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

[Fiona Ebner]

Am 27.02.24 um 16:47 schrieb Igor Mammedov:
> Windows (10) bootloader when running on top of SeaBIOS, fails to find         
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> SMBIOSv3 entry point. Tracing it shows that it looks for v2 anchor markers    
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> only and not v3. Tricking it into believing that entry point is found         
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> lets Windows successfully locate and parse SMBIOSv3 tables. Whether it        
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> will be fixed on Windows side is not clear so here goes a workaround.         
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>                                                                               
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> Idea is to try build v2 tables if QEMU configuration permits,                 
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> and fallback to v3 tables otherwise. That will mask Windows issue             
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> form majority of users.                                                       
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> However if VM configuration can't be described (typically large VMs)          
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> by v2 tables, QEMU will use SMBIOSv3 and Windows will hit the issue           
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> again. In this case complain to Microsoft and/or use UEFI instead of          
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> SeaBIOS (requires reinstall).                                                 
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>                                                                               
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> Default compat setting of smbios-entry-point-type after series                
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> for pc/q35 machines:                                                          
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>   * 9.0-newer: 'auto'                                                         
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>   * 8.1-8.2: '64'                                                             
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>   * 8.0-older: '32'                                                           
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>                                                                               
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> Fixes: https://gitlab.com/qemu-project/qemu/-/issues/2008                     
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Thank you! I'm happy to confirm that this series works around the issue :)

Best Regards,
Fiona