HV_MESSAGE_HEADER structure
The HV_MESSAGE_HEADER structure describes a message by specifying the message type and information about where the message originated.
Syntax
typedef struct _HV_MESSAGE_HEADER { HV_MESSAGE_TYPE MessageType; UINT8 PayloadSize; HV_MESSAGE_FLAGS MessageFlags; UINT8 Reserved[2]; union { HV_PARTITION_ID Sender; HV_PORT_ID Port; }; } HV_MESSAGE_HEADER, *PHV_MESSAGE_HEADER;
Members
- MessageType
-
A HV_MESSAGE_TYPE value that specifies the type of the message.
- PayloadSize
-
An 8-bit value that specifies the size, in bytes, of the message. A message can be up to HV_MESSAGE_SIZE (256) bytes.
- MessageFlags
-
A HV_MESSAGE_FLAGS union that describes flags that modify the behavior of the message.
- Reserved
-
The 8-bit values in the array that this member consists of are reserved and should be set to zero.
- Sender
-
An HV_PARTITION_ID value that identifies the partition from which the message originated.
- Port
-
An HV_PORT_ID value that identifies the port from which the message originated.
Remarks
SynIC messages have a fixed size and consist of a message header (which includes the message type and information about where the message originated) followed by the message payload. Messages that the hypervisor sends in response to calls to the HvPostMessage function contain the port identifier in the Port member. Intercept messages contain the partition identifier (in the Sender member) of the partition whose virtual processor generated the intercept. Timer intercepts do not contain an origination identifier (that is, the Sender and Port members are specified as zero).
Requirements
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See also
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Build date: 11/16/2013