linux-kernel - [PATCH RFC 0/3] Drivers: hv: utils: re-implement the kernel/userspace communication layer

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Date:	Fri, 27 Feb 2015 17:14:22 +0100
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	devel@...uxdriverproject.org
Cc:	Haiyang Zhang <haiyangz@...rosoft.com>,
	linux-kernel@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-api@...r.kernel.org
Subject: [PATCH RFC 0/3] Drivers: hv: utils: re-implement the kernel/userspace communication layer

This series converts kvp/vss daemons to use misc char devices instead of
netlink for userspace/kernel communication and then updates fcopy to be
consistent with kvp/vss.

Userspace/kernel communication via netlink has a number of issues:
- It is hard for userspace to figure out if the kernel part was loaded or not
  and this fact can change as there is a way to enable/disable the service from
  host side. Racy daemon startup is also a problem.
- When the userspace daemon restarts/dies kernel part doesn't receive a
  notification.
- Netlink communication is not stable under heavy load.
- ...

RFC: I'm a bit puzzled on how to split commits 1 and 2 avoiding breakages.
Commit 3 can definitely be split, however, it is consistent with commits 1 and
2 at this moment and I'm not sure such split will simplify the review.

Vitaly Kuznetsov (3):
  Drivers: hv: kvp: convert userspace/kernel communication to using char
    device
  Drivers: hv: vss: convert userspace/kernel communication to using char
    device
  Drivers: hv: fcopy: make it consistent with vss/kvp

 drivers/hv/hv_fcopy.c       | 395 +++++++++++++++++++++++++------------------
 drivers/hv/hv_kvp.c         | 396 +++++++++++++++++++++++++++-----------------
 drivers/hv/hv_snapshot.c    | 335 +++++++++++++++++++++++++++----------
 include/uapi/linux/hyperv.h |  10 ++
 tools/hv/hv_fcopy_daemon.c  |  48 ++++--
 tools/hv/hv_kvp_daemon.c    | 187 ++++-----------------
 tools/hv/hv_vss_daemon.c    | 141 +++-------------
 7 files changed, 824 insertions(+), 688 deletions(-)

-- 
1.9.3

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