qemu-kvm/kvm-smbios-don-t-check-type4-structures-in-legacy-mode.patch

From 2b76d95ec07aba6d96070ee90c5015c1676be091 Mon Sep 17 00:00:00 2001
From: Igor Mammedov <imammedo@redhat.com>
Date: Tue, 13 Feb 2024 16:25:54 +0100
Subject: [PATCH 10/20] smbios: don't check type4 structures in legacy mode

RH-Author: Igor Mammedov <imammedo@redhat.com>
RH-MergeRequest: 230: Workaround Windows failing to find 64bit SMBIOS entry point with SeaBIOS
RH-Jira: RHEL-21705
RH-Acked-by: MST <mst@redhat.com>
RH-Acked-by: Ani Sinha <None>
RH-Commit: [8/18] c1f8409ea0d916f333c9373535bf21b521c62855

JIRA: https://issues.redhat.com/browse/RHEL-21705

    legacy mode doesn't support structures of type 2 and more,
    and CLI has a check for '-smbios type' option, however it's
    still possible to sneak in type4 as a blob with '-smbios file'
    option. However doing the later makes SMBIOS tables broken
    since SeaBIOS doesn't expect that.

    Rather than trying to add support for type4 to legacy code
    (both QEMU and SeaBIOS), simplify smbios_get_table_legacy()
    by dropping not relevant check in legacy code and error out
    on type4 blob.

    Signed-off-by: Igor Mammedov <imammedo@redhat.com>
    Reviewed-by: Ani Sinha <anisinha@redhat.com>
    Tested-by: Fiona Ebner <f.ebner@proxmox.com>

Conflicts: include/hw/firmware/smbios.h
Signed-off-by: Igor Mammedov <imammedo@redhat.com>

 Please enter the commit message for your changes. Lines starting
---
 hw/i386/fw_cfg.c             |  3 +--
 hw/smbios/smbios.c           | 18 ++++++++++++++----
 include/hw/firmware/smbios.h |  2 +-
 3 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/hw/i386/fw_cfg.c b/hw/i386/fw_cfg.c
index bb7149c4c3..a25793a68f 100644
--- a/hw/i386/fw_cfg.c
+++ b/hw/i386/fw_cfg.c
@@ -73,8 +73,7 @@ void fw_cfg_build_smbios(PCMachineState *pcms, FWCfgState *fw_cfg)
     smbios_set_cpuid(cpu->env.cpuid_version, cpu->env.features[FEAT_1_EDX]);
 
     if (pcmc->smbios_legacy_mode) {
-        smbios_tables = smbios_get_table_legacy(ms->smp.cpus,
-                                                &smbios_tables_len);
+        smbios_tables = smbios_get_table_legacy(&smbios_tables_len);
         fw_cfg_add_bytes(fw_cfg, FW_CFG_SMBIOS_ENTRIES,
                          smbios_tables, smbios_tables_len);
         return;
diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index d8d68716d4..441517cf24 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -530,14 +530,17 @@ opts_init(smbios_register_config);
  */
 #define SMBIOS_21_MAX_TABLES_LEN 0xffff
 
-static void smbios_validate_table(uint32_t expected_t4_count)
+static void smbios_check_type4_count(uint32_t expected_t4_count)
 {
     if (smbios_type4_count && smbios_type4_count != expected_t4_count) {
         error_report("Expected %d SMBIOS Type 4 tables, got %d instead",
                      expected_t4_count, smbios_type4_count);
         exit(1);
     }
+}
 
+static void smbios_validate_table(void)
+{
     if (smbios_ep_type == SMBIOS_ENTRY_POINT_TYPE_32 &&
         smbios_tables_len > SMBIOS_21_MAX_TABLES_LEN) {
         error_report("SMBIOS 2.1 table length %zu exceeds %d",
@@ -622,7 +625,7 @@ static void smbios_build_type_1_fields(void)
     }
 }
 
-uint8_t *smbios_get_table_legacy(uint32_t expected_t4_count, size_t *length)
+uint8_t *smbios_get_table_legacy(size_t *length)
 {
     int i;
     size_t usr_offset;
@@ -635,6 +638,12 @@ uint8_t *smbios_get_table_legacy(uint32_t expected_t4_count, size_t *length)
         exit(1);
     }
 
+    if (test_bit(4, have_binfile_bitmap)) {
+        error_report("can't process table for smbios "
+                     "type 4 on machine versions < 2.1!");
+        exit(1);
+    }
+
     g_free(smbios_entries);
     smbios_entries_len = sizeof(uint16_t);
     smbios_entries = g_malloc0(smbios_entries_len);
@@ -661,7 +670,7 @@ uint8_t *smbios_get_table_legacy(uint32_t expected_t4_count, size_t *length)
 
     smbios_build_type_0_fields();
     smbios_build_type_1_fields();
-    smbios_validate_table(expected_t4_count);
+    smbios_validate_table();
     *length = smbios_entries_len;
     return smbios_entries;
 }
@@ -1319,7 +1328,8 @@ void smbios_get_tables(MachineState *ms,
     smbios_build_type_41_table(errp);
     smbios_build_type_127_table();
 
-    smbios_validate_table(ms->smp.sockets);
+    smbios_check_type4_count(ms->smp.sockets);
+    smbios_validate_table();
     smbios_entry_point_setup();
 
     /* return tables blob and entry point (anchor), and their sizes */
diff --git a/include/hw/firmware/smbios.h b/include/hw/firmware/smbios.h
index b9fc9a0f42..d55018e5e3 100644
--- a/include/hw/firmware/smbios.h
+++ b/include/hw/firmware/smbios.h
@@ -315,7 +315,7 @@ void smbios_set_defaults(const char *manufacturer, const char *product,
                          SmbiosEntryPointType ep_type,
                          const char *stream_product,
                          const char *stream_version);
-uint8_t *smbios_get_table_legacy(uint32_t expected_t4_count, size_t *length);
+uint8_t *smbios_get_table_legacy(size_t *length);
 void smbios_get_tables(MachineState *ms,
                        const struct smbios_phys_mem_area *mem_array,
                        const unsigned int mem_array_size,
-- 
2.39.3