199 lines
5.6 KiB
C
199 lines
5.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012,2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*/
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#ifndef __ARM_KVM_ASM_H__
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#define __ARM_KVM_ASM_H__
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#include <asm/virt.h>
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#define VCPU_WORKAROUND_2_FLAG_SHIFT 0
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#define VCPU_WORKAROUND_2_FLAG (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
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#define ARM_EXIT_WITH_SERROR_BIT 31
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#define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
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#define ARM_EXCEPTION_IS_TRAP(x) (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP)
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#define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
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#define ARM_EXCEPTION_IRQ 0
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#define ARM_EXCEPTION_EL1_SERROR 1
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#define ARM_EXCEPTION_TRAP 2
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#define ARM_EXCEPTION_IL 3
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/* The hyp-stub will return this for any kvm_call_hyp() call */
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#define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR
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#define kvm_arm_exception_type \
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{ARM_EXCEPTION_IRQ, "IRQ" }, \
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{ARM_EXCEPTION_EL1_SERROR, "SERROR" }, \
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{ARM_EXCEPTION_TRAP, "TRAP" }, \
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{ARM_EXCEPTION_HYP_GONE, "HYP_GONE" }
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/*
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* Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code
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* that jumps over this.
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*/
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#define KVM_VECTOR_PREAMBLE (2 * AARCH64_INSN_SIZE)
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#define __SMCCC_WORKAROUND_1_SMC_SZ 36
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#ifndef __ASSEMBLY__
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#include <linux/mm.h>
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/*
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* Translate name of a symbol defined in nVHE hyp to the name seen
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* by kernel proper. All nVHE symbols are prefixed by the build system
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* to avoid clashes with the VHE variants.
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*/
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#define kvm_nvhe_sym(sym) __kvm_nvhe_##sym
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#define DECLARE_KVM_VHE_SYM(sym) extern char sym[]
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#define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[]
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/*
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* Define a pair of symbols sharing the same name but one defined in
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* VHE and the other in nVHE hyp implementations.
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*/
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#define DECLARE_KVM_HYP_SYM(sym) \
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DECLARE_KVM_VHE_SYM(sym); \
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DECLARE_KVM_NVHE_SYM(sym)
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#define CHOOSE_VHE_SYM(sym) sym
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#define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym)
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#ifndef __KVM_NVHE_HYPERVISOR__
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/*
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* BIG FAT WARNINGS:
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*
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* - Don't be tempted to change the following is_kernel_in_hyp_mode()
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* to has_vhe(). has_vhe() is implemented as a *final* capability,
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* while this is used early at boot time, when the capabilities are
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* not final yet....
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*
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* - Don't let the nVHE hypervisor have access to this, as it will
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* pick the *wrong* symbol (yes, it runs at EL2...).
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*/
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#define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() ? CHOOSE_VHE_SYM(sym) \
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: CHOOSE_NVHE_SYM(sym))
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#else
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/* The nVHE hypervisor shouldn't even try to access anything */
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extern void *__nvhe_undefined_symbol;
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#define CHOOSE_HYP_SYM(sym) __nvhe_undefined_symbol
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#endif
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/* Translate a kernel address @ptr into its equivalent linear mapping */
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#define kvm_ksym_ref(ptr) \
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({ \
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void *val = (ptr); \
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if (!is_kernel_in_hyp_mode()) \
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val = lm_alias((ptr)); \
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val; \
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})
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#define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym))
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struct kvm;
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struct kvm_vcpu;
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struct kvm_s2_mmu;
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DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
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DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
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#define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init)
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#define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector)
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#ifdef CONFIG_KVM_INDIRECT_VECTORS
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extern atomic_t arm64_el2_vector_last_slot;
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DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs);
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#define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs)
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#endif
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extern void __kvm_flush_vm_context(void);
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extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa,
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int level);
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extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu);
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extern void __kvm_tlb_flush_local_vmid(struct kvm_s2_mmu *mmu);
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extern void __kvm_timer_set_cntvoff(u64 cntvoff);
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extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
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extern void __kvm_enable_ssbs(void);
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extern u64 __vgic_v3_get_ich_vtr_el2(void);
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extern u64 __vgic_v3_read_vmcr(void);
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extern void __vgic_v3_write_vmcr(u32 vmcr);
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extern void __vgic_v3_init_lrs(void);
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extern u32 __kvm_get_mdcr_el2(void);
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extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];
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/*
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* Obtain the PC-relative address of a kernel symbol
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* s: symbol
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*
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* The goal of this macro is to return a symbol's address based on a
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* PC-relative computation, as opposed to a loading the VA from a
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* constant pool or something similar. This works well for HYP, as an
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* absolute VA is guaranteed to be wrong. Only use this if trying to
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* obtain the address of a symbol (i.e. not something you obtained by
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* following a pointer).
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*/
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#define hyp_symbol_addr(s) \
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({ \
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typeof(s) *addr; \
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asm("adrp %0, %1\n" \
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"add %0, %0, :lo12:%1\n" \
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: "=r" (addr) : "S" (&s)); \
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addr; \
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})
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/*
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* Home-grown __this_cpu_{ptr,read} variants that always work at HYP,
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* provided that sym is really a *symbol* and not a pointer obtained from
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* a data structure. As for SHIFT_PERCPU_PTR(), the creative casting keeps
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* sparse quiet.
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*/
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#define __hyp_this_cpu_ptr(sym) \
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({ \
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void *__ptr; \
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__verify_pcpu_ptr(&sym); \
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__ptr = hyp_symbol_addr(sym); \
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__ptr += read_sysreg(tpidr_el2); \
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(typeof(sym) __kernel __force *)__ptr; \
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})
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#define __hyp_this_cpu_read(sym) \
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({ \
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*__hyp_this_cpu_ptr(sym); \
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})
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#else /* __ASSEMBLY__ */
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.macro hyp_adr_this_cpu reg, sym, tmp
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adr_l \reg, \sym
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mrs \tmp, tpidr_el2
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add \reg, \reg, \tmp
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.endm
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.macro hyp_ldr_this_cpu reg, sym, tmp
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adr_l \reg, \sym
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mrs \tmp, tpidr_el2
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ldr \reg, [\reg, \tmp]
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.endm
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.macro get_host_ctxt reg, tmp
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hyp_adr_this_cpu \reg, kvm_host_data, \tmp
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add \reg, \reg, #HOST_DATA_CONTEXT
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.endm
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.macro get_vcpu_ptr vcpu, ctxt
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get_host_ctxt \ctxt, \vcpu
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ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
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.endm
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#endif
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#endif /* __ARM_KVM_ASM_H__ */
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