| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2012,2013 - ARM Ltd |
| * Author: Marc Zyngier <marc.zyngier@arm.com> |
| * |
| * Derived from arch/arm/kvm/coproc.h |
| * Copyright (C) 2012 - Virtual Open Systems and Columbia University |
| * Authors: Christoffer Dall <c.dall@virtualopensystems.com> |
| */ |
| |
| #ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__ |
| #define __ARM64_KVM_SYS_REGS_LOCAL_H__ |
| |
| #include <linux/bsearch.h> |
| |
| #define reg_to_encoding(x) \ |
| sys_reg((u32)(x)->Op0, (u32)(x)->Op1, \ |
| (u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2) |
| |
| struct sys_reg_params { |
| u8 Op0; |
| u8 Op1; |
| u8 CRn; |
| u8 CRm; |
| u8 Op2; |
| u64 regval; |
| bool is_write; |
| }; |
| |
| #define esr_sys64_to_params(esr) \ |
| ((struct sys_reg_params){ .Op0 = ((esr) >> 20) & 3, \ |
| .Op1 = ((esr) >> 14) & 0x7, \ |
| .CRn = ((esr) >> 10) & 0xf, \ |
| .CRm = ((esr) >> 1) & 0xf, \ |
| .Op2 = ((esr) >> 17) & 0x7, \ |
| .is_write = !((esr) & 1) }) |
| |
| #define esr_cp1x_32_to_params(esr) \ |
| ((struct sys_reg_params){ .Op1 = ((esr) >> 14) & 0x7, \ |
| .CRn = ((esr) >> 10) & 0xf, \ |
| .CRm = ((esr) >> 1) & 0xf, \ |
| .Op2 = ((esr) >> 17) & 0x7, \ |
| .is_write = !((esr) & 1) }) |
| |
| struct sys_reg_desc { |
| /* Sysreg string for debug */ |
| const char *name; |
| |
| enum { |
| AA32_DIRECT, |
| AA32_LO, |
| AA32_HI, |
| } aarch32_map; |
| |
| /* MRS/MSR instruction which accesses it. */ |
| u8 Op0; |
| u8 Op1; |
| u8 CRn; |
| u8 CRm; |
| u8 Op2; |
| |
| /* Trapped access from guest, if non-NULL. */ |
| bool (*access)(struct kvm_vcpu *, |
| struct sys_reg_params *, |
| const struct sys_reg_desc *); |
| |
| /* Initialization for vcpu. */ |
| void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *); |
| |
| /* Index into sys_reg[], or 0 if we don't need to save it. */ |
| int reg; |
| |
| /* Value (usually reset value) */ |
| u64 val; |
| |
| /* Custom get/set_user functions, fallback to generic if NULL */ |
| int (*get_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, |
| u64 *val); |
| int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, |
| u64 val); |
| |
| /* Return mask of REG_* runtime visibility overrides */ |
| unsigned int (*visibility)(const struct kvm_vcpu *vcpu, |
| const struct sys_reg_desc *rd); |
| }; |
| |
| #define REG_HIDDEN (1 << 0) /* hidden from userspace and guest */ |
| #define REG_RAZ (1 << 1) /* RAZ from userspace and guest */ |
| |
| static __printf(2, 3) |
| inline void print_sys_reg_msg(const struct sys_reg_params *p, |
| char *fmt, ...) |
| { |
| va_list va; |
| |
| va_start(va, fmt); |
| /* Look, we even formatted it for you to paste into the table! */ |
| kvm_pr_unimpl("%pV { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n", |
| &(struct va_format){ fmt, &va }, |
| p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read"); |
| va_end(va); |
| } |
| |
| static inline void print_sys_reg_instr(const struct sys_reg_params *p) |
| { |
| /* GCC warns on an empty format string */ |
| print_sys_reg_msg(p, "%s", ""); |
| } |
| |
| static inline bool ignore_write(struct kvm_vcpu *vcpu, |
| const struct sys_reg_params *p) |
| { |
| return true; |
| } |
| |
| static inline bool read_zero(struct kvm_vcpu *vcpu, |
| struct sys_reg_params *p) |
| { |
| p->regval = 0; |
| return true; |
| } |
| |
| /* Reset functions */ |
| static inline void reset_unknown(struct kvm_vcpu *vcpu, |
| const struct sys_reg_desc *r) |
| { |
| BUG_ON(!r->reg); |
| BUG_ON(r->reg >= NR_SYS_REGS); |
| __vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL; |
| } |
| |
| static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) |
| { |
| BUG_ON(!r->reg); |
| BUG_ON(r->reg >= NR_SYS_REGS); |
| __vcpu_sys_reg(vcpu, r->reg) = r->val; |
| } |
| |
| static inline bool sysreg_hidden(const struct kvm_vcpu *vcpu, |
| const struct sys_reg_desc *r) |
| { |
| if (likely(!r->visibility)) |
| return false; |
| |
| return r->visibility(vcpu, r) & REG_HIDDEN; |
| } |
| |
| static inline bool sysreg_visible_as_raz(const struct kvm_vcpu *vcpu, |
| const struct sys_reg_desc *r) |
| { |
| if (likely(!r->visibility)) |
| return false; |
| |
| return r->visibility(vcpu, r) & REG_RAZ; |
| } |
| |
| static inline int cmp_sys_reg(const struct sys_reg_desc *i1, |
| const struct sys_reg_desc *i2) |
| { |
| BUG_ON(i1 == i2); |
| if (!i1) |
| return 1; |
| else if (!i2) |
| return -1; |
| if (i1->Op0 != i2->Op0) |
| return i1->Op0 - i2->Op0; |
| if (i1->Op1 != i2->Op1) |
| return i1->Op1 - i2->Op1; |
| if (i1->CRn != i2->CRn) |
| return i1->CRn - i2->CRn; |
| if (i1->CRm != i2->CRm) |
| return i1->CRm - i2->CRm; |
| return i1->Op2 - i2->Op2; |
| } |
| |
| static inline int match_sys_reg(const void *key, const void *elt) |
| { |
| const unsigned long pval = (unsigned long)key; |
| const struct sys_reg_desc *r = elt; |
| |
| return pval - reg_to_encoding(r); |
| } |
| |
| static inline const struct sys_reg_desc * |
| find_reg(const struct sys_reg_params *params, const struct sys_reg_desc table[], |
| unsigned int num) |
| { |
| unsigned long pval = reg_to_encoding(params); |
| |
| return __inline_bsearch((void *)pval, table, num, sizeof(table[0]), match_sys_reg); |
| } |
| |
| const struct sys_reg_desc *get_reg_by_id(u64 id, |
| const struct sys_reg_desc table[], |
| unsigned int num); |
| |
| int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *); |
| int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *); |
| int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg, |
| const struct sys_reg_desc table[], unsigned int num); |
| int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg, |
| const struct sys_reg_desc table[], unsigned int num); |
| |
| #define AA32(_x) .aarch32_map = AA32_##_x |
| #define Op0(_x) .Op0 = _x |
| #define Op1(_x) .Op1 = _x |
| #define CRn(_x) .CRn = _x |
| #define CRm(_x) .CRm = _x |
| #define Op2(_x) .Op2 = _x |
| |
| #define SYS_DESC(reg) \ |
| .name = #reg, \ |
| Op0(sys_reg_Op0(reg)), Op1(sys_reg_Op1(reg)), \ |
| CRn(sys_reg_CRn(reg)), CRm(sys_reg_CRm(reg)), \ |
| Op2(sys_reg_Op2(reg)) |
| |
| #endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */ |