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(parent: c9f0969) | patch
virt: fix detection of avx2 and friends
authorYu Watanabe <watanabe.yu+github@gmail.com>
Mon, 8 Jan 2024 10:59:32 +0000 (19:59 +0900)
committerLennart Poettering <lennart@poettering.net>
Mon, 8 Jan 2024 15:04:17 +0000 (16:04 +0100)
commite701439998a5697317f7692aa5f169bd7315b733
tree614cccf0cb19943af59b7859d9a26af603925fa5tree | snapshot
parentc9f096969a77e34cf52bd3b6c63fa686ab25c471commit | diff
virt: fix detection of avx2 and friends

To get the CPUID with EAX=7, we need explicitly set 0 to ECX.

From Intel® Architecture Instruction Set Extensions Programming
Reference and Related Specifications,
===
Leaf 07H output depends on the initial value in ECX.
If ECX contains an invalid sub leaf index, EAX/EBX/ECX/EDX return 0
===

Fixes #30822.
src/basic/virt.c diff | blob | history
https://github.com/systemd/systemd.git