From patchwork Wed Feb 2 04:24:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ani Sinha X-Patchwork-Id: 12732614 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 00C71C433F5 for ; Wed, 2 Feb 2022 04:28:51 +0000 (UTC) Received: from localhost ([::1]:42808 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nF7GE-0006G3-Q6 for qemu-devel@archiver.kernel.org; Tue, 01 Feb 2022 23:28:50 -0500 Received: from eggs.gnu.org ([209.51.188.92]:54916) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nF7CD-0003qX-3q for qemu-devel@nongnu.org; Tue, 01 Feb 2022 23:24:41 -0500 Received: from [2607:f8b0:4864:20::1036] (port=43006 helo=mail-pj1-x1036.google.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1nF7CB-0007Lg-1T for qemu-devel@nongnu.org; Tue, 01 Feb 2022 23:24:40 -0500 Received: by mail-pj1-x1036.google.com with SMTP id my12-20020a17090b4c8c00b001b528ba1cd7so4784937pjb.1 for ; Tue, 01 Feb 2022 20:24:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=anisinha-ca.20210112.gappssmtp.com; s=20210112; h=from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=oRJJylaHjQ+ZkM8sCG79PuvEUKlM7vaTCUMFwt6rRS0=; b=Rpm0M9960MK6cxDM9XcVIXRpYVIo9h9hzh66rkzj8ex5H2z5Ce1YMJBVino5EVASkh 6kPfD37jsJye2tOpjQoTVzTNiAPAVXtXR8X94kAQJ/EHBR+c7EsTZX4AOBQd9QV1UBLG q5BbvmjpPRb3owzThsjVeZlLbxdM1BA/hd6TXwVYJBiLSnHLd3dPS4z8RzK8l8vpYsh2 l+SVKmiejaAExRkh3QnK6ciGJKLE6tSW+oQFaWphI4QFRmYUIgQEmhw4emzE2RhHUWjw BTpnJSaePQ91CLkPZUXO5SBEN6O03oGf7JDx5C8WAJeHLJ3DIBFsOjoO5/MQ+R7yZ95k PmLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=oRJJylaHjQ+ZkM8sCG79PuvEUKlM7vaTCUMFwt6rRS0=; b=zl65ma7wklFHMRivhxVyGfW+xjX7jsgC78/YIOxELUxzs/fG/UOpZ2YhCM+Qc2pIcf aoBbRc3GgMJtmqMUBpSRmTcU/pSwa1zspm3afsVGs6/lfGrIi2HK7zvqcQ3Hxvzexja2 VJUssKHLrh8OPj4fxpV4xvrlBgJa/bq6ZEXXThP+DYIip/O86j4TzJyr7kYwlPDQj1VL IMhRopKwRBXfBUlELTLkLP8qa0hTiFRtmk/tuJYMDHPpEaG/btimIYR5MDPsyT7Q96tj S5cl2VF6LS7ra9hJYBXbFPgnlkKJ9kXOefG127N2Dm3cNrr5OAY40h1E/4xcWemQQ+Y/ qKbw== X-Gm-Message-State: AOAM530cWDHfrfJGM/s+pmC3+6DTIFuyRsfyI5A1B7Md0qndPW90xGM4 nX24NcQ4Ht73VgAWRpW7YTe9yWg3GsnbUoip X-Google-Smtp-Source: ABdhPJxg8ceY/oCMzahSuOYLo+/CaJEaezypLUKoaO3Yeb+FgFrg3m+0GEah0qsqx67VSKsNBQK0xA== X-Received: by 2002:a17:902:ea12:: with SMTP id s18mr28315429plg.173.1643775877234; Tue, 01 Feb 2022 20:24:37 -0800 (PST) Received: from anisinha-lenovo.ba.nuagenetworks.net ([115.96.105.196]) by smtp.googlemail.com with ESMTPSA id ga21sm4891832pjb.2.2022.02.01.20.24.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Feb 2022 20:24:36 -0800 (PST) From: Ani Sinha To: qemu-devel@nongnu.org, "Michael S. Tsirkin" , Igor Mammedov , Ani Sinha Subject: [PATCH] hw/smbios: fix memory corruption for large guests due to handle overlap Date: Wed, 2 Feb 2022 09:54:20 +0530 Message-Id: <20220202042420.2115231-1-ani@anisinha.ca> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::1036 (failed) Received-SPF: none client-ip=2607:f8b0:4864:20::1036; envelope-from=ani@anisinha.ca; helo=mail-pj1-x1036.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, PDS_HP_HELO_NORDNS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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" The current implementation of smbios table handle assignment does not leave enough gap between tables 17 and table 19 for guests with larger than 8 TB of memory. This change fixes this issue. This change calculates if additional space between the tables need to be set aside and then reserves that additional space. Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2023977 Signed-off-by: Ani Sinha --- hw/smbios/smbios.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c index 6013df1698..e53e676f2e 100644 --- a/hw/smbios/smbios.c +++ b/hw/smbios/smbios.c @@ -743,13 +743,14 @@ static void smbios_build_type_16_table(unsigned dimm_cnt) #define MAX_T17_STD_SZ 0x7FFF /* (32G - 1M), in Megabytes */ #define MAX_T17_EXT_SZ 0x80000000 /* 2P, in Megabytes */ +#define T17_BASE 0x1100 static void smbios_build_type_17_table(unsigned instance, uint64_t size) { char loc_str[128]; uint64_t size_mb; - SMBIOS_BUILD_TABLE_PRE(17, 0x1100 + instance, true); /* required */ + SMBIOS_BUILD_TABLE_PRE(17, T17_BASE + instance, true); /* required */ t->physical_memory_array_handle = cpu_to_le16(0x1000); /* Type 16 above */ t->memory_error_information_handle = cpu_to_le16(0xFFFE); /* Not provided */ @@ -785,12 +786,15 @@ static void smbios_build_type_17_table(unsigned instance, uint64_t size) SMBIOS_BUILD_TABLE_POST; } -static void smbios_build_type_19_table(unsigned instance, +#define T19_BASE 0x1300 + +static void smbios_build_type_19_table(unsigned instance, unsigned offset, uint64_t start, uint64_t size) { uint64_t end, start_kb, end_kb; - SMBIOS_BUILD_TABLE_PRE(19, 0x1300 + instance, true); /* required */ + SMBIOS_BUILD_TABLE_PRE(19, T19_BASE + \ + offset + instance, true); /* required */ end = start + size - 1; assert(end > start); @@ -982,7 +986,7 @@ void smbios_get_tables(MachineState *ms, uint8_t **anchor, size_t *anchor_len, Error **errp) { - unsigned i, dimm_cnt; + unsigned i, dimm_cnt, offset; if (smbios_legacy) { *tables = *anchor = NULL; @@ -1012,6 +1016,16 @@ void smbios_get_tables(MachineState *ms, dimm_cnt = QEMU_ALIGN_UP(current_machine->ram_size, MAX_DIMM_SZ) / MAX_DIMM_SZ; + /* + * The offset determines if we need to keep additional space betweeen + * table 17 and table 19 so that they do not overlap. For example, + * for a VM with larger than 8 TB guest memory and DIMM size of 16 GiB, + * the default space between the two tables (T19_BASE - T17_BASE = 512) + * is not enough. + */ + offset = (dimm_cnt > (T19_BASE - T17_BASE)) ? \ + dimm_cnt - (T19_BASE - T17_BASE) : 0; + smbios_build_type_16_table(dimm_cnt); for (i = 0; i < dimm_cnt; i++) { @@ -1019,7 +1033,7 @@ void smbios_get_tables(MachineState *ms, } for (i = 0; i < mem_array_size; i++) { - smbios_build_type_19_table(i, mem_array[i].address, + smbios_build_type_19_table(i, offset, mem_array[i].address, mem_array[i].length); }