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3c1e716508
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>
161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/*
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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, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __ARM_KVM_COPROC_LOCAL_H__
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#define __ARM_KVM_COPROC_LOCAL_H__
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struct coproc_params {
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unsigned long CRn;
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unsigned long CRm;
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unsigned long Op1;
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unsigned long Op2;
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unsigned long Rt1;
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unsigned long Rt2;
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bool is_64bit;
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bool is_write;
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};
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struct coproc_reg {
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/* MRC/MCR/MRRC/MCRR instruction which accesses it. */
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unsigned long CRn;
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unsigned long CRm;
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unsigned long Op1;
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unsigned long Op2;
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bool is_64;
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/* Trapped access from guest, if non-NULL. */
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bool (*access)(struct kvm_vcpu *,
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const struct coproc_params *,
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const struct coproc_reg *);
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/* Initialization for vcpu. */
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void (*reset)(struct kvm_vcpu *, const struct coproc_reg *);
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/* Index into vcpu->arch.cp15[], or 0 if we don't need to save it. */
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unsigned long reg;
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/* Value (usually reset value) */
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u64 val;
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};
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static inline void print_cp_instr(const struct coproc_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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if (p->is_64bit) {
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kvm_pr_unimpl(" { CRm64(%2lu), Op1(%2lu), is64, func_%s },\n",
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p->CRn, p->Op1, p->is_write ? "write" : "read");
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} else {
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kvm_pr_unimpl(" { CRn(%2lu), CRm(%2lu), Op1(%2lu), Op2(%2lu), is32,"
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" func_%s },\n",
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p->CRn, p->CRm, p->Op1, p->Op2,
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p->is_write ? "write" : "read");
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}
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}
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static inline bool ignore_write(struct kvm_vcpu *vcpu,
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const struct coproc_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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const struct coproc_params *p)
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{
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*vcpu_reg(vcpu, p->Rt1) = 0;
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return true;
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}
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static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
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const struct coproc_params *params)
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{
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kvm_debug("CP15 write to read-only register at: %08lx\n",
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*vcpu_pc(vcpu));
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print_cp_instr(params);
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return false;
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}
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static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
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const struct coproc_params *params)
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{
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kvm_debug("CP15 read to write-only register at: %08lx\n",
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*vcpu_pc(vcpu));
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print_cp_instr(params);
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return false;
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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 coproc_reg *r)
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{
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BUG_ON(!r->reg);
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BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.cp15));
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vcpu->arch.cp15[r->reg] = 0xdecafbad;
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}
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static inline void reset_val(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
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{
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BUG_ON(!r->reg);
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BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.cp15));
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vcpu->arch.cp15[r->reg] = r->val;
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}
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static inline void reset_unknown64(struct kvm_vcpu *vcpu,
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const struct coproc_reg *r)
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{
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BUG_ON(!r->reg);
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BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.cp15));
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vcpu->arch.cp15[r->reg] = 0xdecafbad;
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vcpu->arch.cp15[r->reg+1] = 0xd0c0ffee;
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}
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static inline int cmp_reg(const struct coproc_reg *i1,
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const struct coproc_reg *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->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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if (i1->Op1 != i2->Op1)
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return i1->Op1 - i2->Op1;
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if (i1->Op2 != i2->Op2)
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return i1->Op2 - i2->Op2;
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return i2->is_64 - i1->is_64;
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}
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#define CRn(_x) .CRn = _x
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#define CRm(_x) .CRm = _x
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#define CRm64(_x) .CRn = _x, .CRm = 0
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#define Op1(_x) .Op1 = _x
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#define Op2(_x) .Op2 = _x
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#define is64 .is_64 = true
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#define is32 .is_64 = false
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bool access_vm_reg(struct kvm_vcpu *vcpu,
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const struct coproc_params *p,
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const struct coproc_reg *r);
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#endif /* __ARM_KVM_COPROC_LOCAL_H__ */
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