Hello, While working on XSA-192, I found a curious thing. On AMD hardware, the VMMCALL instruction appears to behave like a nop if executed in VM86 mode. All other processor modes work fine.
The documentation suggests it should be valid in any situation, but I never get a #VMEXIT from it. Thus, I would have thought it would fall into the un-intercepted category and raise a #UD fault, but I don't get that either. Is this behaviour expected? The documentation would certainly seem to indicate not. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
