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17a0005644
* kvm-arm64/visibility-cleanups:
: .
: Remove REG_HIDDEN_USER from the sysreg infrastructure, making things
: a little more simple. From the cover letter:
:
: "Since 4d4f52052b ("KVM: arm64: nv: Drop EL12 register traps that are
: redirected to VNCR") and the admission that KVM would never be supporting
: the original FEAT_NV, REG_HIDDEN_USER only had a few users, all of which
: could either be replaced by a more ad-hoc mechanism, or removed altogether."
: .
KVM: arm64: Get rid of REG_HIDDEN_USER visibility qualifier
KVM: arm64: Simplify visibility handling of AArch32 SPSR_*
KVM: arm64: Simplify handling of CNTKCTL_EL12
Signed-off-by: Marc Zyngier <maz@kernel.org>
250 lines
6.8 KiB
C
250 lines
6.8 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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* Derived from arch/arm/kvm/coproc.h
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Authors: Christoffer Dall <c.dall@virtualopensystems.com>
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*/
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#ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__
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#define __ARM64_KVM_SYS_REGS_LOCAL_H__
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#include <linux/bsearch.h>
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#define reg_to_encoding(x) \
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sys_reg((u32)(x)->Op0, (u32)(x)->Op1, \
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(u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2)
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struct sys_reg_params {
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u8 Op0;
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u8 Op1;
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u8 CRn;
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u8 CRm;
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u8 Op2;
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u64 regval;
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bool is_write;
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};
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#define encoding_to_params(reg) \
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((struct sys_reg_params){ .Op0 = sys_reg_Op0(reg), \
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.Op1 = sys_reg_Op1(reg), \
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.CRn = sys_reg_CRn(reg), \
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.CRm = sys_reg_CRm(reg), \
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.Op2 = sys_reg_Op2(reg) })
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#define esr_sys64_to_params(esr) \
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((struct sys_reg_params){ .Op0 = ((esr) >> 20) & 3, \
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.Op1 = ((esr) >> 14) & 0x7, \
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.CRn = ((esr) >> 10) & 0xf, \
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.CRm = ((esr) >> 1) & 0xf, \
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.Op2 = ((esr) >> 17) & 0x7, \
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.is_write = !((esr) & 1) })
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#define esr_cp1x_32_to_params(esr) \
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((struct sys_reg_params){ .Op1 = ((esr) >> 14) & 0x7, \
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.CRn = ((esr) >> 10) & 0xf, \
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.CRm = ((esr) >> 1) & 0xf, \
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.Op2 = ((esr) >> 17) & 0x7, \
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.is_write = !((esr) & 1) })
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struct sys_reg_desc {
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/* Sysreg string for debug */
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const char *name;
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enum {
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AA32_DIRECT,
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AA32_LO,
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AA32_HI,
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} aarch32_map;
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/* MRS/MSR instruction which accesses it. */
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u8 Op0;
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u8 Op1;
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u8 CRn;
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u8 CRm;
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u8 Op2;
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/* Trapped access from guest, if non-NULL. */
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bool (*access)(struct kvm_vcpu *,
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struct sys_reg_params *,
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const struct sys_reg_desc *);
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/*
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* Initialization for vcpu. Return initialized value, or KVM
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* sanitized value for ID registers.
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*/
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u64 (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *);
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/* Index into sys_reg[], or 0 if we don't need to save it. */
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int reg;
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/* Value (usually reset value), or write mask for idregs */
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u64 val;
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/* Custom get/set_user functions, fallback to generic if NULL */
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int (*get_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
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u64 *val);
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int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
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u64 val);
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/* Return mask of REG_* runtime visibility overrides */
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unsigned int (*visibility)(const struct kvm_vcpu *vcpu,
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const struct sys_reg_desc *rd);
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};
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#define REG_HIDDEN (1 << 0) /* hidden from userspace and guest */
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#define REG_RAZ (1 << 1) /* RAZ from userspace and guest */
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#define REG_USER_WI (1 << 2) /* WI from userspace only */
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static __printf(2, 3)
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inline void print_sys_reg_msg(const struct sys_reg_params *p,
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char *fmt, ...)
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{
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va_list va;
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va_start(va, fmt);
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/* Look, we even formatted it for you to paste into the table! */
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kvm_pr_unimpl("%pV { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
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&(struct va_format){ fmt, &va },
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p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
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va_end(va);
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}
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static inline void print_sys_reg_instr(const struct sys_reg_params *p)
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{
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/* GCC warns on an empty format string */
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print_sys_reg_msg(p, "%s", "");
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}
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static inline bool ignore_write(struct kvm_vcpu *vcpu,
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const struct sys_reg_params *p)
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{
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return true;
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}
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static inline bool read_zero(struct kvm_vcpu *vcpu,
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struct sys_reg_params *p)
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{
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p->regval = 0;
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return true;
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}
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/* Reset functions */
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static inline u64 reset_unknown(struct kvm_vcpu *vcpu,
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const struct sys_reg_desc *r)
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{
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BUG_ON(!r->reg);
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BUG_ON(r->reg >= NR_SYS_REGS);
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__vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
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return __vcpu_sys_reg(vcpu, r->reg);
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}
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static inline u64 reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
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{
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BUG_ON(!r->reg);
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BUG_ON(r->reg >= NR_SYS_REGS);
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__vcpu_sys_reg(vcpu, r->reg) = r->val;
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return __vcpu_sys_reg(vcpu, r->reg);
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}
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static inline unsigned int sysreg_visibility(const struct kvm_vcpu *vcpu,
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const struct sys_reg_desc *r)
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{
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if (likely(!r->visibility))
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return 0;
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return r->visibility(vcpu, r);
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}
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static inline bool sysreg_hidden(const struct kvm_vcpu *vcpu,
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const struct sys_reg_desc *r)
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{
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return sysreg_visibility(vcpu, r) & REG_HIDDEN;
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}
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static inline bool sysreg_visible_as_raz(const struct kvm_vcpu *vcpu,
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const struct sys_reg_desc *r)
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{
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return sysreg_visibility(vcpu, r) & REG_RAZ;
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}
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static inline bool sysreg_user_write_ignore(const struct kvm_vcpu *vcpu,
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const struct sys_reg_desc *r)
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{
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return sysreg_visibility(vcpu, r) & REG_USER_WI;
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}
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static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
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const struct sys_reg_desc *i2)
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{
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BUG_ON(i1 == i2);
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if (!i1)
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return 1;
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else if (!i2)
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return -1;
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if (i1->Op0 != i2->Op0)
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return i1->Op0 - i2->Op0;
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if (i1->Op1 != i2->Op1)
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return i1->Op1 - i2->Op1;
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if (i1->CRn != i2->CRn)
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return i1->CRn - i2->CRn;
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if (i1->CRm != i2->CRm)
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return i1->CRm - i2->CRm;
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return i1->Op2 - i2->Op2;
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}
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static inline int match_sys_reg(const void *key, const void *elt)
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{
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const unsigned long pval = (unsigned long)key;
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const struct sys_reg_desc *r = elt;
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return pval - reg_to_encoding(r);
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}
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static inline const struct sys_reg_desc *
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find_reg(const struct sys_reg_params *params, const struct sys_reg_desc table[],
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unsigned int num)
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{
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unsigned long pval = reg_to_encoding(params);
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return __inline_bsearch((void *)pval, table, num, sizeof(table[0]), match_sys_reg);
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}
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const struct sys_reg_desc *get_reg_by_id(u64 id,
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const struct sys_reg_desc table[],
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unsigned int num);
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int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
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int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
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int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
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const struct sys_reg_desc table[], unsigned int num);
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int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
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const struct sys_reg_desc table[], unsigned int num);
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bool triage_sysreg_trap(struct kvm_vcpu *vcpu, int *sr_index);
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int kvm_finalize_sys_regs(struct kvm_vcpu *vcpu);
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#define AA32(_x) .aarch32_map = AA32_##_x
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#define Op0(_x) .Op0 = _x
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#define Op1(_x) .Op1 = _x
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#define CRn(_x) .CRn = _x
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#define CRm(_x) .CRm = _x
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#define Op2(_x) .Op2 = _x
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#define SYS_DESC(reg) \
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.name = #reg, \
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Op0(sys_reg_Op0(reg)), Op1(sys_reg_Op1(reg)), \
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CRn(sys_reg_CRn(reg)), CRm(sys_reg_CRm(reg)), \
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Op2(sys_reg_Op2(reg))
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#define CP15_SYS_DESC(reg) \
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.name = #reg, \
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.aarch32_map = AA32_DIRECT, \
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Op0(0), Op1(sys_reg_Op1(reg)), \
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CRn(sys_reg_CRn(reg)), CRm(sys_reg_CRm(reg)), \
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Op2(sys_reg_Op2(reg))
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#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */
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