Hello According to "IA32 SDM, page 1428, 4-330 Vol. 2B, RSM?Resume from System Management Mode", I do not find word say: 64bit mode is invalid. Would you please point out where you find "RSM is invalid in 64-bit mode "?
=========================== Operation ReturnFromSMM; IF (IA-32e mode supported) or (CPUID DisplayFamily_DisplayModel = 06H_0CH ) THEN ProcessorState ← Restore(SMMDump(IA-32e SMM STATE MAP)); Else ProcessorState ← Restore(SMMDump(Non-32-Bit-Mode SMM STATE MAP)); FI 64-Bit Mode Exceptions Same exceptions as in protected mode. =========================== -----Original Message----- From: edk2-devel [mailto:[email protected]] On Behalf Of Paolo Bonzini Sent: Friday, October 16, 2015 3:19 PM To: Fan, Jeff; Laszlo Ersek; [email protected] Cc: Kinney, Michael D Subject: Re: [edk2] [PATCH v3 03/52] UefiCpuPkg: PiSmmCpuDxeSmm: do not execute RSM from 64-bit mode On 15/10/2015 03:31, Fan, Jeff wrote: > Ersek & Bonzini, > > From SDM 34.5.2, SMI Handler Operating Mode Switching. > "Any required change to operating mode is performed by the RSM > instruction; there is no need for the SMI handler to change modes explicitly > prior to executing RSM." > > So, I don't think we need to go back to 32-bit PM before RSM. The instruction set reference, however, says that RSM is invalid in 64-bit mode. Paolo _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
