linux-stable/drivers/hv
Boqun Feng eb35da973c Drivers: hv: balloon: Disable balloon and hot-add accordingly
[ Upstream commit be5802795c ]

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 09:36:22 +02:00
..
channel.c Drivers: hv: vmbus: Initialize VMbus ring buffer for Isolation VM 2021-10-28 11:26:36 +00:00
channel_mgmt.c Drivers: hv: vmbus: Replace smp_store_mb() with virt_store_mb() 2022-04-13 19:27:41 +02:00
connection.c Drivers: hv: vmbus: Add SNP support for VMbus channel initiate message 2021-10-28 11:22:55 +00:00
hv.c x86/hyperv: Add ghcb hvcall support for SNP VM 2021-10-28 11:22:49 +00:00
hv_balloon.c Drivers: hv: balloon: Disable balloon and hot-add accordingly 2022-04-20 09:36:22 +02:00
hv_common.c Drivers: hv: vmbus: Propagate VMbus coherence to each VMbus device 2022-04-20 09:36:20 +02:00
hv_debugfs.c hv_debugfs: Make hv_debug_root static 2020-04-04 17:47:43 +01:00
hv_fcopy.c Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer 2021-05-14 17:37:46 +00:00
hv_kvp.c Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer 2021-05-14 17:37:46 +00:00
hv_snapshot.c hv_utils: Set the maximum packet size for VSS driver to the length of the receive buffer 2021-08-25 19:03:20 +00:00
hv_trace.c hv: add SPDX license to trace 2018-03-28 13:24:56 +02:00
hv_trace.h Drivers: hv: vmbus: Drivers: hv: vmbus: Introduce CHANNELMSG_MODIFYCHANNEL_RESPONSE 2021-04-18 13:03:11 +00:00
hv_trace_balloon.h hv_balloon: trace post_status 2018-03-06 09:57:17 -08:00
hv_util.c drivers: hv: Decouple Hyper-V clock/timer code from VMbus drivers 2021-07-19 09:24:28 +00:00
hv_utils_transport.c Drivers: hv: utils: Make use of the helper macro LIST_HEAD() 2022-02-09 14:33:21 +00:00
hv_utils_transport.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hyperv_vmbus.h hyperv-next for 5.16 2021-11-02 10:56:49 -07:00
Kconfig hv: utils: add PTP_1588_CLOCK to Kconfig to fix build 2021-11-28 21:22:35 +00:00
Makefile Drivers: hv: Move Hyper-V extended capability check to arch neutral code 2021-06-05 10:22:34 +00:00
ring_buffer.c Drivers: hv: vmbus: Prevent load re-ordering when reading ring buffer 2022-04-20 09:36:20 +02:00
vmbus_drv.c Drivers: hv: vmbus: Propagate VMbus coherence to each VMbus device 2022-04-20 09:36:20 +02:00