1 // SPDX-License-Identifier: GPL-2.0
3 #define pr_fmt(fmt) "smccc: KVM: " fmt
5 #include <linux/arm-smccc.h>
6 #include <linux/bitmap.h>
7 #include <linux/cache.h>
8 #include <linux/kernel.h>
9 #include <linux/string.h>
11 #include <asm/hypervisor.h>
13 static DECLARE_BITMAP(__kvm_arm_hyp_services, ARM_SMCCC_KVM_NUM_FUNCS) __ro_after_init = { };
15 void __init kvm_init_hyp_services(void)
17 struct arm_smccc_res res;
20 if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_HVC)
23 arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
24 if (res.a0 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 ||
25 res.a1 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 ||
26 res.a2 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 ||
27 res.a3 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3)
30 memset(&res, 0, sizeof(res));
31 arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID, &res);
33 val[0] = lower_32_bits(res.a0);
34 val[1] = lower_32_bits(res.a1);
35 val[2] = lower_32_bits(res.a2);
36 val[3] = lower_32_bits(res.a3);
38 bitmap_from_arr32(__kvm_arm_hyp_services, val, ARM_SMCCC_KVM_NUM_FUNCS);
40 pr_info("hypervisor services detected (0x%08lx 0x%08lx 0x%08lx 0x%08lx)\n",
41 res.a3, res.a2, res.a1, res.a0);
44 bool kvm_arm_hyp_service_available(u32 func_id)
46 if (func_id >= ARM_SMCCC_KVM_NUM_FUNCS)
49 return test_bit(func_id, __kvm_arm_hyp_services);
51 EXPORT_SYMBOL_GPL(kvm_arm_hyp_service_available);