From mboxrd@z Thu Jan 1 00:00:00 1970 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 F13F1C433FE for ; Sat, 5 Nov 2022 17:17:10 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1orMm0-0005zQ-Dy; Sat, 05 Nov 2022 13:16:00 -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 1orMlq-0005vm-8e for qemu-devel@nongnu.org; Sat, 05 Nov 2022 13:15:53 -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 1orMlb-0007Fz-IA for qemu-devel@nongnu.org; Sat, 05 Nov 2022 13:15:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1667668531; 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: in-reply-to:in-reply-to:references:references; bh=B27E8fRCGiwVLH3TSXoyliisL54NW2Z5dtJ5rq2MMJU=; b=dB3j/NxBEIYJznk2BdzpQiWJVCbgMz+Kyh0qsQ98uyD+maUA0P8mYyn0JxvjtP1hSN2bvS R7Nwb+VlgUD705vclX65UWPkSBCBHMMF2XsskyNxspqdQ4B0gFBnRdrjmkKUZrUjqUsLNZ yd+6WzLXogn7otcSv054NRmIiLVhBKY= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-462-Cp5cEzK6NMaM_DpVfzHN4w-1; Sat, 05 Nov 2022 13:15:30 -0400 X-MC-Unique: Cp5cEzK6NMaM_DpVfzHN4w-1 Received: by mail-wm1-f72.google.com with SMTP id 1-20020a05600c028100b003cf7833293cso6004257wmk.3 for ; Sat, 05 Nov 2022 10:15:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=B27E8fRCGiwVLH3TSXoyliisL54NW2Z5dtJ5rq2MMJU=; b=sJMAf1ldlLU5SYrj92tv0w3VQXcupvl0Vo75yv3ufb+lojxU6YcyDEyTFj+5kx/YSS 2zkLb9xXuW+pQ2bSNv6BVi2JOcpbgWLFqMo8N4hWnbUUKXjWFMQ4oMpEe2Sbt5yojtVH UwTr72Z/eBl+4Mb2LQEtoXnFGs9v5LF3BE+dROlLkS6Pc5xrO+wkFquPPp6W2Q3fh63/ GHfJ36CAVA1g9ew4FGsUxaiBHBWQGU4mCpZf71wyB96+B5r1EKr5n2uRwQyKPwBygjaz eA4Ko88IEAnAzyiKt2ehfY6IFinwh89YvQtgAL82f07yyYBiHYKg5zaczvm9nTKe4Quu 05WQ== X-Gm-Message-State: ACrzQf2wROVrdiPlAa8+C2BPsQ8gowvHYADAerrl0RtgfA3WLzH/6Xmn Mlvnmx0a38pOzvd9Y7xB0Xp2QHwZ47eNj5gu+2HiiJOhkSivn5wgcNG6XM2ApQ+SOO7v1rNQtkW IyLA1QbYPwSMSgtdsF3wEiaII26TBYQZnvBeQPzxlTvTztgWDjJSPCA9tXI7l X-Received: by 2002:a5d:5257:0:b0:236:8a38:4e08 with SMTP id k23-20020a5d5257000000b002368a384e08mr25913008wrc.118.1667668529193; Sat, 05 Nov 2022 10:15:29 -0700 (PDT) X-Google-Smtp-Source: AMsMyM7b8FM0zlU/ueSd+kAwbBeca5BVB1a6/1l3Cpq2409c0wpxd6+iLyjfrIRB1sMqkuuPEfd6bQ== X-Received: by 2002:a5d:5257:0:b0:236:8a38:4e08 with SMTP id k23-20020a5d5257000000b002368a384e08mr25912988wrc.118.1667668528800; Sat, 05 Nov 2022 10:15:28 -0700 (PDT) Received: from redhat.com ([2.52.152.137]) by smtp.gmail.com with ESMTPSA id v13-20020adfe28d000000b0022e3538d305sm3049344wri.117.2022.11.05.10.15.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Nov 2022 10:15:28 -0700 (PDT) Date: Sat, 5 Nov 2022 13:15:25 -0400 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Ani Sinha , Gerd Hoffmann , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcel Apfelbaum , Sergio Lopez Subject: [PULL v3 01/81] hw/i386/e820: remove legacy reserved entries for e820 Message-ID: <20221105171116.432921-2-mst@redhat.com> References: <20221105171116.432921-1-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221105171116.432921-1-mst@redhat.com> X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Received-SPF: pass client-ip=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.045, 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_H2=-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: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Ani Sinha e820 reserved entries were used before the dynamic entries with fw config files were intoduced. Please see the following change: 7d67110f2d9a6("pc: add etc/e820 fw_cfg file") Identical support was introduced into seabios as well with the following commit: ce39bd4031820 ("Add support for etc/e820 fw_cfg file") Both the above commits are now quite old. QEMU machines 1.7 and newer no longer use the reserved entries. Seabios uses fw config files and dynamic e820 entries by default and only falls back to using reserved entries when it has to work with old qemu (versions earlier than 1.7). Please see functions qemu_cfg_e820() and qemu_early_e820(). It is safe to remove legacy FW_CFG_E820_TABLE and associated code now as QEMU 7.0 has deprecated i440fx machines 1.7 and older. It would be incredibly rare to run the latest qemu version with a very old version of seabios that did not support fw config files for e820. As far as I could see, edk2/ovfm never supported reserved entries and uses fw config files from the beginning. So there should be no incompatibilities with ovfm as well. CC: Gerd Hoffmann Signed-off-by: Ani Sinha Acked-by: Gerd Hoffmann Message-Id: <20220831045311.33083-1-ani@anisinha.ca> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/i386/e820_memory_layout.h | 8 -------- hw/i386/fw_cfg.h | 1 - hw/i386/e820_memory_layout.c | 20 +------------------- hw/i386/fw_cfg.c | 3 --- hw/i386/microvm.c | 2 -- 5 files changed, 1 insertion(+), 33 deletions(-) diff --git a/hw/i386/e820_memory_layout.h b/hw/i386/e820_memory_layout.h index 04f93780f9..7c239aa033 100644 --- a/hw/i386/e820_memory_layout.h +++ b/hw/i386/e820_memory_layout.h @@ -16,20 +16,12 @@ #define E820_NVS 4 #define E820_UNUSABLE 5 -#define E820_NR_ENTRIES 16 - struct e820_entry { uint64_t address; uint64_t length; uint32_t type; } QEMU_PACKED __attribute((__aligned__(4))); -struct e820_table { - uint32_t count; - struct e820_entry entry[E820_NR_ENTRIES]; -} QEMU_PACKED __attribute((__aligned__(4))); - -extern struct e820_table e820_reserve; extern struct e820_entry *e820_table; int e820_add_entry(uint64_t address, uint64_t length, uint32_t type); diff --git a/hw/i386/fw_cfg.h b/hw/i386/fw_cfg.h index 275f15c1c5..86ca7c1c0c 100644 --- a/hw/i386/fw_cfg.h +++ b/hw/i386/fw_cfg.h @@ -17,7 +17,6 @@ #define FW_CFG_ACPI_TABLES (FW_CFG_ARCH_LOCAL + 0) #define FW_CFG_SMBIOS_ENTRIES (FW_CFG_ARCH_LOCAL + 1) #define FW_CFG_IRQ0_OVERRIDE (FW_CFG_ARCH_LOCAL + 2) -#define FW_CFG_E820_TABLE (FW_CFG_ARCH_LOCAL + 3) #define FW_CFG_HPET (FW_CFG_ARCH_LOCAL + 4) FWCfgState *fw_cfg_arch_create(MachineState *ms, diff --git a/hw/i386/e820_memory_layout.c b/hw/i386/e820_memory_layout.c index bcf9eaf837..06970ac44a 100644 --- a/hw/i386/e820_memory_layout.c +++ b/hw/i386/e820_memory_layout.c @@ -11,29 +11,11 @@ #include "e820_memory_layout.h" static size_t e820_entries; -struct e820_table e820_reserve; struct e820_entry *e820_table; int e820_add_entry(uint64_t address, uint64_t length, uint32_t type) { - int index = le32_to_cpu(e820_reserve.count); - struct e820_entry *entry; - - if (type != E820_RAM) { - /* old FW_CFG_E820_TABLE entry -- reservations only */ - if (index >= E820_NR_ENTRIES) { - return -EBUSY; - } - entry = &e820_reserve.entry[index++]; - - entry->address = cpu_to_le64(address); - entry->length = cpu_to_le64(length); - entry->type = cpu_to_le32(type); - - e820_reserve.count = cpu_to_le32(index); - } - - /* new "etc/e820" file -- include ram too */ + /* new "etc/e820" file -- include ram and reserved entries */ e820_table = g_renew(struct e820_entry, e820_table, e820_entries + 1); e820_table[e820_entries].address = cpu_to_le64(address); e820_table[e820_entries].length = cpu_to_le64(length); diff --git a/hw/i386/fw_cfg.c b/hw/i386/fw_cfg.c index a283785a8d..72a42f3c66 100644 --- a/hw/i386/fw_cfg.c +++ b/hw/i386/fw_cfg.c @@ -36,7 +36,6 @@ const char *fw_cfg_arch_key_name(uint16_t key) {FW_CFG_ACPI_TABLES, "acpi_tables"}, {FW_CFG_SMBIOS_ENTRIES, "smbios_entries"}, {FW_CFG_IRQ0_OVERRIDE, "irq0_override"}, - {FW_CFG_E820_TABLE, "e820_table"}, {FW_CFG_HPET, "hpet"}, }; @@ -127,8 +126,6 @@ FWCfgState *fw_cfg_arch_create(MachineState *ms, #endif fw_cfg_add_i32(fw_cfg, FW_CFG_IRQ0_OVERRIDE, 1); - fw_cfg_add_bytes(fw_cfg, FW_CFG_E820_TABLE, - &e820_reserve, sizeof(e820_reserve)); fw_cfg_add_file(fw_cfg, "etc/e820", e820_table, sizeof(struct e820_entry) * e820_get_num_entries()); diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c index ffd1884100..170a331e3f 100644 --- a/hw/i386/microvm.c +++ b/hw/i386/microvm.c @@ -324,8 +324,6 @@ static void microvm_memory_init(MicrovmMachineState *mms) fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, machine->smp.max_cpus); fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)machine->ram_size); fw_cfg_add_i32(fw_cfg, FW_CFG_IRQ0_OVERRIDE, 1); - fw_cfg_add_bytes(fw_cfg, FW_CFG_E820_TABLE, - &e820_reserve, sizeof(e820_reserve)); fw_cfg_add_file(fw_cfg, "etc/e820", e820_table, sizeof(struct e820_entry) * e820_get_num_entries()); -- MST