599d79dcd1
We're pretty blind when it comes to system register tracing, and rely on the ESR value displayed by kvm_handle_sys, which isn't much. Instead, let's add an actual name to the sysreg entries, so that we can finally print it as we're about to perform the access itself. The new tracepoint is conveniently called kvm_sys_access. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
142 lines
3.7 KiB
C
142 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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/* Sysreg string for debug */
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const char *name;
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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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.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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#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */
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