x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper Since 923f3a2b48bd ("x86/resctrl: Query LLC monitoring properties once during boot") resctrl_cpu_detect() has been moved from common CPU initialization code to the vendor-specific BSP init helper, while Hygon didn't put that call in their code. This triggers a division by zero fault during early booting stage on our machines with X86_FEATURE_CQM* supported, where get_rdt_mon_resources() tries to calculate mon_l3_config with uninitialized boot_cpu_data.x86_cache_occ_scale. Add the missing resctrl_cpu_detect() in the Hygon BSP init helper. [ bp: Massage commit message. ]

Timeline

1. Sep 5, 2025, 5:20 PM UTCCVE published
2. Oct 15, 2026, 1:07 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 · fixed in 62f12cde10118253348a7540e85606869bd69432; From 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 · fixed in 873f32201df8876bdb2563e3187e79149427cab4; From 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 · fixed in fb81222c1559f89bfe3aa1010f6d112531d55353; From 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 · fixed in 7207923d8453ebfb35667c1736169f2dd796772e; From 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 · fixed in a9e5924daa954c9f585c1ca00358afe71d6781c4; From 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 · fixed in d23264c257a70dbe021b43b3bc2ee16134cd2c69; From 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 · fixed in d8df126349dad855cdfedd6bbf315bad2e901c2f

• Linux Linux

  5.8

• KernelLinux

  From 5.8.0 · fixed in 5.10.242; From 5.11.0 · fixed in 5.15.190; From 5.16.0 · fixed in 6.1.149; From 6.2.0 · fixed in 6.6.103; From 6.7.0 · fixed in 6.12.44; From 6.13.0 · fixed in 6.16.4

References 7