54771e6217
When reading and writing SPRs, every SPR emulation piece had to read or write the respective GPR the value was read from or stored in itself. This approach is pretty prone to failure. What if we accidentally implement mfspr emulation where we just do "break" and nothing else? Suddenly we would get a random value in the return register - which is always a bad idea. So let's consolidate the generic code paths and only give the core specific SPR handling code readily made variables to read/write from/to. Functionally, this patch doesn't change anything, but it increases the readability of the code and makes is less prone to bugs. Signed-off-by: Alexander Graf <agraf@suse.de>
130 lines
4.2 KiB
C
130 lines
4.2 KiB
C
/*
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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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* Copyright IBM Corp. 2008
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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*/
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#ifndef __KVM_BOOKE_H__
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#define __KVM_BOOKE_H__
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#include <linux/types.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_ppc.h>
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#include <asm/switch_to.h>
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#include "timing.h"
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/* interrupt priortity ordering */
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#define BOOKE_IRQPRIO_DATA_STORAGE 0
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#define BOOKE_IRQPRIO_INST_STORAGE 1
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#define BOOKE_IRQPRIO_ALIGNMENT 2
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#define BOOKE_IRQPRIO_PROGRAM 3
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#define BOOKE_IRQPRIO_FP_UNAVAIL 4
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#define BOOKE_IRQPRIO_SPE_UNAVAIL 5
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#define BOOKE_IRQPRIO_SPE_FP_DATA 6
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#define BOOKE_IRQPRIO_SPE_FP_ROUND 7
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#define BOOKE_IRQPRIO_SYSCALL 8
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#define BOOKE_IRQPRIO_AP_UNAVAIL 9
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#define BOOKE_IRQPRIO_DTLB_MISS 10
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#define BOOKE_IRQPRIO_ITLB_MISS 11
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#define BOOKE_IRQPRIO_MACHINE_CHECK 12
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#define BOOKE_IRQPRIO_DEBUG 13
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#define BOOKE_IRQPRIO_CRITICAL 14
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#define BOOKE_IRQPRIO_WATCHDOG 15
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#define BOOKE_IRQPRIO_EXTERNAL 16
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#define BOOKE_IRQPRIO_FIT 17
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#define BOOKE_IRQPRIO_DECREMENTER 18
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#define BOOKE_IRQPRIO_PERFORMANCE_MONITOR 19
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/* Internal pseudo-irqprio for level triggered externals */
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#define BOOKE_IRQPRIO_EXTERNAL_LEVEL 20
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#define BOOKE_IRQPRIO_DBELL 21
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#define BOOKE_IRQPRIO_DBELL_CRIT 22
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#define BOOKE_IRQPRIO_MAX 23
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#define BOOKE_IRQMASK_EE ((1 << BOOKE_IRQPRIO_EXTERNAL_LEVEL) | \
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(1 << BOOKE_IRQPRIO_PERFORMANCE_MONITOR) | \
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(1 << BOOKE_IRQPRIO_DBELL) | \
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(1 << BOOKE_IRQPRIO_DECREMENTER) | \
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(1 << BOOKE_IRQPRIO_FIT) | \
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(1 << BOOKE_IRQPRIO_EXTERNAL))
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#define BOOKE_IRQMASK_CE ((1 << BOOKE_IRQPRIO_DBELL_CRIT) | \
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(1 << BOOKE_IRQPRIO_WATCHDOG) | \
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(1 << BOOKE_IRQPRIO_CRITICAL))
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extern unsigned long kvmppc_booke_handlers;
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void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr);
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void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr);
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void kvmppc_set_tcr(struct kvm_vcpu *vcpu, u32 new_tcr);
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void kvmppc_set_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits);
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void kvmppc_clr_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits);
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int kvmppc_booke_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
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unsigned int inst, int *advance);
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int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val);
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int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val);
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/* low-level asm code to transfer guest state */
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void kvmppc_load_guest_spe(struct kvm_vcpu *vcpu);
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void kvmppc_save_guest_spe(struct kvm_vcpu *vcpu);
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/* high-level function, manages flags, host state */
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void kvmppc_vcpu_disable_spe(struct kvm_vcpu *vcpu);
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void kvmppc_booke_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
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void kvmppc_booke_vcpu_put(struct kvm_vcpu *vcpu);
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enum int_class {
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INT_CLASS_NONCRIT,
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INT_CLASS_CRIT,
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INT_CLASS_MC,
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INT_CLASS_DBG,
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};
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void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type);
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/*
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* Load up guest vcpu FP state if it's needed.
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* It also set the MSR_FP in thread so that host know
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* we're holding FPU, and then host can help to save
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* guest vcpu FP state if other threads require to use FPU.
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* This simulates an FP unavailable fault.
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*
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* It requires to be called with preemption disabled.
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*/
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static inline void kvmppc_load_guest_fp(struct kvm_vcpu *vcpu)
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{
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#ifdef CONFIG_PPC_FPU
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if (vcpu->fpu_active && !(current->thread.regs->msr & MSR_FP)) {
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load_up_fpu();
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current->thread.regs->msr |= MSR_FP;
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}
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#endif
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}
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/*
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* Save guest vcpu FP state into thread.
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* It requires to be called with preemption disabled.
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*/
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static inline void kvmppc_save_guest_fp(struct kvm_vcpu *vcpu)
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{
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#ifdef CONFIG_PPC_FPU
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if (vcpu->fpu_active && (current->thread.regs->msr & MSR_FP))
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giveup_fpu(current);
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#endif
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}
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#endif /* __KVM_BOOKE_H__ */
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