linux-kernel - Re: [PATCH v10 05/16] x86/virt/tdx: Add skeleton to enable TDX on demand

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Message-ID: <dfc6dd51ee07f75fedb5d0ee99402a33168954ae.camel@intel.com>
Date:   Thu, 16 Mar 2023 02:52:23 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "david@...hat.com" <david@...hat.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>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shahar, Sagi" <sagis@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "Gao, Chao" <chao.gao@...el.com>,
        "Brown, Len" <len.brown@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: [PATCH v10 05/16] x86/virt/tdx: Add skeleton to enable TDX on
 demand


> >  
> > @@ -356,7 +357,7 @@ static int try_init_module_global(void)
> >  	 * The TDX module global initialization only needs to be done
> >  	 * once on any cpu.
> >  	 */
> > -	spin_lock(&tdx_global_init_lock);
> > +	raw_spin_lock_irqsave(&tdx_global_init_lock, flags);
> 
> As hardware_enable_all() uses cpus_read_lock(), irqsave isn't needed.
> this line should be raw_spin_lock().
> 

OK.  I missed that in PREEMPT_RT kernel the spinlock is converted to sleeping
lock.  So I'll change to use raw_spin_lock() as we talked.  Thanks.