VirtualBox

Ticket #9425 (new defect)

Opened 3 years ago

CPUID Leaf 4 not functioning on Core i7

Reported by: Ameise Owned by:
Priority: minor Component: VMM
Version: VirtualBox 4.1.0 Keywords: cpuid intel cache
Cc: Guest type: other
Host type: Windows

Description

When using the hypervisor (VT-x) and in Long Mode, when executing a CPUID Leaf 4 operation on my CPU (Intel Core i7), with the level being 3 (L3 cache), it is returning all zeros. If I execute the same operation on bare metal, it returns the proper data.

mov rax, 0x4 mov rcx, 0x3 cpuid ; rax, rbx, rcx, and rdx are all zeros.

It should report the cache information for the level 3 cache.

If running Linux on this, Linux reports the L3 cache as non-existent, and the L2 cache as being 6MB. Running CPUID on bare metal reports the L2 cache as 256KB, and the L3 cache as 8MB.

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