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132 lines
4.6 KiB
132 lines
4.6 KiB
From 38220bc61bdb1614f34a53481f7604720c9e9e5a Mon Sep 17 00:00:00 2001
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From: Igor Mammedov <imammedo@redhat.com>
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Date: Tue, 20 Feb 2024 10:41:06 +0100
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Subject: [PATCH 18/20] smbios: in case of entry point is 'auto' try to build
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v2 tables 1st
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RH-Author: Igor Mammedov <imammedo@redhat.com>
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RH-MergeRequest: 230: Workaround Windows failing to find 64bit SMBIOS entry point with SeaBIOS
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RH-Jira: RHEL-21705
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RH-Acked-by: MST <mst@redhat.com>
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RH-Acked-by: Ani Sinha <None>
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RH-Commit: [16/18] becbcb3d8dad4842e5939bb75e21f4e737a4a325
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JIRA: https://issues.redhat.com/browse/RHEL-21705
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QEMU for some time now uses SMBIOS 3.0 for PC/Q35 machines by
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default, however Windows has a bug in locating SMBIOS 3.0
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entrypoint and fails to find tables when booted on SeaBIOS
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(on UEFI SMBIOS 3.0 tables work fine since firmware hands
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over tables in another way)
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Missing SMBIOS tables may lead to some issues for guest
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though (worst are: possible reactiveation, inability to
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get virtio drivers from 'Windows Update')
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It's unclear at this point if MS will fix the issue on their
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side. So instead of it (or rather in addition) this patch
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will try to workaround the issue.
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aka, use smbios-entry-point-type=auto to make QEMU try
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generating conservative SMBIOS 2.0 tables and if that
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fails (due to limits/requested configuration) fallback
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to SMBIOS 3.0 tables.
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With this in place majority of users will use SMBIOS 2.0
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tables which work fine with (Windows + legacy BIOS).
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The configurations that is not to possible to describe
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with SMBIOS 2.0 will switch automatically to SMBIOS 3.0
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(which will trigger Windows bug but there is nothing
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QEMU can do here, so go and aks Microsoft to real fix).
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Signed-off-by: Igor Mammedov <imammedo@redhat.com>
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Reviewed-by: Ani Sinha <anisinha@redhat.com>
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Tested-by: Fiona Ebner <f.ebner@proxmox.com>
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---
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hw/smbios/smbios.c | 52 +++++++++++++++++++++++++++++++++++++++++++---
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1 file changed, 49 insertions(+), 3 deletions(-)
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diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
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index 4521ea386c..3d9dcb0d31 100644
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--- a/hw/smbios/smbios.c
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+++ b/hw/smbios/smbios.c
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@@ -1097,7 +1097,7 @@ static void smbios_entry_point_setup(SmbiosEntryPointType ep_type)
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}
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}
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-void smbios_get_tables(MachineState *ms,
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+static bool smbios_get_tables_ep(MachineState *ms,
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SmbiosEntryPointType ep_type,
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const struct smbios_phys_mem_area *mem_array,
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const unsigned int mem_array_size,
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@@ -1106,6 +1106,7 @@ void smbios_get_tables(MachineState *ms,
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Error **errp)
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{
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unsigned i, dimm_cnt, offset;
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+ ERRP_GUARD();
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assert(ep_type == SMBIOS_ENTRY_POINT_TYPE_32 ||
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ep_type == SMBIOS_ENTRY_POINT_TYPE_64);
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@@ -1192,11 +1193,56 @@ void smbios_get_tables(MachineState *ms,
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abort();
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}
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- return;
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+ return true;
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err_exit:
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g_free(smbios_tables);
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smbios_tables = NULL;
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- return;
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+ return false;
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+}
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+
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+void smbios_get_tables(MachineState *ms,
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+ SmbiosEntryPointType ep_type,
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+ const struct smbios_phys_mem_area *mem_array,
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+ const unsigned int mem_array_size,
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+ uint8_t **tables, size_t *tables_len,
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+ uint8_t **anchor, size_t *anchor_len,
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+ Error **errp)
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+{
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+ Error *local_err = NULL;
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+ bool is_valid;
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+ ERRP_GUARD();
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+
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+ switch (ep_type) {
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+ case SMBIOS_ENTRY_POINT_TYPE_AUTO:
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+ case SMBIOS_ENTRY_POINT_TYPE_32:
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+ is_valid = smbios_get_tables_ep(ms, SMBIOS_ENTRY_POINT_TYPE_32,
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+ mem_array, mem_array_size,
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+ tables, tables_len,
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+ anchor, anchor_len,
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+ &local_err);
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+ if (is_valid || ep_type != SMBIOS_ENTRY_POINT_TYPE_AUTO) {
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+ break;
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+ }
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+ /*
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+ * fall through in case AUTO endpoint is selected and
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+ * SMBIOS 2.x tables can't be generated, to try if SMBIOS 3.x
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+ * tables would work
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+ */
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+ case SMBIOS_ENTRY_POINT_TYPE_64:
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+ error_free(local_err);
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+ local_err = NULL;
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+ is_valid = smbios_get_tables_ep(ms, SMBIOS_ENTRY_POINT_TYPE_64,
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+ mem_array, mem_array_size,
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+ tables, tables_len,
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+ anchor, anchor_len,
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+ &local_err);
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+ break;
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+ default:
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+ abort();
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+ }
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+ if (!is_valid) {
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+ error_propagate(errp, local_err);
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+ }
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}
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static void save_opt(const char **dest, QemuOpts *opts, const char *name)
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--
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2.39.3
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