Re: [edk2-devel] Problems with modifying variables after S4 recovery

["Ni, Ray via groups.io" <ray.ni=intel.com@groups.io>]

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I checked the ACPI spec and it says the UEFI RuntimeCode/RuntimeData is treated as AddressRangeReserved type by OS (see ACPI spec 15.3 UEFI GetMemoryMap() Boot Services Function)

I think the AddressRangeReserved type is NOT restored by OS when resuming from S4.
Can you double check?



Thanks,
Ray

________________________________
From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of 张辰 <zhangchen@loongson.cn>
Sent: Friday, January 17, 2025 16:42
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: gaoliming <gaoliming@byosoft.com.cn>; lichao <lichao@loongson.cn>; 钱东彦 <qiandongyan@loongson.cn>; Kinney, Michael D <michael.d.kinney@intel.com>
Subject: [edk2-devel] Problems with modifying variables after S4 recovery

Hello，

An issue regarding the variable has been encountered on the LoongArch platform. Modifying the variable using efivar after S4 resume will cause data corruption in the flash.
It was found that when starting from S4, the BIOS might write to the variable. After the system resumes, the data in the runtime memory will also be restored, resulting in inconsistent data between that in the VARIABLE_MODULE_GLOBAL structure and the actual data. There is already data in the flash area corresponding to NonVolatileLastVariableOffset.
It's suspected that there will also be problems on other platforms. I'd like to know whether other platforms have encountered similar problems and if there are any solutions?

Thanks
________________________________
zhangchen@loongson.cn


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