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821d935c87
As the SMCCC (and related specifications) march towards an 'everything and the kitchen sink' interface for interacting with a system it becomes less likely that KVM will support every related feature. We could do better by letting userspace have a crack at it instead. Allow userspace to define an 'SMCCC filter' that applies to both HVCs and SMCs initiated by the guest. Supporting both conduits with this interface is important for a couple of reasons. Guest SMC usage is table stakes for a nested guest, as HVCs are always taken to the virtual EL2. Additionally, guests may want to interact with a service on the secure side which can now be proxied by userspace. Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20230404154050.2270077-10-oliver.upton@linux.dev
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2019 Arm Ltd. */
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#ifndef __KVM_ARM_HYPERCALLS_H
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#define __KVM_ARM_HYPERCALLS_H
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#include <asm/kvm_emulate.h>
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int kvm_smccc_call_handler(struct kvm_vcpu *vcpu);
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static inline u32 smccc_get_function(struct kvm_vcpu *vcpu)
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{
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return vcpu_get_reg(vcpu, 0);
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}
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static inline unsigned long smccc_get_arg1(struct kvm_vcpu *vcpu)
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{
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return vcpu_get_reg(vcpu, 1);
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}
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static inline unsigned long smccc_get_arg2(struct kvm_vcpu *vcpu)
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{
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return vcpu_get_reg(vcpu, 2);
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}
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static inline unsigned long smccc_get_arg3(struct kvm_vcpu *vcpu)
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{
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return vcpu_get_reg(vcpu, 3);
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}
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static inline void smccc_set_retval(struct kvm_vcpu *vcpu,
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unsigned long a0,
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unsigned long a1,
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unsigned long a2,
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unsigned long a3)
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{
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vcpu_set_reg(vcpu, 0, a0);
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vcpu_set_reg(vcpu, 1, a1);
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vcpu_set_reg(vcpu, 2, a2);
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vcpu_set_reg(vcpu, 3, a3);
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}
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struct kvm_one_reg;
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void kvm_arm_init_hypercalls(struct kvm *kvm);
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void kvm_arm_teardown_hypercalls(struct kvm *kvm);
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int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu);
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int kvm_arm_copy_fw_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
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int kvm_arm_get_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
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int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
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int kvm_vm_smccc_has_attr(struct kvm *kvm, struct kvm_device_attr *attr);
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int kvm_vm_smccc_set_attr(struct kvm *kvm, struct kvm_device_attr *attr);
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#endif
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