From patchwork Tue Sep 10 17:58:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13799181 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id B1C5CEDE9AD for ; Tue, 10 Sep 2024 18:00:00 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1so599-0008Lx-Q0; Tue, 10 Sep 2024 13:59:23 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1so596-00085l-Kq for qemu-devel@nongnu.org; Tue, 10 Sep 2024 13:59:20 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1so594-0006Sj-1D for qemu-devel@nongnu.org; Tue, 10 Sep 2024 13:59:19 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1725991157; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LImbA6gvISjcEBYitgOa52PU03DSH0+RHu7yPYeYS6s=; b=A7x00SQkKB3S5RVnnm+phi69w2UaMD4crV+L+fEn/NCnpycD3OWiMsWTiri7qUUNcBx34w nF9Ysj714BtveCLuE9OR0KRVYTTbiPO1CJyTlRwJ7GGbSkbMR5M074Hbg251KpnD5YAvRw UKhq3wrng+F/ikLnN881fAr7iVTOM9Y= Received: from mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-78-i1OslwssPNqXaN1kR6gVjQ-1; Tue, 10 Sep 2024 13:59:13 -0400 X-MC-Unique: i1OslwssPNqXaN1kR6gVjQ-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E8B5019560B0; Tue, 10 Sep 2024 17:59:11 +0000 (UTC) Received: from t14s.redhat.com (unknown [10.22.32.182]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B704619560AD; Tue, 10 Sep 2024 17:59:07 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Cc: qemu-s390x@nongnu.org, David Hildenbrand , Paolo Bonzini , Thomas Huth , Halil Pasic , Christian Borntraeger , Eric Farman , Richard Henderson , Ilya Leoshkevich , Janosch Frank , "Michael S. Tsirkin" , Cornelia Huck Subject: [PATCH v1 11/14] s390x/s390-virtio-ccw: prepare for memory devices Date: Tue, 10 Sep 2024 19:58:06 +0200 Message-ID: <20240910175809.2135596-12-david@redhat.com> In-Reply-To: <20240910175809.2135596-1-david@redhat.com> References: <20240910175809.2135596-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.145, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Let's prepare our address space for memory devices if enabled via "maxmem" and if we have CONFIG_MEM_DEVICE enabled at all. Note that CONFIG_MEM_DEVICE will be selected automatically once we add support for devices. Just like on other architectures, the region container for memory devices is placed directly above our initial memory. For now, we only align the start address of the region up to 1 GiB, but we won't add any additional space to the region for internal alignment purposes; this can be done in the future if really required. The RAM size returned via SCLP is not modified, as this only covers initial RAM (and standby memory we don't implement) and not memory devices; clarify that in the docs of read_SCP_info(). Existing OSes without support for memory devices will keep working as is, even when memory devices would be attached the VM. Guest OSs which support memory devices, such as virtio-mem, will consult diag500(), to find out the maximum possible pfn. Guest OSes that don't support memory devices, don't have to be changed and will continue relying on information provided by SCLP. There are no remaining maxram_size users in s390x code, and the remaining ram_size users only care about initial RAM: * hw/s390x/ipl.c * hw/s390x/s390-hypercall.c * hw/s390x/sclp.c * target/s390x/kvm/pv.c Signed-off-by: David Hildenbrand --- hw/s390x/s390-virtio-ccw.c | 25 +++++++++++++++++++++++-- hw/s390x/sclp.c | 6 +++++- 2 files changed, 28 insertions(+), 3 deletions(-) diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index 08156f0682..0a9d25620d 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -126,7 +126,7 @@ static void s390_memory_init(MachineState *machine) MemoryRegion *sysmem = get_system_memory(); MemoryRegion *ram = machine->ram; uint64_t ram_size = memory_region_size(ram); - uint64_t hw_limit; + uint64_t hw_limit, devmem_base, devmem_size; int ret; if (!QEMU_IS_ALIGNED(ram_size, 1 * MiB)) { @@ -140,7 +140,21 @@ static void s390_memory_init(MachineState *machine) exit(EXIT_FAILURE); } - ret = s390_set_memory_limit(ram_size, &hw_limit); + devmem_size = 0; + devmem_base = ram_size; +#ifdef CONFIG_MEM_DEVICE + if (machine->ram_size < machine->maxram_size) { + + /* + * Make sure memory devices have a sane default alignment, even + * when weird initial memory sizes are specified. + */ + devmem_base = QEMU_ALIGN_UP(devmem_base, 1 * GiB); + devmem_size = machine->maxram_size - machine->ram_size; + } +#endif + + ret = s390_set_memory_limit(devmem_base + devmem_size, &hw_limit); if (ret == -E2BIG) { error_report("host supports a maximum of %" PRIu64 " GB", hw_limit / GiB); @@ -153,6 +167,13 @@ static void s390_memory_init(MachineState *machine) /* Map the initial memory. Must happen after setting the memory limit. */ memory_region_add_subregion(sysmem, 0, ram); + /* Initialize address space for memory devices. */ +#ifdef CONFIG_MEM_DEVICE + if (devmem_size) { + machine_memory_devices_init(machine, devmem_base, devmem_size); + } +#endif /* CONFIG_MEM_DEVICE */ + /* * Configure the maximum page size. As no memory devices were created * yet, this is the page size of initial memory only. diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c index fac09816bf..fe4216a10d 100644 --- a/hw/s390x/sclp.c +++ b/hw/s390x/sclp.c @@ -162,7 +162,11 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb) read_info->rnsize2 = cpu_to_be32(rnsize); } - /* we don't support standby memory, maxram_size is never exposed */ + /* + * We don't support standby memory. maxram_size is used for sizing the + * memory device region, which is not exposed through SCLP but through + * diag500. + */ rnmax = machine->ram_size >> sclp->increment_size; if (rnmax < 0x10000) { read_info->rnmax = cpu_to_be16(rnmax);