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Intercepting SMM in Intel-VT VMX-root mode

amazab
Beginner
‎07-28-2009 05:10 PM
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Is there a way to intercept System Management Interrupts (SMI) in Intel-VT root mode?

My initial understanding is that SMI that are issued by H/W directly trap to the SMI handler (that is part of the BIOS) but someone mentioned that Intel-VT can configure the processor to trap all SMIs before they are handled by the BIOS.
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hellfire
New Contributor I
‎07-30-2009 02:54 PM
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Quoting - amazab
Is there a way to intercept System Management Interrupts (SMI) in Intel-VT root mode?

My initial understanding is that SMI that are issued by H/W directly trap to the SMI handler (that is part of the BIOS) but someone mentioned that Intel-VT can configure the processor to trap all SMIs before they are handled by the BIOS.

Yes, SMI-s do cause SMM VM-exits. VMM can properly handle these VM-exits and emulate SMM. See Intel Software Developer Manual, part 3B, section 25.15.2 for details.

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