Roland McGrath wrote: >> I have to admit I still don't really understand all this. Is it >> documented somewhere? >> > > I have explained it in public more than once, but I don't know off hand > anywhere that was helpfully recorded. > Thanks very much. I'd been poking about, but the closest I came to an actual description was various patches fixing bugs, so it was a little incomplete. > For example, a Xen-enabled kernel can use a single vDSO image (or a single > pair of int80/sysenter images), containing the "nosegneg" hwcap note. When > there is no need for it (native or hvm or 64-bit hv or whatever), it just > clears the mask word. If you actually do this, you'll want to modify the > NOTE_KERNELCAP_BEGIN macro to define a global label you can use with VDSO_SYM. > Thanks for the pointer. I'd been getting a bit of heat for enabling the nonegseg flag unconditionally. If I can make Xen-specific then that will be one less source of complaints. J _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization