Intel E7-8891 v2 CM8063601377422 Manuel D’Utilisation

Intel

®

 Xeon

® 

Processor E7-2800/4800/8800 v2 Product Family

419

Datasheet Volume Two: Functional Description, February 2014

61:60

RW

0x0

iirg:

IOTLB Invalidation Request Granularity  
When requesting hardware to invalidate the I/OTLB (by setting the 

Intel

®

VT field), software writes the requested invalidation granularity 

through this IIRG field. Following are the encoding for the 2-bit IIRG field.
00: Reserved. Hardware ignores the invalidation request and reports 

invalidation complete by clearing the Intel

®

VT field and reporting 00 in the 

AIG field.
01: Global Invalidation request.
10: Domain-selective invalidation request. The target domain-id must be 

specified in the DID field. 
11: Page-selective invalidation request. The target address, mask and 

invalidation hint must be specified in the Invalidate Address register, the 

domain-id must be provided in the DID field. 

59:59

RV

-

rsz1:

Reserved.

58:57

RO_V

0x0

iaig:

IOTLB Actual Invalidation Granularity  
Hardware reports the granularity at which an invalidation request was 

proceed through the AIG field at the time of reporting invalidation 

completion (by clearing the Intel

®

VT field).The following are the encoding 

for the 2-bit IAIG field.
00: Reserved. This indicates hardware detected an incorrect invalidation 

request and ignored the request. Examples of incorrect invalidation requests 

include detecting an unsupported address mask value in Invalidate Address 

register for page-selective invalidation requests or an 

unsupported/undefined encoding in IIRG.
01: Global Invalidation performed. The processor sets this in response to a 

global IOTLB invalidation request.
10: Domain-selective invalidation performed using the domain-id that was 

specified by software in the DID field. The processor sets this in response to 

a domain selective IOTLB invalidation request.
11:  CPU sets this in response to a page selective invalidation request.

56:50

RV

-

Reserved.

49:49

RW

0x0

dr:

Drain Reads.
CPU uses this to drain or not drain reads on an invalidation request. 

48:48

RW

0x0

dw:

Drain Writes.
CPU uses this to drain or not drain writes on an invalidation request. 

47:32

RW

0x0

did:

Domain ID.
Domain to be invalidated and is programmed by software for both page and 

domain selective invalidation requests. CPU ignores the bits 47:40 since it 

supports only an 8 bit Domain ID.

31:0

RV

-

Reserved.