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8d404c4c24
Currently we access the system registers array via the vcpu_sys_reg() macro. However, we are about to change the behavior to some times modify the register file directly, so let's change this to two primitives: * Accessor macros vcpu_write_sys_reg() and vcpu_read_sys_reg() * Direct array access macro __vcpu_sys_reg() The accessor macros should be used in places where the code needs to access the currently loaded VCPU's state as observed by the guest. For example, when trapping on cache related registers, a write to a system register should go directly to the VCPU version of the register. The direct array access macro can be used in places where the VCPU is known to never be running (for example userspace access) or for registers which are never context switched (for example all the PMU system registers). This rewrites all users of vcpu_sys_regs to one of the macros described above. No functional change. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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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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bool is_aarch32;
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bool is_32bit; /* Only valid if is_aarch32 is true */
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};
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struct sys_reg_desc {
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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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/* Initialization for vcpu. */
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void (*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) */
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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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const struct kvm_one_reg *reg, void __user *uaddr);
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int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
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const struct kvm_one_reg *reg, void __user *uaddr);
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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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/* Look, we even formatted it for you to paste into the table! */
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kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
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p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
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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 void 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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}
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static inline void 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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}
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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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const struct sys_reg_desc *find_reg_by_id(u64 id,
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struct sys_reg_params *params,
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const struct sys_reg_desc table[],
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unsigned int num);
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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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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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#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */
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