2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * KVM/MIPS: MIPS specific KVM APIs
8 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
9 * Authors: Sanjay Lal <sanjayl@kymasys.com>
12 #include <linux/errno.h>
13 #include <linux/err.h>
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
17 #include <linux/bootmem.h>
19 #include <asm/cacheflush.h>
20 #include <asm/mmu_context.h>
22 #include <linux/kvm_host.h>
24 #include "kvm_mips_int.h"
25 #include "kvm_mips_comm.h"
27 #define CREATE_TRACE_POINTS
31 #define VECTORSPACING 0x100 /* for EI/VI mode */
34 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
35 struct kvm_stats_debugfs_item debugfs_entries[] = {
36 { "wait", VCPU_STAT(wait_exits) },
37 { "cache", VCPU_STAT(cache_exits) },
38 { "signal", VCPU_STAT(signal_exits) },
39 { "interrupt", VCPU_STAT(int_exits) },
40 { "cop_unsuable", VCPU_STAT(cop_unusable_exits) },
41 { "tlbmod", VCPU_STAT(tlbmod_exits) },
42 { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits) },
43 { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits) },
44 { "addrerr_st", VCPU_STAT(addrerr_st_exits) },
45 { "addrerr_ld", VCPU_STAT(addrerr_ld_exits) },
46 { "syscall", VCPU_STAT(syscall_exits) },
47 { "resvd_inst", VCPU_STAT(resvd_inst_exits) },
48 { "break_inst", VCPU_STAT(break_inst_exits) },
49 { "flush_dcache", VCPU_STAT(flush_dcache_exits) },
50 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
54 static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
57 for_each_possible_cpu(i) {
58 vcpu->arch.guest_kernel_asid[i] = 0;
59 vcpu->arch.guest_user_asid[i] = 0;
64 /* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we
65 * are "runnable" if interrupts are pending
67 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
69 return !!(vcpu->arch.pending_exceptions);
72 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
77 int kvm_arch_hardware_enable(void *garbage)
82 void kvm_arch_hardware_disable(void *garbage)
86 int kvm_arch_hardware_setup(void)
91 void kvm_arch_hardware_unsetup(void)
95 void kvm_arch_check_processor_compat(void *rtn)
102 static void kvm_mips_init_tlbs(struct kvm *kvm)
106 /* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */
107 wired = read_c0_wired();
108 write_c0_wired(wired + 1);
110 kvm->arch.commpage_tlb = wired;
112 kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
113 kvm->arch.commpage_tlb);
116 static void kvm_mips_init_vm_percpu(void *arg)
118 struct kvm *kvm = (struct kvm *)arg;
120 kvm_mips_init_tlbs(kvm);
121 kvm_mips_callbacks->vm_init(kvm);
125 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
127 if (atomic_inc_return(&kvm_mips_instance) == 1) {
128 kvm_debug("%s: 1st KVM instance, setup host TLB parameters\n",
130 on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
137 void kvm_mips_free_vcpus(struct kvm *kvm)
140 struct kvm_vcpu *vcpu;
142 /* Put the pages we reserved for the guest pmap */
143 for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
144 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
145 kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
147 kfree(kvm->arch.guest_pmap);
149 kvm_for_each_vcpu(i, vcpu, kvm) {
150 kvm_arch_vcpu_free(vcpu);
153 mutex_lock(&kvm->lock);
155 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
156 kvm->vcpus[i] = NULL;
158 atomic_set(&kvm->online_vcpus, 0);
160 mutex_unlock(&kvm->lock);
163 void kvm_arch_sync_events(struct kvm *kvm)
167 static void kvm_mips_uninit_tlbs(void *arg)
169 /* Restore wired count */
172 /* Clear out all the TLBs */
173 kvm_local_flush_tlb_all();
176 void kvm_arch_destroy_vm(struct kvm *kvm)
178 kvm_mips_free_vcpus(kvm);
180 /* If this is the last instance, restore wired count */
181 if (atomic_dec_return(&kvm_mips_instance) == 0) {
182 kvm_debug("%s: last KVM instance, restoring TLB parameters\n",
184 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
189 kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
194 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
195 struct kvm_memory_slot *dont)
199 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
200 unsigned long npages)
205 void kvm_arch_memslots_updated(struct kvm *kvm)
209 int kvm_arch_prepare_memory_region(struct kvm *kvm,
210 struct kvm_memory_slot *memslot,
211 struct kvm_userspace_memory_region *mem,
212 enum kvm_mr_change change)
217 void kvm_arch_commit_memory_region(struct kvm *kvm,
218 struct kvm_userspace_memory_region *mem,
219 const struct kvm_memory_slot *old,
220 enum kvm_mr_change change)
222 unsigned long npages = 0;
225 kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
226 __func__, kvm, mem->slot, mem->guest_phys_addr,
227 mem->memory_size, mem->userspace_addr);
229 /* Setup Guest PMAP table */
230 if (!kvm->arch.guest_pmap) {
232 npages = mem->memory_size >> PAGE_SHIFT;
235 kvm->arch.guest_pmap_npages = npages;
236 kvm->arch.guest_pmap =
237 kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
239 if (!kvm->arch.guest_pmap) {
240 kvm_err("Failed to allocate guest PMAP");
245 kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
246 npages, kvm->arch.guest_pmap);
248 /* Now setup the page table */
249 for (i = 0; i < npages; i++) {
250 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
258 void kvm_arch_flush_shadow_all(struct kvm *kvm)
262 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
263 struct kvm_memory_slot *slot)
267 void kvm_arch_flush_shadow(struct kvm *kvm)
271 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
273 extern char mips32_exception[], mips32_exceptionEnd[];
274 extern char mips32_GuestException[], mips32_GuestExceptionEnd[];
275 int err, size, offset;
279 struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
286 err = kvm_vcpu_init(vcpu, kvm, id);
291 kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
293 /* Allocate space for host mode exception handlers that handle
296 if (cpu_has_veic || cpu_has_vint) {
297 size = 0x200 + VECTORSPACING * 64;
302 /* Save Linux EBASE */
303 vcpu->arch.host_ebase = (void *)read_c0_ebase();
305 gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
311 kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
312 ALIGN(size, PAGE_SIZE), gebase);
315 vcpu->arch.guest_ebase = gebase;
317 /* Copy L1 Guest Exception handler to correct offset */
319 /* TLB Refill, EXL = 0 */
320 memcpy(gebase, mips32_exception,
321 mips32_exceptionEnd - mips32_exception);
323 /* General Exception Entry point */
324 memcpy(gebase + 0x180, mips32_exception,
325 mips32_exceptionEnd - mips32_exception);
327 /* For vectored interrupts poke the exception code @ all offsets 0-7 */
328 for (i = 0; i < 8; i++) {
329 kvm_debug("L1 Vectored handler @ %p\n",
330 gebase + 0x200 + (i * VECTORSPACING));
331 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
332 mips32_exceptionEnd - mips32_exception);
335 /* General handler, relocate to unmapped space for sanity's sake */
337 kvm_debug("Installing KVM Exception handlers @ %p, %#x bytes\n",
339 mips32_GuestExceptionEnd - mips32_GuestException);
341 memcpy(gebase + offset, mips32_GuestException,
342 mips32_GuestExceptionEnd - mips32_GuestException);
344 /* Invalidate the icache for these ranges */
345 local_flush_icache_range((unsigned long)gebase,
346 (unsigned long)gebase + ALIGN(size, PAGE_SIZE));
348 /* Allocate comm page for guest kernel, a TLB will be reserved for mapping GVA @ 0xFFFF8000 to this page */
349 vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
351 if (!vcpu->arch.kseg0_commpage) {
353 goto out_free_gebase;
356 kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
357 kvm_mips_commpage_init(vcpu);
360 vcpu->arch.last_sched_cpu = -1;
362 /* Start off the timer */
363 kvm_mips_init_count(vcpu);
377 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
379 hrtimer_cancel(&vcpu->arch.comparecount_timer);
381 kvm_vcpu_uninit(vcpu);
383 kvm_mips_dump_stats(vcpu);
385 kfree(vcpu->arch.guest_ebase);
386 kfree(vcpu->arch.kseg0_commpage);
390 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
392 kvm_arch_vcpu_free(vcpu);
396 kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
397 struct kvm_guest_debug *dbg)
402 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
407 if (vcpu->sigset_active)
408 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
410 if (vcpu->mmio_needed) {
411 if (!vcpu->mmio_is_write)
412 kvm_mips_complete_mmio_load(vcpu, run);
413 vcpu->mmio_needed = 0;
417 /* Check if we have any exceptions/interrupts pending */
418 kvm_mips_deliver_interrupts(vcpu,
419 kvm_read_c0_guest_cause(vcpu->arch.cop0));
423 r = __kvm_mips_vcpu_run(run, vcpu);
428 if (vcpu->sigset_active)
429 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
435 kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
437 int intr = (int)irq->irq;
438 struct kvm_vcpu *dvcpu = NULL;
440 if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
441 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
447 dvcpu = vcpu->kvm->vcpus[irq->cpu];
449 if (intr == 2 || intr == 3 || intr == 4) {
450 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
452 } else if (intr == -2 || intr == -3 || intr == -4) {
453 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
455 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
460 dvcpu->arch.wait = 0;
462 if (waitqueue_active(&dvcpu->wq)) {
463 wake_up_interruptible(&dvcpu->wq);
470 kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
471 struct kvm_mp_state *mp_state)
477 kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
478 struct kvm_mp_state *mp_state)
483 static u64 kvm_mips_get_one_regs[] = {
521 KVM_REG_MIPS_CP0_INDEX,
522 KVM_REG_MIPS_CP0_CONTEXT,
523 KVM_REG_MIPS_CP0_USERLOCAL,
524 KVM_REG_MIPS_CP0_PAGEMASK,
525 KVM_REG_MIPS_CP0_WIRED,
526 KVM_REG_MIPS_CP0_HWRENA,
527 KVM_REG_MIPS_CP0_BADVADDR,
528 KVM_REG_MIPS_CP0_COUNT,
529 KVM_REG_MIPS_CP0_ENTRYHI,
530 KVM_REG_MIPS_CP0_COMPARE,
531 KVM_REG_MIPS_CP0_STATUS,
532 KVM_REG_MIPS_CP0_CAUSE,
533 KVM_REG_MIPS_CP0_EPC,
534 KVM_REG_MIPS_CP0_CONFIG,
535 KVM_REG_MIPS_CP0_CONFIG1,
536 KVM_REG_MIPS_CP0_CONFIG2,
537 KVM_REG_MIPS_CP0_CONFIG3,
538 KVM_REG_MIPS_CP0_CONFIG7,
539 KVM_REG_MIPS_CP0_ERROREPC,
541 KVM_REG_MIPS_COUNT_CTL,
542 KVM_REG_MIPS_COUNT_RESUME,
543 KVM_REG_MIPS_COUNT_HZ,
546 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
547 const struct kvm_one_reg *reg)
549 struct mips_coproc *cop0 = vcpu->arch.cop0;
554 case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
555 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
557 case KVM_REG_MIPS_HI:
558 v = (long)vcpu->arch.hi;
560 case KVM_REG_MIPS_LO:
561 v = (long)vcpu->arch.lo;
563 case KVM_REG_MIPS_PC:
564 v = (long)vcpu->arch.pc;
567 case KVM_REG_MIPS_CP0_INDEX:
568 v = (long)kvm_read_c0_guest_index(cop0);
570 case KVM_REG_MIPS_CP0_CONTEXT:
571 v = (long)kvm_read_c0_guest_context(cop0);
573 case KVM_REG_MIPS_CP0_USERLOCAL:
574 v = (long)kvm_read_c0_guest_userlocal(cop0);
576 case KVM_REG_MIPS_CP0_PAGEMASK:
577 v = (long)kvm_read_c0_guest_pagemask(cop0);
579 case KVM_REG_MIPS_CP0_WIRED:
580 v = (long)kvm_read_c0_guest_wired(cop0);
582 case KVM_REG_MIPS_CP0_HWRENA:
583 v = (long)kvm_read_c0_guest_hwrena(cop0);
585 case KVM_REG_MIPS_CP0_BADVADDR:
586 v = (long)kvm_read_c0_guest_badvaddr(cop0);
588 case KVM_REG_MIPS_CP0_ENTRYHI:
589 v = (long)kvm_read_c0_guest_entryhi(cop0);
591 case KVM_REG_MIPS_CP0_COMPARE:
592 v = (long)kvm_read_c0_guest_compare(cop0);
594 case KVM_REG_MIPS_CP0_STATUS:
595 v = (long)kvm_read_c0_guest_status(cop0);
597 case KVM_REG_MIPS_CP0_CAUSE:
598 v = (long)kvm_read_c0_guest_cause(cop0);
600 case KVM_REG_MIPS_CP0_EPC:
601 v = (long)kvm_read_c0_guest_epc(cop0);
603 case KVM_REG_MIPS_CP0_ERROREPC:
604 v = (long)kvm_read_c0_guest_errorepc(cop0);
606 case KVM_REG_MIPS_CP0_CONFIG:
607 v = (long)kvm_read_c0_guest_config(cop0);
609 case KVM_REG_MIPS_CP0_CONFIG1:
610 v = (long)kvm_read_c0_guest_config1(cop0);
612 case KVM_REG_MIPS_CP0_CONFIG2:
613 v = (long)kvm_read_c0_guest_config2(cop0);
615 case KVM_REG_MIPS_CP0_CONFIG3:
616 v = (long)kvm_read_c0_guest_config3(cop0);
618 case KVM_REG_MIPS_CP0_CONFIG7:
619 v = (long)kvm_read_c0_guest_config7(cop0);
621 /* registers to be handled specially */
622 case KVM_REG_MIPS_CP0_COUNT:
623 case KVM_REG_MIPS_COUNT_CTL:
624 case KVM_REG_MIPS_COUNT_RESUME:
625 case KVM_REG_MIPS_COUNT_HZ:
626 ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v);
633 if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
634 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
635 return put_user(v, uaddr64);
636 } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
637 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
639 return put_user(v32, uaddr32);
645 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
646 const struct kvm_one_reg *reg)
648 struct mips_coproc *cop0 = vcpu->arch.cop0;
651 if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
652 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
654 if (get_user(v, uaddr64) != 0)
656 } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
657 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
660 if (get_user(v32, uaddr32) != 0)
668 case KVM_REG_MIPS_R0:
669 /* Silently ignore requests to set $0 */
671 case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
672 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
674 case KVM_REG_MIPS_HI:
677 case KVM_REG_MIPS_LO:
680 case KVM_REG_MIPS_PC:
684 case KVM_REG_MIPS_CP0_INDEX:
685 kvm_write_c0_guest_index(cop0, v);
687 case KVM_REG_MIPS_CP0_CONTEXT:
688 kvm_write_c0_guest_context(cop0, v);
690 case KVM_REG_MIPS_CP0_USERLOCAL:
691 kvm_write_c0_guest_userlocal(cop0, v);
693 case KVM_REG_MIPS_CP0_PAGEMASK:
694 kvm_write_c0_guest_pagemask(cop0, v);
696 case KVM_REG_MIPS_CP0_WIRED:
697 kvm_write_c0_guest_wired(cop0, v);
699 case KVM_REG_MIPS_CP0_HWRENA:
700 kvm_write_c0_guest_hwrena(cop0, v);
702 case KVM_REG_MIPS_CP0_BADVADDR:
703 kvm_write_c0_guest_badvaddr(cop0, v);
705 case KVM_REG_MIPS_CP0_ENTRYHI:
706 kvm_write_c0_guest_entryhi(cop0, v);
708 case KVM_REG_MIPS_CP0_STATUS:
709 kvm_write_c0_guest_status(cop0, v);
711 case KVM_REG_MIPS_CP0_EPC:
712 kvm_write_c0_guest_epc(cop0, v);
714 case KVM_REG_MIPS_CP0_ERROREPC:
715 kvm_write_c0_guest_errorepc(cop0, v);
717 /* registers to be handled specially */
718 case KVM_REG_MIPS_CP0_COUNT:
719 case KVM_REG_MIPS_CP0_COMPARE:
720 case KVM_REG_MIPS_CP0_CAUSE:
721 case KVM_REG_MIPS_COUNT_CTL:
722 case KVM_REG_MIPS_COUNT_RESUME:
723 case KVM_REG_MIPS_COUNT_HZ:
724 return kvm_mips_callbacks->set_one_reg(vcpu, reg, v);
732 kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
734 struct kvm_vcpu *vcpu = filp->private_data;
735 void __user *argp = (void __user *)arg;
739 case KVM_SET_ONE_REG:
740 case KVM_GET_ONE_REG: {
741 struct kvm_one_reg reg;
742 if (copy_from_user(®, argp, sizeof(reg)))
744 if (ioctl == KVM_SET_ONE_REG)
745 return kvm_mips_set_reg(vcpu, ®);
747 return kvm_mips_get_reg(vcpu, ®);
749 case KVM_GET_REG_LIST: {
750 struct kvm_reg_list __user *user_list = argp;
751 u64 __user *reg_dest;
752 struct kvm_reg_list reg_list;
755 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
758 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
759 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
763 reg_dest = user_list->reg;
764 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
765 sizeof(kvm_mips_get_one_regs)))
770 /* Treat the NMI as a CPU reset */
771 r = kvm_mips_reset_vcpu(vcpu);
775 struct kvm_mips_interrupt irq;
777 if (copy_from_user(&irq, argp, sizeof(irq)))
780 kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
783 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
795 * Get (and clear) the dirty memory log for a memory slot.
797 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
799 struct kvm_memory_slot *memslot;
800 unsigned long ga, ga_end;
805 mutex_lock(&kvm->slots_lock);
807 r = kvm_get_dirty_log(kvm, log, &is_dirty);
811 /* If nothing is dirty, don't bother messing with page tables. */
813 memslot = &kvm->memslots->memslots[log->slot];
815 ga = memslot->base_gfn << PAGE_SHIFT;
816 ga_end = ga + (memslot->npages << PAGE_SHIFT);
818 printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
821 n = kvm_dirty_bitmap_bytes(memslot);
822 memset(memslot->dirty_bitmap, 0, n);
827 mutex_unlock(&kvm->slots_lock);
832 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
844 int kvm_arch_init(void *opaque)
848 if (kvm_mips_callbacks) {
849 kvm_err("kvm: module already exists\n");
853 ret = kvm_mips_emulation_init(&kvm_mips_callbacks);
858 void kvm_arch_exit(void)
860 kvm_mips_callbacks = NULL;
864 kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
870 kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
875 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
880 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
885 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
890 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
892 return VM_FAULT_SIGBUS;
895 int kvm_dev_ioctl_check_extension(long ext)
900 case KVM_CAP_ONE_REG:
903 case KVM_CAP_COALESCED_MMIO:
904 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
913 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
915 return kvm_mips_pending_timer(vcpu);
918 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
921 struct mips_coproc *cop0;
926 printk("VCPU Register Dump:\n");
927 printk("\tpc = 0x%08lx\n", vcpu->arch.pc);
928 printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
930 for (i = 0; i < 32; i += 4) {
931 printk("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
933 vcpu->arch.gprs[i + 1],
934 vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
936 printk("\thi: 0x%08lx\n", vcpu->arch.hi);
937 printk("\tlo: 0x%08lx\n", vcpu->arch.lo);
939 cop0 = vcpu->arch.cop0;
940 printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
941 kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0));
943 printk("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
948 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
952 for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
953 vcpu->arch.gprs[i] = regs->gpr[i];
954 vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
955 vcpu->arch.hi = regs->hi;
956 vcpu->arch.lo = regs->lo;
957 vcpu->arch.pc = regs->pc;
962 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
966 for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
967 regs->gpr[i] = vcpu->arch.gprs[i];
969 regs->hi = vcpu->arch.hi;
970 regs->lo = vcpu->arch.lo;
971 regs->pc = vcpu->arch.pc;
976 static void kvm_mips_comparecount_func(unsigned long data)
978 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
980 kvm_mips_callbacks->queue_timer_int(vcpu);
983 if (waitqueue_active(&vcpu->wq)) {
984 wake_up_interruptible(&vcpu->wq);
989 * low level hrtimer wake routine.
991 static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
993 struct kvm_vcpu *vcpu;
995 vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
996 kvm_mips_comparecount_func((unsigned long) vcpu);
997 return kvm_mips_count_timeout(vcpu);
1000 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
1002 kvm_mips_callbacks->vcpu_init(vcpu);
1003 hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
1005 vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
1009 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
1015 kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr)
1020 /* Initial guest state */
1021 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1023 return kvm_mips_callbacks->vcpu_setup(vcpu);
1027 void kvm_mips_set_c0_status(void)
1029 uint32_t status = read_c0_status();
1032 status |= (ST0_CU1);
1037 write_c0_status(status);
1042 * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1044 int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1046 uint32_t cause = vcpu->arch.host_cp0_cause;
1047 uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1048 uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1049 unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1050 enum emulation_result er = EMULATE_DONE;
1051 int ret = RESUME_GUEST;
1053 /* Set a default exit reason */
1054 run->exit_reason = KVM_EXIT_UNKNOWN;
1055 run->ready_for_interrupt_injection = 1;
1057 /* Set the appropriate status bits based on host CPU features, before we hit the scheduler */
1058 kvm_mips_set_c0_status();
1062 kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1063 cause, opc, run, vcpu);
1065 /* Do a privilege check, if in UM most of these exit conditions end up
1066 * causing an exception to be delivered to the Guest Kernel
1068 er = kvm_mips_check_privilege(cause, opc, run, vcpu);
1069 if (er == EMULATE_PRIV_FAIL) {
1071 } else if (er == EMULATE_FAIL) {
1072 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1079 kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
1081 ++vcpu->stat.int_exits;
1082 trace_kvm_exit(vcpu, INT_EXITS);
1084 if (need_resched()) {
1091 case T_COP_UNUSABLE:
1092 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1094 ++vcpu->stat.cop_unusable_exits;
1095 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1096 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1097 /* XXXKYMA: Might need to return to user space */
1098 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) {
1104 ++vcpu->stat.tlbmod_exits;
1105 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1106 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1111 ("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1112 cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1115 ++vcpu->stat.tlbmiss_st_exits;
1116 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1117 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1121 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1122 cause, opc, badvaddr);
1124 ++vcpu->stat.tlbmiss_ld_exits;
1125 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1126 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1130 ++vcpu->stat.addrerr_st_exits;
1131 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1132 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1136 ++vcpu->stat.addrerr_ld_exits;
1137 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1138 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1142 ++vcpu->stat.syscall_exits;
1143 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1144 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1148 ++vcpu->stat.resvd_inst_exits;
1149 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1150 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1154 ++vcpu->stat.break_inst_exits;
1155 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1156 ret = kvm_mips_callbacks->handle_break(vcpu);
1161 ("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n",
1162 exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1163 kvm_read_c0_guest_status(vcpu->arch.cop0));
1164 kvm_arch_vcpu_dump_regs(vcpu);
1165 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1172 local_irq_disable();
1174 if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1175 kvm_mips_deliver_interrupts(vcpu, cause);
1177 if (!(ret & RESUME_HOST)) {
1178 /* Only check for signals if not already exiting to userspace */
1179 if (signal_pending(current)) {
1180 run->exit_reason = KVM_EXIT_INTR;
1181 ret = (-EINTR << 2) | RESUME_HOST;
1182 ++vcpu->stat.signal_exits;
1183 trace_kvm_exit(vcpu, SIGNAL_EXITS);
1190 int __init kvm_mips_init(void)
1194 ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1199 /* On MIPS, kernel modules are executed from "mapped space", which requires TLBs.
1200 * The TLB handling code is statically linked with the rest of the kernel (kvm_tlb.c)
1201 * to avoid the possibility of double faulting. The issue is that the TLB code
1202 * references routines that are part of the the KVM module,
1203 * which are only available once the module is loaded.
1205 kvm_mips_gfn_to_pfn = gfn_to_pfn;
1206 kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1207 kvm_mips_is_error_pfn = is_error_pfn;
1209 pr_info("KVM/MIPS Initialized\n");
1213 void __exit kvm_mips_exit(void)
1217 kvm_mips_gfn_to_pfn = NULL;
1218 kvm_mips_release_pfn_clean = NULL;
1219 kvm_mips_is_error_pfn = NULL;
1221 pr_info("KVM/MIPS unloaded\n");
1224 module_init(kvm_mips_init);
1225 module_exit(kvm_mips_exit);
1227 EXPORT_TRACEPOINT_SYMBOL(kvm_exit);