linux-kernel - Re: [PATCH v10 2/2] x86/tdx: Support vmalloc() for tdx_enc_status

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Date:   Wed, 6 Sep 2023 01:27:35 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "Jason@...c4.com" <Jason@...c4.com>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
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        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "kys@...rosoft.com" <kys@...rosoft.com>,
        "Cui, Dexuan" <decui@...rosoft.com>,
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CC:     "mheslin@...hat.com" <mheslin@...hat.com>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
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Subject: Re: [PATCH v10 2/2] x86/tdx: Support vmalloc() for
 tdx_enc_status_changed()

On Fri, 2023-08-11 at 14:48 -0700, 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.
> 
> Co-developed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>

Acked-by: Kai Huang <kai.huang@...el.com>

One nit below ...

[...]


>  
> -	if (!tdx_map_gpa(start, end, enc))
> +	if (offset_in_page(start) != 0)
>  		return false;

... 	"!= 0" isn't needed.


Or should we even WARN()?  IIUC by reaching here the caller should already
verified both address and size are page aligned, but I didn't do full check.