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Yanming Liu
96d9d1fa5c
Commitadae1e931a("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) <[email protected]> Suggested-by: Andrea Parri (Microsoft) <[email protected]> Signed-off-by: Yanming Liu <[email protected]> Reviewed-by: Michael Kelley <[email protected]> Reviewed-by: Andrea Parri (Microsoft) <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Wei Liu <[email protected]>