Hi Roger, I've got two immediate thoughts:
On 9 January 2013 00:46, Roger Pau Monné <[email protected]> wrote: > This device works by passing a memory region previously allocated with > mmap(NULL, size, prot, MAP_ANON | MAP_SHARED, -1, 0). This region is i) wire down the mapping with MAP_WIRED This will prevent it from being paged in/out and thus pagefaulting on access. ... > So far I've been able to get the ptes, pass them to Xen and stablish the > mapping. Writing to that memory area from userspace seems to work fine > (using pread), but the problem comes when the userspace program executes > something like: > > pwrite(fd, buf,...) ii) If this is a xen specific page aliasing issue (where a writeable page is disallowed because it points to RO pagetables mappings of domains), perhaps that's nothing to do with UVM ? Cheers, -- ~Cherry
