linux-kernel - Re: [PATCH v13 1/3] x86/tdx: Add TDX Guest attestation interface driver

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Date:   Tue, 13 Sep 2022 05:03:53 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "bp@...en8.de" <bp@...en8.de>
CC:     "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "wander@...hat.com" <wander@...hat.com>,
        "tim.gardner@...onical.com" <tim.gardner@...onical.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "Cox, Philip" <philip.cox@...onical.com>,
        "khalid.elmously@...onical.com" <khalid.elmously@...onical.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v13 1/3] x86/tdx: Add TDX Guest attestation interface
 driver

On Mon, 2022-09-12 at 19:44 -0700, Sathyanarayanan Kuppuswamy wrote:
> 
> On 9/12/22 6:25 PM, Huang, Kai wrote:
> > > diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
> > > index 928dcf7a20d9..8b5c59110321 100644
> > > --- a/arch/x86/coco/tdx/tdx.c
> > > +++ b/arch/x86/coco/tdx/tdx.c
> > > @@ -5,16 +5,21 @@
> > >  #define pr_fmt(fmt)     "tdx: " fmt
> > >  
> > >  #include <linux/cpufeature.h>
> > > +#include <linux/miscdevice.h>
> > > +#include <linux/mm.h>
> > > +#include <linux/io.h>
> > Sorry perhaps I am missing something, but what is the reason to include
> > <linux/mm.h>?
> 
> It is included for kmalloc/kfree, file related structs and copy_{from|to}_user().
> 
> > 
> > <linux/io.h> is for virt_to_phys()?
> 
> Yes
> 
> > 
> > And should we explicitly include <linux/uaccess.h> for copy_{from|to}_user(),
> 
> mm.h covers it. So I don't think we should explicitly include it.
> 
> > and include the header (<linux/string.h> ?) for memchr_inv()?
> 
> One of the previous headers includes linux/string.h (I am not sure which one).
> So why include it explicitly?
> 

OK.

-- 
Thanks,
-Kai