diff options
Diffstat (limited to 'kernel/arch/powerpc/kvm/book3s_hv.c')
| -rw-r--r-- | kernel/arch/powerpc/kvm/book3s_hv.c | 2765 |
1 files changed, 2765 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/kvm/book3s_hv.c b/kernel/arch/powerpc/kvm/book3s_hv.c new file mode 100644 index 000000000..3e9087f45 --- /dev/null +++ b/kernel/arch/powerpc/kvm/book3s_hv.c @@ -0,0 +1,2765 @@ +/* + * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> + * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved. + * + * Authors: + * Paul Mackerras <paulus@au1.ibm.com> + * Alexander Graf <agraf@suse.de> + * Kevin Wolf <mail@kevin-wolf.de> + * + * Description: KVM functions specific to running on Book 3S + * processors in hypervisor mode (specifically POWER7 and later). + * + * This file is derived from arch/powerpc/kvm/book3s.c, + * by Alexander Graf <agraf@suse.de>. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + */ + +#include <linux/kvm_host.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/preempt.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/export.h> +#include <linux/fs.h> +#include <linux/anon_inodes.h> +#include <linux/cpumask.h> +#include <linux/spinlock.h> +#include <linux/page-flags.h> +#include <linux/srcu.h> +#include <linux/miscdevice.h> +#include <linux/debugfs.h> + +#include <asm/reg.h> +#include <asm/cputable.h> +#include <asm/cache.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> +#include <asm/uaccess.h> +#include <asm/io.h> +#include <asm/kvm_ppc.h> +#include <asm/kvm_book3s.h> +#include <asm/mmu_context.h> +#include <asm/lppaca.h> +#include <asm/processor.h> +#include <asm/cputhreads.h> +#include <asm/page.h> +#include <asm/hvcall.h> +#include <asm/switch_to.h> +#include <asm/smp.h> +#include <asm/dbell.h> +#include <linux/gfp.h> +#include <linux/vmalloc.h> +#include <linux/highmem.h> +#include <linux/hugetlb.h> +#include <linux/module.h> + +#include "book3s.h" + +#define CREATE_TRACE_POINTS +#include "trace_hv.h" + +/* #define EXIT_DEBUG */ +/* #define EXIT_DEBUG_SIMPLE */ +/* #define EXIT_DEBUG_INT */ + +/* Used to indicate that a guest page fault needs to be handled */ +#define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1) + +/* Used as a "null" value for timebase values */ +#define TB_NIL (~(u64)0) + +static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1); + +#if defined(CONFIG_PPC_64K_PAGES) +#define MPP_BUFFER_ORDER 0 +#elif defined(CONFIG_PPC_4K_PAGES) +#define MPP_BUFFER_ORDER 3 +#endif + + +static void kvmppc_end_cede(struct kvm_vcpu *vcpu); +static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); + +static bool kvmppc_ipi_thread(int cpu) +{ + /* On POWER8 for IPIs to threads in the same core, use msgsnd */ + if (cpu_has_feature(CPU_FTR_ARCH_207S)) { + preempt_disable(); + if (cpu_first_thread_sibling(cpu) == + cpu_first_thread_sibling(smp_processor_id())) { + unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); + msg |= cpu_thread_in_core(cpu); + smp_mb(); + __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); + preempt_enable(); + return true; + } + preempt_enable(); + } + +#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) + if (cpu >= 0 && cpu < nr_cpu_ids && paca[cpu].kvm_hstate.xics_phys) { + xics_wake_cpu(cpu); + return true; + } +#endif + + return false; +} + +static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu) +{ + int cpu = vcpu->cpu; + struct swait_head *wqp; + + wqp = kvm_arch_vcpu_wq(vcpu); + if (swaitqueue_active(wqp)) { + swait_wake_interruptible(wqp); + ++vcpu->stat.halt_wakeup; + } + + if (kvmppc_ipi_thread(cpu + vcpu->arch.ptid)) + return; + + /* CPU points to the first thread of the core */ + if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu)) + smp_send_reschedule(cpu); +} + +/* + * We use the vcpu_load/put functions to measure stolen time. + * Stolen time is counted as time when either the vcpu is able to + * run as part of a virtual core, but the task running the vcore + * is preempted or sleeping, or when the vcpu needs something done + * in the kernel by the task running the vcpu, but that task is + * preempted or sleeping. Those two things have to be counted + * separately, since one of the vcpu tasks will take on the job + * of running the core, and the other vcpu tasks in the vcore will + * sleep waiting for it to do that, but that sleep shouldn't count + * as stolen time. + * + * Hence we accumulate stolen time when the vcpu can run as part of + * a vcore using vc->stolen_tb, and the stolen time when the vcpu + * needs its task to do other things in the kernel (for example, + * service a page fault) in busy_stolen. We don't accumulate + * stolen time for a vcore when it is inactive, or for a vcpu + * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of + * a misnomer; it means that the vcpu task is not executing in + * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in + * the kernel. We don't have any way of dividing up that time + * between time that the vcpu is genuinely stopped, time that + * the task is actively working on behalf of the vcpu, and time + * that the task is preempted, so we don't count any of it as + * stolen. + * + * Updates to busy_stolen are protected by arch.tbacct_lock; + * updates to vc->stolen_tb are protected by the vcore->stoltb_lock + * lock. The stolen times are measured in units of timebase ticks. + * (Note that the != TB_NIL checks below are purely defensive; + * they should never fail.) + */ + +static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu) +{ + struct kvmppc_vcore *vc = vcpu->arch.vcore; + unsigned long flags; + + /* + * We can test vc->runner without taking the vcore lock, + * because only this task ever sets vc->runner to this + * vcpu, and once it is set to this vcpu, only this task + * ever sets it to NULL. + */ + if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE) { + spin_lock_irqsave(&vc->stoltb_lock, flags); + if (vc->preempt_tb != TB_NIL) { + vc->stolen_tb += mftb() - vc->preempt_tb; + vc->preempt_tb = TB_NIL; + } + spin_unlock_irqrestore(&vc->stoltb_lock, flags); + } + spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); + if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST && + vcpu->arch.busy_preempt != TB_NIL) { + vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt; + vcpu->arch.busy_preempt = TB_NIL; + } + spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); +} + +static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu) +{ + struct kvmppc_vcore *vc = vcpu->arch.vcore; + unsigned long flags; + + if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE) { + spin_lock_irqsave(&vc->stoltb_lock, flags); + vc->preempt_tb = mftb(); + spin_unlock_irqrestore(&vc->stoltb_lock, flags); + } + spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); + if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) + vcpu->arch.busy_preempt = mftb(); + spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); +} + +static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr) +{ + vcpu->arch.shregs.msr = msr; + kvmppc_end_cede(vcpu); +} + +void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) +{ + vcpu->arch.pvr = pvr; +} + +int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) +{ + unsigned long pcr = 0; + struct kvmppc_vcore *vc = vcpu->arch.vcore; + + if (arch_compat) { + switch (arch_compat) { + case PVR_ARCH_205: + /* + * If an arch bit is set in PCR, all the defined + * higher-order arch bits also have to be set. + */ + pcr = PCR_ARCH_206 | PCR_ARCH_205; + break; + case PVR_ARCH_206: + case PVR_ARCH_206p: + pcr = PCR_ARCH_206; + break; + case PVR_ARCH_207: + break; + default: + return -EINVAL; + } + + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) { + /* POWER7 can't emulate POWER8 */ + if (!(pcr & PCR_ARCH_206)) + return -EINVAL; + pcr &= ~PCR_ARCH_206; + } + } + + spin_lock(&vc->lock); + vc->arch_compat = arch_compat; + vc->pcr = pcr; + spin_unlock(&vc->lock); + + return 0; +} + +void kvmppc_dump_regs(struct kvm_vcpu *vcpu) +{ + int r; + + pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id); + pr_err("pc = %.16lx msr = %.16llx trap = %x\n", + vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap); + for (r = 0; r < 16; ++r) + pr_err("r%2d = %.16lx r%d = %.16lx\n", + r, kvmppc_get_gpr(vcpu, r), + r+16, kvmppc_get_gpr(vcpu, r+16)); + pr_err("ctr = %.16lx lr = %.16lx\n", + vcpu->arch.ctr, vcpu->arch.lr); + pr_err("srr0 = %.16llx srr1 = %.16llx\n", + vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1); + pr_err("sprg0 = %.16llx sprg1 = %.16llx\n", + vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1); + pr_err("sprg2 = %.16llx sprg3 = %.16llx\n", + vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3); + pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n", + vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr); + pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar); + pr_err("fault dar = %.16lx dsisr = %.8x\n", + vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); + pr_err("SLB (%d entries):\n", vcpu->arch.slb_max); + for (r = 0; r < vcpu->arch.slb_max; ++r) + pr_err(" ESID = %.16llx VSID = %.16llx\n", + vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv); + pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n", + vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1, + vcpu->arch.last_inst); +} + +struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id) +{ + int r; + struct kvm_vcpu *v, *ret = NULL; + + mutex_lock(&kvm->lock); + kvm_for_each_vcpu(r, v, kvm) { + if (v->vcpu_id == id) { + ret = v; + break; + } + } + mutex_unlock(&kvm->lock); + return ret; +} + +static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa) +{ + vpa->__old_status |= LPPACA_OLD_SHARED_PROC; + vpa->yield_count = cpu_to_be32(1); +} + +static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v, + unsigned long addr, unsigned long len) +{ + /* check address is cacheline aligned */ + if (addr & (L1_CACHE_BYTES - 1)) + return -EINVAL; + spin_lock(&vcpu->arch.vpa_update_lock); + if (v->next_gpa != addr || v->len != len) { + v->next_gpa = addr; + v->len = addr ? len : 0; + v->update_pending = 1; + } + spin_unlock(&vcpu->arch.vpa_update_lock); + return 0; +} + +/* Length for a per-processor buffer is passed in at offset 4 in the buffer */ +struct reg_vpa { + u32 dummy; + union { + __be16 hword; + __be32 word; + } length; +}; + +static int vpa_is_registered(struct kvmppc_vpa *vpap) +{ + if (vpap->update_pending) + return vpap->next_gpa != 0; + return vpap->pinned_addr != NULL; +} + +static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, + unsigned long flags, + unsigned long vcpuid, unsigned long vpa) +{ + struct kvm *kvm = vcpu->kvm; + unsigned long len, nb; + void *va; + struct kvm_vcpu *tvcpu; + int err; + int subfunc; + struct kvmppc_vpa *vpap; + + tvcpu = kvmppc_find_vcpu(kvm, vcpuid); + if (!tvcpu) + return H_PARAMETER; + + subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK; + if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL || + subfunc == H_VPA_REG_SLB) { + /* Registering new area - address must be cache-line aligned */ + if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa) + return H_PARAMETER; + + /* convert logical addr to kernel addr and read length */ + va = kvmppc_pin_guest_page(kvm, vpa, &nb); + if (va == NULL) + return H_PARAMETER; + if (subfunc == H_VPA_REG_VPA) + len = be16_to_cpu(((struct reg_vpa *)va)->length.hword); + else + len = be32_to_cpu(((struct reg_vpa *)va)->length.word); + kvmppc_unpin_guest_page(kvm, va, vpa, false); + + /* Check length */ + if (len > nb || len < sizeof(struct reg_vpa)) + return H_PARAMETER; + } else { + vpa = 0; + len = 0; + } + + err = H_PARAMETER; + vpap = NULL; + spin_lock(&tvcpu->arch.vpa_update_lock); + + switch (subfunc) { + case H_VPA_REG_VPA: /* register VPA */ + if (len < sizeof(struct lppaca)) + break; + vpap = &tvcpu->arch.vpa; + err = 0; + break; + + case H_VPA_REG_DTL: /* register DTL */ + if (len < sizeof(struct dtl_entry)) + break; + len -= len % sizeof(struct dtl_entry); + + /* Check that they have previously registered a VPA */ + err = H_RESOURCE; + if (!vpa_is_registered(&tvcpu->arch.vpa)) + break; + + vpap = &tvcpu->arch.dtl; + err = 0; + break; + + case H_VPA_REG_SLB: /* register SLB shadow buffer */ + /* Check that they have previously registered a VPA */ + err = H_RESOURCE; + if (!vpa_is_registered(&tvcpu->arch.vpa)) + break; + + vpap = &tvcpu->arch.slb_shadow; + err = 0; + break; + + case H_VPA_DEREG_VPA: /* deregister VPA */ + /* Check they don't still have a DTL or SLB buf registered */ + err = H_RESOURCE; + if (vpa_is_registered(&tvcpu->arch.dtl) || + vpa_is_registered(&tvcpu->arch.slb_shadow)) + break; + + vpap = &tvcpu->arch.vpa; + err = 0; + break; + + case H_VPA_DEREG_DTL: /* deregister DTL */ + vpap = &tvcpu->arch.dtl; + err = 0; + break; + + case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */ + vpap = &tvcpu->arch.slb_shadow; + err = 0; + break; + } + + if (vpap) { + vpap->next_gpa = vpa; + vpap->len = len; + vpap->update_pending = 1; + } + + spin_unlock(&tvcpu->arch.vpa_update_lock); + + return err; +} + +static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap) +{ + struct kvm *kvm = vcpu->kvm; + void *va; + unsigned long nb; + unsigned long gpa; + + /* + * We need to pin the page pointed to by vpap->next_gpa, + * but we can't call kvmppc_pin_guest_page under the lock + * as it does get_user_pages() and down_read(). So we + * have to drop the lock, pin the page, then get the lock + * again and check that a new area didn't get registered + * in the meantime. + */ + for (;;) { + gpa = vpap->next_gpa; + spin_unlock(&vcpu->arch.vpa_update_lock); + va = NULL; + nb = 0; + if (gpa) + va = kvmppc_pin_guest_page(kvm, gpa, &nb); + spin_lock(&vcpu->arch.vpa_update_lock); + if (gpa == vpap->next_gpa) + break; + /* sigh... unpin that one and try again */ + if (va) + kvmppc_unpin_guest_page(kvm, va, gpa, false); + } + + vpap->update_pending = 0; + if (va && nb < vpap->len) { + /* + * If it's now too short, it must be that userspace + * has changed the mappings underlying guest memory, + * so unregister the region. + */ + kvmppc_unpin_guest_page(kvm, va, gpa, false); + va = NULL; + } + if (vpap->pinned_addr) + kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa, + vpap->dirty); + vpap->gpa = gpa; + vpap->pinned_addr = va; + vpap->dirty = false; + if (va) + vpap->pinned_end = va + vpap->len; +} + +static void kvmppc_update_vpas(struct kvm_vcpu *vcpu) +{ + if (!(vcpu->arch.vpa.update_pending || + vcpu->arch.slb_shadow.update_pending || + vcpu->arch.dtl.update_pending)) + return; + + spin_lock(&vcpu->arch.vpa_update_lock); + if (vcpu->arch.vpa.update_pending) { + kvmppc_update_vpa(vcpu, &vcpu->arch.vpa); + if (vcpu->arch.vpa.pinned_addr) + init_vpa(vcpu, vcpu->arch.vpa.pinned_addr); + } + if (vcpu->arch.dtl.update_pending) { + kvmppc_update_vpa(vcpu, &vcpu->arch.dtl); + vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr; + vcpu->arch.dtl_index = 0; + } + if (vcpu->arch.slb_shadow.update_pending) + kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow); + spin_unlock(&vcpu->arch.vpa_update_lock); +} + +/* + * Return the accumulated stolen time for the vcore up until `now'. + * The caller should hold the vcore lock. + */ +static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) +{ + u64 p; + unsigned long flags; + + spin_lock_irqsave(&vc->stoltb_lock, flags); + p = vc->stolen_tb; + if (vc->vcore_state != VCORE_INACTIVE && + vc->preempt_tb != TB_NIL) + p += now - vc->preempt_tb; + spin_unlock_irqrestore(&vc->stoltb_lock, flags); + return p; +} + +static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, + struct kvmppc_vcore *vc) +{ + struct dtl_entry *dt; + struct lppaca *vpa; + unsigned long stolen; + unsigned long core_stolen; + u64 now; + + dt = vcpu->arch.dtl_ptr; + vpa = vcpu->arch.vpa.pinned_addr; + now = mftb(); + core_stolen = vcore_stolen_time(vc, now); + stolen = core_stolen - vcpu->arch.stolen_logged; + vcpu->arch.stolen_logged = core_stolen; + spin_lock_irq(&vcpu->arch.tbacct_lock); + stolen += vcpu->arch.busy_stolen; + vcpu->arch.busy_stolen = 0; + spin_unlock_irq(&vcpu->arch.tbacct_lock); + if (!dt || !vpa) + return; + memset(dt, 0, sizeof(struct dtl_entry)); + dt->dispatch_reason = 7; + dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid); + dt->timebase = cpu_to_be64(now + vc->tb_offset); + dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); + dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); + dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); + ++dt; + if (dt == vcpu->arch.dtl.pinned_end) + dt = vcpu->arch.dtl.pinned_addr; + vcpu->arch.dtl_ptr = dt; + /* order writing *dt vs. writing vpa->dtl_idx */ + smp_wmb(); + vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index); + vcpu->arch.dtl.dirty = true; +} + +static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu) +{ + if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207) + return true; + if ((!vcpu->arch.vcore->arch_compat) && + cpu_has_feature(CPU_FTR_ARCH_207S)) + return true; + return false; +} + +static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags, + unsigned long resource, unsigned long value1, + unsigned long value2) +{ + switch (resource) { + case H_SET_MODE_RESOURCE_SET_CIABR: + if (!kvmppc_power8_compatible(vcpu)) + return H_P2; + if (value2) + return H_P4; + if (mflags) + return H_UNSUPPORTED_FLAG_START; + /* Guests can't breakpoint the hypervisor */ + if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER) + return H_P3; + vcpu->arch.ciabr = value1; + return H_SUCCESS; + case H_SET_MODE_RESOURCE_SET_DAWR: + if (!kvmppc_power8_compatible(vcpu)) + return H_P2; + if (mflags) + return H_UNSUPPORTED_FLAG_START; + if (value2 & DABRX_HYP) + return H_P4; + vcpu->arch.dawr = value1; + vcpu->arch.dawrx = value2; + return H_SUCCESS; + default: + return H_TOO_HARD; + } +} + +static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target) +{ + struct kvmppc_vcore *vcore = target->arch.vcore; + + /* + * We expect to have been called by the real mode handler + * (kvmppc_rm_h_confer()) which would have directly returned + * H_SUCCESS if the source vcore wasn't idle (e.g. if it may + * have useful work to do and should not confer) so we don't + * recheck that here. + */ + + spin_lock(&vcore->lock); + if (target->arch.state == KVMPPC_VCPU_RUNNABLE && + vcore->vcore_state != VCORE_INACTIVE) + target = vcore->runner; + spin_unlock(&vcore->lock); + + return kvm_vcpu_yield_to(target); +} + +static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) +{ + int yield_count = 0; + struct lppaca *lppaca; + + spin_lock(&vcpu->arch.vpa_update_lock); + lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr; + if (lppaca) + yield_count = be32_to_cpu(lppaca->yield_count); + spin_unlock(&vcpu->arch.vpa_update_lock); + return yield_count; +} + +int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) +{ + unsigned long req = kvmppc_get_gpr(vcpu, 3); + unsigned long target, ret = H_SUCCESS; + int yield_count; + struct kvm_vcpu *tvcpu; + int idx, rc; + + if (req <= MAX_HCALL_OPCODE && + !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls)) + return RESUME_HOST; + + switch (req) { + case H_CEDE: + break; + case H_PROD: + target = kvmppc_get_gpr(vcpu, 4); + tvcpu = kvmppc_find_vcpu(vcpu->kvm, target); + if (!tvcpu) { + ret = H_PARAMETER; + break; + } + tvcpu->arch.prodded = 1; + smp_mb(); + if (vcpu->arch.ceded) { + if (swaitqueue_active(&vcpu->wq)) { + swait_wake_interruptible(&vcpu->wq); + vcpu->stat.halt_wakeup++; + } + } + break; + case H_CONFER: + target = kvmppc_get_gpr(vcpu, 4); + if (target == -1) + break; + tvcpu = kvmppc_find_vcpu(vcpu->kvm, target); + if (!tvcpu) { + ret = H_PARAMETER; + break; + } + yield_count = kvmppc_get_gpr(vcpu, 5); + if (kvmppc_get_yield_count(tvcpu) != yield_count) + break; + kvm_arch_vcpu_yield_to(tvcpu); + break; + case H_REGISTER_VPA: + ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + break; + case H_RTAS: + if (list_empty(&vcpu->kvm->arch.rtas_tokens)) + return RESUME_HOST; + + idx = srcu_read_lock(&vcpu->kvm->srcu); + rc = kvmppc_rtas_hcall(vcpu); + srcu_read_unlock(&vcpu->kvm->srcu, idx); + + if (rc == -ENOENT) + return RESUME_HOST; + else if (rc == 0) + break; + + /* Send the error out to userspace via KVM_RUN */ + return rc; + case H_LOGICAL_CI_LOAD: + ret = kvmppc_h_logical_ci_load(vcpu); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_LOGICAL_CI_STORE: + ret = kvmppc_h_logical_ci_store(vcpu); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_SET_MODE: + ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6), + kvmppc_get_gpr(vcpu, 7)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_XIRR: + case H_CPPR: + case H_EOI: + case H_IPI: + case H_IPOLL: + case H_XIRR_X: + if (kvmppc_xics_enabled(vcpu)) { + ret = kvmppc_xics_hcall(vcpu, req); + break; + } /* fallthrough */ + default: + return RESUME_HOST; + } + kvmppc_set_gpr(vcpu, 3, ret); + vcpu->arch.hcall_needed = 0; + return RESUME_GUEST; +} + +static int kvmppc_hcall_impl_hv(unsigned long cmd) +{ + switch (cmd) { + case H_CEDE: + case H_PROD: + case H_CONFER: + case H_REGISTER_VPA: + case H_SET_MODE: + case H_LOGICAL_CI_LOAD: + case H_LOGICAL_CI_STORE: +#ifdef CONFIG_KVM_XICS + case H_XIRR: + case H_CPPR: + case H_EOI: + case H_IPI: + case H_IPOLL: + case H_XIRR_X: +#endif + return 1; + } + + /* See if it's in the real-mode table */ + return kvmppc_hcall_impl_hv_realmode(cmd); +} + +static int kvmppc_emulate_debug_inst(struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + u32 last_inst; + + if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != + EMULATE_DONE) { + /* + * Fetch failed, so return to guest and + * try executing it again. + */ + return RESUME_GUEST; + } + + if (last_inst == KVMPPC_INST_SW_BREAKPOINT) { + run->exit_reason = KVM_EXIT_DEBUG; + run->debug.arch.address = kvmppc_get_pc(vcpu); + return RESUME_HOST; + } else { + kvmppc_core_queue_program(vcpu, SRR1_PROGILL); + return RESUME_GUEST; + } +} + +static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu, + struct task_struct *tsk) +{ + int r = RESUME_HOST; + + vcpu->stat.sum_exits++; + + run->exit_reason = KVM_EXIT_UNKNOWN; + run->ready_for_interrupt_injection = 1; + switch (vcpu->arch.trap) { + /* We're good on these - the host merely wanted to get our attention */ + case BOOK3S_INTERRUPT_HV_DECREMENTER: + vcpu->stat.dec_exits++; + r = RESUME_GUEST; + break; + case BOOK3S_INTERRUPT_EXTERNAL: + case BOOK3S_INTERRUPT_H_DOORBELL: + vcpu->stat.ext_intr_exits++; + r = RESUME_GUEST; + break; + /* HMI is hypervisor interrupt and host has handled it. Resume guest.*/ + case BOOK3S_INTERRUPT_HMI: + case BOOK3S_INTERRUPT_PERFMON: + r = RESUME_GUEST; + break; + case BOOK3S_INTERRUPT_MACHINE_CHECK: + /* + * Deliver a machine check interrupt to the guest. + * We have to do this, even if the host has handled the + * machine check, because machine checks use SRR0/1 and + * the interrupt might have trashed guest state in them. + */ + kvmppc_book3s_queue_irqprio(vcpu, + BOOK3S_INTERRUPT_MACHINE_CHECK); + r = RESUME_GUEST; + break; + case BOOK3S_INTERRUPT_PROGRAM: + { + ulong flags; + /* + * Normally program interrupts are delivered directly + * to the guest by the hardware, but we can get here + * as a result of a hypervisor emulation interrupt + * (e40) getting turned into a 700 by BML RTAS. + */ + flags = vcpu->arch.shregs.msr & 0x1f0000ull; + kvmppc_core_queue_program(vcpu, flags); + r = RESUME_GUEST; + break; + } + case BOOK3S_INTERRUPT_SYSCALL: + { + /* hcall - punt to userspace */ + int i; + + /* hypercall with MSR_PR has already been handled in rmode, + * and never reaches here. + */ + + run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); + for (i = 0; i < 9; ++i) + run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); + run->exit_reason = KVM_EXIT_PAPR_HCALL; + vcpu->arch.hcall_needed = 1; + r = RESUME_HOST; + break; + } + /* + * We get these next two if the guest accesses a page which it thinks + * it has mapped but which is not actually present, either because + * it is for an emulated I/O device or because the corresonding + * host page has been paged out. Any other HDSI/HISI interrupts + * have been handled already. + */ + case BOOK3S_INTERRUPT_H_DATA_STORAGE: + r = RESUME_PAGE_FAULT; + break; + case BOOK3S_INTERRUPT_H_INST_STORAGE: + vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); + vcpu->arch.fault_dsisr = 0; + r = RESUME_PAGE_FAULT; + break; + /* + * This occurs if the guest executes an illegal instruction. + * If the guest debug is disabled, generate a program interrupt + * to the guest. If guest debug is enabled, we need to check + * whether the instruction is a software breakpoint instruction. + * Accordingly return to Guest or Host. + */ + case BOOK3S_INTERRUPT_H_EMUL_ASSIST: + if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED) + vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ? + swab32(vcpu->arch.emul_inst) : + vcpu->arch.emul_inst; + if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) { + r = kvmppc_emulate_debug_inst(run, vcpu); + } else { + kvmppc_core_queue_program(vcpu, SRR1_PROGILL); + r = RESUME_GUEST; + } + break; + /* + * This occurs if the guest (kernel or userspace), does something that + * is prohibited by HFSCR. We just generate a program interrupt to + * the guest. + */ + case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: + kvmppc_core_queue_program(vcpu, SRR1_PROGILL); + r = RESUME_GUEST; + break; + default: + kvmppc_dump_regs(vcpu); + printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", + vcpu->arch.trap, kvmppc_get_pc(vcpu), + vcpu->arch.shregs.msr); + run->hw.hardware_exit_reason = vcpu->arch.trap; + r = RESUME_HOST; + break; + } + + return r; +} + +static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + int i; + + memset(sregs, 0, sizeof(struct kvm_sregs)); + sregs->pvr = vcpu->arch.pvr; + for (i = 0; i < vcpu->arch.slb_max; i++) { + sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige; + sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; + } + + return 0; +} + +static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + int i, j; + + /* Only accept the same PVR as the host's, since we can't spoof it */ + if (sregs->pvr != vcpu->arch.pvr) + return -EINVAL; + + j = 0; + for (i = 0; i < vcpu->arch.slb_nr; i++) { + if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) { + vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe; + vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv; + ++j; + } + } + vcpu->arch.slb_max = j; + + return 0; +} + +static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, + bool preserve_top32) +{ + struct kvm *kvm = vcpu->kvm; + struct kvmppc_vcore *vc = vcpu->arch.vcore; + u64 mask; + + mutex_lock(&kvm->lock); + spin_lock(&vc->lock); + /* + * If ILE (interrupt little-endian) has changed, update the + * MSR_LE bit in the intr_msr for each vcpu in this vcore. + */ + if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) { + struct kvm_vcpu *vcpu; + int i; + + kvm_for_each_vcpu(i, vcpu, kvm) { + if (vcpu->arch.vcore != vc) + continue; + if (new_lpcr & LPCR_ILE) + vcpu->arch.intr_msr |= MSR_LE; + else + vcpu->arch.intr_msr &= ~MSR_LE; + } + } + + /* + * Userspace can only modify DPFD (default prefetch depth), + * ILE (interrupt little-endian) and TC (translation control). + * On POWER8 userspace can also modify AIL (alt. interrupt loc.) + */ + mask = LPCR_DPFD | LPCR_ILE | LPCR_TC; + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + mask |= LPCR_AIL; + + /* Broken 32-bit version of LPCR must not clear top bits */ + if (preserve_top32) + mask &= 0xFFFFFFFF; + vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask); + spin_unlock(&vc->lock); + mutex_unlock(&kvm->lock); +} + +static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, + union kvmppc_one_reg *val) +{ + int r = 0; + long int i; + + switch (id) { + case KVM_REG_PPC_DEBUG_INST: + *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT); + break; + case KVM_REG_PPC_HIOR: + *val = get_reg_val(id, 0); + break; + case KVM_REG_PPC_DABR: + *val = get_reg_val(id, vcpu->arch.dabr); + break; + case KVM_REG_PPC_DABRX: + *val = get_reg_val(id, vcpu->arch.dabrx); + break; + case KVM_REG_PPC_DSCR: + *val = get_reg_val(id, vcpu->arch.dscr); + break; + case KVM_REG_PPC_PURR: + *val = get_reg_val(id, vcpu->arch.purr); + break; + case KVM_REG_PPC_SPURR: + *val = get_reg_val(id, vcpu->arch.spurr); + break; + case KVM_REG_PPC_AMR: + *val = get_reg_val(id, vcpu->arch.amr); + break; + case KVM_REG_PPC_UAMOR: + *val = get_reg_val(id, vcpu->arch.uamor); + break; + case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS: + i = id - KVM_REG_PPC_MMCR0; + *val = get_reg_val(id, vcpu->arch.mmcr[i]); + break; + case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: + i = id - KVM_REG_PPC_PMC1; + *val = get_reg_val(id, vcpu->arch.pmc[i]); + break; + case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: + i = id - KVM_REG_PPC_SPMC1; + *val = get_reg_val(id, vcpu->arch.spmc[i]); + break; + case KVM_REG_PPC_SIAR: + *val = get_reg_val(id, vcpu->arch.siar); + break; + case KVM_REG_PPC_SDAR: + *val = get_reg_val(id, vcpu->arch.sdar); + break; + case KVM_REG_PPC_SIER: + *val = get_reg_val(id, vcpu->arch.sier); + break; + case KVM_REG_PPC_IAMR: + *val = get_reg_val(id, vcpu->arch.iamr); + break; + case KVM_REG_PPC_PSPB: + *val = get_reg_val(id, vcpu->arch.pspb); + break; + case KVM_REG_PPC_DPDES: + *val = get_reg_val(id, vcpu->arch.vcore->dpdes); + break; + case KVM_REG_PPC_DAWR: + *val = get_reg_val(id, vcpu->arch.dawr); + break; + case KVM_REG_PPC_DAWRX: + *val = get_reg_val(id, vcpu->arch.dawrx); + break; + case KVM_REG_PPC_CIABR: + *val = get_reg_val(id, vcpu->arch.ciabr); + break; + case KVM_REG_PPC_CSIGR: + *val = get_reg_val(id, vcpu->arch.csigr); + break; + case KVM_REG_PPC_TACR: + *val = get_reg_val(id, vcpu->arch.tacr); + break; + case KVM_REG_PPC_TCSCR: + *val = get_reg_val(id, vcpu->arch.tcscr); + break; + case KVM_REG_PPC_PID: + *val = get_reg_val(id, vcpu->arch.pid); + break; + case KVM_REG_PPC_ACOP: + *val = get_reg_val(id, vcpu->arch.acop); + break; + case KVM_REG_PPC_WORT: + *val = get_reg_val(id, vcpu->arch.wort); + break; + case KVM_REG_PPC_VPA_ADDR: + spin_lock(&vcpu->arch.vpa_update_lock); + *val = get_reg_val(id, vcpu->arch.vpa.next_gpa); + spin_unlock(&vcpu->arch.vpa_update_lock); + break; + case KVM_REG_PPC_VPA_SLB: + spin_lock(&vcpu->arch.vpa_update_lock); + val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa; + val->vpaval.length = vcpu->arch.slb_shadow.len; + spin_unlock(&vcpu->arch.vpa_update_lock); + break; + case KVM_REG_PPC_VPA_DTL: + spin_lock(&vcpu->arch.vpa_update_lock); + val->vpaval.addr = vcpu->arch.dtl.next_gpa; + val->vpaval.length = vcpu->arch.dtl.len; + spin_unlock(&vcpu->arch.vpa_update_lock); + break; + case KVM_REG_PPC_TB_OFFSET: + *val = get_reg_val(id, vcpu->arch.vcore->tb_offset); + break; + case KVM_REG_PPC_LPCR: + case KVM_REG_PPC_LPCR_64: + *val = get_reg_val(id, vcpu->arch.vcore->lpcr); + break; + case KVM_REG_PPC_PPR: + *val = get_reg_val(id, vcpu->arch.ppr); + break; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + case KVM_REG_PPC_TFHAR: + *val = get_reg_val(id, vcpu->arch.tfhar); + break; + case KVM_REG_PPC_TFIAR: + *val = get_reg_val(id, vcpu->arch.tfiar); + break; + case KVM_REG_PPC_TEXASR: + *val = get_reg_val(id, vcpu->arch.texasr); + break; + case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: + i = id - KVM_REG_PPC_TM_GPR0; + *val = get_reg_val(id, vcpu->arch.gpr_tm[i]); + break; + case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: + { + int j; + i = id - KVM_REG_PPC_TM_VSR0; + if (i < 32) + for (j = 0; j < TS_FPRWIDTH; j++) + val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j]; + else { + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + val->vval = vcpu->arch.vr_tm.vr[i-32]; + else + r = -ENXIO; + } + break; + } + case KVM_REG_PPC_TM_CR: + *val = get_reg_val(id, vcpu->arch.cr_tm); + break; + case KVM_REG_PPC_TM_LR: + *val = get_reg_val(id, vcpu->arch.lr_tm); + break; + case KVM_REG_PPC_TM_CTR: + *val = get_reg_val(id, vcpu->arch.ctr_tm); + break; + case KVM_REG_PPC_TM_FPSCR: + *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr); + break; + case KVM_REG_PPC_TM_AMR: + *val = get_reg_val(id, vcpu->arch.amr_tm); + break; + case KVM_REG_PPC_TM_PPR: + *val = get_reg_val(id, vcpu->arch.ppr_tm); + break; + case KVM_REG_PPC_TM_VRSAVE: + *val = get_reg_val(id, vcpu->arch.vrsave_tm); + break; + case KVM_REG_PPC_TM_VSCR: + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]); + else + r = -ENXIO; + break; + case KVM_REG_PPC_TM_DSCR: + *val = get_reg_val(id, vcpu->arch.dscr_tm); + break; + case KVM_REG_PPC_TM_TAR: + *val = get_reg_val(id, vcpu->arch.tar_tm); + break; +#endif + case KVM_REG_PPC_ARCH_COMPAT: + *val = get_reg_val(id, vcpu->arch.vcore->arch_compat); + break; + default: + r = -EINVAL; + break; + } + + return r; +} + +static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, + union kvmppc_one_reg *val) +{ + int r = 0; + long int i; + unsigned long addr, len; + + switch (id) { + case KVM_REG_PPC_HIOR: + /* Only allow this to be set to zero */ + if (set_reg_val(id, *val)) + r = -EINVAL; + break; + case KVM_REG_PPC_DABR: + vcpu->arch.dabr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DABRX: + vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP; + break; + case KVM_REG_PPC_DSCR: + vcpu->arch.dscr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_PURR: + vcpu->arch.purr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SPURR: + vcpu->arch.spurr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_AMR: + vcpu->arch.amr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_UAMOR: + vcpu->arch.uamor = set_reg_val(id, *val); + break; + case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS: + i = id - KVM_REG_PPC_MMCR0; + vcpu->arch.mmcr[i] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: + i = id - KVM_REG_PPC_PMC1; + vcpu->arch.pmc[i] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: + i = id - KVM_REG_PPC_SPMC1; + vcpu->arch.spmc[i] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SIAR: + vcpu->arch.siar = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SDAR: + vcpu->arch.sdar = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SIER: + vcpu->arch.sier = set_reg_val(id, *val); + break; + case KVM_REG_PPC_IAMR: + vcpu->arch.iamr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_PSPB: + vcpu->arch.pspb = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DPDES: + vcpu->arch.vcore->dpdes = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DAWR: + vcpu->arch.dawr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DAWRX: + vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP; + break; + case KVM_REG_PPC_CIABR: + vcpu->arch.ciabr = set_reg_val(id, *val); + /* Don't allow setting breakpoints in hypervisor code */ + if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) + vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */ + break; + case KVM_REG_PPC_CSIGR: + vcpu->arch.csigr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TACR: + vcpu->arch.tacr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TCSCR: + vcpu->arch.tcscr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_PID: + vcpu->arch.pid = set_reg_val(id, *val); + break; + case KVM_REG_PPC_ACOP: + vcpu->arch.acop = set_reg_val(id, *val); + break; + case KVM_REG_PPC_WORT: + vcpu->arch.wort = set_reg_val(id, *val); + break; + case KVM_REG_PPC_VPA_ADDR: + addr = set_reg_val(id, *val); + r = -EINVAL; + if (!addr && (vcpu->arch.slb_shadow.next_gpa || + vcpu->arch.dtl.next_gpa)) + break; + r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca)); + break; + case KVM_REG_PPC_VPA_SLB: + addr = val->vpaval.addr; + len = val->vpaval.length; + r = -EINVAL; + if (addr && !vcpu->arch.vpa.next_gpa) + break; + r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len); + break; + case KVM_REG_PPC_VPA_DTL: + addr = val->vpaval.addr; + len = val->vpaval.length; + r = -EINVAL; + if (addr && (len < sizeof(struct dtl_entry) || + !vcpu->arch.vpa.next_gpa)) + break; + len -= len % sizeof(struct dtl_entry); + r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); + break; + case KVM_REG_PPC_TB_OFFSET: + /* round up to multiple of 2^24 */ + vcpu->arch.vcore->tb_offset = + ALIGN(set_reg_val(id, *val), 1UL << 24); + break; + case KVM_REG_PPC_LPCR: + kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true); + break; + case KVM_REG_PPC_LPCR_64: + kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false); + break; + case KVM_REG_PPC_PPR: + vcpu->arch.ppr = set_reg_val(id, *val); + break; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + case KVM_REG_PPC_TFHAR: + vcpu->arch.tfhar = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TFIAR: + vcpu->arch.tfiar = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TEXASR: + vcpu->arch.texasr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: + i = id - KVM_REG_PPC_TM_GPR0; + vcpu->arch.gpr_tm[i] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: + { + int j; + i = id - KVM_REG_PPC_TM_VSR0; + if (i < 32) + for (j = 0; j < TS_FPRWIDTH; j++) + vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j]; + else + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + vcpu->arch.vr_tm.vr[i-32] = val->vval; + else + r = -ENXIO; + break; + } + case KVM_REG_PPC_TM_CR: + vcpu->arch.cr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_LR: + vcpu->arch.lr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_CTR: + vcpu->arch.ctr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_FPSCR: + vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_AMR: + vcpu->arch.amr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_PPR: + vcpu->arch.ppr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_VRSAVE: + vcpu->arch.vrsave_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_VSCR: + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val); + else + r = - ENXIO; + break; + case KVM_REG_PPC_TM_DSCR: + vcpu->arch.dscr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_TAR: + vcpu->arch.tar_tm = set_reg_val(id, *val); + break; +#endif + case KVM_REG_PPC_ARCH_COMPAT: + r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val)); + break; + default: + r = -EINVAL; + break; + } + + return r; +} + +static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core) +{ + struct kvmppc_vcore *vcore; + + vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL); + + if (vcore == NULL) + return NULL; + + INIT_LIST_HEAD(&vcore->runnable_threads); + spin_lock_init(&vcore->lock); + spin_lock_init(&vcore->stoltb_lock); + init_swait_head(&vcore->wq); + vcore->preempt_tb = TB_NIL; + vcore->lpcr = kvm->arch.lpcr; + vcore->first_vcpuid = core * threads_per_subcore; + vcore->kvm = kvm; + + vcore->mpp_buffer_is_valid = false; + + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + vcore->mpp_buffer = (void *)__get_free_pages( + GFP_KERNEL|__GFP_ZERO, + MPP_BUFFER_ORDER); + + return vcore; +} + +#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING +static struct debugfs_timings_element { + const char *name; + size_t offset; +} timings[] = { + {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)}, + {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)}, + {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)}, + {"guest", offsetof(struct kvm_vcpu, arch.guest_time)}, + {"cede", offsetof(struct kvm_vcpu, arch.cede_time)}, +}; + +#define N_TIMINGS (sizeof(timings) / sizeof(timings[0])) + +struct debugfs_timings_state { + struct kvm_vcpu *vcpu; + unsigned int buflen; + char buf[N_TIMINGS * 100]; +}; + +static int debugfs_timings_open(struct inode *inode, struct file *file) +{ + struct kvm_vcpu *vcpu = inode->i_private; + struct debugfs_timings_state *p; + + p = kzalloc(sizeof(*p), GFP_KERNEL); + if (!p) + return -ENOMEM; + + kvm_get_kvm(vcpu->kvm); + p->vcpu = vcpu; + file->private_data = p; + + return nonseekable_open(inode, file); +} + +static int debugfs_timings_release(struct inode *inode, struct file *file) +{ + struct debugfs_timings_state *p = file->private_data; + + kvm_put_kvm(p->vcpu->kvm); + kfree(p); + return 0; +} + +static ssize_t debugfs_timings_read(struct file *file, char __user *buf, + size_t len, loff_t *ppos) +{ + struct debugfs_timings_state *p = file->private_data; + struct kvm_vcpu *vcpu = p->vcpu; + char *s, *buf_end; + struct kvmhv_tb_accumulator tb; + u64 count; + loff_t pos; + ssize_t n; + int i, loops; + bool ok; + + if (!p->buflen) { + s = p->buf; + buf_end = s + sizeof(p->buf); + for (i = 0; i < N_TIMINGS; ++i) { + struct kvmhv_tb_accumulator *acc; + + acc = (struct kvmhv_tb_accumulator *) + ((unsigned long)vcpu + timings[i].offset); + ok = false; + for (loops = 0; loops < 1000; ++loops) { + count = acc->seqcount; + if (!(count & 1)) { + smp_rmb(); + tb = *acc; + smp_rmb(); + if (count == acc->seqcount) { + ok = true; + break; + } + } + udelay(1); + } + if (!ok) + snprintf(s, buf_end - s, "%s: stuck\n", + timings[i].name); + else + snprintf(s, buf_end - s, + "%s: %llu %llu %llu %llu\n", + timings[i].name, count / 2, + tb_to_ns(tb.tb_total), + tb_to_ns(tb.tb_min), + tb_to_ns(tb.tb_max)); + s += strlen(s); + } + p->buflen = s - p->buf; + } + + pos = *ppos; + if (pos >= p->buflen) + return 0; + if (len > p->buflen - pos) + len = p->buflen - pos; + n = copy_to_user(buf, p->buf + pos, len); + if (n) { + if (n == len) + return -EFAULT; + len -= n; + } + *ppos = pos + len; + return len; +} + +static ssize_t debugfs_timings_write(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + return -EACCES; +} + +static const struct file_operations debugfs_timings_ops = { + .owner = THIS_MODULE, + .open = debugfs_timings_open, + .release = debugfs_timings_release, + .read = debugfs_timings_read, + .write = debugfs_timings_write, + .llseek = generic_file_llseek, +}; + +/* Create a debugfs directory for the vcpu */ +static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) +{ + char buf[16]; + struct kvm *kvm = vcpu->kvm; + + snprintf(buf, sizeof(buf), "vcpu%u", id); + if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir)) + return; + vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir); + if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir)) + return; + vcpu->arch.debugfs_timings = + debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir, + vcpu, &debugfs_timings_ops); +} + +#else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ +static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) +{ +} +#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ + +static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm, + unsigned int id) +{ + struct kvm_vcpu *vcpu; + int err = -EINVAL; + int core; + struct kvmppc_vcore *vcore; + + core = id / threads_per_subcore; + if (core >= KVM_MAX_VCORES) + goto out; + + err = -ENOMEM; + vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); + if (!vcpu) + goto out; + + err = kvm_vcpu_init(vcpu, kvm, id); + if (err) + goto free_vcpu; + + vcpu->arch.shared = &vcpu->arch.shregs; +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + /* + * The shared struct is never shared on HV, + * so we can always use host endianness + */ +#ifdef __BIG_ENDIAN__ + vcpu->arch.shared_big_endian = true; +#else + vcpu->arch.shared_big_endian = false; +#endif +#endif + vcpu->arch.mmcr[0] = MMCR0_FC; + vcpu->arch.ctrl = CTRL_RUNLATCH; + /* default to host PVR, since we can't spoof it */ + kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR)); + spin_lock_init(&vcpu->arch.vpa_update_lock); + spin_lock_init(&vcpu->arch.tbacct_lock); + vcpu->arch.busy_preempt = TB_NIL; + vcpu->arch.intr_msr = MSR_SF | MSR_ME; + + kvmppc_mmu_book3s_hv_init(vcpu); + + vcpu->arch.state = KVMPPC_VCPU_NOTREADY; + + init_waitqueue_head(&vcpu->arch.cpu_run); + + mutex_lock(&kvm->lock); + vcore = kvm->arch.vcores[core]; + if (!vcore) { + vcore = kvmppc_vcore_create(kvm, core); + kvm->arch.vcores[core] = vcore; + kvm->arch.online_vcores++; + } + mutex_unlock(&kvm->lock); + + if (!vcore) + goto free_vcpu; + + spin_lock(&vcore->lock); + ++vcore->num_threads; + spin_unlock(&vcore->lock); + vcpu->arch.vcore = vcore; + vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid; + + vcpu->arch.cpu_type = KVM_CPU_3S_64; + kvmppc_sanity_check(vcpu); + + debugfs_vcpu_init(vcpu, id); + + return vcpu; + +free_vcpu: + kmem_cache_free(kvm_vcpu_cache, vcpu); +out: + return ERR_PTR(err); +} + +static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa) +{ + if (vpa->pinned_addr) + kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa, + vpa->dirty); +} + +static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu) +{ + spin_lock(&vcpu->arch.vpa_update_lock); + unpin_vpa(vcpu->kvm, &vcpu->arch.dtl); + unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow); + unpin_vpa(vcpu->kvm, &vcpu->arch.vpa); + spin_unlock(&vcpu->arch.vpa_update_lock); + kvm_vcpu_uninit(vcpu); + kmem_cache_free(kvm_vcpu_cache, vcpu); +} + +static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu) +{ + /* Indicate we want to get back into the guest */ + return 1; +} + +static void kvmppc_set_timer(struct kvm_vcpu *vcpu) +{ + unsigned long dec_nsec, now; + + now = get_tb(); + if (now > vcpu->arch.dec_expires) { + /* decrementer has already gone negative */ + kvmppc_core_queue_dec(vcpu); + kvmppc_core_prepare_to_enter(vcpu); + return; + } + dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC + / tb_ticks_per_sec; + hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec), + HRTIMER_MODE_REL); + vcpu->arch.timer_running = 1; +} + +static void kvmppc_end_cede(struct kvm_vcpu *vcpu) +{ + vcpu->arch.ceded = 0; + if (vcpu->arch.timer_running) { + hrtimer_try_to_cancel(&vcpu->arch.dec_timer); + vcpu->arch.timer_running = 0; + } +} + +extern void __kvmppc_vcore_entry(void); + +static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, + struct kvm_vcpu *vcpu) +{ + u64 now; + + if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) + return; + spin_lock_irq(&vcpu->arch.tbacct_lock); + now = mftb(); + vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) - + vcpu->arch.stolen_logged; + vcpu->arch.busy_preempt = now; + vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; + spin_unlock_irq(&vcpu->arch.tbacct_lock); + --vc->n_runnable; + list_del(&vcpu->arch.run_list); +} + +static int kvmppc_grab_hwthread(int cpu) +{ + struct paca_struct *tpaca; + long timeout = 10000; + + tpaca = &paca[cpu]; + + /* Ensure the thread won't go into the kernel if it wakes */ + tpaca->kvm_hstate.kvm_vcpu = NULL; + tpaca->kvm_hstate.napping = 0; + smp_wmb(); + tpaca->kvm_hstate.hwthread_req = 1; + + /* + * If the thread is already executing in the kernel (e.g. handling + * a stray interrupt), wait for it to get back to nap mode. + * The smp_mb() is to ensure that our setting of hwthread_req + * is visible before we look at hwthread_state, so if this + * races with the code at system_reset_pSeries and the thread + * misses our setting of hwthread_req, we are sure to see its + * setting of hwthread_state, and vice versa. + */ + smp_mb(); + while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) { + if (--timeout <= 0) { + pr_err("KVM: couldn't grab cpu %d\n", cpu); + return -EBUSY; + } + udelay(1); + } + return 0; +} + +static void kvmppc_release_hwthread(int cpu) +{ + struct paca_struct *tpaca; + + tpaca = &paca[cpu]; + tpaca->kvm_hstate.hwthread_req = 0; + tpaca->kvm_hstate.kvm_vcpu = NULL; +} + +static void kvmppc_start_thread(struct kvm_vcpu *vcpu) +{ + int cpu; + struct paca_struct *tpaca; + struct kvmppc_vcore *vc = vcpu->arch.vcore; + + if (vcpu->arch.timer_running) { + hrtimer_try_to_cancel(&vcpu->arch.dec_timer); + vcpu->arch.timer_running = 0; + } + cpu = vc->pcpu + vcpu->arch.ptid; + tpaca = &paca[cpu]; + tpaca->kvm_hstate.kvm_vcore = vc; + tpaca->kvm_hstate.ptid = vcpu->arch.ptid; + vcpu->cpu = vc->pcpu; + /* Order stores to hstate.kvm_vcore etc. before store to kvm_vcpu */ + smp_wmb(); + tpaca->kvm_hstate.kvm_vcpu = vcpu; + if (cpu != smp_processor_id()) + kvmppc_ipi_thread(cpu); +} + +static void kvmppc_wait_for_nap(void) +{ + int cpu = smp_processor_id(); + int i, loops; + + for (loops = 0; loops < 1000000; ++loops) { + /* + * Check if all threads are finished. + * We set the vcpu pointer when starting a thread + * and the thread clears it when finished, so we look + * for any threads that still have a non-NULL vcpu ptr. + */ + for (i = 1; i < threads_per_subcore; ++i) + if (paca[cpu + i].kvm_hstate.kvm_vcpu) + break; + if (i == threads_per_subcore) { + HMT_medium(); + return; + } + HMT_low(); + } + HMT_medium(); + for (i = 1; i < threads_per_subcore; ++i) + if (paca[cpu + i].kvm_hstate.kvm_vcpu) + pr_err("KVM: CPU %d seems to be stuck\n", cpu + i); +} + +/* + * Check that we are on thread 0 and that any other threads in + * this core are off-line. Then grab the threads so they can't + * enter the kernel. + */ +static int on_primary_thread(void) +{ + int cpu = smp_processor_id(); + int thr; + + /* Are we on a primary subcore? */ + if (cpu_thread_in_subcore(cpu)) + return 0; + + thr = 0; + while (++thr < threads_per_subcore) + if (cpu_online(cpu + thr)) + return 0; + + /* Grab all hw threads so they can't go into the kernel */ + for (thr = 1; thr < threads_per_subcore; ++thr) { + if (kvmppc_grab_hwthread(cpu + thr)) { + /* Couldn't grab one; let the others go */ + do { + kvmppc_release_hwthread(cpu + thr); + } while (--thr > 0); + return 0; + } + } + return 1; +} + +static void kvmppc_start_saving_l2_cache(struct kvmppc_vcore *vc) +{ + phys_addr_t phy_addr, mpp_addr; + + phy_addr = (phys_addr_t)virt_to_phys(vc->mpp_buffer); + mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK; + + mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_ABORT); + logmpp(mpp_addr | PPC_LOGMPP_LOG_L2); + + vc->mpp_buffer_is_valid = true; +} + +static void kvmppc_start_restoring_l2_cache(const struct kvmppc_vcore *vc) +{ + phys_addr_t phy_addr, mpp_addr; + + phy_addr = virt_to_phys(vc->mpp_buffer); + mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK; + + /* We must abort any in-progress save operations to ensure + * the table is valid so that prefetch engine knows when to + * stop prefetching. */ + logmpp(mpp_addr | PPC_LOGMPP_LOG_ABORT); + mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_WHOLE_TABLE); +} + +static void prepare_threads(struct kvmppc_vcore *vc) +{ + struct kvm_vcpu *vcpu, *vnext; + + list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads, + arch.run_list) { + if (signal_pending(vcpu->arch.run_task)) + vcpu->arch.ret = -EINTR; + else if (vcpu->arch.vpa.update_pending || + vcpu->arch.slb_shadow.update_pending || + vcpu->arch.dtl.update_pending) + vcpu->arch.ret = RESUME_GUEST; + else + continue; + kvmppc_remove_runnable(vc, vcpu); + wake_up(&vcpu->arch.cpu_run); + } +} + +static void post_guest_process(struct kvmppc_vcore *vc) +{ + u64 now; + long ret; + struct kvm_vcpu *vcpu, *vnext; + + now = get_tb(); + list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads, + arch.run_list) { + /* cancel pending dec exception if dec is positive */ + if (now < vcpu->arch.dec_expires && + kvmppc_core_pending_dec(vcpu)) + kvmppc_core_dequeue_dec(vcpu); + + trace_kvm_guest_exit(vcpu); + + ret = RESUME_GUEST; + if (vcpu->arch.trap) + ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu, + vcpu->arch.run_task); + + vcpu->arch.ret = ret; + vcpu->arch.trap = 0; + + if (vcpu->arch.ceded) { + if (!is_kvmppc_resume_guest(ret)) + kvmppc_end_cede(vcpu); + else + kvmppc_set_timer(vcpu); + } + if (!is_kvmppc_resume_guest(vcpu->arch.ret)) { + kvmppc_remove_runnable(vc, vcpu); + wake_up(&vcpu->arch.cpu_run); + } + } +} + +/* + * Run a set of guest threads on a physical core. + * Called with vc->lock held. + */ +static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) +{ + struct kvm_vcpu *vcpu, *vnext; + int i; + int srcu_idx; + + /* + * Remove from the list any threads that have a signal pending + * or need a VPA update done + */ + prepare_threads(vc); + + /* if the runner is no longer runnable, let the caller pick a new one */ + if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE) + return; + + /* + * Initialize *vc. + */ + vc->entry_exit_map = 0; + vc->preempt_tb = TB_NIL; + vc->in_guest = 0; + vc->napping_threads = 0; + vc->conferring_threads = 0; + + /* + * Make sure we are running on primary threads, and that secondary + * threads are offline. Also check if the number of threads in this + * guest are greater than the current system threads per guest. + */ + if ((threads_per_core > 1) && + ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) { + list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads, + arch.run_list) { + vcpu->arch.ret = -EBUSY; + kvmppc_remove_runnable(vc, vcpu); + wake_up(&vcpu->arch.cpu_run); + } + goto out; + } + + + vc->pcpu = smp_processor_id(); + list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) { + kvmppc_start_thread(vcpu); + kvmppc_create_dtl_entry(vcpu, vc); + trace_kvm_guest_enter(vcpu); + } + + /* Set this explicitly in case thread 0 doesn't have a vcpu */ + get_paca()->kvm_hstate.kvm_vcore = vc; + get_paca()->kvm_hstate.ptid = 0; + + vc->vcore_state = VCORE_RUNNING; + preempt_disable(); + + trace_kvmppc_run_core(vc, 0); + + spin_unlock(&vc->lock); + + kvm_guest_enter(); + + srcu_idx = srcu_read_lock(&vc->kvm->srcu); + + if (vc->mpp_buffer_is_valid) + kvmppc_start_restoring_l2_cache(vc); + + __kvmppc_vcore_entry(); + + spin_lock(&vc->lock); + + if (vc->mpp_buffer) + kvmppc_start_saving_l2_cache(vc); + + /* disable sending of IPIs on virtual external irqs */ + list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) + vcpu->cpu = -1; + /* wait for secondary threads to finish writing their state to memory */ + kvmppc_wait_for_nap(); + for (i = 0; i < threads_per_subcore; ++i) + kvmppc_release_hwthread(vc->pcpu + i); + /* prevent other vcpu threads from doing kvmppc_start_thread() now */ + vc->vcore_state = VCORE_EXITING; + spin_unlock(&vc->lock); + + srcu_read_unlock(&vc->kvm->srcu, srcu_idx); + + /* make sure updates to secondary vcpu structs are visible now */ + smp_mb(); + kvm_guest_exit(); + + preempt_enable(); + + spin_lock(&vc->lock); + post_guest_process(vc); + + out: + vc->vcore_state = VCORE_INACTIVE; + trace_kvmppc_run_core(vc, 1); +} + +/* + * Wait for some other vcpu thread to execute us, and + * wake us up when we need to handle something in the host. + */ +static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state) +{ + DEFINE_WAIT(wait); + + prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); + if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) + schedule(); + finish_wait(&vcpu->arch.cpu_run, &wait); +} + +/* + * All the vcpus in this vcore are idle, so wait for a decrementer + * or external interrupt to one of the vcpus. vc->lock is held. + */ +static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) +{ + struct kvm_vcpu *vcpu; + int do_sleep = 1; + DEFINE_SWAITER(wait); + + swait_prepare(&vc->wq, &wait, TASK_INTERRUPTIBLE); + + /* + * Check one last time for pending exceptions and ceded state after + * we put ourselves on the wait queue + */ + list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) { + if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded) { + do_sleep = 0; + break; + } + } + + if (!do_sleep) { + swait_finish(&vc->wq, &wait); + return; + } + + vc->vcore_state = VCORE_SLEEPING; + trace_kvmppc_vcore_blocked(vc, 0); + spin_unlock(&vc->lock); + schedule(); + swait_finish(&vc->wq, &wait); + spin_lock(&vc->lock); + vc->vcore_state = VCORE_INACTIVE; + trace_kvmppc_vcore_blocked(vc, 1); +} + +static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) +{ + int n_ceded; + struct kvmppc_vcore *vc; + struct kvm_vcpu *v, *vn; + + trace_kvmppc_run_vcpu_enter(vcpu); + + kvm_run->exit_reason = 0; + vcpu->arch.ret = RESUME_GUEST; + vcpu->arch.trap = 0; + kvmppc_update_vpas(vcpu); + + /* + * Synchronize with other threads in this virtual core + */ + vc = vcpu->arch.vcore; + spin_lock(&vc->lock); + vcpu->arch.ceded = 0; + vcpu->arch.run_task = current; + vcpu->arch.kvm_run = kvm_run; + vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb()); + vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; + vcpu->arch.busy_preempt = TB_NIL; + list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads); + ++vc->n_runnable; + + /* + * This happens the first time this is called for a vcpu. + * If the vcore is already running, we may be able to start + * this thread straight away and have it join in. + */ + if (!signal_pending(current)) { + if (vc->vcore_state == VCORE_RUNNING && !VCORE_IS_EXITING(vc)) { + kvmppc_create_dtl_entry(vcpu, vc); + kvmppc_start_thread(vcpu); + trace_kvm_guest_enter(vcpu); + } else if (vc->vcore_state == VCORE_SLEEPING) { + swait_wake(&vc->wq); + } + + } + + while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && + !signal_pending(current)) { + if (vc->vcore_state != VCORE_INACTIVE) { + spin_unlock(&vc->lock); + kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE); + spin_lock(&vc->lock); + continue; + } + list_for_each_entry_safe(v, vn, &vc->runnable_threads, + arch.run_list) { + kvmppc_core_prepare_to_enter(v); + if (signal_pending(v->arch.run_task)) { + kvmppc_remove_runnable(vc, v); + v->stat.signal_exits++; + v->arch.kvm_run->exit_reason = KVM_EXIT_INTR; + v->arch.ret = -EINTR; + wake_up(&v->arch.cpu_run); + } + } + if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) + break; + n_ceded = 0; + list_for_each_entry(v, &vc->runnable_threads, arch.run_list) { + if (!v->arch.pending_exceptions) + n_ceded += v->arch.ceded; + else + v->arch.ceded = 0; + } + vc->runner = vcpu; + if (n_ceded == vc->n_runnable) { + kvmppc_vcore_blocked(vc); + } else if (should_resched()) { + vc->vcore_state = VCORE_PREEMPT; + /* Let something else run */ + cond_resched_lock(&vc->lock); + vc->vcore_state = VCORE_INACTIVE; + } else { + kvmppc_run_core(vc); + } + vc->runner = NULL; + } + + while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && + (vc->vcore_state == VCORE_RUNNING || + vc->vcore_state == VCORE_EXITING)) { + spin_unlock(&vc->lock); + kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE); + spin_lock(&vc->lock); + } + + if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { + kvmppc_remove_runnable(vc, vcpu); + vcpu->stat.signal_exits++; + kvm_run->exit_reason = KVM_EXIT_INTR; + vcpu->arch.ret = -EINTR; + } + + if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) { + /* Wake up some vcpu to run the core */ + v = list_first_entry(&vc->runnable_threads, + struct kvm_vcpu, arch.run_list); + wake_up(&v->arch.cpu_run); + } + + trace_kvmppc_run_vcpu_exit(vcpu, kvm_run); + spin_unlock(&vc->lock); + return vcpu->arch.ret; +} + +static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + int r; + int srcu_idx; + + if (!vcpu->arch.sane) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return -EINVAL; + } + + kvmppc_core_prepare_to_enter(vcpu); + + /* No need to go into the guest when all we'll do is come back out */ + if (signal_pending(current)) { + run->exit_reason = KVM_EXIT_INTR; + return -EINTR; + } + + atomic_inc(&vcpu->kvm->arch.vcpus_running); + /* Order vcpus_running vs. hpte_setup_done, see kvmppc_alloc_reset_hpt */ + smp_mb(); + + /* On the first time here, set up HTAB and VRMA */ + if (!vcpu->kvm->arch.hpte_setup_done) { + r = kvmppc_hv_setup_htab_rma(vcpu); + if (r) + goto out; + } + + flush_fp_to_thread(current); + flush_altivec_to_thread(current); + flush_vsx_to_thread(current); + vcpu->arch.wqp = &vcpu->arch.vcore->wq; + vcpu->arch.pgdir = current->mm->pgd; + vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; + + do { + r = kvmppc_run_vcpu(run, vcpu); + + if (run->exit_reason == KVM_EXIT_PAPR_HCALL && + !(vcpu->arch.shregs.msr & MSR_PR)) { + trace_kvm_hcall_enter(vcpu); + r = kvmppc_pseries_do_hcall(vcpu); + trace_kvm_hcall_exit(vcpu, r); + kvmppc_core_prepare_to_enter(vcpu); + } else if (r == RESUME_PAGE_FAULT) { + srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + r = kvmppc_book3s_hv_page_fault(run, vcpu, + vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); + srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); + } + } while (is_kvmppc_resume_guest(r)); + + out: + vcpu->arch.state = KVMPPC_VCPU_NOTREADY; + atomic_dec(&vcpu->kvm->arch.vcpus_running); + return r; +} + +static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps, + int linux_psize) +{ + struct mmu_psize_def *def = &mmu_psize_defs[linux_psize]; + + if (!def->shift) + return; + (*sps)->page_shift = def->shift; + (*sps)->slb_enc = def->sllp; + (*sps)->enc[0].page_shift = def->shift; + (*sps)->enc[0].pte_enc = def->penc[linux_psize]; + /* + * Add 16MB MPSS support if host supports it + */ + if (linux_psize != MMU_PAGE_16M && def->penc[MMU_PAGE_16M] != -1) { + (*sps)->enc[1].page_shift = 24; + (*sps)->enc[1].pte_enc = def->penc[MMU_PAGE_16M]; + } + (*sps)++; +} + +static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm, + struct kvm_ppc_smmu_info *info) +{ + struct kvm_ppc_one_seg_page_size *sps; + + info->flags = KVM_PPC_PAGE_SIZES_REAL; + if (mmu_has_feature(MMU_FTR_1T_SEGMENT)) + info->flags |= KVM_PPC_1T_SEGMENTS; + info->slb_size = mmu_slb_size; + + /* We only support these sizes for now, and no muti-size segments */ + sps = &info->sps[0]; + kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K); + kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K); + kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M); + + return 0; +} + +/* + * Get (and clear) the dirty memory log for a memory slot. + */ +static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm, + struct kvm_dirty_log *log) +{ + struct kvm_memory_slot *memslot; + int r; + unsigned long n; + + mutex_lock(&kvm->slots_lock); + + r = -EINVAL; + if (log->slot >= KVM_USER_MEM_SLOTS) + goto out; + + memslot = id_to_memslot(kvm->memslots, log->slot); + r = -ENOENT; + if (!memslot->dirty_bitmap) + goto out; + + n = kvm_dirty_bitmap_bytes(memslot); + memset(memslot->dirty_bitmap, 0, n); + + r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap); + if (r) + goto out; + + r = -EFAULT; + if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) + goto out; + + r = 0; +out: + mutex_unlock(&kvm->slots_lock); + return r; +} + +static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free, + struct kvm_memory_slot *dont) +{ + if (!dont || free->arch.rmap != dont->arch.rmap) { + vfree(free->arch.rmap); + free->arch.rmap = NULL; + } +} + +static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot, + unsigned long npages) +{ + slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap)); + if (!slot->arch.rmap) + return -ENOMEM; + + return 0; +} + +static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, + struct kvm_memory_slot *memslot, + struct kvm_userspace_memory_region *mem) +{ + return 0; +} + +static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm, + struct kvm_userspace_memory_region *mem, + const struct kvm_memory_slot *old) +{ + unsigned long npages = mem->memory_size >> PAGE_SHIFT; + struct kvm_memory_slot *memslot; + + if (npages && old->npages) { + /* + * If modifying a memslot, reset all the rmap dirty bits. + * If this is a new memslot, we don't need to do anything + * since the rmap array starts out as all zeroes, + * i.e. no pages are dirty. + */ + memslot = id_to_memslot(kvm->memslots, mem->slot); + kvmppc_hv_get_dirty_log(kvm, memslot, NULL); + } +} + +/* + * Update LPCR values in kvm->arch and in vcores. + * Caller must hold kvm->lock. + */ +void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask) +{ + long int i; + u32 cores_done = 0; + + if ((kvm->arch.lpcr & mask) == lpcr) + return; + + kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr; + + for (i = 0; i < KVM_MAX_VCORES; ++i) { + struct kvmppc_vcore *vc = kvm->arch.vcores[i]; + if (!vc) + continue; + spin_lock(&vc->lock); + vc->lpcr = (vc->lpcr & ~mask) | lpcr; + spin_unlock(&vc->lock); + if (++cores_done >= kvm->arch.online_vcores) + break; + } +} + +static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu) +{ + return; +} + +static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) +{ + int err = 0; + struct kvm *kvm = vcpu->kvm; + unsigned long hva; + struct kvm_memory_slot *memslot; + struct vm_area_struct *vma; + unsigned long lpcr = 0, senc; + unsigned long psize, porder; + int srcu_idx; + + mutex_lock(&kvm->lock); + if (kvm->arch.hpte_setup_done) + goto out; /* another vcpu beat us to it */ + + /* Allocate hashed page table (if not done already) and reset it */ + if (!kvm->arch.hpt_virt) { + err = kvmppc_alloc_hpt(kvm, NULL); + if (err) { + pr_err("KVM: Couldn't alloc HPT\n"); + goto out; + } + } + + /* Look up the memslot for guest physical address 0 */ + srcu_idx = srcu_read_lock(&kvm->srcu); + memslot = gfn_to_memslot(kvm, 0); + + /* We must have some memory at 0 by now */ + err = -EINVAL; + if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) + goto out_srcu; + + /* Look up the VMA for the start of this memory slot */ + hva = memslot->userspace_addr; + down_read(¤t->mm->mmap_sem); + vma = find_vma(current->mm, hva); + if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO)) + goto up_out; + + psize = vma_kernel_pagesize(vma); + porder = __ilog2(psize); + + up_read(¤t->mm->mmap_sem); + + /* We can handle 4k, 64k or 16M pages in the VRMA */ + err = -EINVAL; + if (!(psize == 0x1000 || psize == 0x10000 || + psize == 0x1000000)) + goto out_srcu; + + /* Update VRMASD field in the LPCR */ + senc = slb_pgsize_encoding(psize); + kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | + (VRMA_VSID << SLB_VSID_SHIFT_1T); + /* the -4 is to account for senc values starting at 0x10 */ + lpcr = senc << (LPCR_VRMASD_SH - 4); + + /* Create HPTEs in the hash page table for the VRMA */ + kvmppc_map_vrma(vcpu, memslot, porder); + + kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); + + /* Order updates to kvm->arch.lpcr etc. vs. hpte_setup_done */ + smp_wmb(); + kvm->arch.hpte_setup_done = 1; + err = 0; + out_srcu: + srcu_read_unlock(&kvm->srcu, srcu_idx); + out: + mutex_unlock(&kvm->lock); + return err; + + up_out: + up_read(¤t->mm->mmap_sem); + goto out_srcu; +} + +static int kvmppc_core_init_vm_hv(struct kvm *kvm) +{ + unsigned long lpcr, lpid; + char buf[32]; + + /* Allocate the guest's logical partition ID */ + + lpid = kvmppc_alloc_lpid(); + if ((long)lpid < 0) + return -ENOMEM; + kvm->arch.lpid = lpid; + + /* + * Since we don't flush the TLB when tearing down a VM, + * and this lpid might have previously been used, + * make sure we flush on each core before running the new VM. + */ + cpumask_setall(&kvm->arch.need_tlb_flush); + + /* Start out with the default set of hcalls enabled */ + memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls, + sizeof(kvm->arch.enabled_hcalls)); + + kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); + + /* Init LPCR for virtual RMA mode */ + kvm->arch.host_lpid = mfspr(SPRN_LPID); + kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); + lpcr &= LPCR_PECE | LPCR_LPES; + lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | + LPCR_VPM0 | LPCR_VPM1; + kvm->arch.vrma_slb_v = SLB_VSID_B_1T | + (VRMA_VSID << SLB_VSID_SHIFT_1T); + /* On POWER8 turn on online bit to enable PURR/SPURR */ + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + lpcr |= LPCR_ONL; + kvm->arch.lpcr = lpcr; + + /* + * Track that we now have a HV mode VM active. This blocks secondary + * CPU threads from coming online. + */ + kvm_hv_vm_activated(); + + /* + * Create a debugfs directory for the VM + */ + snprintf(buf, sizeof(buf), "vm%d", current->pid); + kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir); + if (!IS_ERR_OR_NULL(kvm->arch.debugfs_dir)) + kvmppc_mmu_debugfs_init(kvm); + + return 0; +} + +static void kvmppc_free_vcores(struct kvm *kvm) +{ + long int i; + + for (i = 0; i < KVM_MAX_VCORES; ++i) { + if (kvm->arch.vcores[i] && kvm->arch.vcores[i]->mpp_buffer) { + struct kvmppc_vcore *vc = kvm->arch.vcores[i]; + free_pages((unsigned long)vc->mpp_buffer, + MPP_BUFFER_ORDER); + } + kfree(kvm->arch.vcores[i]); + } + kvm->arch.online_vcores = 0; +} + +static void kvmppc_core_destroy_vm_hv(struct kvm *kvm) +{ + debugfs_remove_recursive(kvm->arch.debugfs_dir); + + kvm_hv_vm_deactivated(); + + kvmppc_free_vcores(kvm); + + kvmppc_free_hpt(kvm); +} + +/* We don't need to emulate any privileged instructions or dcbz */ +static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu, + unsigned int inst, int *advance) +{ + return EMULATE_FAIL; +} + +static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn, + ulong spr_val) +{ + return EMULATE_FAIL; +} + +static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn, + ulong *spr_val) +{ + return EMULATE_FAIL; +} + +static int kvmppc_core_check_processor_compat_hv(void) +{ + if (!cpu_has_feature(CPU_FTR_HVMODE) || + !cpu_has_feature(CPU_FTR_ARCH_206)) + return -EIO; + return 0; +} + +static long kvm_arch_vm_ioctl_hv(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm *kvm __maybe_unused = filp->private_data; + void __user *argp = (void __user *)arg; + long r; + + switch (ioctl) { + + case KVM_PPC_ALLOCATE_HTAB: { + u32 htab_order; + + r = -EFAULT; + if (get_user(htab_order, (u32 __user *)argp)) + break; + r = kvmppc_alloc_reset_hpt(kvm, &htab_order); + if (r) + break; + r = -EFAULT; + if (put_user(htab_order, (u32 __user *)argp)) + break; + r = 0; + break; + } + + case KVM_PPC_GET_HTAB_FD: { + struct kvm_get_htab_fd ghf; + + r = -EFAULT; + if (copy_from_user(&ghf, argp, sizeof(ghf))) + break; + r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf); + break; + } + + default: + r = -ENOTTY; + } + + return r; +} + +/* + * List of hcall numbers to enable by default. + * For compatibility with old userspace, we enable by default + * all hcalls that were implemented before the hcall-enabling + * facility was added. Note this list should not include H_RTAS. + */ +static unsigned int default_hcall_list[] = { + H_REMOVE, + H_ENTER, + H_READ, + H_PROTECT, + H_BULK_REMOVE, + H_GET_TCE, + H_PUT_TCE, + H_SET_DABR, + H_SET_XDABR, + H_CEDE, + H_PROD, + H_CONFER, + H_REGISTER_VPA, +#ifdef CONFIG_KVM_XICS + H_EOI, + H_CPPR, + H_IPI, + H_IPOLL, + H_XIRR, + H_XIRR_X, +#endif + 0 +}; + +static void init_default_hcalls(void) +{ + int i; + unsigned int hcall; + + for (i = 0; default_hcall_list[i]; ++i) { + hcall = default_hcall_list[i]; + WARN_ON(!kvmppc_hcall_impl_hv(hcall)); + __set_bit(hcall / 4, default_enabled_hcalls); + } +} + +static struct kvmppc_ops kvm_ops_hv = { + .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv, + .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv, + .get_one_reg = kvmppc_get_one_reg_hv, + .set_one_reg = kvmppc_set_one_reg_hv, + .vcpu_load = kvmppc_core_vcpu_load_hv, + .vcpu_put = kvmppc_core_vcpu_put_hv, + .set_msr = kvmppc_set_msr_hv, + .vcpu_run = kvmppc_vcpu_run_hv, + .vcpu_create = kvmppc_core_vcpu_create_hv, + .vcpu_free = kvmppc_core_vcpu_free_hv, + .check_requests = kvmppc_core_check_requests_hv, + .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv, + .flush_memslot = kvmppc_core_flush_memslot_hv, + .prepare_memory_region = kvmppc_core_prepare_memory_region_hv, + .commit_memory_region = kvmppc_core_commit_memory_region_hv, + .unmap_hva = kvm_unmap_hva_hv, + .unmap_hva_range = kvm_unmap_hva_range_hv, + .age_hva = kvm_age_hva_hv, + .test_age_hva = kvm_test_age_hva_hv, + .set_spte_hva = kvm_set_spte_hva_hv, + .mmu_destroy = kvmppc_mmu_destroy_hv, + .free_memslot = kvmppc_core_free_memslot_hv, + .create_memslot = kvmppc_core_create_memslot_hv, + .init_vm = kvmppc_core_init_vm_hv, + .destroy_vm = kvmppc_core_destroy_vm_hv, + .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv, + .emulate_op = kvmppc_core_emulate_op_hv, + .emulate_mtspr = kvmppc_core_emulate_mtspr_hv, + .emulate_mfspr = kvmppc_core_emulate_mfspr_hv, + .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv, + .arch_vm_ioctl = kvm_arch_vm_ioctl_hv, + .hcall_implemented = kvmppc_hcall_impl_hv, +}; + +static int kvmppc_book3s_init_hv(void) +{ + int r; + /* + * FIXME!! Do we need to check on all cpus ? + */ + r = kvmppc_core_check_processor_compat_hv(); + if (r < 0) + return -ENODEV; + + kvm_ops_hv.owner = THIS_MODULE; + kvmppc_hv_ops = &kvm_ops_hv; + + init_default_hcalls(); + + r = kvmppc_mmu_hv_init(); + return r; +} + +static void kvmppc_book3s_exit_hv(void) +{ + kvmppc_hv_ops = NULL; +} + +module_init(kvmppc_book3s_init_hv); +module_exit(kvmppc_book3s_exit_hv); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_MISCDEV(KVM_MINOR); +MODULE_ALIAS("devname:kvm"); |