linux-kernel - RE: [PATCH v3 2/4] KVM: x86: Use vector-hashing to deliver lowest-priority interrupts

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Message-ID: <E959C4978C3B6342920538CF579893F00C2BCE0A@SHSMSX104.ccr.corp.intel.com>
Date:	Thu, 21 Jan 2016 06:02:59 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Yang Zhang <yang.zhang.wz@...il.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"rkrcmar@...hat.com" <rkrcmar@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [PATCH v3 2/4] KVM: x86: Use vector-hashing to deliver
 lowest-priority interrupts



> -----Original Message-----
> From: Yang Zhang [mailto:yang.zhang.wz@...il.com]
> Sent: Thursday, January 21, 2016 1:58 PM
> To: Wu, Feng <feng.wu@...el.com>; pbonzini@...hat.com;
> rkrcmar@...hat.com
> Cc: linux-kernel@...r.kernel.org; kvm@...r.kernel.org
> Subject: Re: [PATCH v3 2/4] KVM: x86: Use vector-hashing to deliver lowest-
> priority interrupts
> 
> >>
> >> I remember we have discussed that even the LAPIC is software disabled,
> >> it still can respond to some interrupts like INIT, NMI, SMI, and SIPI
> >> messages. Isn't current logic still problematically?
> >
> > I don't think there are problems, here we only cover lowest-priority mode.
> 
> Does Intel SDM said those interrupts cannot be delivered on
> lowest-priority mode?

Fixed, Lowest-priority, SMI, NMI, INIT are all "Delivery Mode", once it is
Lowest-priority, it cannot be other type, afaik.

Thanks,
Feng

> 
> CC Jun.
> 
> Hi Jun,
> 
> Do you know whether INIT, NMI, SMI, and SIPI can be delivered through
> lowest-priority mode? I didn't find SDM says no.
> 
> --
> best regards
> yang