/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2015 - ARM Ltd * Author: Marc Zyngier */ #ifndef __ARM64_KVM_HYP_H__ #define __ARM64_KVM_HYP_H__ #include #include #include #include #include #define __hyp_text __section(.hyp.text) notrace #define read_sysreg_elx(r,nvh,vh) \ ({ \ u64 reg; \ asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\ __mrs_s("%0", r##vh), \ ARM64_HAS_VIRT_HOST_EXTN) \ : "=r" (reg)); \ reg; \ }) #define write_sysreg_elx(v,r,nvh,vh) \ do { \ u64 __val = (u64)(v); \ asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\ __msr_s(r##vh, "%x0"), \ ARM64_HAS_VIRT_HOST_EXTN) \ : : "rZ" (__val)); \ } while (0) /* * Unified accessors for registers that have a different encoding * between VHE and non-VHE. They must be specified without their "ELx" * encoding. */ #define read_sysreg_el2(r) \ ({ \ u64 reg; \ asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\ "mrs %0, " __stringify(r##_EL1),\ ARM64_HAS_VIRT_HOST_EXTN) \ : "=r" (reg)); \ reg; \ }) #define write_sysreg_el2(v,r) \ do { \ u64 __val = (u64)(v); \ asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\ "msr " __stringify(r##_EL1) ", %x0",\ ARM64_HAS_VIRT_HOST_EXTN) \ : : "rZ" (__val)); \ } while (0) #define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02) #define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02) #define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12) #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12) /* The VHE specific system registers and their encoding */ #define sctlr_EL12 sys_reg(3, 5, 1, 0, 0) #define cpacr_EL12 sys_reg(3, 5, 1, 0, 2) #define ttbr0_EL12 sys_reg(3, 5, 2, 0, 0) #define ttbr1_EL12 sys_reg(3, 5, 2, 0, 1) #define tcr_EL12 sys_reg(3, 5, 2, 0, 2) #define afsr0_EL12 sys_reg(3, 5, 5, 1, 0) #define afsr1_EL12 sys_reg(3, 5, 5, 1, 1) #define esr_EL12 sys_reg(3, 5, 5, 2, 0) #define far_EL12 sys_reg(3, 5, 6, 0, 0) #define mair_EL12 sys_reg(3, 5, 10, 2, 0) #define amair_EL12 sys_reg(3, 5, 10, 3, 0) #define vbar_EL12 sys_reg(3, 5, 12, 0, 0) #define contextidr_EL12 sys_reg(3, 5, 13, 0, 1) #define cntkctl_EL12 sys_reg(3, 5, 14, 1, 0) #define cntp_tval_EL02 sys_reg(3, 5, 14, 2, 0) #define cntp_ctl_EL02 sys_reg(3, 5, 14, 2, 1) #define cntp_cval_EL02 sys_reg(3, 5, 14, 2, 2) #define cntv_tval_EL02 sys_reg(3, 5, 14, 3, 0) #define cntv_ctl_EL02 sys_reg(3, 5, 14, 3, 1) #define cntv_cval_EL02 sys_reg(3, 5, 14, 3, 2) #define spsr_EL12 sys_reg(3, 5, 4, 0, 0) #define elr_EL12 sys_reg(3, 5, 4, 0, 1) /** * hyp_alternate_select - Generates patchable code sequences that are * used to switch between two implementations of a function, depending * on the availability of a feature. * * @fname: a symbol name that will be defined as a function returning a * function pointer whose type will match @orig and @alt * @orig: A pointer to the default function, as returned by @fname when * @cond doesn't hold * @alt: A pointer to the alternate function, as returned by @fname * when @cond holds * @cond: a CPU feature (as described in asm/cpufeature.h) */ #define hyp_alternate_select(fname, orig, alt, cond) \ typeof(orig) * __hyp_text fname(void) \ { \ typeof(alt) *val = orig; \ asm volatile(ALTERNATIVE("nop \n", \ "mov %0, %1 \n", \ cond) \ : "+r" (val) : "r" (alt)); \ return val; \ } int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu); void __vgic_v3_save_state(struct kvm_vcpu *vcpu); void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); void __vgic_v3_activate_traps(struct kvm_vcpu *vcpu); void __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu); void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu); void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu); int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu); void __timer_enable_traps(struct kvm_vcpu *vcpu); void __timer_disable_traps(struct kvm_vcpu *vcpu); void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt); void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt); void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt); void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt); void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt); void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt); void __sysreg32_save_state(struct kvm_vcpu *vcpu); void __sysreg32_restore_state(struct kvm_vcpu *vcpu); void __debug_switch_to_guest(struct kvm_vcpu *vcpu); void __debug_switch_to_host(struct kvm_vcpu *vcpu); void __fpsimd_save_state(struct user_fpsimd_state *fp_regs); void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs); void activate_traps_vhe_load(struct kvm_vcpu *vcpu); void deactivate_traps_vhe_put(void); u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt); void __noreturn __hyp_do_panic(unsigned long, ...); /* * Must be called from hyp code running at EL2 with an updated VTTBR * and interrupts disabled. */ static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm) { write_sysreg(kvm->arch.vtcr, vtcr_el2); write_sysreg(kvm_get_vttbr(kvm), vttbr_el2); /* * ARM erratum 1165522 requires the actual execution of the above * before we can switch to the EL1/EL0 translation regime used by * the guest. */ asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_1165522)); } #endif /* __ARM64_KVM_HYP_H__ */