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Boqun Feng c3f86aef97 Drivers: hv: balloon: Disable balloon and hot-add accordingly

[ Upstream commit be5802795cf8d0b881745fa9ba7790293b382280 ]

Currently there are known potential issues for balloon and hot-add on
ARM64:

*	Unballoon requests from Hyper-V should only unballoon ranges
	that are guest page size aligned, otherwise guests cannot handle
	because it's impossible to partially free a page. This is a
	problem when guest page size > 4096 bytes.

*	Memory hot-add requests from Hyper-V should provide the NUMA
	node id of the added ranges or ARM64 should have a functional
	memory_add_physaddr_to_nid(), otherwise the node id is missing
	for add_memory().

These issues require discussions on design and implementation. In the
meanwhile, post_status() is working and essential to guest monitoring.
Therefore instead of disabling the entire hv_balloon driver, the
ballooning (when page size > 4096 bytes) and hot-add are disabled
accordingly for now. Once the issues are fixed, they can be re-enable in
these cases.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20220325023212.1570049-3-boqun.feng@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-04-20 09:34:16 +02:00

channel_mgmt.c

Drivers: hv: vmbus: Replace smp_store_mb() with virt_store_mb()

2022-04-13 20:59:27 +02:00

channel.c

scsi: storvsc: Use blk_mq_unique_tag() to generate requestIDs

2021-05-14 17:39:32 +00:00

connection.c

drivers: hv: Fix missing error code in vmbus_connect()

2021-06-02 15:16:36 +00:00

hv_balloon.c

Drivers: hv: balloon: Disable balloon and hot-add accordingly