On 5/4/23 15:53, Dexuan Cui wrote: > When a TDX guest runs on Hyper-V, the hv_netvsc driver's netvsc_init_buf() > allocates buffers using vzalloc(), and needs to share the buffers with the > host OS by calling set_memory_decrypted(), which is not working for > vmalloc() yet. Add the support by handling the pages one by one. I think this sets a bad precedent. There are consequences for converting pages between shared and private. Doing it on a vmalloc() mapping is guaranteed to fracture the underlying EPT/SEPT mappings. How does this work with load_unaligned_zeropad()? Couldn't it be running around poking at one of these vmalloc()'d pages via the direct map during a shared->private conversion before the page has been accepted?
