en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/lib/loongarch/processor.c#11c840192768a5a63b6aed75273c5e8e416230ee KVM: LoongArch: selftests: Add basic PMU event counting testIntroduce a basic PMU test that verifies hardware event counting forfour performance counters. The test enables the events for CPU cycles,instructions retired, branch instructions, and branch misses, runs afixed number of loops, and checks that the counter values fall withinexpected ranges. It also validates that the host supports PMU and thatthe VM feature is enabled.Signed-off-by: Song Gao <gaosong@loongson.cn>Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> List of files: /linux/tools/testing/selftests/kvm/lib/loongarch/processor.c Thu, 09 Apr 2026 12:56:37 +0200 Song Gao <gaosong@loongson.cn> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/lib/loongarch/processor.c#fa19ea9a7bdb97575e05d72305a4c40a3a631357 KVM: LoongArch: selftests: Add cpucfg read/write helpersAdd helper macros and functions to read and write CPU configurationregisters (cpucfg) from the guest and from the VMM. This interface isrequired in upcoming selftests for querying and setting CPU features,such as PMU capabilities.Signed-off-by: Song Gao <gaosong@loongson.cn>Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> List of files: /linux/tools/testing/selftests/kvm/lib/loongarch/processor.c Thu, 09 Apr 2026 12:56:37 +0200 Song Gao <gaosong@loongson.cn> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/lib/loongarch/processor.c#9f073ac25b4c4cf3b3ea13b155035108c54148bb KVM: selftests: Add "struct kvm_mmu" to track a given MMU instanceAdd a "struct kvm_mmu" to track a given MMU instance, e.g. a VM's stage-1MMU versus a VM's stage-2 MMU, so that x86 can share MMU functionality forboth stage-1 and stage-2 MMUs, without creating the potential for subtlebugs, e.g. due to consuming on vm->pgtable_levels when operating a stage-2MMU.Encapsulate the existing de facto MMU in "struct kvm_vm", e.g instead ofburying the MMU details in "struct kvm_vm_arch", to avoid more #ifdefs in____vm_create(), and in the hopes that other architectures can utilize theformalized MMU structure if/when they too support stage-2 page tables.No functional change intended.Reviewed-by: Yosry Ahmed <yosry.ahmed@linux.dev>Link: https://patch.msgid.link/20251230230150.4150236-7-seanjc@google.comSigned-off-by: Sean Christopherson <seanjc@google.com> List of files: /linux/tools/testing/selftests/kvm/lib/loongarch/processor.c Wed, 31 Dec 2025 00:01:35 +0100 Sean Christopherson <seanjc@google.com> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/lib/loongarch/processor.c#0f90fa6e2e9d98349492d9968c11ceaf2f958c98 KVM: LoongArch: selftests: Add time counter test caseWith time counter test, it is to verify that time count starts from 0and always grows up then.Signed-off-by: Bibo Mao <maobibo@loongson.cn>Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> List of files: /linux/tools/testing/selftests/kvm/lib/loongarch/processor.c Fri, 28 Nov 2025 07:49:48 +0100 Bibo Mao <maobibo@loongson.cn> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/lib/loongarch/processor.c#df41742343fad11fde06e085096003d64599785f KVM: LoongArch: selftests: Add timer interrupt test caseAdd timer test case based on common arch_timer code, timer interruptwith one-shot and period mode is tested.Signed-off-by: Bibo Mao <maobibo@loongson.cn>Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> List of files: /linux/tools/testing/selftests/kvm/lib/loongarch/processor.c Fri, 28 Nov 2025 07:49:44 +0100 Bibo Mao <maobibo@loongson.cn> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/lib/loongarch/processor.c#d84fe2f30b0a0cbe08260c00a84ffe42161c95ce KVM: LoongArch: selftests: Add exception handler register interfaceAdd interrupt and exception handler register interface. When exceptionhappens, execute registered exception handler if exists, else report anerror.Signed-off-by: Bibo Mao <maobibo@loongson.cn>Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> List of files: /linux/tools/testing/selftests/kvm/lib/loongarch/processor.c Thu, 27 Nov 2025 04:00:18 +0100 Bibo Mao <maobibo@loongson.cn> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/lib/loongarch/processor.c#1c5d3a1eab32db1ebb0d5d30736e9236e8a7014f KVM: LoongArch: selftests: Add basic interfacesAdd some basic function interfaces such as CSR register access, localirq enable or disable APIs.Signed-off-by: Bibo Mao <maobibo@loongson.cn>Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> List of files: /linux/tools/testing/selftests/kvm/lib/loongarch/processor.c Thu, 27 Nov 2025 04:00:18 +0100 Bibo Mao <maobibo@loongson.cn> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/kvm/lib/loongarch/processor.c#2ebf31d59f583449422f4b2dad59b0130e750117 KVM: selftests: Add core KVM selftests support for LoongArchAdd core KVM selftests support for LoongArch, it includes exceptionhandler, mmu page table setup and vCPU startup entry support.Signed-off-by: Bibo Mao <maobibo@loongson.cn>Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> List of files: /linux/tools/testing/selftests/kvm/lib/loongarch/processor.c Tue, 20 May 2025 14:20:26 +0200 Bibo Mao <maobibo@loongson.cn>