Re: [PATCH v6 2/6] x86/tdx: Support vmalloc() for tdx_enc_status_changed()

[Dave Hansen]

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?