linux/arch/arm/kvm/coproc.h
Marc Zyngier 3c1e716508 arm/arm64: KVM: Use set/way op trapping to track the state of the caches
Trying to emulate the behaviour of set/way cache ops is fairly
pointless, as there are too many ways we can end-up missing stuff.
Also, there is some system caches out there that simply ignore
set/way operations.

So instead of trying to implement them, let's convert it to VA ops,
and use them as a way to re-enable the trapping of VM ops. That way,
we can detect the point when the MMU/caches are turned off, and do
a full VM flush (which is what the guest was trying to do anyway).

This allows a 32bit zImage to boot on the APM thingy, and will
probably help bootloaders in general.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2015-01-29 23:24:56 +01:00

161 lines
4.1 KiB
C

/*
* 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, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __ARM_KVM_COPROC_LOCAL_H__
#define __ARM_KVM_COPROC_LOCAL_H__
struct coproc_params {
unsigned long CRn;
unsigned long CRm;
unsigned long Op1;
unsigned long Op2;
unsigned long Rt1;
unsigned long Rt2;
bool is_64bit;
bool is_write;
};
struct coproc_reg {
/* MRC/MCR/MRRC/MCRR instruction which accesses it. */
unsigned long CRn;
unsigned long CRm;
unsigned long Op1;
unsigned long Op2;
bool is_64;
/* Trapped access from guest, if non-NULL. */
bool (*access)(struct kvm_vcpu *,
const struct coproc_params *,
const struct coproc_reg *);
/* Initialization for vcpu. */
void (*reset)(struct kvm_vcpu *, const struct coproc_reg *);
/* Index into vcpu->arch.cp15[], or 0 if we don't need to save it. */
unsigned long reg;
/* Value (usually reset value) */
u64 val;
};
static inline void print_cp_instr(const struct coproc_params *p)
{
/* Look, we even formatted it for you to paste into the table! */
if (p->is_64bit) {
kvm_pr_unimpl(" { CRm64(%2lu), Op1(%2lu), is64, func_%s },\n",
p->CRn, p->Op1, p->is_write ? "write" : "read");
} else {
kvm_pr_unimpl(" { CRn(%2lu), CRm(%2lu), Op1(%2lu), Op2(%2lu), is32,"
" func_%s },\n",
p->CRn, p->CRm, p->Op1, p->Op2,
p->is_write ? "write" : "read");
}
}
static inline bool ignore_write(struct kvm_vcpu *vcpu,
const struct coproc_params *p)
{
return true;
}
static inline bool read_zero(struct kvm_vcpu *vcpu,
const struct coproc_params *p)
{
*vcpu_reg(vcpu, p->Rt1) = 0;
return true;
}
static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
const struct coproc_params *params)
{
kvm_debug("CP15 write to read-only register at: %08lx\n",
*vcpu_pc(vcpu));
print_cp_instr(params);
return false;
}
static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
const struct coproc_params *params)
{
kvm_debug("CP15 read to write-only register at: %08lx\n",
*vcpu_pc(vcpu));
print_cp_instr(params);
return false;
}
/* Reset functions */
static inline void reset_unknown(struct kvm_vcpu *vcpu,
const struct coproc_reg *r)
{
BUG_ON(!r->reg);
BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.cp15));
vcpu->arch.cp15[r->reg] = 0xdecafbad;
}
static inline void reset_val(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
{
BUG_ON(!r->reg);
BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.cp15));
vcpu->arch.cp15[r->reg] = r->val;
}
static inline void reset_unknown64(struct kvm_vcpu *vcpu,
const struct coproc_reg *r)
{
BUG_ON(!r->reg);
BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.cp15));
vcpu->arch.cp15[r->reg] = 0xdecafbad;
vcpu->arch.cp15[r->reg+1] = 0xd0c0ffee;
}
static inline int cmp_reg(const struct coproc_reg *i1,
const struct coproc_reg *i2)
{
BUG_ON(i1 == i2);
if (!i1)
return 1;
else if (!i2)
return -1;
if (i1->CRn != i2->CRn)
return i1->CRn - i2->CRn;
if (i1->CRm != i2->CRm)
return i1->CRm - i2->CRm;
if (i1->Op1 != i2->Op1)
return i1->Op1 - i2->Op1;
if (i1->Op2 != i2->Op2)
return i1->Op2 - i2->Op2;
return i2->is_64 - i1->is_64;
}
#define CRn(_x) .CRn = _x
#define CRm(_x) .CRm = _x
#define CRm64(_x) .CRn = _x, .CRm = 0
#define Op1(_x) .Op1 = _x
#define Op2(_x) .Op2 = _x
#define is64 .is_64 = true
#define is32 .is_64 = false
bool access_vm_reg(struct kvm_vcpu *vcpu,
const struct coproc_params *p,
const struct coproc_reg *r);
#endif /* __ARM_KVM_COPROC_LOCAL_H__ */