Hi, I know that you are very busy but I would really appreciate it if someone could find the time to make sure that I'm the right path.
As an exercise, I'm implementing Page Fusion for Linux guests. I setup my dev environment (with UML) and wrote some code to pull the physical address of each memory area for each process. There is still a lot of work to be done before I merge my stuff to vboxguest, like the following: 1- Ignore the vboxguest module/service: The windows guest additions do this, is it really needed? 2- Filter out pages that are NOT read or execute only. 3- Find out if the code is safe (locking wise) 4- ? Questions: (A) My most important question is what exactly I should be passing down to the hypervisor? The physical address of the pages and their length, correct? So in the case of "/lib/libc-2.11.3.so" below, I would be registering four pages -- 0x37ff3000, 0x38131000, 0x38132000 and 0x38134000 -- each one has a PAGH_SIZE length. (B) For scanning processes, is it safe to just add all the pages for files under /lib /bin /usr and /sbin? (C) Is my attached code accessing vm_area_struct safely? Again, I appreciate any comments/help. My test module populates the list of physical address an output like below. udevd [411] '/lib/libc-2.11.3.so' vm_mm:0x726ee9c mmap_base:0x40000000 vm_start:0x4003b000 vm_end:0x40179000 phy_start:0x37ff3000 phy_end:0x38131000 '/lib/libc-2.11.3.so' vm_mm:0x726ee9c mmap_base:0x40000000 vm_start:0x40179000 vm_end:0x4017a000 phy_start:0x38131000 phy_end:0x38132000 '/lib/libc-2.11.3.so' vm_mm:0x726ee9c mmap_base:0x40000000 vm_start:0x4017a000 vm_end:0x4017c000 phy_start:0x38132000 phy_end:0x38134000 '/lib/libc-2.11.3.so' vm_mm:0x726ee9c mmap_base:0x40000000 vm_start:0x4017c000 vm_end:0x4017d000 phy_start:0x38134000 phy_end:0x38135000 udevd [412] '/lib/libc-2.11.3.so' vm_mm:0x726e2cc mmap_base:0x40000000 vm_start:0x4003b000 vm_end:0x40179000 phy_start:0x37ff3000 phy_end:0x38131000 '/lib/libc-2.11.3.so' vm_mm:0x726e2cc mmap_base:0x40000000 vm_start:0x40179000 vm_end:0x4017a000 phy_start:0x38131000 phy_end:0x38132000 '/lib/libc-2.11.3.so' vm_mm:0x726e2cc mmap_base:0x40000000 vm_start:0x4017a000 vm_end:0x4017c000 phy_start:0x38132000 phy_end:0x38134000 '/lib/libc-2.11.3.so' vm_mm:0x726e2cc mmap_base:0x40000000 vm_start:0x4017c000 vm_end:0x4017d000 phy_start:0x38134000 phy_end:0x38135000 -- -- Ribhi
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