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SubjectRe: [PATCH 00/11] VMBus channel interrupt reassignment
On Mon, Apr 06, 2020 at 02:15:03AM +0200, Andrea Parri (Microsoft) wrote:
> Hi all,
>
> This is a follow-up on the RFC submission [1]. The series introduces
> changes in the VMBus drivers to reassign the CPU that a VMbus channel
> will interrupt. This feature can be used for load balancing or other
> purposes (e.g. CPU offlining). The submission integrates feedback in
> the RFC to amend the handling of the 'array of channels' (patch #3).
>
> Thanks,
> Andrea
>
> [1] https://lkml.kernel.org/r/20200325225505.23998-1-parri.andrea@gmail.com
>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Andrew Murray <amurray@thegoodpenguin.co.uk>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
>
> Andrea Parri (Microsoft) (11):
> Drivers: hv: vmbus: Always handle the VMBus messages on CPU0
> Drivers: hv: vmbus: Don't bind the offer&rescind works to a specific
> CPU
> Drivers: hv: vmbus: Replace the per-CPU channel lists with a global
> array of channels
> hv_netvsc: Disable NAPI before closing the VMBus channel
> hv_utils: Always execute the fcopy and vss callbacks in a tasklet
> Drivers: hv: vmbus: Use a spin lock for synchronizing channel
> scheduling vs. channel removal
> PCI: hv: Prepare hv_compose_msi_msg() for the
> VMBus-channel-interrupt-to-vCPU reassignment functionality
> Drivers: hv: vmbus: Remove the unused HV_LOCALIZED channel affinity
> logic
> Drivers: hv: vmbus: Synchronize init_vp_index() vs. CPU hotplug
> Drivers: hv: vmbus: Introduce the CHANNELMSG_MODIFYCHANNEL message
> type
> scsi: storvsc: Re-init stor_chns when a channel interrupt is
> re-assigned
>

Applied to hyperv-next. Thanks.

This hunk in patch 10 doesn't apply cleanly because it conflicts with
Vitaly's patch.

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 3785beead503d..1058c814ab06e 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -1377,7 +1377,7 @@ channel_message_table[CHANNELMSG_COUNT] = {
{ CHANNELMSG_19, 0, NULL },
{ CHANNELMSG_20, 0, NULL },
{ CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL },
- { CHANNELMSG_22, 0, NULL },
+ { CHANNELMSG_MODIFYCHANNEL, 0, NULL },
{ CHANNELMSG_TL_CONNECT_RESULT, 0, NULL },
};

I have fixed it up. New hunk looks like:
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index a6b21838e2de..9c62eb5e4135 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -1380,7 +1380,7 @@ channel_message_table[CHANNELMSG_COUNT] = {
{ CHANNELMSG_19, 0, NULL, 0},
{ CHANNELMSG_20, 0, NULL, 0},
{ CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL, 0},
- { CHANNELMSG_22, 0, NULL, 0},
+ { CHANNELMSG_MODIFYCHANNEL, 0, NULL, 0},
{ CHANNELMSG_TL_CONNECT_RESULT, 0, NULL, 0},
};

Let me know if I messed it up.
Wei.

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