search for: page_io

Hi guys, During my refresh to latest linux, I noticed, direct mapping of all non-RAM pages in xen_set_identity_and_release(). I currently don''t map all at front, but as needed looking at the PAGE_IO bit in the pte. One result of that is minor change to common code macro: __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) to to __set_fixmap(idx, phys, PAGE_KERNEL_IO_NOCACHE) To avoid this change, and keep all my changes limited to xen files only, I thought I could just map the entir...

Hi, On paravirt x86 (both 32- and 64-bit), since cset 13998: http://xenbits.xensource.com/xen-unstable.hg?rev/13998 we translate all ptes from being mfn-based to pfn-based when the hardware _PAGE_PRESENT bit is cleared. We do this for PROT_NONE pages, which appear to the HV to be non-present, but which are special-cased in the kernel to appear present (a different bit in the