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From: Eric Farman <farman@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>,
	Matthew Rosato <mjrosato@linux.ibm.com>,
	Halil Pasic <pasic@linux.ibm.com>
Cc: Jared Rossi <jrossi@linux.ibm.com>,
	linux-s390@vger.kernel.org, kvm@vger.kernel.org,
	Eric Farman <farman@linux.ibm.com>
Subject: [RFC PATCH v5 0/3] vfio-ccw: Fix interrupt handling for HALT/CLEAR
Date: Mon, 10 May 2021 22:56:43 +0200	[thread overview]
Message-ID: <20210510205646.1845844-1-farman@linux.ibm.com> (raw)

Hi Conny, Matt, Halil,

Here's the update to my proposed series for handling the collision
between interrupts for START SUBCHANNEL and HALT/CLEAR SUBCHANNEL.
I'm feeling more confident in the state of them now based on the
discussion on v4, so will keep the cover letter brief. :)

I carried patches 1 and 3 from the last version forward, as patch
1 and 2 here. (Thanks, Conny, for the r-b's on them.)

I dropped patches 2 and 4 from the last version, as part of this
newest attempt.  The conversation on patch 4 [1] has formed into
the new patch 3.

As we'd discussed offline last week, I still have the todo for
a more proper audit of the serialization across these codepaths.
But this seems a better, simpler, fix for the code in its current
form, which addresses my problematic test case and does not
impact my usual regression tests. Any further rework for the
serialization [2] will be more invasive, and take a bit longer.

Thanks,
Eric

Changelog:
v4->v5:
 - Applied Conny's r-b to patches 1 and 3
 - Dropped patch 2 and 4
 - Use a "finished" flag in the interrupt completion path

Previous versions:
v4: https://lore.kernel.org/kvm/20210413182410.1396170-1-farman@linux.ibm.com/
v3: https://lore.kernel.org/kvm/20200616195053.99253-1-farman@linux.ibm.com/
v2: https://lore.kernel.org/kvm/20200513142934.28788-1-farman@linux.ibm.com/
v1: https://lore.kernel.org/kvm/20200124145455.51181-1-farman@linux.ibm.com/

References:
[1] https://lore.kernel.org/kvm/2c1c1e73d488673ec39d7c085a343cbd6b50fb41.camel@linux.ibm.com/
[2] https://lore.kernel.org/kvm/20210416164137.23f4631b.cohuck@redhat.com/

Eric Farman (3):
  vfio-ccw: Check initialized flag in cp_init()
  vfio-ccw: Reset FSM state to IDLE inside FSM
  vfio-ccw: Serialize FSM IDLE state with I/O completion

 drivers/s390/cio/vfio_ccw_cp.c  | 4 ++++
 drivers/s390/cio/vfio_ccw_drv.c | 8 +++++---
 drivers/s390/cio/vfio_ccw_fsm.c | 1 +
 drivers/s390/cio/vfio_ccw_ops.c | 2 --
 4 files changed, 10 insertions(+), 5 deletions(-)

-- 
2.25.1


             reply	other threads:[~2021-05-10 20:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-10 20:56 Eric Farman [this message]
2021-05-10 20:56 ` [RFC PATCH v5 1/3] vfio-ccw: Check initialized flag in cp_init() Eric Farman
2021-05-10 20:56 ` [RFC PATCH v5 2/3] vfio-ccw: Reset FSM state to IDLE inside FSM Eric Farman
2021-05-10 20:56 ` [RFC PATCH v5 3/3] vfio-ccw: Serialize FSM IDLE state with I/O completion Eric Farman
2021-05-11 11:31   ` Cornelia Huck
2021-05-11 18:02     ` Eric Farman

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