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spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60710 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hsRSr-000241-Kv for qemu-devel@archiver.kernel.org; Tue, 30 Jul 2019 08:42:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37827) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hsRRv-0001EU-Cg for qemu-devel@nongnu.org; Tue, 30 Jul 2019 08:41:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hsRRu-0008BS-5J for qemu-devel@nongnu.org; Tue, 30 Jul 2019 08:41:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35798) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hsRRt-00088Q-DT for qemu-devel@nongnu.org; Tue, 30 Jul 2019 08:41:49 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 219788553F; Tue, 30 Jul 2019 12:41:48 +0000 (UTC) Received: from work-vm (ovpn-117-45.ams2.redhat.com [10.36.117.45]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E7A2619C5B; Tue, 30 Jul 2019 12:41:43 +0000 (UTC) Date: Tue, 30 Jul 2019 13:41:41 +0100 From: "Dr. David Alan Gilbert" To: Igor Mammedov Message-ID: <20190730124141.GD2678@work-vm> References: <20190730093719.12958-1-dgilbert@redhat.com> <20190730093719.12958-2-dgilbert@redhat.com> <20190730122545.7c08dd58@Igors-MacBook-Pro> <20190730111306.GC2678@work-vm> <20190730140325.3e8a02df@Igors-MacBook-Pro> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190730140325.3e8a02df@Igors-MacBook-Pro> User-Agent: Mutt/1.12.0 (2019-05-25) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Tue, 30 Jul 2019 12:41:48 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH 1/2] pcie_root_port: Allow ACS to be disabled X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, quintela@redhat.com, qemu-devel@nongnu.org, ehabkost@redhat.com, mst@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Igor Mammedov (imammedo@redhat.com) wrote: > On Tue, 30 Jul 2019 12:13:06 +0100 > "Dr. David Alan Gilbert" wrote: > > > * Igor Mammedov (imammedo@redhat.com) wrote: > > > On Tue, 30 Jul 2019 10:37:18 +0100 > > > "Dr. David Alan Gilbert (git)" wrote: > > > > > > > From: "Dr. David Alan Gilbert" > > > > > > > > ACS was added in 4.0 unconditionally, this breaks migration > > > > compatibility. > > > > Allow ACS to be disabled by adding a property that's > > > > checked by pcie_root_port. > > > > > > > > Unfortunately pcie-root-port doesn't have any instance data, > > > > so there's no where for that flag to live, so stuff it into > > > > PCIESlot. > > > > > > > > Signed-off-by: Dr. David Alan Gilbert > > > > --- > > > > hw/pci-bridge/pcie_root_port.c | 3 ++- > > > > include/hw/pci/pcie_port.h | 2 ++ > > > > 2 files changed, 4 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/hw/pci-bridge/pcie_root_port.c b/hw/pci-bridge/pcie_root_port.c > > > > index 09019ca05d..1d8a778709 100644 > > > > --- a/hw/pci-bridge/pcie_root_port.c > > > > +++ b/hw/pci-bridge/pcie_root_port.c > > > > @@ -111,7 +111,7 @@ static void rp_realize(PCIDevice *d, Error **errp) > > > > pcie_aer_root_init(d); > > > > rp_aer_vector_update(d); > > > > > > > > - if (rpc->acs_offset) { > > > > + if (rpc->acs_offset && !s->disable_acs) { > > > > > > it's not like it would be used per instance, > > > so could we use class property and with rpc->disable_acs instead of PCIESlot? > > > > I'm not clear I understand how class properties help; > > object_class_property_add_bool > > takes a getter/setter that takes an Object * parameter; > > my reading of that is that it's the instance data so has the same > > problem. > > it's possible to reach class data from setter/getter, > for example s390_cpu_model_class_register_props(). Ah OK. > But it will be a bit more code than here and considering > that it's only field in parent type which is reachable through > root port specific property only it is also ok as is as a > fix to 4.1, so if you prefer to keep it like now > > Reviewed-by: Igor Mammedov Thanks! > > > > Dave > > > > > > pcie_acs_init(d, rpc->acs_offset); > > > > } > > > > return; > > > > @@ -145,6 +145,7 @@ static void rp_exit(PCIDevice *d) > > > > static Property rp_props[] = { > > > > DEFINE_PROP_BIT(COMPAT_PROP_PCP, PCIDevice, cap_present, > > > > QEMU_PCIE_SLTCAP_PCP_BITNR, true), > > > > + DEFINE_PROP_BOOL("disable-acs", PCIESlot, disable_acs, false), > > > > DEFINE_PROP_END_OF_LIST() > > > > }; > > > > > > > > diff --git a/include/hw/pci/pcie_port.h b/include/hw/pci/pcie_port.h > > > > index 09586f4641..7515430087 100644 > > > > --- a/include/hw/pci/pcie_port.h > > > > +++ b/include/hw/pci/pcie_port.h > > > > @@ -53,6 +53,8 @@ struct PCIESlot { > > > > PCIExpLinkSpeed speed; > > > > PCIExpLinkWidth width; > > > > > > > > + /* Disable ACS (really for a pcie_root_port) */ > > > > + bool disable_acs; > > > > QLIST_ENTRY(PCIESlot) next; > > > > }; > > > > > > > > > -- > > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK