From nobody Mon Feb 9 09:34:14 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 150418121703891.26948421192162; Thu, 31 Aug 2017 05:06:57 -0700 (PDT) Received: from localhost ([::1]:55475 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dnOFK-0002MZ-Nt for importer@patchew.org; Thu, 31 Aug 2017 08:06:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37950) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dnODF-0000WG-IZ for qemu-devel@nongnu.org; Thu, 31 Aug 2017 08:04:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dnODB-0004j0-JH for qemu-devel@nongnu.org; Thu, 31 Aug 2017 08:04:45 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:27977 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dnODB-0004iA-7m for qemu-devel@nongnu.org; Thu, 31 Aug 2017 08:04:41 -0400 Received: from localhost (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 31 Aug 2017 20:04:36 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 0F4A04724035; Thu, 31 Aug 2017 20:04:33 +0800 (CST) Received: from localhost.localdomain.localdomain (10.167.226.106) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.319.2; Thu, 31 Aug 2017 20:04:33 +0800 X-IronPort-AV: E=Sophos;i="5.41,453,1498492800"; d="scan'208";a="25057246" From: Dou Liyang To: Date: Thu, 31 Aug 2017 20:04:26 +0800 Message-ID: <1504181068-17822-2-git-send-email-douly.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1504181068-17822-1-git-send-email-douly.fnst@cn.fujitsu.com> References: <1504181068-17822-1-git-send-email-douly.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.106] X-yoursite-MailScanner-ID: 0F4A04724035.ABE9B X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: douly.fnst@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 183.91.158.132 Subject: [Qemu-devel] [PATCH v5 1/3] hw/acpi-build: Fix SRAT memory building in case of node 0 without RAM X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: imammedo@redhat.com, rth@twiddle.net, ehabkost@redhat.com, Dou Liyang , mst@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Eduardo Habkost Currently, Using the fisrt node without memory on the machine makes QEMU unhappy. With this example command line: ... \ -m 1024M,slots=3D4,maxmem=3D32G \ -numa node,nodeid=3D0 \ -numa node,mem=3D1024M,nodeid=3D1 \ -numa node,nodeid=3D2 \ -numa node,nodeid=3D3 \ Guest reports "No NUMA configuration found" and the NUMA topology is wrong. This is because when QEMU builds ACPI SRAT, it regards node 0 as the default node to deal with the memory hole(640K-1M). this means the node0 must have some memory(>1M), but, actually it can have no memory. Fix this problem by cut out the 640K hole in the same way the PCI 4G hole does. Also do some cleanup. Signed-off-by: Eduardo Habkost Signed-off-by: Dou Liyang --- hw/i386/acpi-build.c | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 98dd424..48525a1 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -2318,6 +2318,9 @@ build_tpm2(GArray *table_data, BIOSLinker *linker) (void *)tpm2_ptr, "TPM2", sizeof(*tpm2_ptr), 4, NULL, NUL= L); } =20 +#define HOLE_640K_START (640 * 1024) +#define HOLE_640K_END (1024 * 1024) + static void build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine) { @@ -2373,17 +2376,30 @@ build_srat(GArray *table_data, BIOSLinker *linker, = MachineState *machine) next_base =3D 0; numa_start =3D table_data->len; =20 - numamem =3D acpi_data_push(table_data, sizeof *numamem); - build_srat_memory(numamem, 0, 640 * 1024, 0, MEM_AFFINITY_ENABLED); - next_base =3D 1024 * 1024; for (i =3D 1; i < pcms->numa_nodes + 1; ++i) { mem_base =3D next_base; mem_len =3D pcms->node_mem[i - 1]; - if (i =3D=3D 1) { - mem_len -=3D 1024 * 1024; - } next_base =3D mem_base + mem_len; =20 + /* Cut out the 640K hole */ + if (mem_base <=3D HOLE_640K_START && + next_base > HOLE_640K_START) { + mem_len -=3D next_base - HOLE_640K_START; + if (mem_len > 0) { + numamem =3D acpi_data_push(table_data, sizeof *numamem); + build_srat_memory(numamem, mem_base, mem_len, i - 1, + MEM_AFFINITY_ENABLED); + } + + /* Check for the rare case: 640K < RAM < 1M */ + if (next_base <=3D HOLE_640K_END) { + next_base =3D HOLE_640K_END; + continue; + } + mem_base =3D HOLE_640K_END; + mem_len =3D next_base - HOLE_640K_END; + } + /* Cut out the ACPI_PCI hole */ if (mem_base <=3D pcms->below_4g_mem_size && next_base > pcms->below_4g_mem_size) { @@ -2395,7 +2411,7 @@ build_srat(GArray *table_data, BIOSLinker *linker, Ma= chineState *machine) } mem_base =3D 1ULL << 32; mem_len =3D next_base - pcms->below_4g_mem_size; - next_base +=3D (1ULL << 32) - pcms->below_4g_mem_size; + next_base =3D mem_base + mem_len; } numamem =3D acpi_data_push(table_data, sizeof *numamem); build_srat_memory(numamem, mem_base, mem_len, i - 1, --=20 2.5.5