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 TLB handling, this file is part of the Linux host kernel so that
7 * TLB handlers run from KSEG0
9 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
10 * Authors: Sanjay Lal <sanjayl@kymasys.com>
13 #include <linux/sched.h>
14 #include <linux/smp.h>
16 #include <linux/delay.h>
17 #include <linux/module.h>
18 #include <linux/kvm_host.h>
19 #include <linux/srcu.h>
22 #include <asm/bootinfo.h>
23 #include <asm/mmu_context.h>
24 #include <asm/pgtable.h>
25 #include <asm/cacheflush.h>
29 #include <asm/r4kcache.h>
30 #define CONFIG_MIPS_MT
32 #define KVM_GUEST_PC_TLB 0
33 #define KVM_GUEST_SP_TLB 1
37 atomic_t kvm_mips_instance;
38 EXPORT_SYMBOL(kvm_mips_instance);
40 /* These function pointers are initialized once the KVM module is loaded */
41 pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn);
42 EXPORT_SYMBOL(kvm_mips_gfn_to_pfn);
44 void (*kvm_mips_release_pfn_clean)(pfn_t pfn);
45 EXPORT_SYMBOL(kvm_mips_release_pfn_clean);
47 bool (*kvm_mips_is_error_pfn)(pfn_t pfn);
48 EXPORT_SYMBOL(kvm_mips_is_error_pfn);
50 uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
52 return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK;
55 uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
57 return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK;
60 inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu)
62 return vcpu->kvm->arch.commpage_tlb;
65 /* Structure defining an tlb entry data set. */
67 void kvm_mips_dump_host_tlbs(void)
69 unsigned long old_entryhi;
70 unsigned long old_pagemask;
71 struct kvm_mips_tlb tlb;
75 local_irq_save(flags);
77 old_entryhi = read_c0_entryhi();
78 old_pagemask = read_c0_pagemask();
80 kvm_info("HOST TLBs:\n");
81 kvm_info("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK);
83 for (i = 0; i < current_cpu_data.tlbsize; i++) {
90 tlb.tlb_hi = read_c0_entryhi();
91 tlb.tlb_lo0 = read_c0_entrylo0();
92 tlb.tlb_lo1 = read_c0_entrylo1();
93 tlb.tlb_mask = read_c0_pagemask();
95 kvm_info("TLB%c%3d Hi 0x%08lx ",
96 (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
98 kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
99 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
100 (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
101 (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
102 (tlb.tlb_lo0 >> 3) & 7);
103 kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
104 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
105 (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
106 (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
107 (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
109 write_c0_entryhi(old_entryhi);
110 write_c0_pagemask(old_pagemask);
112 local_irq_restore(flags);
114 EXPORT_SYMBOL(kvm_mips_dump_host_tlbs);
116 void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu)
118 struct mips_coproc *cop0 = vcpu->arch.cop0;
119 struct kvm_mips_tlb tlb;
122 kvm_info("Guest TLBs:\n");
123 kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0));
125 for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
126 tlb = vcpu->arch.guest_tlb[i];
127 kvm_info("TLB%c%3d Hi 0x%08lx ",
128 (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
130 kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
131 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
132 (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
133 (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
134 (tlb.tlb_lo0 >> 3) & 7);
135 kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
136 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
137 (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
138 (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
139 (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
142 EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs);
144 static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
146 int srcu_idx, err = 0;
149 if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
152 srcu_idx = srcu_read_lock(&kvm->srcu);
153 pfn = kvm_mips_gfn_to_pfn(kvm, gfn);
155 if (is_error_noslot_pfn(pfn)) {
156 kvm_err("Couldn't get pfn for gfn %#" PRIx64 "!\n", gfn);
161 kvm->arch.guest_pmap[gfn] = pfn;
163 srcu_read_unlock(&kvm->srcu, srcu_idx);
167 /* Translate guest KSEG0 addresses to Host PA */
168 unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
172 uint32_t offset = gva & ~PAGE_MASK;
173 struct kvm *kvm = vcpu->kvm;
175 if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) {
176 kvm_err("%s/%p: Invalid gva: %#lx\n", __func__,
177 __builtin_return_address(0), gva);
178 return KVM_INVALID_PAGE;
181 gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT);
183 if (gfn >= kvm->arch.guest_pmap_npages) {
184 kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn,
186 return KVM_INVALID_PAGE;
189 if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
190 return KVM_INVALID_ADDR;
192 return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset;
194 EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa);
196 /* XXXKYMA: Must be called with interrupts disabled */
197 /* set flush_dcache_mask == 0 if no dcache flush required */
198 int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
199 unsigned long entrylo0, unsigned long entrylo1,
200 int flush_dcache_mask)
203 unsigned long old_entryhi;
206 local_irq_save(flags);
208 old_entryhi = read_c0_entryhi();
209 write_c0_entryhi(entryhi);
214 idx = read_c0_index();
216 if (idx > current_cpu_data.tlbsize) {
217 kvm_err("%s: Invalid Index: %d\n", __func__, idx);
218 kvm_mips_dump_host_tlbs();
219 local_irq_restore(flags);
223 write_c0_entrylo0(entrylo0);
224 write_c0_entrylo1(entrylo1);
233 kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n",
234 vcpu->arch.pc, idx, read_c0_entryhi(),
235 read_c0_entrylo0(), read_c0_entrylo1());
238 if (flush_dcache_mask) {
239 if (entrylo0 & MIPS3_PG_V) {
240 ++vcpu->stat.flush_dcache_exits;
241 flush_data_cache_page((entryhi & VPN2_MASK) &
244 if (entrylo1 & MIPS3_PG_V) {
245 ++vcpu->stat.flush_dcache_exits;
246 flush_data_cache_page(((entryhi & VPN2_MASK) &
247 ~flush_dcache_mask) |
248 (0x1 << PAGE_SHIFT));
252 /* Restore old ASID */
253 write_c0_entryhi(old_entryhi);
256 local_irq_restore(flags);
260 /* XXXKYMA: Must be called with interrupts disabled */
261 int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
262 struct kvm_vcpu *vcpu)
266 unsigned long vaddr = 0;
267 unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
269 struct kvm *kvm = vcpu->kvm;
270 const int flush_dcache_mask = 0;
272 if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
273 kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
274 kvm_mips_dump_host_tlbs();
278 gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
279 if ((gfn | 1) >= kvm->arch.guest_pmap_npages) {
280 kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
282 kvm_mips_dump_host_tlbs();
286 vaddr = badvaddr & (PAGE_MASK << 1);
288 if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
291 if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0)
295 pfn0 = kvm->arch.guest_pmap[gfn];
296 pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1];
298 pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1];
299 pfn1 = kvm->arch.guest_pmap[gfn];
302 entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu));
303 entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
304 (1 << 2) | (0x1 << 1);
305 entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
306 (1 << 2) | (0x1 << 1);
308 return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
311 EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault);
313 int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
314 struct kvm_vcpu *vcpu)
317 unsigned long flags, old_entryhi = 0, vaddr = 0;
318 unsigned long entrylo0 = 0, entrylo1 = 0;
320 pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT;
322 entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
323 (1 << 2) | (0x1 << 1);
326 local_irq_save(flags);
328 old_entryhi = read_c0_entryhi();
329 vaddr = badvaddr & (PAGE_MASK << 1);
330 write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu));
332 write_c0_entrylo0(entrylo0);
334 write_c0_entrylo1(entrylo1);
336 write_c0_index(kvm_mips_get_commpage_asid(vcpu));
342 kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n",
343 vcpu->arch.pc, read_c0_index(), read_c0_entryhi(),
344 read_c0_entrylo0(), read_c0_entrylo1());
346 /* Restore old ASID */
347 write_c0_entryhi(old_entryhi);
350 local_irq_restore(flags);
354 EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault);
356 int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
357 struct kvm_mips_tlb *tlb,
361 unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
362 struct kvm *kvm = vcpu->kvm;
367 tlb_lo[0] = tlb->tlb_lo0;
368 tlb_lo[1] = tlb->tlb_lo1;
371 * The commpage address must not be mapped to anything else if the guest
372 * TLB contains entries nearby, or commpage accesses will break.
374 if (!((tlb->tlb_hi ^ KVM_GUEST_COMMPAGE_ADDR) &
375 VPN2_MASK & (PAGE_MASK << 1)))
376 tlb_lo[(KVM_GUEST_COMMPAGE_ADDR >> PAGE_SHIFT) & 1] = 0;
378 gfn0 = mips3_tlbpfn_to_paddr(tlb_lo[0]) >> PAGE_SHIFT;
379 gfn1 = mips3_tlbpfn_to_paddr(tlb_lo[1]) >> PAGE_SHIFT;
380 if (gfn0 >= kvm->arch.guest_pmap_npages ||
381 gfn1 >= kvm->arch.guest_pmap_npages) {
382 kvm_err("%s: Invalid gfn: [%#llx, %#llx], EHi: %#lx\n",
383 __func__, gfn0, gfn1, tlb->tlb_hi);
384 kvm_mips_dump_guest_tlbs(vcpu);
388 if (kvm_mips_map_page(kvm, gfn0) < 0)
391 if (kvm_mips_map_page(kvm, gfn1) < 0)
394 pfn0 = kvm->arch.guest_pmap[gfn0];
395 pfn1 = kvm->arch.guest_pmap[gfn1];
398 *hpa0 = pfn0 << PAGE_SHIFT;
401 *hpa1 = pfn1 << PAGE_SHIFT;
403 /* Get attributes from the Guest TLB */
404 entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ?
405 kvm_mips_get_kernel_asid(vcpu) :
406 kvm_mips_get_user_asid(vcpu));
407 entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
408 (tlb_lo[0] & MIPS3_PG_D) | (tlb_lo[0] & MIPS3_PG_V);
409 entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
410 (tlb_lo[1] & MIPS3_PG_D) | (tlb_lo[1] & MIPS3_PG_V);
412 kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
413 tlb->tlb_lo0, tlb->tlb_lo1);
415 return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
418 EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault);
420 int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
424 struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb;
426 for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
427 if (TLB_HI_VPN2_HIT(tlb[i], entryhi) &&
428 TLB_HI_ASID_HIT(tlb[i], entryhi)) {
434 kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n",
435 __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1);
439 EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup);
441 int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr)
443 unsigned long old_entryhi, flags;
446 local_irq_save(flags);
448 old_entryhi = read_c0_entryhi();
450 if (KVM_GUEST_KERNEL_MODE(vcpu))
451 write_c0_entryhi((vaddr & VPN2_MASK) |
452 kvm_mips_get_kernel_asid(vcpu));
454 write_c0_entryhi((vaddr & VPN2_MASK) |
455 kvm_mips_get_user_asid(vcpu));
462 idx = read_c0_index();
464 /* Restore old ASID */
465 write_c0_entryhi(old_entryhi);
469 local_irq_restore(flags);
471 kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx);
475 EXPORT_SYMBOL(kvm_mips_host_tlb_lookup);
477 int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
480 unsigned long flags, old_entryhi;
482 local_irq_save(flags);
484 old_entryhi = read_c0_entryhi();
486 write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu));
491 idx = read_c0_index();
493 if (idx >= current_cpu_data.tlbsize)
497 write_c0_entryhi(UNIQUE_ENTRYHI(idx));
500 write_c0_entrylo0(0);
503 write_c0_entrylo1(0);
510 write_c0_entryhi(old_entryhi);
514 local_irq_restore(flags);
517 kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__,
518 (va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx);
522 EXPORT_SYMBOL(kvm_mips_host_tlb_inv);
524 /* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID */
525 int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index)
527 unsigned long flags, old_entryhi;
529 if (index >= current_cpu_data.tlbsize)
532 local_irq_save(flags);
534 old_entryhi = read_c0_entryhi();
536 write_c0_entryhi(UNIQUE_ENTRYHI(index));
539 write_c0_index(index);
542 write_c0_entrylo0(0);
545 write_c0_entrylo1(0);
552 write_c0_entryhi(old_entryhi);
556 local_irq_restore(flags);
561 void kvm_mips_flush_host_tlb(int skip_kseg0)
564 unsigned long old_entryhi, entryhi;
565 unsigned long old_pagemask;
567 int maxentry = current_cpu_data.tlbsize;
569 local_irq_save(flags);
571 old_entryhi = read_c0_entryhi();
572 old_pagemask = read_c0_pagemask();
574 /* Blast 'em all away. */
575 for (entry = 0; entry < maxentry; entry++) {
576 write_c0_index(entry);
583 entryhi = read_c0_entryhi();
585 /* Don't blow away guest kernel entries */
586 if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0)
590 /* Make sure all entries differ. */
591 write_c0_entryhi(UNIQUE_ENTRYHI(entry));
593 write_c0_entrylo0(0);
595 write_c0_entrylo1(0);
604 write_c0_entryhi(old_entryhi);
605 write_c0_pagemask(old_pagemask);
609 local_irq_restore(flags);
611 EXPORT_SYMBOL(kvm_mips_flush_host_tlb);
613 void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
614 struct kvm_vcpu *vcpu)
616 unsigned long asid = asid_cache(cpu);
619 if (!(asid & ASID_MASK)) {
620 if (cpu_has_vtag_icache)
623 kvm_local_flush_tlb_all(); /* start new asid cycle */
625 if (!asid) /* fix version if needed */
626 asid = ASID_FIRST_VERSION;
629 cpu_context(cpu, mm) = asid_cache(cpu) = asid;
632 void kvm_local_flush_tlb_all(void)
635 unsigned long old_ctx;
638 local_irq_save(flags);
639 /* Save old context and create impossible VPN2 value */
640 old_ctx = read_c0_entryhi();
641 write_c0_entrylo0(0);
642 write_c0_entrylo1(0);
644 /* Blast 'em all away. */
645 while (entry < current_cpu_data.tlbsize) {
646 /* Make sure all entries differ. */
647 write_c0_entryhi(UNIQUE_ENTRYHI(entry));
648 write_c0_index(entry);
654 write_c0_entryhi(old_ctx);
657 local_irq_restore(flags);
659 EXPORT_SYMBOL(kvm_local_flush_tlb_all);
662 * kvm_mips_migrate_count() - Migrate timer.
663 * @vcpu: Virtual CPU.
665 * Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it
666 * if it was running prior to being cancelled.
668 * Must be called when the VCPU is migrated to a different CPU to ensure that
669 * timer expiry during guest execution interrupts the guest and causes the
670 * interrupt to be delivered in a timely manner.
672 static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu)
674 if (hrtimer_cancel(&vcpu->arch.comparecount_timer))
675 hrtimer_restart(&vcpu->arch.comparecount_timer);
678 /* Restore ASID once we are scheduled back after preemption */
679 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
684 kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);
686 /* Alocate new kernel and user ASIDs if needed */
688 local_irq_save(flags);
691 guest_kernel_asid[cpu] ^ asid_cache(cpu)) & ASID_VERSION_MASK)) {
692 kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu);
693 vcpu->arch.guest_kernel_asid[cpu] =
694 vcpu->arch.guest_kernel_mm.context.asid[cpu];
695 kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu);
696 vcpu->arch.guest_user_asid[cpu] =
697 vcpu->arch.guest_user_mm.context.asid[cpu];
700 kvm_debug("[%d]: cpu_context: %#lx\n", cpu,
701 cpu_context(cpu, current->mm));
702 kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n",
703 cpu, vcpu->arch.guest_kernel_asid[cpu]);
704 kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu,
705 vcpu->arch.guest_user_asid[cpu]);
708 if (vcpu->arch.last_sched_cpu != cpu) {
709 kvm_debug("[%d->%d]KVM VCPU[%d] switch\n",
710 vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
712 * Migrate the timer interrupt to the current CPU so that it
713 * always interrupts the guest and synchronously triggers a
714 * guest timer interrupt.
716 kvm_mips_migrate_count(vcpu);
721 * If we preempted while the guest was executing, then reload
722 * the pre-empted ASID
724 if (current->flags & PF_VCPU) {
725 write_c0_entryhi(vcpu->arch.
726 preempt_entryhi & ASID_MASK);
730 /* New ASIDs were allocated for the VM */
733 * Were we in guest context? If so then the pre-empted ASID is
734 * no longer valid, we need to set it to what it should be based
735 * on the mode of the Guest (Kernel/User)
737 if (current->flags & PF_VCPU) {
738 if (KVM_GUEST_KERNEL_MODE(vcpu))
739 write_c0_entryhi(vcpu->arch.
740 guest_kernel_asid[cpu] &
743 write_c0_entryhi(vcpu->arch.
744 guest_user_asid[cpu] &
750 /* restore guest state to registers */
751 kvm_mips_callbacks->vcpu_set_regs(vcpu);
753 local_irq_restore(flags);
756 EXPORT_SYMBOL(kvm_arch_vcpu_load);
758 /* ASID can change if another task is scheduled during preemption */
759 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
764 local_irq_save(flags);
766 cpu = smp_processor_id();
768 vcpu->arch.preempt_entryhi = read_c0_entryhi();
769 vcpu->arch.last_sched_cpu = cpu;
771 /* save guest state in registers */
772 kvm_mips_callbacks->vcpu_get_regs(vcpu);
774 if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
775 ASID_VERSION_MASK)) {
776 kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__,
777 cpu_context(cpu, current->mm));
778 drop_mmu_context(current->mm, cpu);
780 write_c0_entryhi(cpu_asid(cpu, current->mm));
783 local_irq_restore(flags);
785 EXPORT_SYMBOL(kvm_arch_vcpu_put);
787 uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu)
789 struct mips_coproc *cop0 = vcpu->arch.cop0;
790 unsigned long paddr, flags, vpn2, asid;
794 if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 ||
795 KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
796 local_irq_save(flags);
797 index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc);
801 vpn2 = (unsigned long) opc & VPN2_MASK;
802 asid = kvm_read_c0_guest_entryhi(cop0) & ASID_MASK;
803 index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid);
805 kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n",
806 __func__, opc, vcpu, read_c0_entryhi());
807 kvm_mips_dump_host_tlbs();
808 local_irq_restore(flags);
809 return KVM_INVALID_INST;
811 if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
812 &vcpu->arch.guest_tlb[index],
814 kvm_err("%s: handling mapped seg tlb fault failed for %p, index: %u, vcpu: %p, ASID: %#lx\n",
815 __func__, opc, index, vcpu,
817 kvm_mips_dump_guest_tlbs(vcpu);
818 local_irq_restore(flags);
819 return KVM_INVALID_INST;
823 local_irq_restore(flags);
824 } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
826 kvm_mips_translate_guest_kseg0_to_hpa(vcpu,
827 (unsigned long) opc);
828 inst = *(uint32_t *) CKSEG0ADDR(paddr);
830 kvm_err("%s: illegal address: %p\n", __func__, opc);
831 return KVM_INVALID_INST;
836 EXPORT_SYMBOL(kvm_get_inst);