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 D07E2C25B0C for ; Tue, 9 Aug 2022 14:17:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244329AbiHIORO (ORCPT ); Tue, 9 Aug 2022 10:17:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244408AbiHIORM (ORCPT ); Tue, 9 Aug 2022 10:17:12 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D3B79FD2; Tue, 9 Aug 2022 07:17:10 -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=CeZ/X6P4gkvS+pSvcRdGf4Pv6NOuTiJgaKUXXXsKfEg=; b=eDXPAx3vMSh8lxE3Fvy9e7rvrR jovYabQ4CX6OP4D06YxcZZUrr/ytMYSdyuMxl/gQnftna1BoPVvBTiztwP++MA0E1it9TS+sgfB4g wIPxB2H0aD1at1KNAYZxCcgxV1GHX1r2UL2rUCfFW10AZw1xiuF6IqgZPVMBFFgbGrrSbK5XnENS5 MUZcbqSBlmO6JmE4K6HrN6q/bjJfYMt0daViEgEfEGQrrPInf/zkO4RWPtAe1JHrLKmb6HDMJUo1n CYYlpaF8PnRNwaISATiOmpjnXFi1DAkoBAydr0JDvpXA0S/y0czVLC+r7hIEZfIUWefbSUFElTp9g +w8tZJhQ==; 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 1oLQ2Y-00FRys-Hb; Tue, 09 Aug 2022 14:17:02 +0000 Message-ID: <0b5dcab333906f166fcdbc296373cc5e08bec79f.camel@infradead.org> Subject: Re: [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , 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 15:16:59 +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> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-AMgojG+lkzowwi8UBO8G" 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 --=-AMgojG+lkzowwi8UBO8G Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2022-08-09 at 14:07 +0000, Sean Christopherson wrote: > On Tue, Aug 09, 2022, David Woodhouse wrote: > > On Tue, 2022-08-09 at 14:59 +0200, Paolo Bonzini wrote: > > > On 8/9/22 11:22, David Woodhouse wrote: > > > > On Mon, 2022-08-08 at 14:06 -0500, Coleman Dietsch wrote: > > > > > Stop Xen timer (if it's running) prior to changing the IRQ > > > > > vector and > > > > > potentially (re)starting the timer. Changing the IRQ vector > > > > > while the > > > > > timer is still running can result in KVM injecting a garbage > > > > > event, e.g. > > > > > vm_xen_inject_timer_irqs() could see a non-zero > > > > > xen.timer_pending from > > > > > a previous timer but inject the new xen.timer_virq. > > > >=20 > > > > Hm, wasn't that already addressed in the first patch I saw, > > > > which just > > > > called kvm_xen_stop_timer() unconditionally before (possibly) > > > > setting > > > > it up again? > > >=20 > > > Which patch is that? > >=20 > > The one I acked in > > https://lore.kernel.org/all/9bad724858b6a06c25ead865b2b3d9dfc216d01c.ca= mel@infradead.org/ > >=20 >=20 > It's effectively the same patch. I had asked Coleman to split it into tw= o separate > patches: (1) fix the re-initialization of an active timer bug and (2) sto= p the active > timer before changing the vector (this patch). >=20 But both bugs just require that the timer is stopped first. I preferred the original which was less intrusive, which did just that: case KVM_XEN_VCPU_ATTR_TYPE_TIMER: /* Stop current timer if it is enabled */ if (kvm_xen_timer_enabled(vcpu)) { kvm_xen_stop_timer(vcpu); vcpu->arch.xen.timer_virq =3D 0; } if (data->u.timer.port) { if (data->u.timer.priority !=3D KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL) = { r =3D -EINVAL; break; } vcpu->arch.xen.timer_virq =3D data->u.timer.port; kvm_xen_init_timer(vcpu); /* Restart the timer if it's set */ if (data->u.timer.expires_ns) kvm_xen_start_timer(vcpu, data->u.timer.expires_ns, data->u.timer.expires_ns - get_kvmclock_ns(vcpu->kvm)); } r =3D 0; break; I find the new version a bit harder to follow, with its init-then-stop- then-start logic: case KVM_XEN_VCPU_ATTR_TYPE_TIMER: if (data->u.timer.port && data->u.timer.priority !=3D KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL) { r =3D -EINVAL; break; } if (!vcpu->arch.xen.timer.function) kvm_xen_init_timer(vcpu); /* Stop the timer (if it's running) before changing the vector */ kvm_xen_stop_timer(vcpu); vcpu->arch.xen.timer_virq =3D data->u.timer.port; /* Start the timer if the new value has a valid vector+expiry. */ if (data->u.timer.port && data->u.timer.expires_ns) kvm_xen_start_timer(vcpu, data->u.timer.expires_ns, data->u.timer.expires_ns - get_kvmclock_ns(vcpu->kvm)); r =3D 0; break; But I won't fight you for it.=20 --=-AMgojG+lkzowwi8UBO8G Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD 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