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

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Message-ID: <SA1PR21MB1335AD4B41015A870797151DBF139@SA1PR21MB1335.namprd21.prod.outlook.com>
Date:   Mon, 28 Nov 2022 01:55:48 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.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>,
        "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>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 5/6] x86/hyperv: Support hypercalls for TDX guests

> From: Sathyanarayanan Kuppuswamy
> <sathyanarayanan.kuppuswamy@...ux.intel.com>
> > +
> > +u64 hv_tdx_hypercall(u64 control, u64 input_addr, u64 output_addr)
> > +{
> > +	struct tdx_hypercall_args args = { };
> 
> I think you mean initialize to 0.
Yes, it's the same as "struct tdx_hypercall_args args = { 0 };"

I was educated to use "{ }", which is said to be more preferred, 
compared to "{ 0 } ":

https://lwn.net/ml/linux-kernel/YG1qF8lULn8lLJa/@unreal/
https://lwn.net/ml/linux-kernel/MW2PR2101MB0892AC106C360F2A209560A8BF759@MW2PR2101MB0892.namprd21.prod.outlook.com/