AMD AMD64 Technology Error 400h: VMEXIT_NPF – Meaning, Causes & Fix

Fault code400h

VMEXIT_NPF indicates a host-level page fault occurred during nested paging, with error details in EXITINFO1 and EXITINFO2. The manual lists no action for this code.

Model: AMD AMD64 Technology
Display shows: VMEXIT_NPF (400h)
Type: Fault code
Source: Manual p. 807

Meaning
Common causes
Still not solved
Source

What 400h means

VMEXIT_NPF p. 807

Common causes

Nested paging: host-level page fault occurred (EXITINFO1 contains fault error code; EXITINFO2 contains the guest physical address causing the fault). p. 807

If 400h is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact AMD service.

Open the manual at page 807 All AMD64 Technology error codes Manual details & download

This page summarises what the manufacturer’s manual says about 400h; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with AMD. Found a mistake? Report an error.