com>
parent 5b45c921

drivers/vhost/vdpa.c

+2 −1
Original line number Diff line number Diff line
@@ -807,7 +807,8 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, 
			return -EFAULT;

		if (features & ~(VHOST_VDPA_BACKEND_FEATURES |

				 BIT_ULL(VHOST_BACKEND_F_SUSPEND) |

				 BIT_ULL(VHOST_BACKEND_F_RESUME)))

				 BIT_ULL(VHOST_BACKEND_F_RESUME) |

				 BIT_ULL(VHOST_BACKEND_F_BYTEMAPLOG)))

			return -EOPNOTSUPP;

		if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) &&

		     !vhost_vdpa_can_suspend(v))

include/uapi/linux/vhost_types.h

+3 −0
Original line number Diff line number Diff line
@@ -182,4 +182,7 @@ enum { 
/* Device can be resumed */

#define VHOST_BACKEND_F_RESUME  0x5



/* Device can use bytemap to deal log */

#define VHOST_BACKEND_F_BYTEMAPLOG  0x3f



#endif