[PATCH 00/19] Workaround Windows failing to find 64bit SMBIOS entry point with SeaBIOS

[Igor Mammedov]

Windows (10) bootloader when running on top of SeaBIOS, fails to find           
 
SMBIOSv3 entry point. Tracing it shows that it looks for v2 anchor markers      
 
only and not v3. Tricking it into believing that entry point is found           
 
lets Windows successfully locate and parse SMBIOSv3 tables. Whether it          
 
will be fixed on Windows side is not clear so here goes a workaround.           
 
                                                                                
 
Idea is to try build v2 tables if QEMU configuration permits,                   
 
and fallback to v3 tables otherwise. That will mask Windows issue               
 
form majority of users.                                                         
 
However if VM configuration can't be described (typically large VMs)            
 
by v2 tables, QEMU will use SMBIOSv3 and Windows will hit the issue             
 
again. In this case complain to Microsoft and/or use UEFI instead of            
 
SeaBIOS (requires reinstall).                                                   
 
                                                                                
 
Default compat setting of smbios-entry-point-type after series                  
 
for pc/q35 machines:                                                            
 
  * 9.0-newer: 'auto'                                                           
 
  * 8.1-8.2: '64'                                                               
 
  * 8.0-older: '32'                                                             
 
                                                                                
 
Fixes: https://gitlab.com/qemu-project/qemu/-/issues/2008                       
 
CC: peter.maydell@linaro.org                                                    
 
CC: pbonzini@redhat.com                                                         
 
CC: mst@redhat.com                                                              
 
CC: gaosong@loongson.cn                                                         
 
CC: alistair.francis@wdc.com                                                    
 
CC: palmer@dabbelt.com                                                          
 
CC: bin.meng@windriver.com                                                      
 
CC: liwei1518@gmail.com                                                         
 
CC: dbarboza@ventanamicro.com                                                   
 
CC: zhiwei_liu@linux.alibaba.com                                                
 
CC: imammedo@redhat.com                                                         
 
CC: anisinha@redhat.com                                                         
 
CC: philmd@linaro.org                                                           
 
CC: wangyanan55@huawei.com                                                      
 
CC: eblake@redhat.com                                                           
 
CC: armbru@redhat.com                                                           
 
CC: qemu-arm@nongnu.org                                                         
 
CC: qemu-riscv@nongnu.org                                                       
 
CC: f.ebner@proxmox.com                                                         
 
                          
Igor Mammedov (19):
  tests: smbios: make it possible to write SMBIOS only test
  tests: smbios: add test for -smbios type=11 option
  tests: smbios: add test for legacy mode CLI options
  smbios: cleanup smbios_get_tables() from legacy handling
  smbios: get rid of smbios_smp_sockets global
  smbios: get rid of smbios_legacy global
  smbios: avoid mangling user provided tables
  smbios: don't check type4 structures in legacy mode
  smbios: build legacy mode code only for 'pc' machine
  smbios: handle errors consistently
  smbios: clear smbios_tables pointer after freeing
  get rid of global smbios_ep_type
  smbios: extend smbios-entry-point-type with 'auto' value
  smbios: in case of entry point is 'auto' try to build v2 tables 1st
  smbios: error out when building type 4 table is not possible
  smbios: clear smbios_type4_count before building tables
  tests: acpi/smbios: whitelist expected blobs
  pc/q35: set SMBIOS entry point type to 'auto' by default
  tests: acpi: update expected SSDT.dimmpxm blob

 hw/i386/fw_cfg.h                     |   3 +-
 include/hw/firmware/smbios.h         |  29 +-
 hw/arm/virt.c                        |   6 +-
 hw/i386/Kconfig                      |   1 +
 hw/i386/fw_cfg.c                     |  14 +-
 hw/i386/pc.c                         |   4 +-
 hw/i386/pc_piix.c                    |   4 +
 hw/i386/pc_q35.c                     |   3 +
 hw/loongarch/virt.c                  |   7 +-
 hw/riscv/virt.c                      |   6 +-
 hw/smbios/Kconfig                    |   2 +
 hw/smbios/meson.build                |   4 +
 hw/smbios/smbios.c                   | 481 +++++++++++----------------
 hw/smbios/smbios_legacy.c            | 185 +++++++++++
 hw/smbios/smbios_legacy_stub.c       |  16 +
 qapi/machine.json                    |   5 +-
 tests/data/acpi/q35/SSDT.dimmpxm     | Bin 1815 -> 1815 bytes
 tests/data/smbios/type11_blob        | Bin 0 -> 11 bytes
 tests/data/smbios/type11_blob.legacy | Bin 0 -> 10 bytes
 tests/qtest/bios-tables-test.c       |  81 ++++-
 20 files changed, 535 insertions(+), 316 deletions(-)
 create mode 100644 hw/smbios/smbios_legacy.c
 create mode 100644 hw/smbios/smbios_legacy_stub.c
 create mode 100644 tests/data/smbios/type11_blob
 create mode 100644 tests/data/smbios/type11_blob.legacy

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2.39.3