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KVM: LoongArch: selftests: Enable LSX/LASX by auto detection

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Add LSX and LASX features when VM is created. These features are detected
firstly, enable it if it is available on host machine.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2026-08-10 12:21:58 +08:00 committed by Huacai Chen
parent 9b61ad973c
commit 7513f2298c
2 changed files with 20 additions and 1 deletions
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10
tools/testing/selftests/kvm/include/loongarch/processor.h
View File

@ -70,6 +70,16 @@
#define PS_64K 0x00000010
#define PS_DEFAULT_SIZE PS_16K
#define LOONGARCH_CPUCFG2 0x2
#define CPUCFG2_FP BIT(0)
#define CPUCFG2_FPSP BIT(1)
#define CPUCFG2_FPDP BIT(2)
#define CPUCFG2_FPVERS GENMASK(5, 3)
#define CPUCFG2_LSX BIT(6)
#define CPUCFG2_LASX BIT(7)
#define CPUCFG2_LLFTP BIT(14)
#define CPUCFG2_LLFTPREV GENMASK(17, 15)
/* LoongArch Basic CSR registers */
#define LOONGARCH_CSR_CRMD 0x0 /* Current mode info */
#define CSR_CRMD_PG_SHIFT 4

11
tools/testing/selftests/kvm/lib/loongarch/processor.c
View File

@ -278,7 +278,7 @@ static void loongarch_set_csr(struct kvm_vcpu *vcpu, u64 id, u64 val)
void loongarch_vcpu_setup(struct kvm_vcpu *vcpu)
{
int width;
int ret, width;
unsigned int cfg;
unsigned long val;
struct kvm_vm *vm = vcpu->vm;
@ -292,6 +292,15 @@ void loongarch_vcpu_setup(struct kvm_vcpu *vcpu)
TEST_FAIL("Unknown guest mode, mode: 0x%x", vm->mode);
}
/* Enable LSX/LASX feature by detecting host capability */
cfg = CPUCFG2_FP | CPUCFG2_FPSP | CPUCFG2_FPDP | CPUCFG2_LLFTP;
ret = __kvm_has_device_attr(vm->fd, KVM_LOONGARCH_VM_FEAT_CTRL, KVM_LOONGARCH_VM_FEAT_LSX);
if (!ret)
cfg |= CPUCFG2_LSX;
ret = __kvm_has_device_attr(vm->fd, KVM_LOONGARCH_VM_FEAT_CTRL, KVM_LOONGARCH_VM_FEAT_LASX);
if (!ret)
cfg |= CPUCFG2_LASX;
loongarch_set_cpucfg(vcpu, LOONGARCH_CPUCFG2, cfg);
cfg = read_cpucfg(LOONGARCH_CPUCFG6);
loongarch_set_cpucfg(vcpu, LOONGARCH_CPUCFG6, cfg);