linux-kernel - Re: [PATCH v12 07/22] x86/virt/tdx: Add skeleton to enable TDX on demand

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Message-ID: <20230628003130.GB3629671@ls.amr.corp.intel.com>
Date:   Tue, 27 Jun 2023 17:31:30 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     "Huang, Kai" <kai.huang@...el.com>
Cc:     "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "david@...hat.com" <david@...hat.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "nik.borisov@...e.com" <nik.borisov@...e.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
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        "Brown, Len" <len.brown@...el.com>,
        "Gao, Chao" <chao.gao@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "x86@...nel.org" <x86@...nel.org>, isaku.yamahata@...il.com
Subject: Re: [PATCH v12 07/22] x86/virt/tdx: Add skeleton to enable TDX on
 demand

On Tue, Jun 27, 2023 at 10:37:58PM +0000,
"Huang, Kai" <kai.huang@...el.com> wrote:

> > > 
> > > +/*
> > > + * Do the module global initialization if not done yet.
> > > + * It's always called with interrupts and preemption disabled.
> > > + */
> > 
> > If interrupts are always disabled why do you need _irqsave()?
> > 
> 
> I'll remove the _irqsave().
> 
> AFAICT Isaku preferred this for additional security, but this is not necessary.

It's because the lockdep complains.  Anyway, it's save to remove _irqsave as
discussed with you.
-- 
Isaku Yamahata <isaku.yamahata@...il.com>