linux-kernel - Re: [PATCH 5/6] x86/hyperv: Support hypercalls for TDX guests

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Date:   Wed, 23 Nov 2022 17:47:14 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "arnd@...db.de" <arnd@...db.de>, "bp@...en8.de" <bp@...en8.de>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "jane.chu@...cle.com" <jane.chu@...cle.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] x86/hyperv: Support hypercalls for TDX guests

On Wed, Nov 23, 2022 at 02:14:58AM +0000, Dexuan Cui wrote:
> > From: Dave Hansen <dave.hansen@...el.com>
> > Sent: Monday, November 21, 2022 12:05 PM
> > [...]
> > >  #ifdef CONFIG_X86_64
> > > +#if CONFIG_INTEL_TDX_GUEST
> > > +	if (hv_isolation_type_tdx()) {
> > 
> > >  #ifdef CONFIG_X86_64
> > > +#if CONFIG_INTEL_TDX_GUEST
> > > +	if (hv_isolation_type_tdx())
> > 
> > >  #ifdef CONFIG_X86_64
> > > +#if CONFIG_INTEL_TDX_GUEST
> > > +	if (hv_isolation_type_tdx())
> > > +		return __tdx_ms_hv_hypercall(control, input2, input1);
> > 
> > See any common patterns there?
> > 
> > The "no #ifdef's in C files" rule would be good to apply here.  Please
> > do one #ifdef in a header.
> 
> Sorry, I should use #ifdef rather than #if. I'll fix it like the below.

No, can we hide preprocessor hell inside hv_isolation_type_tdx()?

Like make it return false for !CONFIG_INTEL_TDX_GUEST and avoid all
#if/#ifdefs in C file.


-- 
  Kiryl Shutsemau / Kirill A. Shutemov