/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2012,2013 - ARM Ltd * Author: Marc Zyngier */ #ifndef __ARM_KVM_ASM_H__ #define __ARM_KVM_ASM_H__ #include #define VCPU_WORKAROUND_2_FLAG_SHIFT 0 #define VCPU_WORKAROUND_2_FLAG (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT) #define ARM_EXIT_WITH_SERROR_BIT 31 #define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT)) #define ARM_EXCEPTION_IS_TRAP(x) (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP) #define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT)) #define ARM_EXCEPTION_IRQ 0 #define ARM_EXCEPTION_EL1_SERROR 1 #define ARM_EXCEPTION_TRAP 2 #define ARM_EXCEPTION_IL 3 /* The hyp-stub will return this for any kvm_call_hyp() call */ #define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR #define kvm_arm_exception_type \ {ARM_EXCEPTION_IRQ, "IRQ" }, \ {ARM_EXCEPTION_EL1_SERROR, "SERROR" }, \ {ARM_EXCEPTION_TRAP, "TRAP" }, \ {ARM_EXCEPTION_HYP_GONE, "HYP_GONE" } /* * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code * that jumps over this. */ #define KVM_VECTOR_PREAMBLE (2 * AARCH64_INSN_SIZE) #ifndef __ASSEMBLY__ #include /* Translate a kernel address of @sym into its equivalent linear mapping */ #define kvm_ksym_ref(sym) \ ({ \ void *val = &sym; \ if (!is_kernel_in_hyp_mode()) \ val = lm_alias(&sym); \ val; \ }) struct kvm; struct kvm_vcpu; extern char __kvm_hyp_init[]; extern char __kvm_hyp_init_end[]; extern char __kvm_hyp_vector[]; extern void __kvm_flush_vm_context(void); extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); extern void __kvm_tlb_flush_vmid(struct kvm *kvm); extern void __kvm_flush_cpu_context(struct kvm_vcpu *vcpu); extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high); extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu); extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu); extern u64 __vgic_v3_get_ich_vtr_el2(void); extern u64 __vgic_v3_read_vmcr(void); extern void __vgic_v3_write_vmcr(u32 vmcr); extern void __vgic_v3_init_lrs(void); extern u32 __kvm_get_mdcr_el2(void); /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */ #define __hyp_this_cpu_ptr(sym) \ ({ \ void *__ptr = hyp_symbol_addr(sym); \ __ptr += read_sysreg(tpidr_el2); \ (typeof(&sym))__ptr; \ }) #define __hyp_this_cpu_read(sym) \ ({ \ *__hyp_this_cpu_ptr(sym); \ }) #define __KVM_EXTABLE(from, to) \ " .pushsection __kvm_ex_table, \"a\"\n" \ " .align 3\n" \ " .long (" #from " - .), (" #to " - .)\n" \ " .popsection\n" #define __kvm_at(at_op, addr) \ ( { \ int __kvm_at_err = 0; \ u64 spsr, elr; \ asm volatile( \ " mrs %1, spsr_el2\n" \ " mrs %2, elr_el2\n" \ "1: at "at_op", %3\n" \ " isb\n" \ " b 9f\n" \ "2: msr spsr_el2, %1\n" \ " msr elr_el2, %2\n" \ " mov %w0, %4\n" \ "9:\n" \ __KVM_EXTABLE(1b, 2b) \ : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \ : "r" (addr), "i" (-EFAULT)); \ __kvm_at_err; \ } ) #else /* __ASSEMBLY__ */ .macro hyp_adr_this_cpu reg, sym, tmp adr_l \reg, \sym mrs \tmp, tpidr_el2 add \reg, \reg, \tmp .endm .macro hyp_ldr_this_cpu reg, sym, tmp adr_l \reg, \sym mrs \tmp, tpidr_el2 ldr \reg, [\reg, \tmp] .endm .macro get_host_ctxt reg, tmp hyp_adr_this_cpu \reg, kvm_host_data, \tmp add \reg, \reg, #HOST_DATA_CONTEXT .endm .macro get_vcpu_ptr vcpu, ctxt get_host_ctxt \ctxt, \vcpu ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] kern_hyp_va \vcpu .endm /* * KVM extable for unexpected exceptions. * In the same format _asm_extable, but output to a different section so that * it can be mapped to EL2. The KVM version is not sorted. The caller must * ensure: * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup. */ .macro _kvm_extable, from, to .pushsection __kvm_ex_table, "a" .align 3 .long (\from - .), (\to - .) .popsection .endm #endif #endif /* __ARM_KVM_ASM_H__ */