Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) // Copyright (C) 2020 Arm Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/arm-smccc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <linux/kvm_host.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <asm/kvm_emulate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <kvm/arm_hypercalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define ARM_SMCCC_TRNG_VERSION_1_0	0x10000UL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /* Those values are deliberately separate from the generic SMCCC definitions. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define TRNG_SUCCESS			0UL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define TRNG_NOT_SUPPORTED		((unsigned long)-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define TRNG_INVALID_PARAMETER		((unsigned long)-2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define TRNG_NO_ENTROPY			((unsigned long)-3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define TRNG_MAX_BITS64			192
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static const uuid_t arm_smc_trng_uuid __aligned(4) = UUID_INIT(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	0x0d21e000, 0x4384, 0x11eb, 0x80, 0x70, 0x52, 0x44, 0x55, 0x4e, 0x5a, 0x4c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int kvm_trng_do_rnd(struct kvm_vcpu *vcpu, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	DECLARE_BITMAP(bits, TRNG_MAX_BITS64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	u32 num_bits = smccc_get_arg1(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	if (num_bits > 3 * size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		smccc_set_retval(vcpu, TRNG_INVALID_PARAMETER, 0, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	/* get as many bits as we need to fulfil the request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	for (i = 0; i < DIV_ROUND_UP(num_bits, BITS_PER_LONG); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		bits[i] = get_random_long();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	bitmap_clear(bits, num_bits, TRNG_MAX_BITS64 - num_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	if (size == 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		smccc_set_retval(vcpu, TRNG_SUCCESS, lower_32_bits(bits[1]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 				 upper_32_bits(bits[0]), lower_32_bits(bits[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		smccc_set_retval(vcpu, TRNG_SUCCESS, bits[2], bits[1], bits[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	memzero_explicit(bits, sizeof(bits));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) int kvm_trng_call(struct kvm_vcpu *vcpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	const __le32 *u = (__le32 *)arm_smc_trng_uuid.b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	u32 func_id = smccc_get_function(vcpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	unsigned long val = TRNG_NOT_SUPPORTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	int size = 64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	switch (func_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	case ARM_SMCCC_TRNG_VERSION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		val = ARM_SMCCC_TRNG_VERSION_1_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	case ARM_SMCCC_TRNG_FEATURES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 		switch (smccc_get_arg1(vcpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		case ARM_SMCCC_TRNG_VERSION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		case ARM_SMCCC_TRNG_FEATURES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		case ARM_SMCCC_TRNG_GET_UUID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		case ARM_SMCCC_TRNG_RND32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		case ARM_SMCCC_TRNG_RND64:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 			val = TRNG_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	case ARM_SMCCC_TRNG_GET_UUID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		smccc_set_retval(vcpu, le32_to_cpu(u[0]), le32_to_cpu(u[1]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 				 le32_to_cpu(u[2]), le32_to_cpu(u[3]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	case ARM_SMCCC_TRNG_RND32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		size = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	case ARM_SMCCC_TRNG_RND64:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 		return kvm_trng_do_rnd(vcpu, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	smccc_set_retval(vcpu, val, 0, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }