On Wed, Dec 14, 2016 at 8:05 PM, Julien Grall <julien.gr...@arm.com> wrote: >>> Note that ARM does not provide any hardware instruction to translate >>> an IPA (guest physical address) to a PA. So we have a walker there. >>> >>> We also a walk for debugging guest page table (though only when it is >>> using LPAE). I guess it could be re-used in the case where it is not >>> possible to do it in hardware. Although, it would be rewritten to make >>> it safe. >> >> >> This sounds like the kind of thing which would be generally useful, >> although I'd like to understand the problem better before making >> suggestions. > > > memaccess will restrict permission of certain memory regions in stage-2 page > table. For the purpose of the example, lets say read-access as been > restricted. > > One of these memory regions may contain the stage-1 page table. Do you agree > that the guest will not able to read stage-1 page table due the restriction?
But only if the memory is read-protected, right? If a guest PT (stage-1) has read permission but not write permission, the hardware walker should still work, shouldn't it? -George _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
