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 FjVcETp1 K+/Ez2mwx6gZ00oo5/HusVyh2Y8sW5uZa0MpkGILiGcONISROhH/agXWeGVe+J4rkEgYMVKuhVbd93RDTl9eowE/p8Hq9FxifXwIve4k6PP7irBy21q/8xRfeqv89qqAPlQgL9A3mUkrrn1PwYxwD+uTnDd0UjjxFYhpMG5AzP/i3HhQi9V1nNxlaUFeCYos35oQVJCRVHtk2Wavt+wVTfvLZwop3f8nEjk2FtqYYKHy3CQ5FDhijCPQK3tbLg9QmTy18ZUFDkSw9KSP3jJW6mw34KmWcd0NmPNSW6DHGcWQMgphS8JGgtYtjuORtOcFST3bA/f2HvwaTV54oH1LHlVfBJxbSKZW9T53FnBSSZ/RP011t98pk5UBfe8cC8fPEC+JiI2FsdSiSPvCbHF8FhRed91f6f3sgqEasYGDQxQ76IQhRmIrA7DHcBLsyHrsqIatH0Np4THFXFKDG6pXF3SSScg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, On 29/11/25 05:36, Matthew Brost wrote: > On Fri, Nov 28, 2025 at 03:41:41PM +1100, Jordan Niethe wrote: >> A future change will remove device private pages from the physical >> address space. This will mean that device private pages no longer have >> normal PFN and must be handled separately. >> >> Prepare for this by adding a HMM_PFN_DEVICE_PRIVATE flag to indicate >> that a hmm_pfn contains a PFN for a device private page. >> >> Signed-off-by: Jordan Niethe >> Signed-off-by: Alistair Popple >> --- >> include/linux/hmm.h | 2 ++ >> mm/hmm.c | 2 +- >> 2 files changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/include/linux/hmm.h b/include/linux/hmm.h >> index db75ffc949a7..df571fa75a44 100644 >> --- a/include/linux/hmm.h >> +++ b/include/linux/hmm.h >> @@ -23,6 +23,7 @@ struct mmu_interval_notifier; >> * HMM_PFN_WRITE - if the page memory can be written to (requires HMM_PFN_VALID) >> * HMM_PFN_ERROR - accessing the pfn is impossible and the device should >> * fail. ie poisoned memory, special pages, no vma, etc >> + * HMM_PFN_DEVICE_PRIVATE - the pfn field contains a DEVICE_PRIVATE pfn. >> * HMM_PFN_P2PDMA - P2P page >> * HMM_PFN_P2PDMA_BUS - Bus mapped P2P transfer >> * HMM_PFN_DMA_MAPPED - Flag preserved on input-to-output transformation >> @@ -40,6 +41,7 @@ enum hmm_pfn_flags { >> HMM_PFN_VALID = 1UL << (BITS_PER_LONG - 1), >> HMM_PFN_WRITE = 1UL << (BITS_PER_LONG - 2), >> HMM_PFN_ERROR = 1UL << (BITS_PER_LONG - 3), >> + HMM_PFN_DEVICE_PRIVATE = 1UL << (BITS_PER_LONG - 7), >> /* >> * Sticky flags, carried from input to output, >> * don't forget to update HMM_PFN_INOUT_FLAGS >> diff --git a/mm/hmm.c b/mm/hmm.c >> index 87562914670a..1cff68ade1d4 100644 >> --- a/mm/hmm.c >> +++ b/mm/hmm.c >> @@ -262,7 +262,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, >> if (is_device_private_entry(entry) && >> page_pgmap(pfn_swap_entry_to_page(entry))->owner == >> range->dev_private_owner) { >> - cpu_flags = HMM_PFN_VALID; >> + cpu_flags = HMM_PFN_VALID | HMM_PFN_DEVICE_PRIVATE; > > I think you’ll need to set this flag in hmm_vma_handle_absent_pmd as > well. That function handles 2M device pages. Support for 2M device > pages, I believe, will be included in the 6.19 PR, but > hmm_vma_handle_absent_pmd is already upstream. Thanks Matt, I agree. There will be a few more updates to this series for 2MB device pages - I'll send the next revision on top of that support. Jordan. > > Matt > >> if (is_writable_device_private_entry(entry)) >> cpu_flags |= HMM_PFN_WRITE; >> new_pfn_flags = swp_offset_pfn(entry) | cpu_flags; >> -- >> 2.34.1 >>