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Hi, Attached patch implements the VMCB cleanbits SVM feature. Upcoming AMD CPUs introduce them and they are basically hints for the CPU which vmcb values can be re-used from the previous VMRUN instruction. Each bit represents a certain set of fields in the VMCB. Setting a bit tells the cpu it can re-use the cached value from the previous VMRUN. Clearing a bit tells the cpu to reload the values

Hi all, I am trying to perform single-stepping and instruction emulation both in Xen-3.2.1. I am using the following approach: First, I mark a guest page "not present" inside the shadow page table so that I could intercept any operation that involves this page. When the guest tries to access that page, it faults and control goes to Xen (sh_page_fault function). There, I emulate that