linux-kernel - Re: [v3 13/26] KVM: Define a new interface kvm_find_dest

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Date:	Tue, 20 Jan 2015 23:04:14 +0200
From:	Nadav Amit <nadav.amit@...il.com>
To:	Radim Kr?má? <rkrcmar@...hat.com>
Cc:	"Wu, Feng" <feng.wu@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"eric.auger@...aro.org" <eric.auger@...aro.org>,
	"gleb@...nel.org" <gleb@...nel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>
Subject: Re: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for VT-d PI

Radim Kr?má? <rkrcmar@...hat.com> wrote:

> 2015-01-14 01:27+0000, Wu, Feng:
>>> the new
>>>> hardware even doesn't consider the TPR for lowest priority interrupts
>>> delivery.
>>> 
>>> A bold move ... what hardware was the first to do so?
>> 
>> I think it was starting with Nehalem.
> 
> Thanks,  (Could be that QPI can't inform about TPR changes anymore ...)
> 
> I played with Linux's TPR on Haswell and found that is has no effect.

Sorry for jumping into the discussion, but doesn’t it depend on
IA32_MISC_ENABLE[23]? This bit disables xTPR messages. On my machine it is
set (probably by the BIOS), but since there is no IA32_MISC_ENABLE is not
locked for changes, the OS can control it.

Nadav--
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