forked from Minki/linux
7b5b4df1a7
Reads from write-only system registers are generally confined to EL1 and not propagated to EL2 (that's what the architecture mantates). In order to be sure that we have a sane behaviour even in the unlikely event that we have a broken system, we still handle it in KVM. In that case, let's inject an undef into the guest. Let's also remove write_to_read_only which isn't used anywhere. Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__
|
|
#define __ARM64_KVM_SYS_REGS_LOCAL_H__
|
|
|
|
struct sys_reg_params {
|
|
u8 Op0;
|
|
u8 Op1;
|
|
u8 CRn;
|
|
u8 CRm;
|
|
u8 Op2;
|
|
u64 regval;
|
|
bool is_write;
|
|
bool is_aarch32;
|
|
bool is_32bit; /* Only valid if is_aarch32 is true */
|
|
};
|
|
|
|
struct sys_reg_desc {
|
|
/* 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,
|
|
const struct kvm_one_reg *reg, void __user *uaddr);
|
|
int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
|
|
const struct kvm_one_reg *reg, void __user *uaddr);
|
|
};
|
|
|
|
static inline void print_sys_reg_instr(const struct sys_reg_params *p)
|
|
{
|
|
/* Look, we even formatted it for you to paste into the table! */
|
|
kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
|
|
p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
|
|
}
|
|
|
|
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 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;
|
|
}
|
|
|
|
const struct sys_reg_desc *find_reg_by_id(u64 id,
|
|
struct sys_reg_params *params,
|
|
const struct sys_reg_desc table[],
|
|
unsigned int num);
|
|
|
|
#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
|
|
|
|
#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */
|