From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4C91C25B0C for ; Tue, 9 Aug 2022 14:52:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244569AbiHIOwz (ORCPT ); Tue, 9 Aug 2022 10:52:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38842 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243692AbiHIOwy (ORCPT ); Tue, 9 Aug 2022 10:52:54 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A02A710FC5; Tue, 9 Aug 2022 07:52:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=y3kzhnfq6jlkEV9r/gVCrnAcAmbOkI+xyI8m6i9i3qo=; b=If2m8w/WCNLRgr7RYkyWBWGnmF mdx597Er/YTw+IoKXaWcg37yypdIjz8fXwe0BLkonD2ws4jkV38s9MA3Ng/BdgFfDL8UHG5fito2x 5Iy5CaGaux+kixHHFDPnRLserr29lbtv/Lu7Um/jgV5+D4wYmk6C3A2tZ/sPIBCCqBwMOlO70DzmB j7dh3vDKkU5/YkkOqXHQQUvCmf71Pf+YUilnJyz5j9ku8x21xA/1w5Z/Z6ATNXjsCOG2+FbPtyXw6 QiFITu09jdK4f65KbAmFJtkTYx5lnYOb/e+QgNwN6n/EGtX6f8IWH/LUBoB7CPv4W1NT4O76JcJ+O 2ASSiWQA==; Received: from [2001:8b0:10b:1:4a2a:e3ff:fe14:8625] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oLQb9-00FUcM-LG; Tue, 09 Aug 2022 14:52:47 +0000 Message-ID: Subject: Re: [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ From: David Woodhouse To: Sean Christopherson , Paolo Bonzini Cc: Coleman Dietsch , kvm@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, Pavel Skripkin , linux-kernel-mentees@lists.linuxfoundation.org, stable@vger.kernel.org, syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com, metikaya Date: Tue, 09 Aug 2022 15:52:46 +0100 In-Reply-To: References: <20220808190607.323899-2-dietschc@csp.edu> <20220808190607.323899-3-dietschc@csp.edu> <43e258cc-71ac-bde4-d1f8-9eb9519928d3@redhat.com> <4fc1371b83001b4eed1617c37bec6b9d007e45c2.camel@infradead.org> <0b5dcab333906f166fcdbc296373cc5e08bec79f.camel@infradead.org> <953d2e99-ed1a-384d-6d3a-0f656a243f82@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-q1ARj/9cg3Q0PXJvq1PT" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org --=-q1ARj/9cg3Q0PXJvq1PT Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2022-08-09 at 14:40 +0000, Sean Christopherson wrote: > I wanted to separate the "init" from the "stop+start", e.g. if there were= a more > appropriate place for invoking kvm_xen_init_timer() I would have suggeste= d moving > the call outside of KVM_XEN_VCPU_ATTR_TYPE_TIMER entirely. Yeah, there's nowhere sensible that would apply to only Xen guests. I looked at kvm_xen_init_vcpu() but that's unconditional. I do note that we're now calling kvm_xen_init_timer() even when an *unset* timer is being restored after live update/live migration. 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