linux-kernel - Re: [PATCH v14 07/23] x86/virt/tdx: Add skeleton to enable TDX on demand

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Message-ID: <a0389bcb3fa4cd1f02bff94090f302b87d98a2e3.camel@intel.com>
Date:   Wed, 18 Oct 2023 08:29:27 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "nik.borisov@...e.com" <nik.borisov@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "david@...hat.com" <david@...hat.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shahar, Sagi" <sagis@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "Gao, Chao" <chao.gao@...el.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "Brown, Len" <len.brown@...el.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v14 07/23] x86/virt/tdx: Add skeleton to enable TDX on
 demand

 
> > +/*
> > + * Do the module global initialization once and return its result.
> > + * It can be done on any cpu.  It's always called with interrupts
> > + * disabled.
> > + */
> > +static int try_init_module_global(void)
> > +{
> 
> Any particular reason why this function is not called from the tdx 
> module's tdx_init? It's global and must be called once when the module 
> is initialised. Subsequently kvm which is supposed to call 
> tdx_cpu_enable() must be sequenced _after_ tdx which shouldn't be that 
> hard, no? This will eliminate the spinlock as well.
> 

Do you mean early_initcall(tdx_init)?

Because it requires VMXON being done to do SEAMCALL.  For now only KVM does
VMXON.