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

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Message-ID: <569CC162.6090207@redhat.com>
Date:	Mon, 18 Jan 2016 11:41:38 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Wu, Feng" <feng.wu@...el.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>
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.

Paolo