From patchwork Mon Nov 18 10:53:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Vivier X-Patchwork-Id: 11249435 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0CE57184E for ; Mon, 18 Nov 2019 10:57:08 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CDF3520730 for ; Mon, 18 Nov 2019 10:57:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="hcPOfFNB" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CDF3520730 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:60516 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iWeiQ-00060H-Qi for patchwork-qemu-devel@patchwork.kernel.org; Mon, 18 Nov 2019 05:57:06 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:42432) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iWef6-0001bT-II for qemu-devel@nongnu.org; Mon, 18 Nov 2019 05:53:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iWef5-0004RY-9F for qemu-devel@nongnu.org; Mon, 18 Nov 2019 05:53:40 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:21989 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iWef5-0004RM-59 for qemu-devel@nongnu.org; Mon, 18 Nov 2019 05:53:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574074418; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AnX5Bp7pofx0wLQCrap7/m/Bi3qK71qWPkamm5SYI2Q=; b=hcPOfFNBF3LI1qREKLjKG9GwAVi3DobdG0EOLyiNDcpdQEb8kUrvMWdkUe1fT7eJSp8M80 Z0ENuS4IksarKpQY2ViWX0fq9g3dRZo+uZchLe7yyd+qZ5JY8UWaz8B9sV8Wjxu+o6u3be Qk0ZkPrcKJkXRLaWKIT+dSn9Nu9EAE8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-371-xi8x2q9eNPi_H_AgQm4XkQ-1; Mon, 18 Nov 2019 05:53:35 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 52DBA80268B; Mon, 18 Nov 2019 10:53:33 +0000 (UTC) Received: from thinkpad.redhat.com (ovpn-117-32.ams2.redhat.com [10.36.117.32]) by smtp.corp.redhat.com (Postfix) with ESMTP id D702260856; Mon, 18 Nov 2019 10:53:30 +0000 (UTC) From: Laurent Vivier To: qemu-devel@nongnu.org Subject: [PULL v2 4/6] spapr: Add /chosen to FDT only at reset time to preserve kernel and initramdisk Date: Mon, 18 Nov 2019 11:53:17 +0100 Message-Id: <20191118105319.7658-5-lvivier@redhat.com> In-Reply-To: <20191118105319.7658-1-lvivier@redhat.com> References: <20191118105319.7658-1-lvivier@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-MC-Unique: xi8x2q9eNPi_H_AgQm4XkQ-1 X-Mimecast-Spam-Score: 0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 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: Laurent Vivier , Alexey Kardashevskiy , Mark Cave-Ayland , qemu-ppc@nongnu.org, =?utf-8?q?C=C3=A9dric_Le_Goater?= , David Gibson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Alexey Kardashevskiy Since "spapr: Render full FDT on ibm,client-architecture-support" we build the entire flatten device tree (FDT) twice - at the reset time and when "ibm,client-architecture-support" (CAS) is called. The full FDT from CAS is then applied on top of the SLOF internal device tree. This is mostly ok, however there is a case when the QEMU is started with -initrd and for some reason the guest decided to move/unpack the init RAM disk image - the guest correctly notifies SLOF about the change but at CAS it is overridden with the QEMU initial location addresses and the guest may fail to boot if the original initrd memory was changed. This fixes the problem by only adding the /chosen node at the reset time to prevent the original QEMU's linux,initrd-start/linux,initrd-end to override the updated addresses. This only treats /chosen differently as we know there is a special case already and it is unlikely anything else will need to change /chosen at CAS we are better off not touching /chosen after we handed it over to SLOF. Signed-off-by: Alexey Kardashevskiy Message-Id: <20191024041308.5673-1-aik@ozlabs.ru> Signed-off-by: David Gibson Signed-off-by: Laurent Vivier --- hw/ppc/spapr.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 94f9d27096af..e076f6023c73 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -917,7 +917,7 @@ static bool spapr_hotplugged_dev_before_cas(void) return false; } -static void *spapr_build_fdt(SpaprMachineState *spapr); +static void *spapr_build_fdt(SpaprMachineState *spapr, bool reset); int spapr_h_cas_compose_response(SpaprMachineState *spapr, target_ulong addr, target_ulong size, @@ -939,7 +939,7 @@ int spapr_h_cas_compose_response(SpaprMachineState *spapr, size -= sizeof(hdr); - fdt = spapr_build_fdt(spapr); + fdt = spapr_build_fdt(spapr, false); _FDT((fdt_pack(fdt))); if (fdt_totalsize(fdt) + sizeof(hdr) > size) { @@ -1197,7 +1197,7 @@ static void spapr_dt_hypervisor(SpaprMachineState *spapr, void *fdt) } } -static void *spapr_build_fdt(SpaprMachineState *spapr) +static void *spapr_build_fdt(SpaprMachineState *spapr, bool reset) { MachineState *machine = MACHINE(spapr); MachineClass *mc = MACHINE_GET_CLASS(machine); @@ -1297,7 +1297,9 @@ static void *spapr_build_fdt(SpaprMachineState *spapr) spapr_dt_rtas(spapr, fdt); /* /chosen */ - spapr_dt_chosen(spapr, fdt); + if (reset) { + spapr_dt_chosen(spapr, fdt); + } /* /hypervisor */ if (kvm_enabled()) { @@ -1305,11 +1307,14 @@ static void *spapr_build_fdt(SpaprMachineState *spapr) } /* Build memory reserve map */ - if (spapr->kernel_size) { - _FDT((fdt_add_mem_rsv(fdt, KERNEL_LOAD_ADDR, spapr->kernel_size))); - } - if (spapr->initrd_size) { - _FDT((fdt_add_mem_rsv(fdt, spapr->initrd_base, spapr->initrd_size))); + if (reset) { + if (spapr->kernel_size) { + _FDT((fdt_add_mem_rsv(fdt, KERNEL_LOAD_ADDR, spapr->kernel_size))); + } + if (spapr->initrd_size) { + _FDT((fdt_add_mem_rsv(fdt, spapr->initrd_base, + spapr->initrd_size))); + } } /* ibm,client-architecture-support updates */ @@ -1718,7 +1723,7 @@ static void spapr_machine_reset(MachineState *machine) */ fdt_addr = MIN(spapr->rma_size, RTAS_MAX_ADDR) - FDT_MAX_SIZE; - fdt = spapr_build_fdt(spapr); + fdt = spapr_build_fdt(spapr, true); rc = fdt_pack(fdt);