Opened 13 years ago
Last modified 4 years ago
#9425 closed defect
CPUID Leaf 4 not functioning on Core i7 — at Initial Version
| Reported by: | Ameise | Owned by: | |
|---|---|---|---|
| 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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