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Thanks, Tom > > On Mon, 27 Jul 2026 at 23:07, Punit Salian wrote: >> >> In confidential computing guest environments (such as AMD SEV-SNP or >> Intel TDX), direct memory access (DAX) mappings between the guest kernel >> and host-backed FUSE/virtiofs shared memory regions must be accessed >> using shared (decrypted) page protections. >> >> Modify fuse_dax_mmap() to apply pgprot_decrypted() to vma->vm_page_prot >> when establishing FUSE DAX memory mappings. This ensures guest page >> table entries for shared DAX buffers are explicitly marked as decrypted, >> preventing memory encryption faults when accessing host-shared DAX memory. >> >> Signed-off-by: Punit Salian >> --- >> fs/fuse/dax.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c >> index a15c464c8d19..00e316a7f805 100644 >> --- a/fs/fuse/dax.c >> +++ b/fs/fuse/dax.c >> @@ -826,6 +826,7 @@ int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma) >> file_accessed(file); >> vma->vm_ops = &fuse_dax_vm_ops; >> vm_flags_set(vma, VM_MIXEDMAP | VM_HUGEPAGE); >> + vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); >> >> return 0; >> } >> -- > > Needs review from someone understanding this technology. > > Thanks, > Miklos