linux-kernel - RE: [PATCH v2 1/2] KVM: x86: Use vector-hashing to deliver lowest-priority interrupts

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Message-ID: <E959C4978C3B6342920538CF579893F00C2B1248@SHSMSX104.ccr.corp.intel.com>
Date:	Tue, 19 Jan 2016 04:44:20 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krcmár <rkrcmar@...hat.com>
CC:	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [PATCH v2 1/2] KVM: x86: Use vector-hashing to deliver
 lowest-priority interrupts



> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@...hat.com]
> Sent: Monday, January 18, 2016 6:42 PM
> To: Wu, Feng <feng.wu@...el.com>; Radim Krcmár <rkrcmar@...hat.com>
> Cc: kvm@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2 1/2] KVM: x86: Use vector-hashing to deliver lowest-
> priority interrupts
> 
> 
> 
> On 18/01/2016 06:19, Wu, Feng wrote:
> > However,
> > this will make the vector-hashing lowest-priority handling slightly different
> > compare to round-robin, since RR checks "!dst[i]" before injecting the
> > interrupts. What is your opinion about it? Thanks a lot!
> 
> I think Radim's suggestion is fine.  You can print an error (just once
> per guest) to dmesg if the result of the hashing computation corresponds
> to a disabled APIC.

Good idea, is there already a convenient way to do this in KVM?

Thanks,
Feng

> 
> Paolo