On 5/8/20 12:51 PM, Christoph Hellwig wrote:
On Fri, May 08, 2020 at 12:20:07PM -0700, Ralph Campbell wrote:
hmm_range_fault() returns an array of page frame numbers and flags for how the pages are mapped in the requested process' page tables. The PFN can be used to get the struct page with hmm_pfn_to_page() and the page size order can be determined with compound_order(page) but if the page is larger than order 0 (PAGE_SIZE), there is no indication that the page is mapped using a larger page size. To be fully general, hmm_range_fault() would need to return the mapping size to handle cases like a 1GB compound page being mapped with 2MB PMD entries. However, the most common case is the mapping size the same as the underlying compound page size. Add a new output flag to indicate this so that callers know it is safe to use a large device page table mapping if one is available.
Why do you need the flag? The caller should be able to just use page_size() (or willys new thp_size helper).
The question is whether or not a large page can be mapped with smaller page table entries with different permissions. If one process has a 2MB page mapped with 4K PTEs with different read/write permissions, I don't think it would be OK for a device to map the whole 2MB with write access enabled. The flag is supposed to indicate that the whole page can be mapped by the device with the indicated read/write permissions.