linux-kernel - RE: [PATCH v4 12/12] Drivers: hv: vmbus: Resume after fixing up old primary channels

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Message-ID: <DM5PR21MB0137435EDD570C34C72F0FC3D7B80@DM5PR21MB0137.namprd21.prod.outlook.com>
Date:   Wed, 4 Sep 2019 16:45:17 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Dexuan Cui <decui@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 12/12] Drivers: hv: vmbus: Resume after fixing up old
 primary channels

From: Dexuan Cui <decui@...rosoft.com> Sent: Monday, September 2, 2019 5:23 PM
> 
> When the host re-offers the primary channels upon resume, the host only
> guarantees the Instance GUID  doesn't change, so vmbus_bus_suspend()
> should invalidate channel->offermsg.child_relid and figure out the
> number of primary channels that need to be fixed up upon resume.
> 
> Upon resume, vmbus_onoffer() finds the old channel structs, and maps
> the new offers to the old channels, and fixes up the old structs,
> and finally the resume callbacks of the VSC drivers will re-open
> the channels.
> 
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> ---
>  drivers/hv/channel_mgmt.c | 85 ++++++++++++++++++++++++++++++++++++-----------
>  drivers/hv/connection.c   |  2 ++
>  drivers/hv/hyperv_vmbus.h | 14 ++++++++
>  drivers/hv/vmbus_drv.c    | 17 ++++++++++
>  include/linux/hyperv.h    |  3 ++
>  5 files changed, 101 insertions(+), 20 deletions(-)
> 

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>