diff options
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/include/asm/cpu-info.h | 1 | ||||
| -rw-r--r-- | arch/mips/include/asm/kvm_host.h | 42 | ||||
| -rw-r--r-- | arch/mips/kernel/time.c | 1 | ||||
| -rw-r--r-- | arch/mips/kvm/interrupt.h | 5 | ||||
| -rw-r--r-- | arch/mips/kvm/mips.c | 5 | ||||
| -rw-r--r-- | arch/mips/kvm/mmu.c | 20 | ||||
| -rw-r--r-- | arch/mips/kvm/tlb.c | 7 | ||||
| -rw-r--r-- | arch/mips/kvm/trace.h | 15 | ||||
| -rw-r--r-- | arch/mips/kvm/vz.c | 2381 |
9 files changed, 2477 insertions, 0 deletions
diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h index 4113796e0ef4..be3b4c25f335 100644 --- a/arch/mips/include/asm/cpu-info.h +++ b/arch/mips/include/asm/cpu-info.h @@ -110,6 +110,7 @@ struct cpuinfo_mips { struct guest_info guest; unsigned int gtoffset_mask; unsigned int guestid_mask; + unsigned int guestid_cache; } __attribute__((aligned(SMP_CACHE_BYTES))); extern struct cpuinfo_mips cpu_data[]; diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index b47571850aac..bc3f9dedaac8 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -10,6 +10,7 @@ #ifndef __MIPS_KVM_HOST_H__ #define __MIPS_KVM_HOST_H__ +#include <linux/cpumask.h> #include <linux/mutex.h> #include <linux/hrtimer.h> #include <linux/interrupt.h> @@ -73,6 +74,11 @@ #define KVM_COALESCED_MMIO_PAGE_OFFSET 1 #define KVM_HALT_POLL_NS_DEFAULT 500000 +#ifdef CONFIG_KVM_MIPS_VZ +extern unsigned long GUESTID_MASK; +extern unsigned long GUESTID_FIRST_VERSION; +extern unsigned long GUESTID_VERSION_MASK; +#endif /* @@ -167,6 +173,8 @@ struct kvm_arch_memory_slot { struct kvm_arch { /* Guest physical mm */ struct mm_struct gpa_mm; + /* Mask of CPUs needing GPA ASID flush */ + cpumask_t asid_flush_mask; }; #define N_MIPS_COPROC_REGS 32 @@ -224,6 +232,11 @@ struct mips_coproc { #define MIPS_CP0_CONFIG4_SEL 4 #define MIPS_CP0_CONFIG5_SEL 5 +#define MIPS_CP0_GUESTCTL2 10 +#define MIPS_CP0_GUESTCTL2_SEL 5 +#define MIPS_CP0_GTOFFSET 12 +#define MIPS_CP0_GTOFFSET_SEL 7 + /* Resume Flags */ #define RESUME_FLAG_DR (1<<0) /* Reload guest nonvolatile state? */ #define RESUME_FLAG_HOST (1<<1) /* Resume host? */ @@ -356,7 +369,20 @@ struct kvm_vcpu_arch { /* Cache some mmu pages needed inside spinlock regions */ struct kvm_mmu_memory_cache mmu_page_cache; +#ifdef CONFIG_KVM_MIPS_VZ + /* vcpu's vzguestid is different on each host cpu in an smp system */ + u32 vzguestid[NR_CPUS]; + + /* wired guest TLB entries */ + struct kvm_mips_tlb *wired_tlb; + unsigned int wired_tlb_limit; + unsigned int wired_tlb_used; +#endif + + /* Last CPU the VCPU state was loaded on */ int last_sched_cpu; + /* Last CPU the VCPU actually executed guest code on */ + int last_exec_cpu; /* WAIT executed */ int wait; @@ -660,6 +686,7 @@ __BUILD_KVM_RW_HW(config4, 32, MIPS_CP0_CONFIG, 4) __BUILD_KVM_RW_HW(config5, 32, MIPS_CP0_CONFIG, 5) __BUILD_KVM_RW_HW(config6, 32, MIPS_CP0_CONFIG, 6) __BUILD_KVM_RW_HW(config7, 32, MIPS_CP0_CONFIG, 7) +__BUILD_KVM_RW_HW(xcontext, l, MIPS_CP0_TLB_XCONTEXT, 0) __BUILD_KVM_RW_HW(errorepc, l, MIPS_CP0_ERROR_PC, 0) __BUILD_KVM_RW_HW(kscratch1, l, MIPS_CP0_DESAVE, 2) __BUILD_KVM_RW_HW(kscratch2, l, MIPS_CP0_DESAVE, 3) @@ -674,6 +701,14 @@ __BUILD_KVM_SET_HW(status, 32, MIPS_CP0_STATUS, 0) __BUILD_KVM_ATOMIC_HW(cause, 32, MIPS_CP0_CAUSE, 0) __BUILD_KVM_SET_HW(ebase, l, MIPS_CP0_PRID, 1) +/* Bitwise operations (on saved state) */ +__BUILD_KVM_SET_SAVED(config, 32, MIPS_CP0_CONFIG, 0) +__BUILD_KVM_SET_SAVED(config1, 32, MIPS_CP0_CONFIG, 1) +__BUILD_KVM_SET_SAVED(config2, 32, MIPS_CP0_CONFIG, 2) +__BUILD_KVM_SET_SAVED(config3, 32, MIPS_CP0_CONFIG, 3) +__BUILD_KVM_SET_SAVED(config4, 32, MIPS_CP0_CONFIG, 4) +__BUILD_KVM_SET_SAVED(config5, 32, MIPS_CP0_CONFIG, 5) + /* Helpers */ static inline bool kvm_mips_guest_can_have_fpu(struct kvm_vcpu_arch *vcpu) @@ -786,6 +821,10 @@ u32 kvm_get_user_asid(struct kvm_vcpu *vcpu); u32 kvm_get_commpage_asid (struct kvm_vcpu *vcpu); +#ifdef CONFIG_KVM_MIPS_VZ +int kvm_mips_handle_vz_root_tlb_fault(unsigned long badvaddr, + struct kvm_vcpu *vcpu, bool write_fault); +#endif extern int kvm_mips_handle_kseg0_tlb_fault(unsigned long badbaddr, struct kvm_vcpu *vcpu, bool write_fault); @@ -1026,6 +1065,9 @@ enum emulation_result kvm_mips_emulate_load(union mips_instruction inst, struct kvm_run *run, struct kvm_vcpu *vcpu); +/* COP0 */ +enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu); + unsigned int kvm_mips_config1_wrmask(struct kvm_vcpu *vcpu); unsigned int kvm_mips_config3_wrmask(struct kvm_vcpu *vcpu); unsigned int kvm_mips_config4_wrmask(struct kvm_vcpu *vcpu); diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c index a7f81261c781..c036157fb891 100644 --- a/arch/mips/kernel/time.c +++ b/arch/mips/kernel/time.c @@ -70,6 +70,7 @@ EXPORT_SYMBOL(perf_irq); */ unsigned int mips_hpt_frequency; +EXPORT_SYMBOL_GPL(mips_hpt_frequency); /* * This function exists in order to cause an error due to a duplicate diff --git a/arch/mips/kvm/interrupt.h b/arch/mips/kvm/interrupt.h index fb118a2c8379..3bf0a49725e8 100644 --- a/arch/mips/kvm/interrupt.h +++ b/arch/mips/kvm/interrupt.h @@ -30,8 +30,13 @@ #define C_TI (_ULCAST_(1) << 30) +#ifdef CONFIG_KVM_MIPS_VZ +#define KVM_MIPS_IRQ_DELIVER_ALL_AT_ONCE (1) +#define KVM_MIPS_IRQ_CLEAR_ALL_AT_ONCE (1) +#else #define KVM_MIPS_IRQ_DELIVER_ALL_AT_ONCE (0) #define KVM_MIPS_IRQ_CLEAR_ALL_AT_ONCE (0) +#endif void kvm_mips_queue_irq(struct kvm_vcpu *vcpu, unsigned int priority); void kvm_mips_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int priority); diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 8c10148a345c..1bb5d01d5dec 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -113,7 +113,11 @@ void kvm_arch_check_processor_compat(void *rtn) int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) { switch (type) { +#ifdef CONFIG_KVM_MIPS_VZ + case KVM_VM_MIPS_VZ: +#else case KVM_VM_MIPS_TE: +#endif break; default: /* Unsupported KVM type */ @@ -378,6 +382,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) /* Init */ vcpu->arch.last_sched_cpu = -1; + vcpu->arch.last_exec_cpu = -1; return vcpu; diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c index cb0faade311e..ee64db032793 100644 --- a/arch/mips/kvm/mmu.c +++ b/arch/mips/kvm/mmu.c @@ -992,6 +992,22 @@ static pte_t kvm_mips_gpa_pte_to_gva_mapped(pte_t pte, long entrylo) return kvm_mips_gpa_pte_to_gva_unmapped(pte); } +#ifdef CONFIG_KVM_MIPS_VZ +int kvm_mips_handle_vz_root_tlb_fault(unsigned long badvaddr, + struct kvm_vcpu *vcpu, + bool write_fault) +{ + int ret; + + ret = kvm_mips_map_page(vcpu, badvaddr, write_fault, NULL, NULL); + if (ret) + return ret; + + /* Invalidate this entry in the TLB */ + return kvm_vz_host_tlb_inv(vcpu, badvaddr); +} +#endif + /* XXXKYMA: Must be called with interrupts disabled */ int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr, struct kvm_vcpu *vcpu, @@ -1225,6 +1241,10 @@ int kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu, u32 *out) { int err; + if (WARN(IS_ENABLED(CONFIG_KVM_MIPS_VZ), + "Expect BadInstr/BadInstrP registers to be used with VZ\n")) + return -EINVAL; + retry: kvm_trap_emul_gva_lockless_begin(vcpu); err = get_user(*out, opc); diff --git a/arch/mips/kvm/tlb.c b/arch/mips/kvm/tlb.c index a28fcb1e5072..c215470fdcb0 100644 --- a/arch/mips/kvm/tlb.c +++ b/arch/mips/kvm/tlb.c @@ -34,6 +34,13 @@ #define KVM_GUEST_SP_TLB 1 #ifdef CONFIG_KVM_MIPS_VZ +unsigned long GUESTID_MASK; +EXPORT_SYMBOL_GPL(GUESTID_MASK); +unsigned long GUESTID_FIRST_VERSION; +EXPORT_SYMBOL_GPL(GUESTID_FIRST_VERSION); +unsigned long GUESTID_VERSION_MASK; +EXPORT_SYMBOL_GPL(GUESTID_VERSION_MASK); + static u32 kvm_mips_get_root_asid(struct kvm_vcpu *vcpu) { struct mm_struct *gpa_mm = &vcpu->kvm->arch.gpa_mm; diff --git a/arch/mips/kvm/trace.h b/arch/mips/kvm/trace.h index 0c59282a2f7d..d80d37a1b82e 100644 --- a/arch/mips/kvm/trace.h +++ b/arch/mips/kvm/trace.h @@ -286,6 +286,21 @@ TRACE_EVENT(kvm_asid_change, __entry->new_asid) ); +TRACE_EVENT(kvm_guestid_change, + TP_PROTO(struct kvm_vcpu *vcpu, unsigned int guestid), + TP_ARGS(vcpu, guestid), + TP_STRUCT__entry( + __field(unsigned int, guestid) + ), + + TP_fast_assign( + __entry->guestid = guestid; + ), + + TP_printk("GuestID: 0x%02x", + __entry->guestid) +); + #endif /* _TRACE_KVM_H */ /* This part must be outside protection */ diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c new file mode 100644 index 000000000000..cfed234be1e3 --- /dev/null +++ b/arch/mips/kvm/vz.c @@ -0,0 +1,2381 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Support for hardware virtualization extensions + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + * Authors: Yann Le Du <ledu@kymasys.com> + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/preempt.h> +#include <linux/vmalloc.h> +#include <asm/cacheflush.h> +#include <asm/cacheops.h> +#include <asm/cmpxchg.h> +#include <asm/fpu.h> +#include <asm/hazards.h> +#include <asm/inst.h> +#include <asm/mmu_context.h> +#include <asm/r4kcache.h> +#include <asm/time.h> +#include <asm/tlb.h> +#include <asm/tlbex.h> + +#include <linux/kvm_host.h> + +#include "interrupt.h" + +#include "trace.h" + +/* Pointers to last VCPU loaded on each physical CPU */ +static struct kvm_vcpu *last_vcpu[NR_CPUS]; +/* Pointers to last VCPU executed on each physical CPU */ +static struct kvm_vcpu *last_exec_vcpu[NR_CPUS]; + +/* + * Number of guest VTLB entries to use, so we can catch inconsistency between + * CPUs. + */ +static unsigned int kvm_vz_guest_vtlb_size; + +static inline long kvm_vz_read_gc0_ebase(void) +{ + if (sizeof(long) == 8 && cpu_has_ebase_wg) + return read_gc0_ebase_64(); + else + return read_gc0_ebase(); +} + +static inline void kvm_vz_write_gc0_ebase(long v) +{ + /* + * First write with WG=1 to write upper bits, then write again in case + * WG should be left at 0. + * write_gc0_ebase_64() is no longer UNDEFINED since R6. + */ + if (sizeof(long) == 8 && + (cpu_has_mips64r6 || cpu_has_ebase_wg)) { + write_gc0_ebase_64(v | MIPS_EBASE_WG); + write_gc0_ebase_64(v); + } else { + write_gc0_ebase(v | MIPS_EBASE_WG); + write_gc0_ebase(v); + } +} + +/* + * These Config bits may be writable by the guest: + * Config: [K23, KU] (!TLB), K0 + * Config1: (none) + * Config2: [TU, SU] (impl) + * Config3: ISAOnExc + * Config4: FTLBPageSize + * Config5: K, CV, MSAEn, UFE, FRE, SBRI, UFR + */ + +static inline unsigned int kvm_vz_config_guest_wrmask(struct kvm_vcpu *vcpu) +{ + return CONF_CM_CMASK; +} + +static inline unsigned int kvm_vz_config1_guest_wrmask(struct kvm_vcpu *vcpu) +{ + return 0; +} + +static inline unsigned int kvm_vz_config2_guest_wrmask(struct kvm_vcpu *vcpu) +{ + return 0; +} + +static inline unsigned int kvm_vz_config3_guest_wrmask(struct kvm_vcpu *vcpu) +{ + return MIPS_CONF3_ISA_OE; +} + +static inline unsigned int kvm_vz_config4_guest_wrmask(struct kvm_vcpu *vcpu) +{ + /* no need to be exact */ + return MIPS_CONF4_VFTLBPAGESIZE; +} + +static inline unsigned int kvm_vz_config5_guest_wrmask(struct kvm_vcpu *vcpu) +{ + unsigned int mask = MIPS_CONF5_K | MIPS_CONF5_CV | MIPS_CONF5_SBRI; + + /* Permit MSAEn changes if MSA supported and enabled */ + if (kvm_mips_guest_has_msa(&vcpu->arch)) + mask |= MIPS_CONF5_MSAEN; + + /* + * Permit guest FPU mode changes if FPU is enabled and the relevant + * feature exists according to FIR register. + */ + if (kvm_mips_guest_has_fpu(&vcpu->arch)) { + if (cpu_has_ufr) + mask |= MIPS_CONF5_UFR; + if (cpu_has_fre) + mask |= MIPS_CONF5_FRE | MIPS_CONF5_UFE; + } + + return mask; +} + +/* + * VZ optionally allows these additional Config bits to be written by root: + * Config: M, [MT] + * Config1: M, [MMUSize-1, C2, MD, PC, WR, CA], FP + * Config2: M + * Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP, CTXTC, ITL, LPA, VEIC, + * VInt, SP, CDMM, MT, SM, TL] + * Config4: M, [VTLBSizeExt, MMUSizeExt] + * Config5: [MRP] + */ + +static inline unsigned int kvm_vz_config_user_wrmask(struct kvm_vcpu *vcpu) +{ + return kvm_vz_config_guest_wrmask(vcpu) | MIPS_CONF_M; +} + +static inline unsigned int kvm_vz_config1_user_wrmask(struct kvm_vcpu *vcpu) +{ + unsigned int mask = kvm_vz_config1_guest_wrmask(vcpu) | MIPS_CONF_M; + + /* Permit FPU to be present if FPU is supported */ + if (kvm_mips_guest_can_have_fpu(&vcpu->arch)) + mask |= MIPS_CONF1_FP; + + return mask; +} + +static inline unsigned int kvm_vz_config2_user_wrmask(struct kvm_vcpu *vcpu) +{ + return kvm_vz_config2_guest_wrmask(vcpu) | MIPS_CONF_M; +} + +static inline unsigned int kvm_vz_config3_user_wrmask(struct kvm_vcpu *vcpu) +{ + unsigned int mask = kvm_vz_config3_guest_wrmask(vcpu) | MIPS_CONF_M | + MIPS_CONF3_ULRI; + + /* Permit MSA to be present if MSA is supported */ + if (kvm_mips_guest_can_have_msa(&vcpu->arch)) + mask |= MIPS_CONF3_MSA; + + return mask; +} + +static inline unsigned int kvm_vz_config4_user_wrmask(struct kvm_vcpu *vcpu) +{ + return kvm_vz_config4_guest_wrmask(vcpu) | MIPS_CONF_M; +} + +static inline unsigned int kvm_vz_config5_user_wrmask(struct kvm_vcpu *vcpu) +{ + return kvm_vz_config5_guest_wrmask(vcpu); +} + +static gpa_t kvm_vz_gva_to_gpa_cb(gva_t gva) +{ + /* VZ guest has already converted gva to gpa */ + return gva; +} + +static void kvm_vz_queue_irq(struct kvm_vcpu *vcpu, unsigned int priority) +{ + set_bit(priority, &vcpu->arch.pending_exceptions); + clear_bit(priority, &vcpu->arch.pending_exceptions_clr); +} + +static void kvm_vz_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int priority) +{ + clear_bit(priority, &vcpu->arch.pending_exceptions); + set_bit(priority, &vcpu->arch.pending_exceptions_clr); +} + +static void kvm_vz_queue_timer_int_cb(struct kvm_vcpu *vcpu) +{ + /* + * timer expiry is asynchronous to vcpu execution therefore defer guest + * cp0 accesses + */ + kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER); +} + +static void kvm_vz_dequeue_timer_int_cb(struct kvm_vcpu *vcpu) +{ + /* + * timer expiry is asynchronous to vcpu execution therefore defer guest + * cp0 accesses + */ + kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_TIMER); +} + +static void kvm_vz_queue_io_int_cb(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq) +{ + int intr = (int)irq->irq; + + /* + * interrupts are asynchronous to vcpu execution therefore defer guest + * cp0 accesses + */ + switch (intr) { + case 2: + kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IO); + break; + + case 3: + kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IPI_1); + break; + + case 4: + kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IPI_2); + break; + + default: + break; + } + +} + +static void kvm_vz_dequeue_io_int_cb(struct kvm_vcpu *vcpu, + struct kvm_mips_interrupt *irq) +{ + int intr = (int)irq->irq; + + /* + * interrupts are asynchronous to vcpu execution therefore defer guest + * cp0 accesses + */ + switch (intr) { + case -2: + kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IO); + break; + + case -3: + kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_1); + break; + + case -4: + kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_2); + break; + + default: + break; + } + +} + +static u32 kvm_vz_priority_to_irq[MIPS_EXC_MAX] = { + [MIPS_EXC_INT_TIMER] = C_IRQ5, + [MIPS_EXC_INT_IO] = C_IRQ0, + [MIPS_EXC_INT_IPI_1] = C_IRQ1, + [MIPS_EXC_INT_IPI_2] = C_IRQ2, +}; + +static int kvm_vz_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority, + u32 cause) +{ + u32 irq = (priority < MIPS_EXC_MAX) ? + kvm_vz_priority_to_irq[priority] : 0; + + switch (priority) { + case MIPS_EXC_INT_TIMER: + set_gc0_cause(C_TI); + break; + + case MIPS_EXC_INT_IO: + case MIPS_EXC_INT_IPI_1: + case MIPS_EXC_INT_IPI_2: + if (cpu_has_guestctl2) + set_c0_guestctl2(irq); + else + set_gc0_cause(irq); + break; + + default: + break; + } + + clear_bit(priority, &vcpu->arch.pending_exceptions); + return 1; +} + +static int kvm_vz_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority, + u32 cause) +{ + u32 irq = (priority < MIPS_EXC_MAX) ? + kvm_vz_priority_to_irq[priority] : 0; + + switch (priority) { + case MIPS_EXC_INT_TIMER: + /* + * Call to kvm_write_c0_guest_compare() clears Cause.TI in + * kvm_mips_emulate_CP0(). Explicitly clear irq associated with + * Cause.IP[IPTI] if GuestCtl2 virtual interrupt register not + * supported or if not using GuestCtl2 Hardware Clear. + */ + if (cpu_has_guestctl2) { + if (!(read_c0_guestctl2() & (irq << 14))) + clear_c0_guestctl2(irq); + } else { + clear_gc0_cause(irq); + } + break; + + case MIPS_EXC_INT_IO: + case MIPS_EXC_INT_IPI_1: + case MIPS_EXC_INT_IPI_2: + /* Clear GuestCtl2.VIP irq if not using Hardware Clear */ + if (cpu_has_guestctl2) { + if (!(read_c0_guestctl2() & (irq << 14))) + clear_c0_guestctl2(irq); + } else { + clear_gc0_cause(irq); + } + break; + + default: + break; + } + + clear_bit(priority, &vcpu->arch.pending_exceptions_clr); + return 1; +} + +/* + * VZ guest timer handling. + */ + +/** + * _kvm_vz_restore_stimer() - Restore soft timer state. + * @vcpu: Virtual CPU. + * @compare: CP0_Compare register value, restored by caller. + * @cause: CP0_Cause register to restore. + * + * Restore VZ state relating to the soft timer. + */ +static void _kvm_vz_restore_stimer(struct kvm_vcpu *vcpu, u32 compare, + u32 cause) +{ + /* + * Avoid spurious counter interrupts by setting Guest CP0_Count to just + * after Guest CP0_Compare. + */ + write_c0_gtoffset(compare - read_c0_count()); + + back_to_back_c0_hazard(); + write_gc0_cause(cause); +} + +/** + * kvm_vz_restore_timer() - Restore guest timer state. + * @vcpu: Virtual CPU. + * + * Restore soft timer state from saved context. + */ +static void kvm_vz_restore_timer(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + u32 cause, compare; + + compare = kvm_read_sw_gc0_compare(cop0); + cause = kvm_read_sw_gc0_cause(cop0); + + write_gc0_compare(compare); + _kvm_vz_restore_stimer(vcpu, compare, cause); +} + +/** + * kvm_vz_save_timer() - Save guest timer state. + * @vcpu: Virtual CPU. + * + * Save VZ guest timer state. + */ +static void kvm_vz_save_timer(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + u32 compare, cause; + + compare = read_gc0_compare(); + cause = read_gc0_cause(); + + /* save timer-related state to VCPU context */ + kvm_write_sw_gc0_cause(cop0, cause); + kvm_write_sw_gc0_compare(cop0, compare); +} + +/** + * kvm_vz_gva_to_gpa() - Convert valid GVA to GPA. + * @vcpu: KVM VCPU state. + * @gva: Guest virtual address to convert. + * @gpa: Output guest physical address. + * + * Convert a guest virtual address (GVA) which is valid according to the guest + * context, to a guest physical address (GPA). + * + * Returns: 0 on success. + * -errno on failure. + */ +static int kvm_vz_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, + unsigned long *gpa) +{ + u32 gva32 = gva; + + if ((long)gva == (s32)gva32) { + /* Handle canonical 32-bit virtual address */ + if ((s32)gva32 < (s32)0xc0000000) { + /* legacy unmapped KSeg0 or KSeg1 */ + *gpa = gva32 & 0x1fffffff; + return 0; + } +#ifdef CONFIG_64BIT + } else if ((gva & 0xc000000000000000) == 0x8000000000000000) { + /* XKPHYS */ + /* + * Traditionally fully unmapped. + * Bits 61:59 specify the CCA, which we can just mask off here. + * Bits 58:PABITS should be zero, but we shouldn't have got here + * if it wasn't. + */ + *gpa = gva & 0x07ffffffffffffff; + return 0; +#endif + } + + return kvm_vz_guest_tlb_lookup(vcpu, gva, gpa); +} + +/** + * kvm_vz_badvaddr_to_gpa() - Convert GVA BadVAddr from root exception to GPA. + * @vcpu: KVM VCPU state. + * @badvaddr: Root BadVAddr. + * @gpa: Output guest physical address. + * + * VZ implementations are permitted to report guest virtual addresses (GVA) in + * BadVAddr on a root exception during guest execution, instead of the more + * convenient guest physical addresses (GPA). When we get a GVA, this function + * converts it to a GPA, taking into account guest segmentation and guest TLB + * state. + * + * Returns: 0 on success. + * -errno on failure. + */ +static int kvm_vz_badvaddr_to_gpa(struct kvm_vcpu *vcpu, unsigned long badvaddr, + unsigned long *gpa) +{ + unsigned int gexccode = (vcpu->arch.host_cp0_guestctl0 & + MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT; + + /* If BadVAddr is GPA, then all is well in the world */ + if (likely(gexccode == MIPS_GCTL0_GEXC_GPA)) { + *gpa = badvaddr; + return 0; + } + + /* Otherwise we'd expect it to be GVA ... */ + if (WARN(gexccode != MIPS_GCTL0_GEXC_GVA, + "Unexpected gexccode %#x\n", gexccode)) + return -EINVAL; + + /* ... and we need to perform the GVA->GPA translation in software */ + return kvm_vz_gva_to_gpa(vcpu, badvaddr, gpa); +} + +static int kvm_trap_vz_no_handler(struct kvm_vcpu *vcpu) +{ + u32 *opc = (u32 *) vcpu->arch.pc; + u32 cause = vcpu->arch.host_cp0_cause; + u32 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE; + unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; + u32 inst = 0; + + /* + * Fetch the instruction. + */ + if (cause & CAUSEF_BD) + opc += 1; + kvm_get_badinstr(opc, vcpu, &inst); + + kvm_err("Exception Code: %d not handled @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n", + exccode, opc, inst, badvaddr, + read_gc0_status()); + kvm_arch_vcpu_dump_regs(vcpu); + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return RESUME_HOST; +} + +static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst, + u32 *opc, u32 cause, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + enum emulation_result er = EMULATE_DONE; + u32 rt, rd, sel; + unsigned long curr_pc; + unsigned long val; + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, cause); + if (er == EMULATE_FAIL) + return er; + + if (inst.co_format.co) { + switch (inst.co_format.func) { + case wait_op: + er = kvm_mips_emul_wait(vcpu); + break; + default: + er = EMULATE_FAIL; + } + } else { + rt = inst.c0r_format.rt; + rd = inst.c0r_format.rd; + sel = inst.c0r_format.sel; + + switch (inst.c0r_format.rs) { + case dmfc_op: + case mfc_op: +#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS + cop0->stat[rd][sel]++; +#endif + if (rd == MIPS_CP0_COUNT && + sel == 0) { /* Count */ + val = kvm_mips_read_count(vcpu); + } else if (rd == MIPS_CP0_COMPARE && + sel == 0) { /* Compare */ + val = read_gc0_compare(); + } else if ((rd == MIPS_CP0_PRID && + (sel == 0 || /* PRid */ + sel == 2 || /* CDMMBase */ + sel == 3)) || /* CMGCRBase */ + (rd == MIPS_CP0_STATUS && + (sel == 2 || /* SRSCtl */ + sel == 3)) || /* SRSMap */ + (rd == MIPS_CP0_CONFIG && + (sel == 7)) || /* Config7 */ + (rd == MIPS_CP0_ERRCTL && + (sel == 0))) { /* ErrCtl */ + val = cop0->reg[rd][sel]; + } else { + val = 0; + er = EMULATE_FAIL; + } + + if (er != EMULATE_FAIL) { + /* Sign extend */ + if (inst.c0r_format.rs == mfc_op) + val = (int)val; + vcpu->arch.gprs[rt] = val; + } + + trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mfc_op) ? + KVM_TRACE_MFC0 : KVM_TRACE_DMFC0, + KVM_TRACE_COP0(rd, sel), val); + break; + + case dmtc_op: + case mtc_op: +#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS + cop0->stat[rd][sel]++; +#endif + val = vcpu->arch.gprs[rt]; + trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mtc_op) ? + KVM_TRACE_MTC0 : KVM_TRACE_DMTC0, + KVM_TRACE_COP0(rd, sel), val); + + if (rd == MIPS_CP0_COUNT && + sel == 0) { /* Count */ + kvm_mips_write_count(vcpu, vcpu->arch.gprs[rt]); + } else if (rd == MIPS_CP0_COMPARE && + sel == 0) { /* Compare */ + kvm_mips_write_compare(vcpu, + vcpu->arch.gprs[rt], + true); + } else if (rd == MIPS_CP0_ERRCTL && + (sel == 0)) { /* ErrCtl */ + /* ignore the written value */ + } else { + er = EMULATE_FAIL; + } + break; + + default: + er = EMULATE_FAIL; + break; + } + } + /* Rollback PC only if emulation was unsuccessful */ + if (er == EMULATE_FAIL) { + kvm_err("[%#lx]%s: unsupported cop0 instruction 0x%08x\n", + curr_pc, __func__, inst.word); + + vcpu->arch.pc = curr_pc; + } + + return er; +} + +static enum emulation_result kvm_vz_gpsi_cache(union mips_instruction inst, + u32 *opc, u32 cause, + struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; + u32 cache, op_inst, op, base; + s16 offset; + struct kvm_vcpu_arch *arch = &vcpu->arch; + unsigned long va, curr_pc; + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, cause); + if (er == EMULATE_FAIL) + return er; + + base = inst.i_format.rs; + op_inst = inst.i_format.rt; + if (cpu_has_mips_r6) + offset = inst.spec3_format.simmediate; + else + offset = inst.i_format.simmediate; + cache = op_inst & CacheOp_Cache; + op = op_inst & CacheOp_Op; + + va = arch->gprs[base] + offset; + + kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + cache, op, base, arch->gprs[base], offset); + + /* Secondary or tirtiary cache ops ignored */ + if (cache != Cache_I && cache != Cache_D) + return EMULATE_DONE; + + switch (op_inst) { + case Index_Invalidate_I: + flush_icache_line_indexed(va); + return EMULATE_DONE; + case Index_Writeback_Inv_D: + flush_dcache_line_indexed(va); + return EMULATE_DONE; + default: + break; + }; + + kvm_err("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", + curr_pc, vcpu->arch.gprs[31], cache, op, base, arch->gprs[base], + offset); + /* Rollback PC */ + vcpu->arch.pc = curr_pc; + + return EMULATE_FAIL; +} + +static enum emulation_result kvm_trap_vz_handle_gpsi(u32 cause, u32 *opc, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; + struct kvm_vcpu_arch *arch = &vcpu->arch; + struct kvm_run *run = vcpu->run; + union mips_instruction inst; + int rd, rt, sel; + int err; + + /* + * Fetch the instruction. + */ + if (cause & CAUSEF_BD) + opc += 1; + err = kvm_get_badinstr(opc, vcpu, &inst.word); + if (err) + return EMULATE_FAIL; + + switch (inst.r_format.opcode) { + case cop0_op: + er = kvm_vz_gpsi_cop0(inst, opc, cause, run, vcpu); + break; +#ifndef CONFIG_CPU_MIPSR6 + case cache_op: + trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE); + er = kvm_vz_gpsi_cache(inst, opc, cause, run, vcpu); + break; +#endif + case spec3_op: + switch (inst.spec3_format.func) { +#ifdef CONFIG_CPU_MIPSR6 + case cache6_op: + trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE); + er = kvm_vz_gpsi_cache(inst, opc, cause, run, vcpu); + break; +#endif + case rdhwr_op: + if (inst.r_format.rs || (inst.r_format.re >> 3)) + goto unknown; + + rd = inst.r_format.rd; + rt = inst.r_format.rt; + sel = inst.r_format.re & 0x7; + + switch (rd) { + case MIPS_HWR_CC: /* Read count register */ + arch->gprs[rt] = + (long)(int)kvm_mips_read_count(vcpu); + break; + default: + trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR, + KVM_TRACE_HWR(rd, sel), 0); + goto unknown; + }; + + trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR, + KVM_TRACE_HWR(rd, sel), arch->gprs[rt]); + + er = update_pc(vcpu, cause); + break; + default: + goto unknown; + }; + break; +unknown: + + default: + kvm_err("GPSI exception not supported (%p/%#x)\n", + opc, inst.word); + kvm_arch_vcpu_dump_regs(vcpu); + er = EMULATE_FAIL; + break; + } + + return er; +} + +static enum emulation_result kvm_trap_vz_handle_gsfc(u32 cause, u32 *opc, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; + struct kvm_vcpu_arch *arch = &vcpu->arch; + union mips_instruction inst; + int err; + + /* + * Fetch the instruction. + */ + if (cause & CAUSEF_BD) + opc += 1; + err = kvm_get_badinstr(opc, vcpu, &inst.word); + if (err) + return EMULATE_FAIL; + + /* complete MTC0 on behalf of guest and advance EPC */ + if (inst.c0r_format.opcode == cop0_op && + inst.c0r_format.rs == mtc_op && + inst.c0r_format.z == 0) { + int rt = inst.c0r_format.rt; + int rd = inst.c0r_format.rd; + int sel = inst.c0r_format.sel; + unsigned int val = arch->gprs[rt]; + unsigned int old_val, change; + + trace_kvm_hwr(vcpu, KVM_TRACE_MTC0, KVM_TRACE_COP0(rd, sel), + val); + + if ((rd == MIPS_CP0_STATUS) && (sel == 0)) { + /* FR bit should read as zero if no FPU */ + if (!kvm_mips_guest_has_fpu(&vcpu->arch)) + val &= ~(ST0_CU1 | ST0_FR); + + /* + * Also don't allow FR to be set if host doesn't support + * it. + */ + if (!(boot_cpu_data.fpu_id & MIPS_FPIR_F64)) + val &= ~ST0_FR; + + old_val = read_gc0_status(); + change = val ^ old_val; + + if (change & ST0_FR) { + /* + * FPU and Vector register state is made + * UNPREDICTABLE by a change of FR, so don't + * even bother saving it. + */ + kvm_drop_fpu(vcpu); + } + + /* + * If MSA state is already live, it is undefined how it + * interacts with FR=0 FPU state, and we don't want to + * hit reserved instruction exceptions trying to save + * the MSA state later when CU=1 && FR=1, so play it + * safe and save it first. + */ + if (change & ST0_CU1 && !(val & ST0_FR) && + vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) + kvm_lose_fpu(vcpu); + + write_gc0_status(val); + } else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) { + u32 old_cause = read_gc0_cause(); + u32 change = old_cause ^ val; + + /* DC bit enabling/disabling timer? */ + if (change & CAUSEF_DC) { + if (val & CAUSEF_DC) + kvm_mips_count_disable_cause(vcpu); + else + kvm_mips_count_enable_cause(vcpu); + } + + /* Only certain bits are RW to the guest */ + change &= (CAUSEF_DC | CAUSEF_IV | CAUSEF_WP | + CAUSEF_IP0 | CAUSEF_IP1); + + /* WP can only be cleared */ + change &= ~CAUSEF_WP | old_cause; + + write_gc0_cause(old_cause ^ change); + } else if ((rd == MIPS_CP0_STATUS) && (sel == 1)) { /* IntCtl */ + write_gc0_intctl(val); + } else if ((rd == MIPS_CP0_CONFIG) && (sel == 5)) { + old_val = read_gc0_config5(); + change = val ^ old_val; + /* Handle changes in FPU/MSA modes */ + preempt_disable(); + + /* + * Propagate FRE changes immediately if the FPU + * context is already loaded. + */ + if (change & MIPS_CONF5_FRE && + vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) + change_c0_config5(MIPS_CONF5_FRE, val); + + preempt_enable(); + + val = old_val ^ + (change & kvm_vz_config5_guest_wrmask(vcpu)); + write_gc0_config5(val); + } else { + kvm_err("Handle GSFC, unsupported field change @ %p: %#x\n", + opc, inst.word); + er = EMULATE_FAIL; + } + + if (er != EMULATE_FAIL) + er = update_pc(vcpu, cause); + } else { + kvm_err("Handle GSFC, unrecognized instruction @ %p: %#x\n", + opc, inst.word); + er = EMULATE_FAIL; + } + + return er; +} + +static enum emulation_result kvm_trap_vz_handle_hc(u32 cause, u32 *opc, + struct kvm_vcpu *vcpu) +{ + enum emulation_result er; + union mips_instruction inst; + unsigned long curr_pc; + int err; + + if (cause & CAUSEF_BD) + opc += 1; + err = kvm_get_badinstr(opc, vcpu, &inst.word); + if (err) + return EMULATE_FAIL; + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + er = update_pc(vcpu, cause); + if (er == EMULATE_FAIL) + return er; + + er = kvm_mips_emul_hypcall(vcpu, inst); + if (er == EMULATE_FAIL) + vcpu->arch.pc = curr_pc; + + return er; +} + +static enum emulation_result kvm_trap_vz_no_handler_guest_exit(u32 gexccode, + u32 cause, + u32 *opc, + struct kvm_vcpu *vcpu) +{ + u32 inst; + + /* + * Fetch the instruction. + */ + if (cause & CAUSEF_BD) + opc += 1; + kvm_get_badinstr(opc, vcpu, &inst); + + kvm_err("Guest Exception Code: %d not yet handled @ PC: %p, inst: 0x%08x Status: %#x\n", + gexccode, opc, inst, read_gc0_status()); + + return EMULATE_FAIL; +} + +static int kvm_trap_vz_handle_guest_exit(struct kvm_vcpu *vcpu) +{ + u32 *opc = (u32 *) vcpu->arch.pc; + u32 cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_DONE; + u32 gexccode = (vcpu->arch.host_cp0_guestctl0 & + MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT; + int ret = RESUME_GUEST; + + trace_kvm_exit(vcpu, KVM_TRACE_EXIT_GEXCCODE_BASE + gexccode); + switch (gexccode) { + case MIPS_GCTL0_GEXC_GPSI: + ++vcpu->stat.vz_gpsi_exits; + er = kvm_trap_vz_handle_gpsi(cause, opc, vcpu); + break; + case MIPS_GCTL0_GEXC_GSFC: + ++vcpu->stat.vz_gsfc_exits; + er = kvm_trap_vz_handle_gsfc(cause, opc, vcpu); + break; + case MIPS_GCTL0_GEXC_HC: + ++vcpu->stat.vz_hc_exits; + er = kvm_trap_vz_handle_hc(cause, opc, vcpu); + break; + case MIPS_GCTL0_GEXC_GRR: + ++vcpu->stat.vz_grr_exits; + er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc, + vcpu); + break; + case MIPS_GCTL0_GEXC_GVA: + ++vcpu->stat.vz_gva_exits; + er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc, + vcpu); + break; + case MIPS_GCTL0_GEXC_GHFC: + ++vcpu->stat.vz_ghfc_exits; + er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc, + vcpu); + break; + case MIPS_GCTL0_GEXC_GPA: + ++vcpu->stat.vz_gpa_exits; + er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc, + vcpu); + break; + default: + ++vcpu->stat.vz_resvd_exits; + er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc, + vcpu); + break; + + } + + if (er == EMULATE_DONE) { + ret = RESUME_GUEST; + } else if (er == EMULATE_HYPERCALL) { + ret = kvm_mips_handle_hypcall(vcpu); + } else { + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +/** + * kvm_trap_vz_handle_cop_unusuable() - Guest used unusable coprocessor. + * @vcpu: Virtual CPU context. + * + * Handle when the guest attempts to use a coprocessor which hasn't been allowed + * by the root context. + */ +static int kvm_trap_vz_handle_cop_unusable(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + u32 cause = vcpu->arch.host_cp0_cause; + enum emulation_result er = EMULATE_FAIL; + int ret = RESUME_GUEST; + + if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) { + /* + * If guest FPU not present, the FPU operation should have been + * treated as a reserved instruction! + * If FPU already in use, we shouldn't get this at all. + */ + if (WARN_ON(!kvm_mips_guest_has_fpu(&vcpu->arch) || + vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)) { + preempt_enable(); + return EMULATE_FAIL; + } + + kvm_own_fpu(vcpu); + er = EMULATE_DONE; + } + /* other coprocessors not handled */ + + switch (er) { + case EMULATE_DONE: + ret = RESUME_GUEST; + break; + + case EMULATE_FAIL: + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + break; + + default: + BUG(); + } + return ret; +} + +/** + * kvm_trap_vz_handle_msa_disabled() - Guest used MSA while disabled in root. + * @vcpu: Virtual CPU context. + * + * Handle when the guest attempts to use MSA when it is disabled in the root + * context. + */ +static int kvm_trap_vz_handle_msa_disabled(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + + /* + * If MSA not present or not exposed to guest or FR=0, the MSA operation + * should have been treated as a reserved instruction! + * Same if CU1=1, FR=0. + * If MSA already in use, we shouldn't get this at all. + */ + if (!kvm_mips_guest_has_msa(&vcpu->arch) || + (read_gc0_status() & (ST0_CU1 | ST0_FR)) == ST0_CU1 || + !(read_gc0_config5() & MIPS_CONF5_MSAEN) || + vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return RESUME_HOST; + } + + kvm_own_msa(vcpu); + + return RESUME_GUEST; +} + +static int kvm_trap_vz_handle_tlb_ld_miss(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + u32 *opc = (u32 *) vcpu->arch.pc; + u32 cause = vcpu->arch.host_cp0_cause; + ulong badvaddr = vcpu->arch.host_cp0_badvaddr; + union mips_instruction inst; + enum emulation_result er = EMULATE_DONE; + int err, ret = RESUME_GUEST; + + if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, false)) { + /* A code fetch fault doesn't count as an MMIO */ + if (kvm_is_ifetch_fault(&vcpu->arch)) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return RESUME_HOST; + } + + /* Fetch the instruction */ + if (cause & CAUSEF_BD) + opc += 1; + err = kvm_get_badinstr(opc, vcpu, &inst.word); + if (err) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return RESUME_HOST; + } + + /* Treat as MMIO */ + er = kvm_mips_emulate_load(inst, cause, run, vcpu); + if (er == EMULATE_FAIL) { + kvm_err("Guest Emulate Load from MMIO space failed: PC: %p, BadVaddr: %#lx\n", + opc, badvaddr); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + } + } + + if (er == EMULATE_DONE) { + ret = RESUME_GUEST; + } else if (er == EMULATE_DO_MMIO) { + run->exit_reason = KVM_EXIT_MMIO; + ret = RESUME_HOST; + } else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static int kvm_trap_vz_handle_tlb_st_miss(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + u32 *opc = (u32 *) vcpu->arch.pc; + u32 cause = vcpu->arch.host_cp0_cause; + ulong badvaddr = vcpu->arch.host_cp0_badvaddr; + union mips_instruction inst; + enum emulation_result er = EMULATE_DONE; + int err; + int ret = RESUME_GUEST; + + /* Just try the access again if we couldn't do the translation */ + if (kvm_vz_badvaddr_to_gpa(vcpu, badvaddr, &badvaddr)) + return RESUME_GUEST; + vcpu->arch.host_cp0_badvaddr = badvaddr; + + if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, true)) { + /* Fetch the instruction */ + if (cause & CAUSEF_BD) + opc += 1; + err = kvm_get_badinstr(opc, vcpu, &inst.word); + if (err) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return RESUME_HOST; + } + + /* Treat as MMIO */ + er = kvm_mips_emulate_store(inst, cause, run, vcpu); + if (er == EMULATE_FAIL) { + kvm_err("Guest Emulate Store to MMIO space failed: PC: %p, BadVaddr: %#lx\n", + opc, badvaddr); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + } + } + + if (er == EMULATE_DONE) { + ret = RESUME_GUEST; + } else if (er == EMULATE_DO_MMIO) { + run->exit_reason = KVM_EXIT_MMIO; + ret = RESUME_HOST; + } else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +} + +static u64 kvm_vz_get_one_regs[] = { + KVM_REG_MIPS_CP0_INDEX, + KVM_REG_MIPS_CP0_ENTRYLO0, + KVM_REG_MIPS_CP0_ENTRYLO1, + KVM_REG_MIPS_CP0_CONTEXT, + KVM_REG_MIPS_CP0_PAGEMASK, + KVM_REG_MIPS_CP0_PAGEGRAIN, + KVM_REG_MIPS_CP0_WIRED, + KVM_REG_MIPS_CP0_HWRENA, + KVM_REG_MIPS_CP0_BADVADDR, + KVM_REG_MIPS_CP0_COUNT, + KVM_REG_MIPS_CP0_ENTRYHI, + KVM_REG_MIPS_CP0_COMPARE, + KVM_REG_MIPS_CP0_STATUS, + KVM_REG_MIPS_CP0_INTCTL, + KVM_REG_MIPS_CP0_CAUSE, + KVM_REG_MIPS_CP0_EPC, + KVM_REG_MIPS_CP0_PRID, + KVM_REG_MIPS_CP0_EBASE, + KVM_REG_MIPS_CP0_CONFIG, + KVM_REG_MIPS_CP0_CONFIG1, + KVM_REG_MIPS_CP0_CONFIG2, + KVM_REG_MIPS_CP0_CONFIG3, + KVM_REG_MIPS_CP0_CONFIG4, + KVM_REG_MIPS_CP0_CONFIG5, +#ifdef CONFIG_64BIT + KVM_REG_MIPS_CP0_XCONTEXT, +#endif + KVM_REG_MIPS_CP0_ERROREPC, + + KVM_REG_MIPS_COUNT_CTL, + KVM_REG_MIPS_COUNT_RESUME, + KVM_REG_MIPS_COUNT_HZ, +}; + +static u64 kvm_vz_get_one_regs_kscratch[] = { + KVM_REG_MIPS_CP0_KSCRATCH1, + KVM_REG_MIPS_CP0_KSCRATCH2, + KVM_REG_MIPS_CP0_KSCRATCH3, + KVM_REG_MIPS_CP0_KSCRATCH4, + KVM_REG_MIPS_CP0_KSCRATCH5, + KVM_REG_MIPS_CP0_KSCRATCH6, +}; + +static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu) +{ + unsigned long ret; + + ret = ARRAY_SIZE(kvm_vz_get_one_regs); + if (cpu_guest_has_userlocal) + ++ret; + ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask); + + return ret; +} + +static int kvm_vz_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices) +{ + u64 index; + unsigned int i; + + if (copy_to_user(indices, kvm_vz_get_one_regs, + sizeof(kvm_vz_get_one_regs))) + return -EFAULT; + indices += ARRAY_SIZE(kvm_vz_get_one_regs); + + if (cpu_guest_has_userlocal) { + index = KVM_REG_MIPS_CP0_USERLOCAL; + if (copy_to_user(indices, &index, sizeof(index))) + return -EFAULT; + ++indices; + } + for (i = 0; i < 6; ++i) { + if (!cpu_guest_has_kscr(i + 2)) + continue; + + if (copy_to_user(indices, &kvm_vz_get_one_regs_kscratch[i], + sizeof(kvm_vz_get_one_regs_kscratch[i]))) + return -EFAULT; + ++indices; + } + + return 0; +} + +static inline s64 entrylo_kvm_to_user(unsigned long v) +{ + s64 mask, ret = v; + + if (BITS_PER_LONG == 32) { + /* + * KVM API exposes 64-bit version of the register, so move the + * RI/XI bits up into place. + */ + mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI; + ret &= ~mask; + ret |= ((s64)v & mask) << 32; + } + return ret; +} + +static inline unsigned long entrylo_user_to_kvm(s64 v) +{ + unsigned long mask, ret = v; + + if (BITS_PER_LONG == 32) { + /* + * KVM API exposes 64-bit versiono of the register, so move the + * RI/XI bits down into place. + */ + mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI; + ret &= ~mask; + ret |= (v >> 32) & mask; + } + return ret; +} + +static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu, + const struct kvm_one_reg *reg, + s64 *v) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + unsigned int idx; + + switch (reg->id) { + case KVM_REG_MIPS_CP0_INDEX: + *v = (long)read_gc0_index(); + break; + case KVM_REG_MIPS_CP0_ENTRYLO0: + *v = entrylo_kvm_to_user(read_gc0_entrylo0()); + break; + case KVM_REG_MIPS_CP0_ENTRYLO1: + *v = entrylo_kvm_to_user(read_gc0_entrylo1()); + break; + case KVM_REG_MIPS_CP0_CONTEXT: + *v = (long)read_gc0_context(); + break; + case KVM_REG_MIPS_CP0_USERLOCAL: + if (!cpu_guest_has_userlocal) + return -EINVAL; + *v = read_gc0_userlocal(); + break; + case KVM_REG_MIPS_CP0_PAGEMASK: + *v = (long)read_gc0_pagemask(); + break; + case KVM_REG_MIPS_CP0_PAGEGRAIN: + *v = (long)read_gc0_pagegrain(); + break; + case KVM_REG_MIPS_CP0_WIRED: + *v = (long)read_gc0_wired(); + break; + case KVM_REG_MIPS_CP0_HWRENA: + *v = (long)read_gc0_hwrena(); + break; + case KVM_REG_MIPS_CP0_BADVADDR: + *v = (long)read_gc0_badvaddr(); + break; + case KVM_REG_MIPS_CP0_COUNT: + *v = kvm_mips_read_count(vcpu); + break; + case KVM_REG_MIPS_CP0_ENTRYHI: + *v = (long)read_gc0_entryhi(); + break; + case KVM_REG_MIPS_CP0_COMPARE: + *v = (long)read_gc0_compare(); + break; + case KVM_REG_MIPS_CP0_STATUS: + *v = (long)read_gc0_status(); + break; + case KVM_REG_MIPS_CP0_INTCTL: + *v = read_gc0_intctl(); + break; + case KVM_REG_MIPS_CP0_CAUSE: + *v = (long)read_gc0_cause(); + break; + case KVM_REG_MIPS_CP0_EPC: + *v = (long)read_gc0_epc(); + break; + case KVM_REG_MIPS_CP0_PRID: + *v = (long)kvm_read_c0_guest_prid(cop0); + break; + case KVM_REG_MIPS_CP0_EBASE: + *v = kvm_vz_read_gc0_ebase(); + break; + case KVM_REG_MIPS_CP0_CONFIG: + *v = read_gc0_config(); + break; + case KVM_REG_MIPS_CP0_CONFIG1: + if (!cpu_guest_has_conf1) + return -EINVAL; + *v = read_gc0_config1(); + break; + case KVM_REG_MIPS_CP0_CONFIG2: + if (!cpu_guest_has_conf2) + return -EINVAL; + *v = read_gc0_config2(); + break; + case KVM_REG_MIPS_CP0_CONFIG3: + if (!cpu_guest_has_conf3) + return -EINVAL; + *v = read_gc0_config3(); + break; + case KVM_REG_MIPS_CP0_CONFIG4: + if (!cpu_guest_has_conf4) + return -EINVAL; + *v = read_gc0_config4(); + break; + case KVM_REG_MIPS_CP0_CONFIG5: + if (!cpu_guest_has_conf5) + return -EINVAL; + *v = read_gc0_config5(); + break; +#ifdef CONFIG_64BIT + case KVM_REG_MIPS_CP0_XCONTEXT: + *v = read_gc0_xcontext(); + break; +#endif + case KVM_REG_MIPS_CP0_ERROREPC: + *v = (long)read_gc0_errorepc(); + break; + case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6: + idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2; + if (!cpu_guest_has_kscr(idx)) + return -EINVAL; + switch (idx) { + case 2: + *v = (long)read_gc0_kscratch1(); + break; + case 3: + *v = (long)read_gc0_kscratch2(); + break; + case 4: + *v = (long)read_gc0_kscratch3(); + break; + case 5: + *v = (long)read_gc0_kscratch4(); + break; + case 6: + *v = (long)read_gc0_kscratch5(); + break; + case 7: + *v = (long)read_gc0_kscratch6(); + break; + } + break; + case KVM_REG_MIPS_COUNT_CTL: + *v = vcpu->arch.count_ctl; + break; + case KVM_REG_MIPS_COUNT_RESUME: + *v = ktime_to_ns(vcpu->arch.count_resume); + break; + case KVM_REG_MIPS_COUNT_HZ: + *v = vcpu->arch.count_hz; + break; + default: + return -EINVAL; + } + return 0; +} + +static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu, + const struct kvm_one_reg *reg, + s64 v) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + unsigned int idx; + int ret = 0; + unsigned int cur, change; + + switch (reg->id) { + case KVM_REG_MIPS_CP0_INDEX: + write_gc0_index(v); + break; + case KVM_REG_MIPS_CP0_ENTRYLO0: + write_gc0_entrylo0(entrylo_user_to_kvm(v)); + break; + case KVM_REG_MIPS_CP0_ENTRYLO1: + write_gc0_entrylo1(entrylo_user_to_kvm(v)); + break; + case KVM_REG_MIPS_CP0_CONTEXT: + write_gc0_context(v); + break; + case KVM_REG_MIPS_CP0_USERLOCAL: + if (!cpu_guest_has_userlocal) + return -EINVAL; + write_gc0_userlocal(v); + break; + case KVM_REG_MIPS_CP0_PAGEMASK: + write_gc0_pagemask(v); + break; + case KVM_REG_MIPS_CP0_PAGEGRAIN: + write_gc0_pagegrain(v); + break; + case KVM_REG_MIPS_CP0_WIRED: + change_gc0_wired(MIPSR6_WIRED_WIRED, v); + break; + case KVM_REG_MIPS_CP0_HWRENA: + write_gc0_hwrena(v); + break; + case KVM_REG_MIPS_CP0_BADVADDR: + write_gc0_badvaddr(v); + break; + case KVM_REG_MIPS_CP0_COUNT: + kvm_mips_write_count(vcpu, v); + break; + case KVM_REG_MIPS_CP0_ENTRYHI: + write_gc0_entryhi(v); + break; + case KVM_REG_MIPS_CP0_COMPARE: + kvm_mips_write_compare(vcpu, v, false); + break; + case KVM_REG_MIPS_CP0_STATUS: + write_gc0_status(v); + break; + case KVM_REG_MIPS_CP0_INTCTL: + write_gc0_intctl(v); + break; + case KVM_REG_MIPS_CP0_CAUSE: + /* + * If the timer is stopped or started (DC bit) it must look + * atomic with changes to the timer interrupt pending bit (TI). + * A timer interrupt should not happen in between. + */ + if ((read_gc0_cause() ^ v) & CAUSEF_DC) { + if (v & CAUSEF_DC) { + /* disable timer first */ + kvm_mips_count_disable_cause(vcpu); + change_gc0_cause((u32)~CAUSEF_DC, v); + } else { + /* enable timer last */ + change_gc0_cause((u32)~CAUSEF_DC, v); + kvm_mips_count_enable_cause(vcpu); + } + } else { + write_gc0_cause(v); + } + break; + case KVM_REG_MIPS_CP0_EPC: + write_gc0_epc(v); + break; + case KVM_REG_MIPS_CP0_PRID: + kvm_write_c0_guest_prid(cop0, v); + break; + case KVM_REG_MIPS_CP0_EBASE: + kvm_vz_write_gc0_ebase(v); + break; + case KVM_REG_MIPS_CP0_CONFIG: + cur = read_gc0_config(); + change = (cur ^ v) & kvm_vz_config_user_wrmask(vcpu); + if (change) { + v = cur ^ change; + write_gc0_config(v); + } + break; + case KVM_REG_MIPS_CP0_CONFIG1: + if (!cpu_guest_has_conf1) + break; + cur = read_gc0_config1(); + change = (cur ^ v) & kvm_vz_config1_user_wrmask(vcpu); + if (change) { + v = cur ^ change; + write_gc0_config1(v); + } + break; + case KVM_REG_MIPS_CP0_CONFIG2: + if (!cpu_guest_has_conf2) + break; + cur = read_gc0_config2(); + change = (cur ^ v) & kvm_vz_config2_user_wrmask(vcpu); + if (change) { + v = cur ^ change; + write_gc0_config2(v); + } + break; + case KVM_REG_MIPS_CP0_CONFIG3: + if (!cpu_guest_has_conf3) + break; + cur = read_gc0_config3(); + change = (cur ^ v) & kvm_vz_config3_user_wrmask(vcpu); + if (change) { + v = cur ^ change; + write_gc0_config3(v); + } + break; + case KVM_REG_MIPS_CP0_CONFIG4: + if (!cpu_guest_has_conf4) + break; + cur = read_gc0_config4(); + change = (cur ^ v) & kvm_vz_config4_user_wrmask(vcpu); + if (change) { + v = cur ^ change; + write_gc0_config4(v); + } + break; + case KVM_REG_MIPS_CP0_CONFIG5: + if (!cpu_guest_has_conf5) + break; + cur = read_gc0_config5(); + change = (cur ^ v) & kvm_vz_config5_user_wrmask(vcpu); + if (change) { + v = cur ^ change; + write_gc0_config5(v); + } + break; +#ifdef CONFIG_64BIT + case KVM_REG_MIPS_CP0_XCONTEXT: + write_gc0_xcontext(v); + break; +#endif + case KVM_REG_MIPS_CP0_ERROREPC: + write_gc0_errorepc(v); + break; + case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6: + idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2; + if (!cpu_guest_has_kscr(idx)) + return -EINVAL; + switch (idx) { + case 2: + write_gc0_kscratch1(v); + break; + case 3: + write_gc0_kscratch2(v); + break; + case 4: + write_gc0_kscratch3(v); + break; + case 5: + write_gc0_kscratch4(v); + break; + case 6: + write_gc0_kscratch5(v); + break; + case 7: + write_gc0_kscratch6(v); + break; + } + break; + case KVM_REG_MIPS_COUNT_CTL: + ret = kvm_mips_set_count_ctl(vcpu, v); + break; + case KVM_REG_MIPS_COUNT_RESUME: + ret = kvm_mips_set_count_resume(vcpu, v); + break; + case KVM_REG_MIPS_COUNT_HZ: + ret = kvm_mips_set_count_hz(vcpu, v); + break; + default: + return -EINVAL; + } + return ret; +} + +#define guestid_cache(cpu) (cpu_data[cpu].guestid_cache) +static void kvm_vz_get_new_guestid(unsigned long cpu, struct kvm_vcpu *vcpu) +{ + unsigned long guestid = guestid_cache(cpu); + + if (!(++guestid & GUESTID_MASK)) { + if (cpu_has_vtag_icache) + flush_icache_all(); + + if (!guestid) /* fix version if needed */ + guestid = GUESTID_FIRST_VERSION; + + ++guestid; /* guestid 0 reserved for root */ + + /* start new guestid cycle */ + kvm_vz_local_flush_roottlb_all_guests(); + kvm_vz_local_flush_guesttlb_all(); + } + + guestid_cache(cpu) = guestid; +} + +/* Returns 1 if the guest TLB may be clobbered */ +static int kvm_vz_check_requests(struct kvm_vcpu *vcpu, int cpu) +{ + int ret = 0; + int i; + + if (!vcpu->requests) + return 0; + + if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { + if (cpu_has_guestid) { + /* Drop all GuestIDs for this VCPU */ + for_each_possible_cpu(i) + vcpu->arch.vzguestid[i] = 0; + /* This will clobber guest TLB contents too */ + ret = 1; + } + /* + * For Root ASID Dealias (RAD) we don't do anything here, but we + * still need the request to ensure we recheck asid_flush_mask. + * We can still return 0 as only the root TLB will be affected + * by a root ASID flush. + */ + } + + return ret; +} + +static void kvm_vz_vcpu_save_wired(struct kvm_vcpu *vcpu) +{ + unsigned int wired = read_gc0_wired(); + struct kvm_mips_tlb *tlbs; + int i; + + /* Expand the wired TLB array if necessary */ + wired &= MIPSR6_WIRED_WIRED; + if (wired > vcpu->arch.wired_tlb_limit) { + tlbs = krealloc(vcpu->arch.wired_tlb, wired * + sizeof(*vcpu->arch.wired_tlb), GFP_ATOMIC); + if (WARN_ON(!tlbs)) { + /* Save whatever we can */ + wired = vcpu->arch.wired_tlb_limit; + } else { + vcpu->arch.wired_tlb = tlbs; + vcpu->arch.wired_tlb_limit = wired; + } + } + + if (wired) + /* Save wired entries from the guest TLB */ + kvm_vz_save_guesttlb(vcpu->arch.wired_tlb, 0, wired); + /* Invalidate any dropped entries since last time */ + for (i = wired; i < vcpu->arch.wired_tlb_used; ++i) { + vcpu->arch.wired_tlb[i].tlb_hi = UNIQUE_GUEST_ENTRYHI(i); + vcpu->arch.wired_tlb[i].tlb_lo[0] = 0; + vcpu->arch.wired_tlb[i].tlb_lo[1] = 0; + vcpu->arch.wired_tlb[i].tlb_mask = 0; + } + vcpu->arch.wired_tlb_used = wired; +} + +static void kvm_vz_vcpu_load_wired(struct kvm_vcpu *vcpu) +{ + /* Load wired entries into the guest TLB */ + if (vcpu->arch.wired_tlb) + kvm_vz_load_guesttlb(vcpu->arch.wired_tlb, 0, + vcpu->arch.wired_tlb_used); +} + +static void kvm_vz_vcpu_load_tlb(struct kvm_vcpu *vcpu, int cpu) +{ + struct kvm *kvm = vcpu->kvm; + struct mm_struct *gpa_mm = &kvm->arch.gpa_mm; + bool migrated; + + /* + * Are we entering guest context on a different CPU to last time? + * If so, the VCPU's guest TLB state on this CPU may be stale. + */ + migrated = (vcpu->arch.last_exec_cpu != cpu); + vcpu->arch.last_exec_cpu = cpu; + + /* + * A vcpu's GuestID is set in GuestCtl1.ID when the vcpu is loaded and + * remains set until another vcpu is loaded in. As a rule GuestRID + * remains zeroed when in root context unless the kernel is busy + * manipulating guest tlb entries. + */ + if (cpu_has_guestid) { + /* + * Check if our GuestID is of an older version and thus invalid. + * + * We also discard the stored GuestID if we've executed on + * another CPU, as the guest mappings may have changed without + * hypervisor knowledge. + */ + if (migrated || + (vcpu->arch.vzguestid[cpu] ^ guestid_cache(cpu)) & + GUESTID_VERSION_MASK) { + kvm_vz_get_new_guestid(cpu, vcpu); + vcpu->arch.vzguestid[cpu] = guestid_cache(cpu); + trace_kvm_guestid_change(vcpu, + vcpu->arch.vzguestid[cpu]); + } + + /* Restore GuestID */ + change_c0_guestctl1(GUESTID_MASK, vcpu->arch.vzguestid[cpu]); + } else { + /* + * The Guest TLB only stores a single guest's TLB state, so + * flush it if another VCPU has executed on this CPU. + * + * We also flush if we've executed on another CPU, as the guest + * mappings may have changed without hypervisor knowledge. + */ + if (migrated || last_exec_vcpu[cpu] != vcpu) + kvm_vz_local_flush_guesttlb_all(); + last_exec_vcpu[cpu] = vcpu; + + /* + * Root ASID dealiases guest GPA mappings in the root TLB. + * Allocate new root ASID if needed. + */ + if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask) + || (cpu_context(cpu, gpa_mm) ^ asid_cache(cpu)) & + asid_version_mask(cpu)) + get_new_mmu_context(gpa_mm, cpu); + } +} + +static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + bool migrated, all; + + /* + * Have we migrated to a different CPU? + * If so, any old guest TLB state may be stale. + */ + migrated = (vcpu->arch.last_sched_cpu != cpu); + + /* + * Was this the last VCPU to run on this CPU? + * If not, any old guest state from this VCPU will have been clobbered. + */ + all = migrated || (last_vcpu[cpu] != vcpu); + last_vcpu[cpu] = vcpu; + + /* + * Restore CP0_Wired unconditionally as we clear it after use, and + * restore wired guest TLB entries (while in guest context). + */ + kvm_restore_gc0_wired(cop0); + if (current->flags & PF_VCPU) { + tlbw_use_hazard(); + kvm_vz_vcpu_load_tlb(vcpu, cpu); + kvm_vz_vcpu_load_wired(vcpu); + } + + /* + * Restore timer state regardless, as e.g. Cause.TI can change over time + * if left unmaintained. + */ + kvm_vz_restore_timer(vcpu); + + /* Don't bother restoring registers multiple times unless necessary */ + if (!all) + return 0; + + /* + * Restore config registers first, as some implementations restrict + * writes to other registers when the corresponding feature bits aren't + * set. For example Status.CU1 cannot be set unless Config1.FP is set. + */ + kvm_restore_gc0_config(cop0); + if (cpu_guest_has_conf1) + kvm_restore_gc0_config1(cop0); + if (cpu_guest_has_conf2) + kvm_restore_gc0_config2(cop0); + if (cpu_guest_has_conf3) + kvm_restore_gc0_config3(cop0); + if (cpu_guest_has_conf4) + kvm_restore_gc0_config4(cop0); + if (cpu_guest_has_conf5) + kvm_restore_gc0_config5(cop0); + if (cpu_guest_has_conf6) + kvm_restore_gc0_config6(cop0); + if (cpu_guest_has_conf7) + kvm_restore_gc0_config7(cop0); + + kvm_restore_gc0_index(cop0); + kvm_restore_gc0_entrylo0(cop0); + kvm_restore_gc0_entrylo1(cop0); + kvm_restore_gc0_context(cop0); +#ifdef CONFIG_64BIT + kvm_restore_gc0_xcontext(cop0); +#endif + kvm_restore_gc0_pagemask(cop0); + kvm_restore_gc0_pagegrain(cop0); + kvm_restore_gc0_hwrena(cop0); + kvm_restore_gc0_badvaddr(cop0); + kvm_restore_gc0_entryhi(cop0); + kvm_restore_gc0_status(cop0); + kvm_restore_gc0_intctl(cop0); + kvm_restore_gc0_epc(cop0); + kvm_vz_write_gc0_ebase(kvm_read_sw_gc0_ebase(cop0)); + if (cpu_guest_has_userlocal) + kvm_restore_gc0_userlocal(cop0); + + kvm_restore_gc0_errorepc(cop0); + + /* restore KScratch registers if enabled in guest */ + if (cpu_guest_has_conf4) { + if (cpu_guest_has_kscr(2)) + kvm_restore_gc0_kscratch1(cop0); + if (cpu_guest_has_kscr(3)) + kvm_restore_gc0_kscratch2(cop0); + if (cpu_guest_has_kscr(4)) + kvm_restore_gc0_kscratch3(cop0); + if (cpu_guest_has_kscr(5)) + kvm_restore_gc0_kscratch4(cop0); + if (cpu_guest_has_kscr(6)) + kvm_restore_gc0_kscratch5(cop0); + if (cpu_guest_has_kscr(7)) + kvm_restore_gc0_kscratch6(cop0); + } + + /* restore Root.GuestCtl2 from unused Guest guestctl2 register */ + if (cpu_has_guestctl2) + write_c0_guestctl2( + cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL]); + + return 0; +} + +static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + + if (current->flags & PF_VCPU) + kvm_vz_vcpu_save_wired(vcpu); + + kvm_lose_fpu(vcpu); + + kvm_save_gc0_index(cop0); + kvm_save_gc0_entrylo0(cop0); + kvm_save_gc0_entrylo1(cop0); + kvm_save_gc0_context(cop0); +#ifdef CONFIG_64BIT + kvm_save_gc0_xcontext(cop0); +#endif + kvm_save_gc0_pagemask(cop0); + kvm_save_gc0_pagegrain(cop0); + kvm_save_gc0_wired(cop0); + /* allow wired TLB entries to be overwritten */ + clear_gc0_wired(MIPSR6_WIRED_WIRED); + kvm_save_gc0_hwrena(cop0); + kvm_save_gc0_badvaddr(cop0); + kvm_save_gc0_entryhi(cop0); + kvm_save_gc0_status(cop0); + kvm_save_gc0_intctl(cop0); + kvm_save_gc0_epc(cop0); + kvm_write_sw_gc0_ebase(cop0, kvm_vz_read_gc0_ebase()); + if (cpu_guest_has_userlocal) + kvm_save_gc0_userlocal(cop0); + + /* only save implemented config registers */ + kvm_save_gc0_config(cop0); + if (cpu_guest_has_conf1) + kvm_save_gc0_config1(cop0); + if (cpu_guest_has_conf2) + kvm_save_gc0_config2(cop0); + if (cpu_guest_has_conf3) + kvm_save_gc0_config3(cop0); + if (cpu_guest_has_conf4) + kvm_save_gc0_config4(cop0); + if (cpu_guest_has_conf5) + kvm_save_gc0_config5(cop0); + if (cpu_guest_has_conf6) + kvm_save_gc0_config6(cop0); + if (cpu_guest_has_conf7) + kvm_save_gc0_config7(cop0); + + kvm_save_gc0_errorepc(cop0); + + /* save KScratch registers if enabled in guest */ + if (cpu_guest_has_conf4) { + if (cpu_guest_has_kscr(2)) + kvm_save_gc0_kscratch1(cop0); + if (cpu_guest_has_kscr(3)) + kvm_save_gc0_kscratch2(cop0); + if (cpu_guest_has_kscr(4)) + kvm_save_gc0_kscratch3(cop0); + if (cpu_guest_has_kscr(5)) + kvm_save_gc0_kscratch4(cop0); + if (cpu_guest_has_kscr(6)) + kvm_save_gc0_kscratch5(cop0); + if (cpu_guest_has_kscr(7)) + kvm_save_gc0_kscratch6(cop0); + } + + kvm_vz_save_timer(vcpu); + + /* save Root.GuestCtl2 in unused Guest guestctl2 register */ + if (cpu_has_guestctl2) + cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] = + read_c0_guestctl2(); + + return 0; +} + +/** + * kvm_vz_resize_guest_vtlb() - Attempt to resize guest VTLB. + * @size: Number of guest VTLB entries (0 < @size <= root VTLB entries). + * + * Attempt to resize the guest VTLB by writing guest Config registers. This is + * necessary for cores with a shared root/guest TLB to avoid overlap with wired + * entries in the root VTLB. + * + * Returns: The resulting guest VTLB size. + */ +static unsigned int kvm_vz_resize_guest_vtlb(unsigned int size) +{ + unsigned int config4 = 0, ret = 0, limit; + + /* Write MMUSize - 1 into guest Config registers */ + if (cpu_guest_has_conf1) + change_gc0_config1(MIPS_CONF1_TLBS, + (size - 1) << MIPS_CONF1_TLBS_SHIFT); + if (cpu_guest_has_conf4) { + config4 = read_gc0_config4(); + if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) == + MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT) { + config4 &= ~MIPS_CONF4_VTLBSIZEEXT; + config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) << + MIPS_CONF4_VTLBSIZEEXT_SHIFT; + } else if ((config4 & MIPS_CONF4_MMUEXTDEF) == + MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT) { + config4 &= ~MIPS_CONF4_MMUSIZEEXT; + config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) << + MIPS_CONF4_MMUSIZEEXT_SHIFT; + } + write_gc0_config4(config4); + } + + /* + * Set Guest.Wired.Limit = 0 (no limit up to Guest.MMUSize-1), unless it + * would exceed Root.Wired.Limit (clearing Guest.Wired.Wired so write + * not dropped) + */ + if (cpu_has_mips_r6) { + limit = (read_c0_wired() & MIPSR6_WIRED_LIMIT) >> + MIPSR6_WIRED_LIMIT_SHIFT; + if (size - 1 <= limit) + limit = 0; + write_gc0_wired(limit << MIPSR6_WIRED_LIMIT_SHIFT); + } + + /* Read back MMUSize - 1 */ + back_to_back_c0_hazard(); + if (cpu_guest_has_conf1) + ret = (read_gc0_config1() & MIPS_CONF1_TLBS) >> + MIPS_CONF1_TLBS_SHIFT; + if (config4) { + if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) == + MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT) + ret |= ((config4 & MIPS_CONF4_VTLBSIZEEXT) >> + MIPS_CONF4_VTLBSIZEEXT_SHIFT) << + MIPS_CONF1_TLBS_SIZE; + else if ((config4 & MIPS_CONF4_MMUEXTDEF) == + MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT) + ret |= ((config4 & MIPS_CONF4_MMUSIZEEXT) >> + MIPS_CONF4_MMUSIZEEXT_SHIFT) << + MIPS_CONF1_TLBS_SIZE; + } + return ret + 1; +} + +static int kvm_vz_hardware_enable(void) +{ + unsigned int mmu_size, guest_mmu_size, ftlb_size; + + /* + * ImgTec cores tend to use a shared root/guest TLB. To avoid overlap of + * root wired and guest entries, the guest TLB may need resizing. + */ + mmu_size = current_cpu_data.tlbsizevtlb; + ftlb_size = current_cpu_data.tlbsize - mmu_size; + + /* Try switching to maximum guest VTLB size for flush */ + guest_mmu_size = kvm_vz_resize_guest_vtlb(mmu_size); + current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size; + kvm_vz_local_flush_guesttlb_all(); + + /* + * Reduce to make space for root wired entries and at least 2 root + * non-wired entries. This does assume that long-term wired entries + * won't be added later. + */ + guest_mmu_size = mmu_size - num_wired_entries() - 2; + guest_mmu_size = kvm_vz_resize_guest_vtlb(guest_mmu_size); + current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size; + + /* + * Write the VTLB size, but if another CPU has already written, check it + * matches or we won't provide a consistent view to the guest. If this + * ever happens it suggests an asymmetric number of wired entries. + */ + if (cmpxchg(&kvm_vz_guest_vtlb_size, 0, guest_mmu_size) && + WARN(guest_mmu_size != kvm_vz_guest_vtlb_size, + "Available guest VTLB size mismatch")) + return -EINVAL; + + /* + * Enable virtualization features granting guest direct control of + * certain features: + * CP0=1: Guest coprocessor 0 context. + * AT=Guest: Guest MMU. + * CG=1: Hit (virtual address) CACHE operations (optional). + * CF=1: Guest Config registers. + * CGI=1: Indexed flush CACHE operations (optional). + */ + write_c0_guestctl0(MIPS_GCTL0_CP0 | + (MIPS_GCTL0_AT_GUEST << MIPS_GCTL0_AT_SHIFT) | + MIPS_GCTL0_CG | MIPS_GCTL0_CF); + if (cpu_has_guestctl0ext) + set_c0_guestctl0ext(MIPS_GCTL0EXT_CGI); + + if (cpu_has_guestid) { + write_c0_guestctl1(0); + kvm_vz_local_flush_roottlb_all_guests(); + + GUESTID_MASK = current_cpu_data.guestid_mask; + GUESTID_FIRST_VERSION = GUESTID_MASK + 1; + GUESTID_VERSION_MASK = ~GUESTID_MASK; + + current_cpu_data.guestid_cache = GUESTID_FIRST_VERSION; + } + + /* clear any pending injected virtual guest interrupts */ + if (cpu_has_guestctl2) + clear_c0_guestctl2(0x3f << 10); + + return 0; +} + +static void kvm_vz_hardware_disable(void) +{ + kvm_vz_local_flush_guesttlb_all(); + + if (cpu_has_guestid) { + write_c0_guestctl1(0); + kvm_vz_local_flush_roottlb_all_guests(); + } +} + +static int kvm_vz_check_extension(struct kvm *kvm, long ext) +{ + int r; + + switch (ext) { + case KVM_CAP_MIPS_VZ: + /* we wouldn't be here unless cpu_has_vz */ + r = 1; + break; +#ifdef CONFIG_64BIT + case KVM_CAP_MIPS_64BIT: + /* We support 64-bit registers/operations and addresses */ + r = 2; + break; +#endif + default: + r = 0; + break; + } + + return r; +} + +static int kvm_vz_vcpu_init(struct kvm_vcpu *vcpu) +{ + int i; + + for_each_possible_cpu(i) + vcpu->arch.vzguestid[i] = 0; + + return 0; +} + +static void kvm_vz_vcpu_uninit(struct kvm_vcpu *vcpu) +{ + int cpu; + + /* + * If the VCPU is freed and reused as another VCPU, we don't want the + * matching pointer wrongly hanging around in last_vcpu[] or + * last_exec_vcpu[]. + */ + for_each_possible_cpu(cpu) { + if (last_vcpu[cpu] == vcpu) + last_vcpu[cpu] = NULL; + if (last_exec_vcpu[cpu] == vcpu) + last_exec_vcpu[cpu] = NULL; + } +} + +static int kvm_vz_vcpu_setup(struct kvm_vcpu *vcpu) +{ + struct mips_coproc *cop0 = vcpu->arch.cop0; + unsigned long count_hz = 100*1000*1000; /* default to 100 MHz */ + + /* + * Start off the timer at the same frequency as the host timer, but the + * soft timer doesn't handle frequencies greater than 1GHz yet. + */ + if (mips_hpt_frequency && mips_hpt_frequency <= NSEC_PER_SEC) + count_hz = mips_hpt_frequency; + kvm_mips_init_count(vcpu, count_hz); + + /* + * Initialize guest register state to valid architectural reset state. + */ + + /* PageGrain */ + if (cpu_has_mips_r6) + kvm_write_sw_gc0_pagegrain(cop0, PG_RIE | PG_XIE | PG_IEC); + /* Wired */ + if (cpu_has_mips_r6) + kvm_write_sw_gc0_wired(cop0, + read_gc0_wired() & MIPSR6_WIRED_LIMIT); + /* Status */ + kvm_write_sw_gc0_status(cop0, ST0_BEV | ST0_ERL); + if (cpu_has_mips_r6) + kvm_change_sw_gc0_status(cop0, ST0_FR, read_gc0_status()); + /* IntCtl */ + kvm_write_sw_gc0_intctl(cop0, read_gc0_intctl() & + (INTCTLF_IPFDC | INTCTLF_IPPCI | INTCTLF_IPTI)); + /* PRId */ + kvm_write_sw_gc0_prid(cop0, boot_cpu_data.processor_id); + /* EBase */ + kvm_write_sw_gc0_ebase(cop0, (s32)0x80000000 | vcpu->vcpu_id); + /* Config */ + kvm_save_gc0_config(cop0); + /* architecturally writable (e.g. from guest) */ + kvm_change_sw_gc0_config(cop0, CONF_CM_CMASK, + _page_cachable_default >> _CACHE_SHIFT); + /* architecturally read only, but maybe writable from root */ + kvm_change_sw_gc0_config(cop0, MIPS_CONF_MT, read_c0_config()); + if (cpu_guest_has_conf1) { + kvm_set_sw_gc0_config(cop0, MIPS_CONF_M); + /* Config1 */ + kvm_save_gc0_config1(cop0); + /* architecturally read only, but maybe writable from root */ + kvm_clear_sw_gc0_config1(cop0, MIPS_CONF1_C2 | + MIPS_CONF1_MD | + MIPS_CONF1_PC | + MIPS_CONF1_WR | + MIPS_CONF1_CA | + MIPS_CONF1_FP); + } + if (cpu_guest_has_conf2) { + kvm_set_sw_gc0_config1(cop0, MIPS_CONF_M); + /* Config2 */ + kvm_save_gc0_config2(cop0); + } + if (cpu_guest_has_conf3) { + kvm_set_sw_gc0_config2(cop0, MIPS_CONF_M); + /* Config3 */ + kvm_save_gc0_config3(cop0); + /* architecturally writable (e.g. from guest) */ + kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_ISA_OE); + /* architecturally read only, but maybe writable from root */ + kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_MSA | + MIPS_CONF3_BPG | + MIPS_CONF3_ULRI | + MIPS_CONF3_DSP | + MIPS_CONF3_CTXTC | + MIPS_CONF3_ITL | + MIPS_CONF3_LPA | + MIPS_CONF3_VEIC | + MIPS_CONF3_VINT | + MIPS_CONF3_SP | + MIPS_CONF3_CDMM | + MIPS_CONF3_MT | + MIPS_CONF3_SM | + MIPS_CONF3_TL); + } + if (cpu_guest_has_conf4) { + kvm_set_sw_gc0_config3(cop0, MIPS_CONF_M); + /* Config4 */ + kvm_save_gc0_config4(cop0); + } + if (cpu_guest_has_conf5) { + kvm_set_sw_gc0_config4(cop0, MIPS_CONF_M); + /* Config5 */ + kvm_save_gc0_config5(cop0); + /* architecturally writable (e.g. from guest) */ + kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_K | + MIPS_CONF5_CV | + MIPS_CONF5_MSAEN | + MIPS_CONF5_UFE | + MIPS_CONF5_FRE | + MIPS_CONF5_SBRI | + MIPS_CONF5_UFR); + /* architecturally read only, but maybe writable from root */ + kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_MRP); + } + + /* start with no pending virtual guest interrupts */ + if (cpu_has_guestctl2) + cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] = 0; + + /* Put PC at reset vector */ + vcpu->arch.pc = CKSEG1ADDR(0x1fc00000); + + return 0; +} + +static void kvm_vz_flush_shadow_all(struct kvm *kvm) +{ + if (cpu_has_guestid) { + /* Flush GuestID for each VCPU individually */ + kvm_flush_remote_tlbs(kvm); + } else { + /* + * For each CPU there is a single GPA ASID used by all VCPUs in + * the VM, so it doesn't make sense for the VCPUs to handle + * invalidation of these ASIDs individually. + * + * Instead mark all CPUs as needing ASID invalidation in + * asid_flush_mask, and just use kvm_flush_remote_tlbs(kvm) to + * kick any running VCPUs so they check asid_flush_mask. + */ + cpumask_setall(&kvm->arch.asid_flush_mask); + kvm_flush_remote_tlbs(kvm); + } +} + +static void kvm_vz_flush_shadow_memslot(struct kvm *kvm, + const struct kvm_memory_slot *slot) +{ + kvm_vz_flush_shadow_all(kvm); +} + +static void kvm_vz_vcpu_reenter(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + int cpu = smp_processor_id(); + int preserve_guest_tlb; + + preserve_guest_tlb = kvm_vz_check_requests(vcpu, cpu); + + if (preserve_guest_tlb) + kvm_vz_vcpu_save_wired(vcpu); + + kvm_vz_vcpu_load_tlb(vcpu, cpu); + + if (preserve_guest_tlb) + kvm_vz_vcpu_load_wired(vcpu); +} + +static int kvm_vz_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + int cpu = smp_processor_id(); + int r; + + /* Check if we have any exceptions/interrupts pending */ + kvm_mips_deliver_interrupts(vcpu, read_gc0_cause()); + + kvm_vz_check_requests(vcpu, cpu); + kvm_vz_vcpu_load_tlb(vcpu, cpu); + kvm_vz_vcpu_load_wired(vcpu); + + r = vcpu->arch.vcpu_run(run, vcpu); + + kvm_vz_vcpu_save_wired(vcpu); + + return r; +} + +static struct kvm_mips_callbacks kvm_vz_callbacks = { + .handle_cop_unusable = kvm_trap_vz_handle_cop_unusable, + .handle_tlb_mod = kvm_trap_vz_handle_tlb_st_miss, + .handle_tlb_ld_miss = kvm_trap_vz_handle_tlb_ld_miss, + .handle_tlb_st_miss = kvm_trap_vz_handle_tlb_st_miss, + .handle_addr_err_st = kvm_trap_vz_no_handler, + .handle_addr_err_ld = kvm_trap_vz_no_handler, + .handle_syscall = kvm_trap_vz_no_handler, + .handle_res_inst = kvm_trap_vz_no_handler, + .handle_break = kvm_trap_vz_no_handler, + .handle_msa_disabled = kvm_trap_vz_handle_msa_disabled, + .handle_guest_exit = kvm_trap_vz_handle_guest_exit, + + .hardware_enable = kvm_vz_hardware_enable, + .hardware_disable = kvm_vz_hardware_disable, + .check_extension = kvm_vz_check_extension, + .vcpu_init = kvm_vz_vcpu_init, + .vcpu_uninit = kvm_vz_vcpu_uninit, + .vcpu_setup = kvm_vz_vcpu_setup, + .flush_shadow_all = kvm_vz_flush_shadow_all, + .flush_shadow_memslot = kvm_vz_flush_shadow_memslot, + .gva_to_gpa = kvm_vz_gva_to_gpa_cb, + .queue_timer_int = kvm_vz_queue_timer_int_cb, + .dequeue_timer_int = kvm_vz_dequeue_timer_int_cb, + .queue_io_int = kvm_vz_queue_io_int_cb, + .dequeue_io_int = kvm_vz_dequeue_io_int_cb, + .irq_deliver = kvm_vz_irq_deliver_cb, + .irq_clear = kvm_vz_irq_clear_cb, + .num_regs = kvm_vz_num_regs, + .copy_reg_indices = kvm_vz_copy_reg_indices, + .get_one_reg = kvm_vz_get_one_reg, + .set_one_reg = kvm_vz_set_one_reg, + .vcpu_load = kvm_vz_vcpu_load, + .vcpu_put = kvm_vz_vcpu_put, + .vcpu_run = kvm_vz_vcpu_run, + .vcpu_reenter = kvm_vz_vcpu_reenter, +}; + +int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks) +{ + if (!cpu_has_vz) + return -ENODEV; + + /* + * VZ requires at least 2 KScratch registers, so it should have been + * possible to allocate pgd_reg. + */ + if (WARN(pgd_reg == -1, + "pgd_reg not allocated even though cpu_has_vz\n")) + return -ENODEV; + + pr_info("Starting KVM with MIPS VZ extensions\n"); + + *install_callbacks = &kvm_vz_callbacks; + return 0; +} |