All, while looking into some of the DEBUG_WX issues I came across aforementioned function and started wondering how pv-ops gets away without the unmapping XenoLinux has always been doing (in free_init_pages()). Inspecting /sys/kernel/debug/kernel_page_tables, I indeed see the area mapped (and even r/w) in both the kernel VA range and the 1:1 mapping. While I could see page table creation code (as being arch specific) to know of this and update both mappings when needed (albeit I can't seem to find respective code), I don't think the balloon driver or code exchanging pages to guarantee address restrictions can be expected to special case this. For my education - what am I overlooking (or is there an actual issue)?
Thanks, Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
