Errata
Intel
®
Core™2 Extreme Quad-Core Processor QX6000
Δ
Sequence and 65
Intel
®
Core™2 Quad Processor Q6000
Δ
Sequence
Specification Update
Workaround: Software should not set bit 7 in any PML4E or PDPTE that has Present Bit (Bit
0) set to “1”.
Status: For the steppings affected, see the Summary Tables of Changes.
AK126. Not-Present Page Faults May Set the RSVD Flag in the Error Code
Problem: An attempt to access a page that is not marked present causes a page
fault. Such a page fault delivers an error code in which both the P flag (bit 0)
and the RSVD flag (bit 3) are 0. Due to this erratum, not-present page faults
may deliver an error code in which the P flag is 0 but the RSVD flag is 1.
Implication: Software may erroneously infer that a page fault was due to a reserved-bit
violation when it was actually due to an attempt to access a not-present
page. Intel has not observed this erratum with any commercially available
software.
Workaround: Page-fault handlers should ignore the RSVD flag in the error code if the P flag
is 0.
Status: For the steppings affected, see the Summary Tables of Changes.
AK127. VM Exits Due to “NMI-Window Exiting” May Be Delayed by One
Instruction
Problem: If VM entry is executed with the “NMI-window exiting” VM-execution control set to 1, a
VM exit with exit reason “NMI window” should occur before execution of any instruction if
there is no virtual-NMI blocking, no blocking of events by MOV SS, and no blocking of
events by STI. If VM entry is made with no virtual-NMI blocking but with blocking of
events by either MOV SS or STI, such a VM exit should occur after execution of one
instruction in VMX non-root operation. Due to this erratum, the VM exit may be delayed
by one additional instruction.
Implication: VMM software using “NMI-window exiting” for NMI virtualization should generally be
unaffected, as the erratum causes at most a one-instruction delay in the injection of a
virtual NMI, which is virtually asynchronous. The erratum may affect VMMs relying on
deterministic delivery of the affected VM exits.
Workaround: None identified.
Status: For the steppings affected, see the Summary Tables of Changes.
AK128. FP Data Operand Pointer May Be Incorrectly Calculated After an FP
Access Which Wraps a 4-Gbyte Boundary in Code That Uses 32-Bit
Address Size in 64-bit Mode
Problem: The FP (Floating Point) Data Operand Pointer is the effective address of the operand
associated with the last non-control FP instruction executed by the processor. If an 80-bit
FP access (load or store) uses a 32-bit address size in 64-bit mode and the memory
access wraps a 4-Gbyte boundary and the FP environment is subsequently saved, the
value contained in the FP Data Operand Pointer may be incorrect.
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