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| author | Song Gao <gaosong@loongson.cn> | 2026-04-09 13:56:37 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2026-04-09 13:56:37 +0300 |
| commit | fa19ea9a7bdb97575e05d72305a4c40a3a631357 (patch) | |
| tree | 4d9a73986b5e7543adb9d445eefd940054e5e08a | |
| parent | 03de5eecb0f0f68f29086bc0075c7fd597bf4e4a (diff) | |
| download | linux-fa19ea9a7bdb97575e05d72305a4c40a3a631357.tar.xz | |
KVM: LoongArch: selftests: Add cpucfg read/write helpers
Add helper macros and functions to read and write CPU configuration
registers (cpucfg) from the guest and from the VMM. This interface is
required 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>
| -rw-r--r-- | tools/testing/selftests/kvm/include/loongarch/processor.h | 11 | ||||
| -rw-r--r-- | tools/testing/selftests/kvm/lib/loongarch/processor.c | 8 |
2 files changed, 19 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/include/loongarch/processor.h b/tools/testing/selftests/kvm/include/loongarch/processor.h index 76840ddda57d..6c1e59484485 100644 --- a/tools/testing/selftests/kvm/include/loongarch/processor.h +++ b/tools/testing/selftests/kvm/include/loongarch/processor.h @@ -128,6 +128,17 @@ #define CSR_TLBREHI_PS_SHIFT 0 #define CSR_TLBREHI_PS (0x3fUL << CSR_TLBREHI_PS_SHIFT) +#define read_cpucfg(reg) \ +({ \ + register unsigned long __v; \ + __asm__ __volatile__( \ + "cpucfg %0, %1\n\t" \ + : "=r" (__v) \ + : "r" (reg) \ + : "memory"); \ + __v; \ +}) + #define csr_read(csr) \ ({ \ register unsigned long __v; \ diff --git a/tools/testing/selftests/kvm/lib/loongarch/processor.c b/tools/testing/selftests/kvm/lib/loongarch/processor.c index 17aa55a2047a..0ad4544517e9 100644 --- a/tools/testing/selftests/kvm/lib/loongarch/processor.c +++ b/tools/testing/selftests/kvm/lib/loongarch/processor.c @@ -251,6 +251,14 @@ static void loongarch_set_reg(struct kvm_vcpu *vcpu, uint64_t id, uint64_t val) __vcpu_set_reg(vcpu, id, val); } +static void loongarch_set_cpucfg(struct kvm_vcpu *vcpu, uint64_t id, uint64_t val) +{ + uint64_t cfgid; + + cfgid = KVM_REG_LOONGARCH_CPUCFG | KVM_REG_SIZE_U64 | 8 * id; + __vcpu_set_reg(vcpu, cfgid, val); +} + static void loongarch_get_csr(struct kvm_vcpu *vcpu, uint64_t id, void *addr) { uint64_t csrid; |