From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [PATCH v6 6/6] KVM: Use eoi to track RTC interrupt delivery status Date: Tue, 26 Mar 2013 15:26:21 +0100 Message-ID: <5151B00D.1050700@redhat.com> References: <1363929845-29005-1-git-send-email-yang.z.zhang@intel.com> <1363929845-29005-7-git-send-email-yang.z.zhang@intel.com> <20130322075047.GN9382@redhat.com> <20130322081441.GP9382@redhat.com> <20130322083045.GQ9382@redhat.com> <20130322084435.GR9382@redhat.com> <20130322085434.GS9382@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "Zhang, Yang Z" , "kvm@vger.kernel.org" , "mtosatti@redhat.com" , "Zhang, Xiantao" To: Gleb Natapov Return-path: Received: from mail-ea0-f171.google.com ([209.85.215.171]:43177 "EHLO mail-ea0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933352Ab3CZO00 (ORCPT ); Tue, 26 Mar 2013 10:26:26 -0400 Received: by mail-ea0-f171.google.com with SMTP id b15so842661eae.30 for ; Tue, 26 Mar 2013 07:26:25 -0700 (PDT) In-Reply-To: <20130322085434.GS9382@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Il 22/03/2013 09:54, Gleb Natapov ha scritto: >>>> > >> >>> > > If userspace does not care about irq status it does not use IRQ_STATUS >>> > > ioctl and we should not go extra mile to provide one. Not everyone cares >>> > > about running Windows as a guest. >> > I see your point. But if no windows guest running, RTC is hardly used by other guests and the overheard can be ignore. >> > > Anyone can use RTC is Linux guest. Don't know about others. I do not think the additional code complexity is worth the speedup. The KVM Userspace That Won't Be Merged doesn't even emulate the RTC interrupt at all. Paolo