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LoongArch: KVM: Add PTW feature detection on new hardware

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With new Loongson-3A6000/3C6000 hardware platforms (or later), hardware
page table walking (PTW) feature is supported on host. So here add this
feature detection on KVM host.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao
2025-09-23 23:37:08 +08:00
committed by Huacai Chen
parent 07e27ad163
commit 7109f51bcc
3 changed files with 7 additions and 0 deletions
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1
arch/loongarch/include/uapi/asm/kvm.h
View File

@@ -103,6 +103,7 @@ struct kvm_fpu {
#define KVM_LOONGARCH_VM_FEAT_PMU 5
#define KVM_LOONGARCH_VM_FEAT_PV_IPI 6
#define KVM_LOONGARCH_VM_FEAT_PV_STEALTIME 7
#define KVM_LOONGARCH_VM_FEAT_PTW 8
/* Device Control API on vcpu fd */
#define KVM_LOONGARCH_VCPU_CPUCFG 0

2
arch/loongarch/kvm/vcpu.c
View File

@@ -680,6 +680,8 @@ static int _kvm_get_cpucfg_mask(int id, u64 *v)
*v |= CPUCFG2_ARMBT;
if (cpu_has_lbt_mips)
*v |= CPUCFG2_MIPSBT;
if (cpu_has_ptw)
*v |= CPUCFG2_PTW;
return 0;
case LOONGARCH_CPUCFG3:

4
arch/loongarch/kvm/vm.c
View File

@@ -146,6 +146,10 @@ static int kvm_vm_feature_has_attr(struct kvm *kvm, struct kvm_device_attr *attr
if (kvm_pvtime_supported())
return 0;
return -ENXIO;
case KVM_LOONGARCH_VM_FEAT_PTW:
if (cpu_has_ptw)
return 0;
return -ENXIO;
default:
return -ENXIO;
}