[OLK 5.10] AMD BusLockTrap patches backport · Pull Request !17521 · openEuler/kernel

The following are the list of patches to enable Buslock trap:
 
	x86/split_lock: Make life miserable for split lockers
	x86/split-lock: Remove unused TIF_SLD bit
	x86/split_lock: Add sysctl to control the misery mode
	Change DEFINE_SEMAPHORE() to take a number argument
	x86/cpu/vfm: Add/initialize x86_vfm field to struct cpuinfo_x86
	x86/cpu/vfm: Add new macros to work with (vendor/family/model) values
	x86/cpu/vfm: Update arch/x86/include/asm/intel-family.h
	x86/cpu/intel: Switch to new Intel CPU model defines
	x86/split_lock: Move Split and Bus lock code to a dedicated file
	x86/bus_lock: Add support for AMD
	KVM: SVM: Don't advertise Bus Lock Detect to guest if SVM support is missing
	KVM: SVM: Drop DEBUGCTL[5:2] from guest's effective value
	KVM: x86: SVM: add module param to control LBR virtualization
	KVM: x86/pmu: Gate all "unimplemented MSR" prints on report_ignored_msrs
	KVM: SVM: Suppress DEBUGCTL.BTF on AMD
	KVM: x86: Snapshot the host's DEBUGCTL in common x86
	KVM: SVM: Manually context switch DEBUGCTL if LBR virtualization is disabled
	KVM: x86: Snapshot the host's DEBUGCTL after disabling IRQs
	KVM: SVM: Treat DEBUGCTL[5:2] as reserved
	Documentation/x86: Update split lock documentation
	x86/cpu/intel: Drop stray FAM6 check with new Intel CPU model defines
	x86/split_lock: Fix the delayed detection logic
 
**Tests done to check the feature(Buslock trap)**
 
### To check Hardware support:
 
 
```
[root@volcano9f92-hostos amd]# cpuid | grep "bus lock" | head -2 
      bus lock detection                       = true 
      bus lock detection                       = true
  
```
 
### Buslock trap unit tests:
 
**Without patches:**
 
```
[root@volcano9f92-hostos amd]#  rdmsr 0x01d9 
0
[root@volcano9f92-hostos amd]# lscpu | grep -i bus 
```
 
 
**With patches:**
 
**To check kernel support:**
 
```
[root@volcano9f92-hostos amd]# grep CONFIG_X86_BUS_LOCK_DETECT /boot/config-$(uname -r) 
CONFIG_X86_BUS_LOCK_DETECT=y 
```
 
 
```
[root@volcano9f92-hostos amd]#  rdmsr 0x01d9 
4
 
[root@volcano9f92-hostos amd]# lscpu | grep -i bus 
Flags:                              ....bus_lock_detect....
```

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