Meaning of lines hostCPUID, userCPUID, and guestCPUID in the vmware.log file

I'm trying to get a solid knowledge about the exact meaning of the hostCPUID, userCPUID and guestCPUID entries in the vmware.log file.

I'm well versed in masking of CPU and I know how to change masks with cpuid. < number >. < enter > = 'XXXXXXX '.

I guess the 'host' in hostCPUID is the bits real raw CPUID reported to ESXi by the host CPU.

What is less clear, exactly what are the values 'guest' and 'user '. Based on the name, guestCPUID looks like the bits of functionality exposed to the virtual machine. However, I don't see how the guestCPUID is established, in view of the hostCPUID and my own cpuid. < num >. < Register > masking. Maybe there is some other implicit mask takes into account as well?

And finally "userCPUID"is completely baffling to me." Maybe something to do with the CPUID features in a mode not ring-0?

Any clarification would be helpful. Many hours of research on Google are not getting obvious answers.

Thank you

Matt

MattPietrek wrote:

I'm trying to get a solid knowledge about the exact meaning of the hostCPUID, userCPUID and guestCPUID entries in the vmware.log file.

I have poured into the masking of CPU and I know how to change masks with cpuid. . = "XXXXXXX".

I guess the 'host' in hostCPUID is the bits real raw CPUID reported to ESXi by the host CPU.

What is less clear, exactly what are the values 'guest' and 'user '. Based on the name, guestCPUID looks like the bits of functionality exposed to the virtual machine. However, I don't see how the guestCPUID is established, in view of the hostCPUID and my own cpuid. . masking. Maybe there is some other implicit mask takes into account as well?

And finally "userCPUID"is completely baffling to me." Maybe something to do with the CPUID features in a mode not ring-0?

Any clarification would be helpful. Many hours of research on Google are not getting obvious answers.

Thank you

Matt

You are basically correct.  GuestCPUID represents the bits of functionality exposed to the virtual machine.  In addition to your mask, there are masks applied depending on the features supported by the virtual hardware.

UserCPUID, this is what will be visible to code ringtone-3 comments running in native mode if you use the binary translation.  With binary translation, usually only ring-0 code (or IOPL-3) is subject to the binary translation.  Most ring-3 of the code is running in native mode (in the mode that we call "direct execution.")  Before the introduction of CPUID failing, it was impossible to intercept comments the CPUID instruction execution when the guest was performed in direct execution.  Some processors support a limited ability to derogate some CPUID leaves (on a basis of registry by registry) even without intercept the CPUID instruction.  Therefore, userCPUID is based on hostCPUID, but records that can be replaced have values of guestCPUID.

These fields are rewritten in every market, so there is little interest to change them manually.

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