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To: "Yao, Jiewen" <jiewen.yao@intel.com>,
 "Kinney, Michael D" <michael.d.kinney@intel.com>,
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 4 Nov 2016 14:50:11 +0100
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 (mx1.redhat.com [10.5.110.28]); Fri, 04 Nov 2016 13:50:16 +0000 (UTC)
Subject: Re: [PATCH 0/6] Enable SMM page level protection.
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On 04/11/2016 14:28, Yao, Jiewen wrote:
> I tried below way. But it does not help too much. It still takes more
> than 1 minutes to boot with SMP=8.
> 
>   SendSmiIpiAllExcludingSelf ();
>   IoWrite8 (ICH9_APM_STS, DataPort    == NULL ? 0 : *DataPort);
>   IoWrite8 (ICH9_APM_CNT, CommandPort == NULL ? 0 : *CommandPort);
> 
> I also tried to reduce the timeout PCD to:
> 
>   gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmApSyncTimeout|1000
> 
> However, I find CPU-2 is still missing.
> 
> Maybe it is caused by QEMU emulate AP in serial mode, not parallel mode.

Yeah, that's possible without KVM.  Do you issue a PAUSE instruction in
the spin loops?  That could help.

Paolo

> I think it might be best choice to set PcdCpuSmmSyncMode|0x1
> 
> It also helps cover a very corner case in SMM. J
>