Intel 925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU Specification page 23

Errata
AA20. A VM Exit due to SMI or INIT in Parallel with a Pending FP Exception
May Not Correctly Clear the Interruptibility State Bits
When a pending FP exception is ready to be taken, a VM exit due to SMI or
Problem:
INIT may not clear Blocking by STI and/or Blocking by MOV SS bits correctly
in Virtual-Machine Control Structure (VMCS) as expected..
Implication: A VM exit due to SMI or INIT may show incorrect STI and/or MOV SS blocking
state in VM-exit Interruptibility field.
Workaround: It is possible for the BIOS to contain a workaround for this erratum. .
For the steppings affected, see the Summary Tables of Changes.
Status:
AA21. Processor May Hang with a 25% or Less STPCLK# Duty Cycle
If a system de-asserts STPCLK# at a 25% or less duty cycle and the
Problem:
processor thermal control circuit (TCC) on-demand clock modulation is active,
the processor may hang. This erratum does not occur under the automatic
mode of the TCC.
Implication: When this erratum occurs, the processor may hang.
Workaround: If use of the on-demand mode of the processor's TCC is desired in
conjunction with STPCLK# modulation, then assure that STPCLK# is not
asserted at a 25% duty cycle.
For the steppings affected, see the Summary Tables of Changes.
Status:
AA22. Attempting to Use an LDT Entry when the LDTR Has Been Loaded
with an Unusable Segment May Cause Unexpected Memory Accesses
In a system supporting Intel
Problem:
may incorrectly VM exit under the following conditions:
1. Interrupt-Window-Exiting VM-execution control is set
2. RFLAGS[IF]=1
3. Chipwide Powerdown transition requests occur when the processor is in
Wait-For-SIPI or Shutdown states
Implication: Due to this erratum, Interrupt-Window-Exiting VM exits may take the logical
processor out of Wait-For-SIPI and Shutdown states. Intel has not observed
this erratum with any commercially available software.
Workaround: It is possible for the BIOS to contain a workaround for this erratum
For the steppings affected, see the Summary Tables of Changes.
Status:
Specification Update
®
Virtualization Technology, the processor
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