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>
20 #include <asm/cacheflush.h>
21 #include <asm/mmu_context.h>
22 #include <asm/pgtable.h>
24 #include <linux/kvm_host.h>
26 #include "interrupt.h"
29 #define CREATE_TRACE_POINTS
33 #define VECTORSPACING 0x100 /* for EI/VI mode */
36 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x)
37 struct kvm_stats_debugfs_item debugfs_entries[] = {
38 { "wait", VCPU_STAT(wait_exits), KVM_STAT_VCPU },
39 { "cache", VCPU_STAT(cache_exits), KVM_STAT_VCPU },
40 { "signal", VCPU_STAT(signal_exits), KVM_STAT_VCPU },
41 { "interrupt", VCPU_STAT(int_exits), KVM_STAT_VCPU },
42 { "cop_unsuable", VCPU_STAT(cop_unusable_exits), KVM_STAT_VCPU },
43 { "tlbmod", VCPU_STAT(tlbmod_exits), KVM_STAT_VCPU },
44 { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits), KVM_STAT_VCPU },
45 { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits), KVM_STAT_VCPU },
46 { "addrerr_st", VCPU_STAT(addrerr_st_exits), KVM_STAT_VCPU },
47 { "addrerr_ld", VCPU_STAT(addrerr_ld_exits), KVM_STAT_VCPU },
48 { "syscall", VCPU_STAT(syscall_exits), KVM_STAT_VCPU },
49 { "resvd_inst", VCPU_STAT(resvd_inst_exits), KVM_STAT_VCPU },
50 { "break_inst", VCPU_STAT(break_inst_exits), KVM_STAT_VCPU },
51 { "trap_inst", VCPU_STAT(trap_inst_exits), KVM_STAT_VCPU },
52 { "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU },
53 { "halt_successful_poll", VCPU_STAT(halt_successful_poll), KVM_STAT_VCPU },
54 { "halt_wakeup", VCPU_STAT(halt_wakeup), KVM_STAT_VCPU },
58 static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
62 for_each_possible_cpu(i) {
63 vcpu->arch.guest_kernel_asid[i] = 0;
64 vcpu->arch.guest_user_asid[i] = 0;
71 * XXXKYMA: We are simulatoring a processor that has the WII bit set in
72 * Config7, so we are "runnable" if interrupts are pending
74 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
76 return !!(vcpu->arch.pending_exceptions);
79 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
84 int kvm_arch_hardware_enable(void)
89 int kvm_arch_hardware_setup(void)
94 void kvm_arch_check_processor_compat(void *rtn)
99 static void kvm_mips_init_tlbs(struct kvm *kvm)
104 * Add a wired entry to the TLB, it is used to map the commpage to
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);
136 void kvm_mips_free_vcpus(struct kvm *kvm)
139 struct kvm_vcpu *vcpu;
141 /* Put the pages we reserved for the guest pmap */
142 for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
143 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
144 kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
146 kfree(kvm->arch.guest_pmap);
148 kvm_for_each_vcpu(i, vcpu, kvm) {
149 kvm_arch_vcpu_free(vcpu);
152 mutex_lock(&kvm->lock);
154 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
155 kvm->vcpus[i] = NULL;
157 atomic_set(&kvm->online_vcpus, 0);
159 mutex_unlock(&kvm->lock);
162 static void kvm_mips_uninit_tlbs(void *arg)
164 /* Restore wired count */
167 /* Clear out all the TLBs */
168 kvm_local_flush_tlb_all();
171 void kvm_arch_destroy_vm(struct kvm *kvm)
173 kvm_mips_free_vcpus(kvm);
175 /* If this is the last instance, restore wired count */
176 if (atomic_dec_return(&kvm_mips_instance) == 0) {
177 kvm_debug("%s: last KVM instance, restoring TLB parameters\n",
179 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
183 long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl,
189 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
190 unsigned long npages)
195 int kvm_arch_prepare_memory_region(struct kvm *kvm,
196 struct kvm_memory_slot *memslot,
197 struct kvm_userspace_memory_region *mem,
198 enum kvm_mr_change change)
203 void kvm_arch_commit_memory_region(struct kvm *kvm,
204 struct kvm_userspace_memory_region *mem,
205 const struct kvm_memory_slot *old,
206 enum kvm_mr_change change)
208 unsigned long npages = 0;
211 kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
212 __func__, kvm, mem->slot, mem->guest_phys_addr,
213 mem->memory_size, mem->userspace_addr);
215 /* Setup Guest PMAP table */
216 if (!kvm->arch.guest_pmap) {
218 npages = mem->memory_size >> PAGE_SHIFT;
221 kvm->arch.guest_pmap_npages = npages;
222 kvm->arch.guest_pmap =
223 kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
225 if (!kvm->arch.guest_pmap) {
226 kvm_err("Failed to allocate guest PMAP");
230 kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
231 npages, kvm->arch.guest_pmap);
233 /* Now setup the page table */
234 for (i = 0; i < npages; i++)
235 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
240 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
242 int err, size, offset;
246 struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
253 err = kvm_vcpu_init(vcpu, kvm, id);
258 kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
261 * Allocate space for host mode exception handlers that handle
264 if (cpu_has_veic || cpu_has_vint)
265 size = 0x200 + VECTORSPACING * 64;
269 /* Save Linux EBASE */
270 vcpu->arch.host_ebase = (void *)read_c0_ebase();
272 gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
278 kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
279 ALIGN(size, PAGE_SIZE), gebase);
282 vcpu->arch.guest_ebase = gebase;
284 /* Copy L1 Guest Exception handler to correct offset */
286 /* TLB Refill, EXL = 0 */
287 memcpy(gebase, mips32_exception,
288 mips32_exceptionEnd - mips32_exception);
290 /* General Exception Entry point */
291 memcpy(gebase + 0x180, mips32_exception,
292 mips32_exceptionEnd - mips32_exception);
294 /* For vectored interrupts poke the exception code @ all offsets 0-7 */
295 for (i = 0; i < 8; i++) {
296 kvm_debug("L1 Vectored handler @ %p\n",
297 gebase + 0x200 + (i * VECTORSPACING));
298 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
299 mips32_exceptionEnd - mips32_exception);
302 /* General handler, relocate to unmapped space for sanity's sake */
304 kvm_debug("Installing KVM Exception handlers @ %p, %#x bytes\n",
306 mips32_GuestExceptionEnd - mips32_GuestException);
308 memcpy(gebase + offset, mips32_GuestException,
309 mips32_GuestExceptionEnd - mips32_GuestException);
311 /* Invalidate the icache for these ranges */
312 local_flush_icache_range((unsigned long)gebase,
313 (unsigned long)gebase + ALIGN(size, PAGE_SIZE));
316 * Allocate comm page for guest kernel, a TLB will be reserved for
317 * mapping GVA @ 0xFFFF8000 to this page
319 vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
321 if (!vcpu->arch.kseg0_commpage) {
323 goto out_free_gebase;
326 kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
327 kvm_mips_commpage_init(vcpu);
330 vcpu->arch.last_sched_cpu = -1;
332 /* Start off the timer */
333 kvm_mips_init_count(vcpu);
347 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
349 hrtimer_cancel(&vcpu->arch.comparecount_timer);
351 kvm_vcpu_uninit(vcpu);
353 kvm_mips_dump_stats(vcpu);
355 kfree(vcpu->arch.guest_ebase);
356 kfree(vcpu->arch.kseg0_commpage);
360 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
362 kvm_arch_vcpu_free(vcpu);
365 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
366 struct kvm_guest_debug *dbg)
371 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
376 if (vcpu->sigset_active)
377 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
379 if (vcpu->mmio_needed) {
380 if (!vcpu->mmio_is_write)
381 kvm_mips_complete_mmio_load(vcpu, run);
382 vcpu->mmio_needed = 0;
388 /* Check if we have any exceptions/interrupts pending */
389 kvm_mips_deliver_interrupts(vcpu,
390 kvm_read_c0_guest_cause(vcpu->arch.cop0));
394 /* Disable hardware page table walking while in guest */
397 r = __kvm_mips_vcpu_run(run, vcpu);
399 /* Re-enable HTW before enabling interrupts */
405 if (vcpu->sigset_active)
406 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
411 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
412 struct kvm_mips_interrupt *irq)
414 int intr = (int)irq->irq;
415 struct kvm_vcpu *dvcpu = NULL;
417 if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
418 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
424 dvcpu = vcpu->kvm->vcpus[irq->cpu];
426 if (intr == 2 || intr == 3 || intr == 4) {
427 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
429 } else if (intr == -2 || intr == -3 || intr == -4) {
430 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
432 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
437 dvcpu->arch.wait = 0;
439 if (waitqueue_active(&dvcpu->wq))
440 wake_up_interruptible(&dvcpu->wq);
445 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
446 struct kvm_mp_state *mp_state)
451 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
452 struct kvm_mp_state *mp_state)
457 static u64 kvm_mips_get_one_regs[] = {
495 KVM_REG_MIPS_CP0_INDEX,
496 KVM_REG_MIPS_CP0_CONTEXT,
497 KVM_REG_MIPS_CP0_USERLOCAL,
498 KVM_REG_MIPS_CP0_PAGEMASK,
499 KVM_REG_MIPS_CP0_WIRED,
500 KVM_REG_MIPS_CP0_HWRENA,
501 KVM_REG_MIPS_CP0_BADVADDR,
502 KVM_REG_MIPS_CP0_COUNT,
503 KVM_REG_MIPS_CP0_ENTRYHI,
504 KVM_REG_MIPS_CP0_COMPARE,
505 KVM_REG_MIPS_CP0_STATUS,
506 KVM_REG_MIPS_CP0_CAUSE,
507 KVM_REG_MIPS_CP0_EPC,
508 KVM_REG_MIPS_CP0_CONFIG,
509 KVM_REG_MIPS_CP0_CONFIG1,
510 KVM_REG_MIPS_CP0_CONFIG2,
511 KVM_REG_MIPS_CP0_CONFIG3,
512 KVM_REG_MIPS_CP0_CONFIG7,
513 KVM_REG_MIPS_CP0_ERROREPC,
515 KVM_REG_MIPS_COUNT_CTL,
516 KVM_REG_MIPS_COUNT_RESUME,
517 KVM_REG_MIPS_COUNT_HZ,
520 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
521 const struct kvm_one_reg *reg)
523 struct mips_coproc *cop0 = vcpu->arch.cop0;
528 case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
529 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
531 case KVM_REG_MIPS_HI:
532 v = (long)vcpu->arch.hi;
534 case KVM_REG_MIPS_LO:
535 v = (long)vcpu->arch.lo;
537 case KVM_REG_MIPS_PC:
538 v = (long)vcpu->arch.pc;
541 case KVM_REG_MIPS_CP0_INDEX:
542 v = (long)kvm_read_c0_guest_index(cop0);
544 case KVM_REG_MIPS_CP0_CONTEXT:
545 v = (long)kvm_read_c0_guest_context(cop0);
547 case KVM_REG_MIPS_CP0_USERLOCAL:
548 v = (long)kvm_read_c0_guest_userlocal(cop0);
550 case KVM_REG_MIPS_CP0_PAGEMASK:
551 v = (long)kvm_read_c0_guest_pagemask(cop0);
553 case KVM_REG_MIPS_CP0_WIRED:
554 v = (long)kvm_read_c0_guest_wired(cop0);
556 case KVM_REG_MIPS_CP0_HWRENA:
557 v = (long)kvm_read_c0_guest_hwrena(cop0);
559 case KVM_REG_MIPS_CP0_BADVADDR:
560 v = (long)kvm_read_c0_guest_badvaddr(cop0);
562 case KVM_REG_MIPS_CP0_ENTRYHI:
563 v = (long)kvm_read_c0_guest_entryhi(cop0);
565 case KVM_REG_MIPS_CP0_COMPARE:
566 v = (long)kvm_read_c0_guest_compare(cop0);
568 case KVM_REG_MIPS_CP0_STATUS:
569 v = (long)kvm_read_c0_guest_status(cop0);
571 case KVM_REG_MIPS_CP0_CAUSE:
572 v = (long)kvm_read_c0_guest_cause(cop0);
574 case KVM_REG_MIPS_CP0_EPC:
575 v = (long)kvm_read_c0_guest_epc(cop0);
577 case KVM_REG_MIPS_CP0_ERROREPC:
578 v = (long)kvm_read_c0_guest_errorepc(cop0);
580 case KVM_REG_MIPS_CP0_CONFIG:
581 v = (long)kvm_read_c0_guest_config(cop0);
583 case KVM_REG_MIPS_CP0_CONFIG1:
584 v = (long)kvm_read_c0_guest_config1(cop0);
586 case KVM_REG_MIPS_CP0_CONFIG2:
587 v = (long)kvm_read_c0_guest_config2(cop0);
589 case KVM_REG_MIPS_CP0_CONFIG3:
590 v = (long)kvm_read_c0_guest_config3(cop0);
592 case KVM_REG_MIPS_CP0_CONFIG7:
593 v = (long)kvm_read_c0_guest_config7(cop0);
595 /* registers to be handled specially */
596 case KVM_REG_MIPS_CP0_COUNT:
597 case KVM_REG_MIPS_COUNT_CTL:
598 case KVM_REG_MIPS_COUNT_RESUME:
599 case KVM_REG_MIPS_COUNT_HZ:
600 ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v);
607 if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
608 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
610 return put_user(v, uaddr64);
611 } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
612 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
615 return put_user(v32, uaddr32);
621 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
622 const struct kvm_one_reg *reg)
624 struct mips_coproc *cop0 = vcpu->arch.cop0;
627 if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
628 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
630 if (get_user(v, uaddr64) != 0)
632 } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
633 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
636 if (get_user(v32, uaddr32) != 0)
644 case KVM_REG_MIPS_R0:
645 /* Silently ignore requests to set $0 */
647 case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
648 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
650 case KVM_REG_MIPS_HI:
653 case KVM_REG_MIPS_LO:
656 case KVM_REG_MIPS_PC:
660 case KVM_REG_MIPS_CP0_INDEX:
661 kvm_write_c0_guest_index(cop0, v);
663 case KVM_REG_MIPS_CP0_CONTEXT:
664 kvm_write_c0_guest_context(cop0, v);
666 case KVM_REG_MIPS_CP0_USERLOCAL:
667 kvm_write_c0_guest_userlocal(cop0, v);
669 case KVM_REG_MIPS_CP0_PAGEMASK:
670 kvm_write_c0_guest_pagemask(cop0, v);
672 case KVM_REG_MIPS_CP0_WIRED:
673 kvm_write_c0_guest_wired(cop0, v);
675 case KVM_REG_MIPS_CP0_HWRENA:
676 kvm_write_c0_guest_hwrena(cop0, v);
678 case KVM_REG_MIPS_CP0_BADVADDR:
679 kvm_write_c0_guest_badvaddr(cop0, v);
681 case KVM_REG_MIPS_CP0_ENTRYHI:
682 kvm_write_c0_guest_entryhi(cop0, v);
684 case KVM_REG_MIPS_CP0_STATUS:
685 kvm_write_c0_guest_status(cop0, v);
687 case KVM_REG_MIPS_CP0_EPC:
688 kvm_write_c0_guest_epc(cop0, v);
690 case KVM_REG_MIPS_CP0_ERROREPC:
691 kvm_write_c0_guest_errorepc(cop0, v);
693 /* registers to be handled specially */
694 case KVM_REG_MIPS_CP0_COUNT:
695 case KVM_REG_MIPS_CP0_COMPARE:
696 case KVM_REG_MIPS_CP0_CAUSE:
697 case KVM_REG_MIPS_COUNT_CTL:
698 case KVM_REG_MIPS_COUNT_RESUME:
699 case KVM_REG_MIPS_COUNT_HZ:
700 return kvm_mips_callbacks->set_one_reg(vcpu, reg, v);
707 long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
710 struct kvm_vcpu *vcpu = filp->private_data;
711 void __user *argp = (void __user *)arg;
715 case KVM_SET_ONE_REG:
716 case KVM_GET_ONE_REG: {
717 struct kvm_one_reg reg;
719 if (copy_from_user(®, argp, sizeof(reg)))
721 if (ioctl == KVM_SET_ONE_REG)
722 return kvm_mips_set_reg(vcpu, ®);
724 return kvm_mips_get_reg(vcpu, ®);
726 case KVM_GET_REG_LIST: {
727 struct kvm_reg_list __user *user_list = argp;
728 u64 __user *reg_dest;
729 struct kvm_reg_list reg_list;
732 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
735 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
736 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
740 reg_dest = user_list->reg;
741 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
742 sizeof(kvm_mips_get_one_regs)))
747 /* Treat the NMI as a CPU reset */
748 r = kvm_mips_reset_vcpu(vcpu);
752 struct kvm_mips_interrupt irq;
755 if (copy_from_user(&irq, argp, sizeof(irq)))
758 kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
761 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
772 /* Get (and clear) the dirty memory log for a memory slot. */
773 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
775 struct kvm_memory_slot *memslot;
776 unsigned long ga, ga_end;
781 mutex_lock(&kvm->slots_lock);
783 r = kvm_get_dirty_log(kvm, log, &is_dirty);
787 /* If nothing is dirty, don't bother messing with page tables. */
789 memslot = &kvm->memslots->memslots[log->slot];
791 ga = memslot->base_gfn << PAGE_SHIFT;
792 ga_end = ga + (memslot->npages << PAGE_SHIFT);
794 kvm_info("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
797 n = kvm_dirty_bitmap_bytes(memslot);
798 memset(memslot->dirty_bitmap, 0, n);
803 mutex_unlock(&kvm->slots_lock);
808 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
820 int kvm_arch_init(void *opaque)
822 if (kvm_mips_callbacks) {
823 kvm_err("kvm: module already exists\n");
827 return kvm_mips_emulation_init(&kvm_mips_callbacks);
830 void kvm_arch_exit(void)
832 kvm_mips_callbacks = NULL;
835 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
836 struct kvm_sregs *sregs)
841 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
842 struct kvm_sregs *sregs)
847 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
851 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
856 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
861 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
863 return VM_FAULT_SIGBUS;
866 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
871 case KVM_CAP_ONE_REG:
874 case KVM_CAP_COALESCED_MMIO:
875 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
884 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
886 return kvm_mips_pending_timer(vcpu);
889 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
892 struct mips_coproc *cop0;
897 kvm_debug("VCPU Register Dump:\n");
898 kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc);
899 kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
901 for (i = 0; i < 32; i += 4) {
902 kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
904 vcpu->arch.gprs[i + 1],
905 vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
907 kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi);
908 kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo);
910 cop0 = vcpu->arch.cop0;
911 kvm_debug("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
912 kvm_read_c0_guest_status(cop0),
913 kvm_read_c0_guest_cause(cop0));
915 kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
920 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
924 for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
925 vcpu->arch.gprs[i] = regs->gpr[i];
926 vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
927 vcpu->arch.hi = regs->hi;
928 vcpu->arch.lo = regs->lo;
929 vcpu->arch.pc = regs->pc;
934 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
938 for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
939 regs->gpr[i] = vcpu->arch.gprs[i];
941 regs->hi = vcpu->arch.hi;
942 regs->lo = vcpu->arch.lo;
943 regs->pc = vcpu->arch.pc;
948 static void kvm_mips_comparecount_func(unsigned long data)
950 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
952 kvm_mips_callbacks->queue_timer_int(vcpu);
955 if (waitqueue_active(&vcpu->wq))
956 wake_up_interruptible(&vcpu->wq);
959 /* low level hrtimer wake routine */
960 static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
962 struct kvm_vcpu *vcpu;
964 vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
965 kvm_mips_comparecount_func((unsigned long) vcpu);
966 return kvm_mips_count_timeout(vcpu);
969 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
971 kvm_mips_callbacks->vcpu_init(vcpu);
972 hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
974 vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
978 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
979 struct kvm_translation *tr)
984 /* Initial guest state */
985 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
987 return kvm_mips_callbacks->vcpu_setup(vcpu);
990 static void kvm_mips_set_c0_status(void)
992 uint32_t status = read_c0_status();
997 write_c0_status(status);
1002 * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1004 int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1006 uint32_t cause = vcpu->arch.host_cp0_cause;
1007 uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1008 uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1009 unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1010 enum emulation_result er = EMULATE_DONE;
1011 int ret = RESUME_GUEST;
1013 /* re-enable HTW before enabling interrupts */
1016 /* Set a default exit reason */
1017 run->exit_reason = KVM_EXIT_UNKNOWN;
1018 run->ready_for_interrupt_injection = 1;
1021 * Set the appropriate status bits based on host CPU features,
1022 * before we hit the scheduler
1024 kvm_mips_set_c0_status();
1028 kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1029 cause, opc, run, vcpu);
1032 * Do a privilege check, if in UM most of these exit conditions end up
1033 * causing an exception to be delivered to the Guest Kernel
1035 er = kvm_mips_check_privilege(cause, opc, run, vcpu);
1036 if (er == EMULATE_PRIV_FAIL) {
1038 } else if (er == EMULATE_FAIL) {
1039 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1046 kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
1048 ++vcpu->stat.int_exits;
1049 trace_kvm_exit(vcpu, INT_EXITS);
1057 case T_COP_UNUSABLE:
1058 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1060 ++vcpu->stat.cop_unusable_exits;
1061 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1062 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1063 /* XXXKYMA: Might need to return to user space */
1064 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN)
1069 ++vcpu->stat.tlbmod_exits;
1070 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1071 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1075 kvm_debug("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1076 cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1079 ++vcpu->stat.tlbmiss_st_exits;
1080 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1081 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1085 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1086 cause, opc, badvaddr);
1088 ++vcpu->stat.tlbmiss_ld_exits;
1089 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1090 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1094 ++vcpu->stat.addrerr_st_exits;
1095 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1096 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1100 ++vcpu->stat.addrerr_ld_exits;
1101 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1102 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1106 ++vcpu->stat.syscall_exits;
1107 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1108 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1112 ++vcpu->stat.resvd_inst_exits;
1113 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1114 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1118 ++vcpu->stat.break_inst_exits;
1119 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1120 ret = kvm_mips_callbacks->handle_break(vcpu);
1124 ++vcpu->stat.trap_inst_exits;
1125 trace_kvm_exit(vcpu, TRAP_INST_EXITS);
1126 ret = kvm_mips_callbacks->handle_trap(vcpu);
1130 ret = kvm_mips_callbacks->handle_msa_disabled(vcpu);
1134 kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n",
1135 exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1136 kvm_read_c0_guest_status(vcpu->arch.cop0));
1137 kvm_arch_vcpu_dump_regs(vcpu);
1138 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1145 local_irq_disable();
1147 if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1148 kvm_mips_deliver_interrupts(vcpu, cause);
1150 if (!(ret & RESUME_HOST)) {
1151 /* Only check for signals if not already exiting to userspace */
1152 if (signal_pending(current)) {
1153 run->exit_reason = KVM_EXIT_INTR;
1154 ret = (-EINTR << 2) | RESUME_HOST;
1155 ++vcpu->stat.signal_exits;
1156 trace_kvm_exit(vcpu, SIGNAL_EXITS);
1160 /* Disable HTW before returning to guest or host */
1166 int __init kvm_mips_init(void)
1170 ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1176 * On MIPS, kernel modules are executed from "mapped space", which
1177 * requires TLBs. The TLB handling code is statically linked with
1178 * the rest of the kernel (tlb.c) to avoid the possibility of
1179 * double faulting. The issue is that the TLB code references
1180 * routines that are part of the the KVM module, which are only
1181 * available once the module is loaded.
1183 kvm_mips_gfn_to_pfn = gfn_to_pfn;
1184 kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1185 kvm_mips_is_error_pfn = is_error_pfn;
1187 pr_info("KVM/MIPS Initialized\n");
1191 void __exit kvm_mips_exit(void)
1195 kvm_mips_gfn_to_pfn = NULL;
1196 kvm_mips_release_pfn_clean = NULL;
1197 kvm_mips_is_error_pfn = NULL;
1199 pr_info("KVM/MIPS unloaded\n");
1202 module_init(kvm_mips_init);
1203 module_exit(kvm_mips_exit);
1205 EXPORT_TRACEPOINT_SYMBOL(kvm_exit);