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1733432638
When Linux is running as the root partition under Microsoft Hypervisor (MSHV) a.k.a Hyper-V, smc is used as the conduit for smc calls. Extend arm_smccc_hypervisor_has_uuid() to support this usecase. Use arm_smccc_1_1_invoke to retrieve and use the appropriate conduit instead of supporting only hvc. Boot tested on MSHV guest, MSHV root & KVM guest. Signed-off-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Tested-by: Roman Kisel <romank@linux.microsoft.com> Reviewed-by: Roman Kisel <romank@linux.microsoft.com> Message-Id: <20250521094049.960056-1-anirudh@anirudhrb.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 Arm Limited
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*/
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#define pr_fmt(fmt) "smccc: " fmt
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#include <linux/cache.h>
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#include <linux/init.h>
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#include <linux/arm-smccc.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <asm/archrandom.h>
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static u32 smccc_version = ARM_SMCCC_VERSION_1_0;
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static enum arm_smccc_conduit smccc_conduit = SMCCC_CONDUIT_NONE;
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bool __ro_after_init smccc_trng_available = false;
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s32 __ro_after_init smccc_soc_id_version = SMCCC_RET_NOT_SUPPORTED;
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s32 __ro_after_init smccc_soc_id_revision = SMCCC_RET_NOT_SUPPORTED;
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void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit)
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{
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struct arm_smccc_res res;
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smccc_version = version;
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smccc_conduit = conduit;
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smccc_trng_available = smccc_probe_trng();
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if ((smccc_version >= ARM_SMCCC_VERSION_1_2) &&
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(smccc_conduit != SMCCC_CONDUIT_NONE)) {
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arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
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ARM_SMCCC_ARCH_SOC_ID, &res);
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if ((s32)res.a0 >= 0) {
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arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 0, &res);
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smccc_soc_id_version = (s32)res.a0;
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arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_SOC_ID, 1, &res);
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smccc_soc_id_revision = (s32)res.a0;
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}
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}
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}
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enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
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{
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if (smccc_version < ARM_SMCCC_VERSION_1_1)
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return SMCCC_CONDUIT_NONE;
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return smccc_conduit;
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}
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EXPORT_SYMBOL_GPL(arm_smccc_1_1_get_conduit);
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u32 arm_smccc_get_version(void)
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{
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return smccc_version;
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}
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EXPORT_SYMBOL_GPL(arm_smccc_get_version);
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s32 arm_smccc_get_soc_id_version(void)
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{
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return smccc_soc_id_version;
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}
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s32 arm_smccc_get_soc_id_revision(void)
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{
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return smccc_soc_id_revision;
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}
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EXPORT_SYMBOL_GPL(arm_smccc_get_soc_id_revision);
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bool arm_smccc_hypervisor_has_uuid(const uuid_t *hyp_uuid)
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{
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struct arm_smccc_res res = {};
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uuid_t uuid;
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arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
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if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
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return false;
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uuid = smccc_res_to_uuid(res.a0, res.a1, res.a2, res.a3);
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return uuid_equal(&uuid, hyp_uuid);
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}
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EXPORT_SYMBOL_GPL(arm_smccc_hypervisor_has_uuid);
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static int __init smccc_devices_init(void)
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{
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struct platform_device *pdev;
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if (smccc_trng_available) {
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pdev = platform_device_register_simple("smccc_trng", -1,
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NULL, 0);
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if (IS_ERR(pdev))
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pr_err("smccc_trng: could not register device: %ld\n",
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PTR_ERR(pdev));
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}
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return 0;
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}
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device_initcall(smccc_devices_init);
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