linux-kernel - RE: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted

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Message-ID: <A9667DDFB95DB7438FA9D7D576C3D87E0AD5D315@SHSMSX104.ccr.corp.intel.com>
Date:	Tue, 4 Aug 2015 07:21:58 +0000
From:	"Zhang, Yang Z" <yang.z.zhang@...el.com>
To:	Paolo Bonzini <pbonzini@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC:	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"srutherford@...el.com" <srutherford@...el.com>,
	"Gudimetla, Giridhar Kumar" <giridhar.kumar.gudimetla@...el.com>
Subject: RE: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted

Paolo Bonzini wrote on 2015-08-04:
> 
> 
> On 04/08/2015 02:46, Zhang, Yang Z wrote:
>>> It is a problem for split irqchip, where the EOI exit bitmap can be
>>> inferred from the IOAPIC routes but the TMR cannot.  The hardware
>>> behavior on the other hand can be implemented purely within the LAPIC.
>> 
>> So updating the TMR within LAPIC is the only solution to handle it?
> 
> It's the simplest and the one that makes most sense.  Considering that
> TMR is a pretty obscure feature, it's unlikely that it will be
> accelerated in the future.

You may be right. It is safe if no future hardware plans to use it. Let me check with our hardware team to see whether it will be used or not in future. 

> 
> Paolo


Best regards,
Yang


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