CPUID (1) do not return don't not every bit of functionality on the new Xeon Quad-core processors?

I use VMWare Player 3.0.1 build 227600 and have noticed the same problem on Windows xp and RedHat Linux images a quad-core Xeon. A colleague has seen the same problem using Fusion as well.

On the host operating system (Mac / Windows / Linux) I am getting the output of the CPUID (1) next:

CPUID (1): eax = 0x000106a5 ebx = 00100800 ecx = 0x009ce3bd edx = 0xbfebfbff x 0

Present exactly the same code within an operating system invited to VMWare Player:

CPUID (1): eax = 0x000106a5 ebx = 04100800 ecx = 0 x 00980201 edx = 0x0febfbff x 0

Futher code in the library specifically to care little 28 in the edx register, which is located on processors that support hyperthreading or multiple cores (and as we know, the new Xeons support both). My images VMWare configured to run at 2 or 4 processors, but identification CPUID code does NOT see EDX bit 28 as being fixed. Example code for the multi-CPU identification of Intel assumes this bit is defined for topology CPU counts as well. (I won't go into the other differences in ebx, ecx and edx).

The same test code running on a Core 2 Duo on the host operating system product:

CPUID (1): eax = 0x000006f6 ebx = 01020800 ecx = 0x0000e3bd edx = 0xbfebfbff x 0

Operating exactly the same code in a guest OS in VMWare player on the Intel Core 2 Duo (same image VMWare):

CPUID (1): eax = 0x000006f6 ebx = 00020800 ecx = 0x0000e3bd edx = 0xbfebfbff x 0

As far as I know, the only variable here is the CPU. The code that runs directly in a welcome what OS behaves properly on the Xeon Quad-core and Core 2 Duo, so the problem seems to be somewhere in VMWare Player.

From what I saw, there were several problems Xeon in VMWare for a while - maybe it's just another one of them.

Has anyone other saw this and have a reasonable and safe solution to correctly detect the core CPU / cache topology if VMWare is the mixture?

If you run your guests with binary translation, we are unable to intercept CPUID executed at CPL3, because that code runs in direct execution.  Under the binary translation, that we can only intercept CPL0 CPUID instructions that we translate.  The title of the material assistance to virtualization, intercept us all the instructions of CPUID, regardless the privilege level.  I suppose you issue CPUID from user code at CPL3.  You should be able to play with the privileged execution mode and see the effects of translation binary vs VT - x.

Under translation binary, if you "clear acceleration", that we can intercept all the instructions of CPUID, because then everything is translated.

Tags: VMware

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