Errata
Specification Update 25
AA26. At a Bus Ratio of 13:1, RCNT and Address Parity May be Incorrect
Problem: In a system running at the 13:1 bus ratio, RCNT[0] ( ADDR# [28], phase b)
may report incorrect information.
Implication: RCNT[0] may contain incorrect information and cause address parity machine
check errors.
Workaround: Address parity should be disabled and RCNT information should be ignored at
the bus ratio of 13:1.
Status: For the steppings affected, see the Summary Tables of Changes.
AA27. The Execution of a VMPTRLD Instruction May Cause an Unexpected
Memory Access
Problem: In a system supporting Intel
®
Virtualization Technology, executing VMPTRLD
may cause a memory access to an address not referenced by the memory
operand.
Implication: This erratum may cause unpredictable system behavior including system
hang.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the steppings affected, see the Summary Tables of Changes.
AA28. The Execution of VMPTRLD or VMREAD May Cause an Unexpected
Memory Access
Problem: On processors supporting Intel
®
Virtualization Technology, executing a
VMPTRLD or a VMREAD instruction outside of VMX mode may result in a load
to an unexpected address.
Implication: This erratum may cause a load to an unexpected memory address.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the steppings affected, see the Summary Tables of Changes.
AA29. On a “Failed VM-entry” VM Exit, the VMCS Pointer May have Incorrect
Value
Problem: On a “failed VM-entry” VM exit, the VMCS pointer may have incorrect value.
Implication: The value of the VMCS pointer may be incorrect and may result in
unpredictable behavior after the "failed VM-entry”.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the steppings affected, see the Summary Tables of Changes.
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