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linux/drivers/hv
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Yanming Liu 96d9d1fa5c Drivers: hv: balloon: account for vmbus packet header in max_pkt_size 
Commit adae1e931a ("Drivers: hv: vmbus: Copy packets sent by Hyper-V
out of the ring buffer") introduced a notion of maximum packet size in
vmbus channel and used that size to initialize a buffer holding all
incoming packet along with their vmbus packet header. hv_balloon uses
the default maximum packet size VMBUS_DEFAULT_MAX_PKT_SIZE which matches
its maximum message size, however vmbus_open expects this size to also
include vmbus packet header. This leads to 4096 bytes
dm_unballoon_request messages being truncated to 4080 bytes. When the
driver tries to read next packet it starts from a wrong read_index,
receives garbage and prints a lot of "Unhandled message: type:
<garbage>" in dmesg.

Allocate the buffer with HV_HYP_PAGE_SIZE more bytes to make room for
the header.

Fixes: adae1e931a ("Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer")
Suggested-by: Michael Kelley (LINUX) <mikelley@microsoft.com>
Suggested-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Signed-off-by: Yanming Liu <yanminglr@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20220119202052.3006981-1-yanminglr@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
2022-01-23 22:31:23 +00:00
..
channel_mgmt.c Drivers: hv: vmbus: Initialize request offers message for Isolation VM 2022-01-05 20:39:14 +00:00
channel.c Drivers: hv: vmbus: Initialize VMbus ring buffer for Isolation VM 2021-10-28 11:26:36 +00:00
connection.c Drivers: hv: vmbus: Add SNP support for VMbus channel initiate message 2021-10-28 11:22:55 +00:00
hv_balloon.c Drivers: hv: balloon: account for vmbus packet header in max_pkt_size 2022-01-23 22:31:23 +00:00
hv_common.c Drivers: hv: Fix definition of hypercall input & output arg variables 2021-12-28 14:18:43 +00:00
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_balloon.h
hv_trace.c
hv_trace.h Drivers: hv: vmbus: Drivers: hv: vmbus: Introduce CHANNELMSG_MODIFYCHANNEL_RESPONSE 2021-04-18 13:03:11 +00:00
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 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv_utils_transport.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv.c x86/hyperv: Add ghcb hvcall support for SNP VM 2021-10-28 11:22:49 +00:00
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: Adding NULL pointer check 2021-10-28 11:40:32 +00:00
vmbus_drv.c hyperv-next for 5.17 2022-01-16 15:53:00 +02:00