| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * KVM/MIPS TLB handling, this file is part of the Linux host kernel so that |
| * TLB handlers run from KSEG0 |
| * |
| * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. |
| * Authors: Sanjay Lal <sanjayl@kymasys.com> |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/smp.h> |
| #include <linux/mm.h> |
| #include <linux/delay.h> |
| #include <linux/module.h> |
| #include <linux/kvm_host.h> |
| #include <linux/srcu.h> |
| |
| #include <asm/cpu.h> |
| #include <asm/bootinfo.h> |
| #include <asm/mmu_context.h> |
| #include <asm/pgtable.h> |
| #include <asm/cacheflush.h> |
| #include <asm/tlb.h> |
| |
| #undef CONFIG_MIPS_MT |
| #include <asm/r4kcache.h> |
| #define CONFIG_MIPS_MT |
| |
| #define KVM_GUEST_PC_TLB 0 |
| #define KVM_GUEST_SP_TLB 1 |
| |
| #define PRIx64 "llx" |
| |
| atomic_t kvm_mips_instance; |
| EXPORT_SYMBOL_GPL(kvm_mips_instance); |
| |
| /* These function pointers are initialized once the KVM module is loaded */ |
| kvm_pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn); |
| EXPORT_SYMBOL_GPL(kvm_mips_gfn_to_pfn); |
| |
| void (*kvm_mips_release_pfn_clean)(kvm_pfn_t pfn); |
| EXPORT_SYMBOL_GPL(kvm_mips_release_pfn_clean); |
| |
| bool (*kvm_mips_is_error_pfn)(kvm_pfn_t pfn); |
| EXPORT_SYMBOL_GPL(kvm_mips_is_error_pfn); |
| |
| uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK; |
| } |
| |
| uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK; |
| } |
| |
| inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->kvm->arch.commpage_tlb; |
| } |
| |
| /* Structure defining an tlb entry data set. */ |
| |
| void kvm_mips_dump_host_tlbs(void) |
| { |
| unsigned long old_entryhi; |
| unsigned long old_pagemask; |
| struct kvm_mips_tlb tlb; |
| unsigned long flags; |
| int i; |
| |
| local_irq_save(flags); |
| |
| old_entryhi = read_c0_entryhi(); |
| old_pagemask = read_c0_pagemask(); |
| |
| kvm_info("HOST TLBs:\n"); |
| kvm_info("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK); |
| |
| for (i = 0; i < current_cpu_data.tlbsize; i++) { |
| write_c0_index(i); |
| mtc0_tlbw_hazard(); |
| |
| tlb_read(); |
| tlbw_use_hazard(); |
| |
| tlb.tlb_hi = read_c0_entryhi(); |
| tlb.tlb_lo0 = read_c0_entrylo0(); |
| tlb.tlb_lo1 = read_c0_entrylo1(); |
| tlb.tlb_mask = read_c0_pagemask(); |
| |
| kvm_info("TLB%c%3d Hi 0x%08lx ", |
| (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', |
| i, tlb.tlb_hi); |
| kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", |
| (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), |
| (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', |
| (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', |
| (tlb.tlb_lo0 >> 3) & 7); |
| kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", |
| (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), |
| (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', |
| (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', |
| (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); |
| } |
| write_c0_entryhi(old_entryhi); |
| write_c0_pagemask(old_pagemask); |
| mtc0_tlbw_hazard(); |
| local_irq_restore(flags); |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_dump_host_tlbs); |
| |
| void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) |
| { |
| struct mips_coproc *cop0 = vcpu->arch.cop0; |
| struct kvm_mips_tlb tlb; |
| int i; |
| |
| kvm_info("Guest TLBs:\n"); |
| kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0)); |
| |
| for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { |
| tlb = vcpu->arch.guest_tlb[i]; |
| kvm_info("TLB%c%3d Hi 0x%08lx ", |
| (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', |
| i, tlb.tlb_hi); |
| kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", |
| (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), |
| (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', |
| (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', |
| (tlb.tlb_lo0 >> 3) & 7); |
| kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", |
| (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), |
| (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', |
| (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', |
| (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); |
| } |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_dump_guest_tlbs); |
| |
| static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn) |
| { |
| int srcu_idx, err = 0; |
| kvm_pfn_t pfn; |
| |
| if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE) |
| return 0; |
| |
| srcu_idx = srcu_read_lock(&kvm->srcu); |
| pfn = kvm_mips_gfn_to_pfn(kvm, gfn); |
| |
| if (kvm_mips_is_error_pfn(pfn)) { |
| kvm_err("Couldn't get pfn for gfn %#" PRIx64 "!\n", gfn); |
| err = -EFAULT; |
| goto out; |
| } |
| |
| kvm->arch.guest_pmap[gfn] = pfn; |
| out: |
| srcu_read_unlock(&kvm->srcu, srcu_idx); |
| return err; |
| } |
| |
| /* Translate guest KSEG0 addresses to Host PA */ |
| unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu, |
| unsigned long gva) |
| { |
| gfn_t gfn; |
| uint32_t offset = gva & ~PAGE_MASK; |
| struct kvm *kvm = vcpu->kvm; |
| |
| if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) { |
| kvm_err("%s/%p: Invalid gva: %#lx\n", __func__, |
| __builtin_return_address(0), gva); |
| return KVM_INVALID_PAGE; |
| } |
| |
| gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT); |
| |
| if (gfn >= kvm->arch.guest_pmap_npages) { |
| kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn, |
| gva); |
| return KVM_INVALID_PAGE; |
| } |
| |
| if (kvm_mips_map_page(vcpu->kvm, gfn) < 0) |
| return KVM_INVALID_ADDR; |
| |
| return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset; |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_translate_guest_kseg0_to_hpa); |
| |
| /* XXXKYMA: Must be called with interrupts disabled */ |
| /* set flush_dcache_mask == 0 if no dcache flush required */ |
| int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, |
| unsigned long entrylo0, unsigned long entrylo1, |
| int flush_dcache_mask) |
| { |
| unsigned long flags; |
| unsigned long old_entryhi; |
| int idx; |
| |
| local_irq_save(flags); |
| |
| old_entryhi = read_c0_entryhi(); |
| write_c0_entryhi(entryhi); |
| mtc0_tlbw_hazard(); |
| |
| tlb_probe(); |
| tlb_probe_hazard(); |
| idx = read_c0_index(); |
| |
| if (idx > current_cpu_data.tlbsize) { |
| kvm_err("%s: Invalid Index: %d\n", __func__, idx); |
| kvm_mips_dump_host_tlbs(); |
| local_irq_restore(flags); |
| return -1; |
| } |
| |
| write_c0_entrylo0(entrylo0); |
| write_c0_entrylo1(entrylo1); |
| mtc0_tlbw_hazard(); |
| |
| if (idx < 0) |
| tlb_write_random(); |
| else |
| tlb_write_indexed(); |
| tlbw_use_hazard(); |
| |
| kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n", |
| vcpu->arch.pc, idx, read_c0_entryhi(), |
| read_c0_entrylo0(), read_c0_entrylo1()); |
| |
| /* Flush D-cache */ |
| if (flush_dcache_mask) { |
| if (entrylo0 & MIPS3_PG_V) { |
| ++vcpu->stat.flush_dcache_exits; |
| flush_data_cache_page((entryhi & VPN2_MASK) & |
| ~flush_dcache_mask); |
| } |
| if (entrylo1 & MIPS3_PG_V) { |
| ++vcpu->stat.flush_dcache_exits; |
| flush_data_cache_page(((entryhi & VPN2_MASK) & |
| ~flush_dcache_mask) | |
| (0x1 << PAGE_SHIFT)); |
| } |
| } |
| |
| /* Restore old ASID */ |
| write_c0_entryhi(old_entryhi); |
| mtc0_tlbw_hazard(); |
| tlbw_use_hazard(); |
| local_irq_restore(flags); |
| return 0; |
| } |
| |
| /* XXXKYMA: Must be called with interrupts disabled */ |
| int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr, |
| struct kvm_vcpu *vcpu) |
| { |
| gfn_t gfn; |
| kvm_pfn_t pfn0, pfn1; |
| unsigned long vaddr = 0; |
| unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; |
| int even; |
| struct kvm *kvm = vcpu->kvm; |
| const int flush_dcache_mask = 0; |
| |
| if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) { |
| kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr); |
| kvm_mips_dump_host_tlbs(); |
| return -1; |
| } |
| |
| gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT); |
| if (gfn >= kvm->arch.guest_pmap_npages) { |
| kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__, |
| gfn, badvaddr); |
| kvm_mips_dump_host_tlbs(); |
| return -1; |
| } |
| even = !(gfn & 0x1); |
| vaddr = badvaddr & (PAGE_MASK << 1); |
| |
| if (kvm_mips_map_page(vcpu->kvm, gfn) < 0) |
| return -1; |
| |
| if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0) |
| return -1; |
| |
| if (even) { |
| pfn0 = kvm->arch.guest_pmap[gfn]; |
| pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1]; |
| } else { |
| pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1]; |
| pfn1 = kvm->arch.guest_pmap[gfn]; |
| } |
| |
| entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu)); |
| entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | |
| (1 << 2) | (0x1 << 1); |
| entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | |
| (1 << 2) | (0x1 << 1); |
| |
| return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, |
| flush_dcache_mask); |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_handle_kseg0_tlb_fault); |
| |
| int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, |
| struct kvm_vcpu *vcpu) |
| { |
| kvm_pfn_t pfn0, pfn1; |
| unsigned long flags, old_entryhi = 0, vaddr = 0; |
| unsigned long entrylo0 = 0, entrylo1 = 0; |
| |
| pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; |
| pfn1 = 0; |
| entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | |
| (1 << 2) | (0x1 << 1); |
| entrylo1 = 0; |
| |
| local_irq_save(flags); |
| |
| old_entryhi = read_c0_entryhi(); |
| vaddr = badvaddr & (PAGE_MASK << 1); |
| write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu)); |
| mtc0_tlbw_hazard(); |
| write_c0_entrylo0(entrylo0); |
| mtc0_tlbw_hazard(); |
| write_c0_entrylo1(entrylo1); |
| mtc0_tlbw_hazard(); |
| write_c0_index(kvm_mips_get_commpage_asid(vcpu)); |
| mtc0_tlbw_hazard(); |
| tlb_write_indexed(); |
| mtc0_tlbw_hazard(); |
| tlbw_use_hazard(); |
| |
| kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n", |
| vcpu->arch.pc, read_c0_index(), read_c0_entryhi(), |
| read_c0_entrylo0(), read_c0_entrylo1()); |
| |
| /* Restore old ASID */ |
| write_c0_entryhi(old_entryhi); |
| mtc0_tlbw_hazard(); |
| tlbw_use_hazard(); |
| local_irq_restore(flags); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_handle_commpage_tlb_fault); |
| |
| int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu, |
| struct kvm_mips_tlb *tlb, |
| unsigned long *hpa0, |
| unsigned long *hpa1) |
| { |
| unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; |
| struct kvm *kvm = vcpu->kvm; |
| kvm_pfn_t pfn0, pfn1; |
| |
| if ((tlb->tlb_hi & VPN2_MASK) == 0) { |
| pfn0 = 0; |
| pfn1 = 0; |
| } else { |
| if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0) |
| >> PAGE_SHIFT) < 0) |
| return -1; |
| |
| if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1) |
| >> PAGE_SHIFT) < 0) |
| return -1; |
| |
| pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0) |
| >> PAGE_SHIFT]; |
| pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1) |
| >> PAGE_SHIFT]; |
| } |
| |
| if (hpa0) |
| *hpa0 = pfn0 << PAGE_SHIFT; |
| |
| if (hpa1) |
| *hpa1 = pfn1 << PAGE_SHIFT; |
| |
| /* Get attributes from the Guest TLB */ |
| entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ? |
| kvm_mips_get_kernel_asid(vcpu) : |
| kvm_mips_get_user_asid(vcpu)); |
| entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | |
| (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V); |
| entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | |
| (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V); |
| |
| kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc, |
| tlb->tlb_lo0, tlb->tlb_lo1); |
| |
| return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, |
| tlb->tlb_mask); |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_handle_mapped_seg_tlb_fault); |
| |
| int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) |
| { |
| int i; |
| int index = -1; |
| struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb; |
| |
| for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { |
| if (TLB_HI_VPN2_HIT(tlb[i], entryhi) && |
| TLB_HI_ASID_HIT(tlb[i], entryhi)) { |
| index = i; |
| break; |
| } |
| } |
| |
| kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n", |
| __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1); |
| |
| return index; |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_guest_tlb_lookup); |
| |
| int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) |
| { |
| unsigned long old_entryhi, flags; |
| int idx; |
| |
| local_irq_save(flags); |
| |
| old_entryhi = read_c0_entryhi(); |
| |
| if (KVM_GUEST_KERNEL_MODE(vcpu)) |
| write_c0_entryhi((vaddr & VPN2_MASK) | |
| kvm_mips_get_kernel_asid(vcpu)); |
| else { |
| write_c0_entryhi((vaddr & VPN2_MASK) | |
| kvm_mips_get_user_asid(vcpu)); |
| } |
| |
| mtc0_tlbw_hazard(); |
| |
| tlb_probe(); |
| tlb_probe_hazard(); |
| idx = read_c0_index(); |
| |
| /* Restore old ASID */ |
| write_c0_entryhi(old_entryhi); |
| mtc0_tlbw_hazard(); |
| tlbw_use_hazard(); |
| |
| local_irq_restore(flags); |
| |
| kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx); |
| |
| return idx; |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_lookup); |
| |
| int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) |
| { |
| int idx; |
| unsigned long flags, old_entryhi; |
| |
| local_irq_save(flags); |
| |
| old_entryhi = read_c0_entryhi(); |
| |
| write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu)); |
| mtc0_tlbw_hazard(); |
| |
| tlb_probe(); |
| tlb_probe_hazard(); |
| idx = read_c0_index(); |
| |
| if (idx >= current_cpu_data.tlbsize) |
| BUG(); |
| |
| if (idx > 0) { |
| write_c0_entryhi(UNIQUE_ENTRYHI(idx)); |
| mtc0_tlbw_hazard(); |
| |
| write_c0_entrylo0(0); |
| mtc0_tlbw_hazard(); |
| |
| write_c0_entrylo1(0); |
| mtc0_tlbw_hazard(); |
| |
| tlb_write_indexed(); |
| mtc0_tlbw_hazard(); |
| } |
| |
| write_c0_entryhi(old_entryhi); |
| mtc0_tlbw_hazard(); |
| tlbw_use_hazard(); |
| |
| local_irq_restore(flags); |
| |
| if (idx > 0) |
| kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__, |
| (va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_inv); |
| |
| void kvm_mips_flush_host_tlb(int skip_kseg0) |
| { |
| unsigned long flags; |
| unsigned long old_entryhi, entryhi; |
| unsigned long old_pagemask; |
| int entry = 0; |
| int maxentry = current_cpu_data.tlbsize; |
| |
| local_irq_save(flags); |
| |
| old_entryhi = read_c0_entryhi(); |
| old_pagemask = read_c0_pagemask(); |
| |
| /* Blast 'em all away. */ |
| for (entry = 0; entry < maxentry; entry++) { |
| write_c0_index(entry); |
| mtc0_tlbw_hazard(); |
| |
| if (skip_kseg0) { |
| tlb_read(); |
| tlbw_use_hazard(); |
| |
| entryhi = read_c0_entryhi(); |
| |
| /* Don't blow away guest kernel entries */ |
| if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) |
| continue; |
| } |
| |
| /* Make sure all entries differ. */ |
| write_c0_entryhi(UNIQUE_ENTRYHI(entry)); |
| mtc0_tlbw_hazard(); |
| write_c0_entrylo0(0); |
| mtc0_tlbw_hazard(); |
| write_c0_entrylo1(0); |
| mtc0_tlbw_hazard(); |
| |
| tlb_write_indexed(); |
| mtc0_tlbw_hazard(); |
| } |
| |
| tlbw_use_hazard(); |
| |
| write_c0_entryhi(old_entryhi); |
| write_c0_pagemask(old_pagemask); |
| mtc0_tlbw_hazard(); |
| tlbw_use_hazard(); |
| |
| local_irq_restore(flags); |
| } |
| EXPORT_SYMBOL_GPL(kvm_mips_flush_host_tlb); |
| |
| void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu, |
| struct kvm_vcpu *vcpu) |
| { |
| unsigned long asid = asid_cache(cpu); |
| |
| asid += ASID_INC; |
| if (!(asid & ASID_MASK)) { |
| if (cpu_has_vtag_icache) |
| flush_icache_all(); |
| |
| kvm_local_flush_tlb_all(); /* start new asid cycle */ |
| |
| if (!asid) /* fix version if needed */ |
| asid = ASID_FIRST_VERSION; |
| } |
| |
| cpu_context(cpu, mm) = asid_cache(cpu) = asid; |
| } |
| |
| void kvm_local_flush_tlb_all(void) |
| { |
| unsigned long flags; |
| unsigned long old_ctx; |
| int entry = 0; |
| |
| local_irq_save(flags); |
| /* Save old context and create impossible VPN2 value */ |
| old_ctx = read_c0_entryhi(); |
| write_c0_entrylo0(0); |
| write_c0_entrylo1(0); |
| |
| /* Blast 'em all away. */ |
| while (entry < current_cpu_data.tlbsize) { |
| /* Make sure all entries differ. */ |
| write_c0_entryhi(UNIQUE_ENTRYHI(entry)); |
| write_c0_index(entry); |
| mtc0_tlbw_hazard(); |
| tlb_write_indexed(); |
| entry++; |
| } |
| tlbw_use_hazard(); |
| write_c0_entryhi(old_ctx); |
| mtc0_tlbw_hazard(); |
| |
| local_irq_restore(flags); |
| } |
| EXPORT_SYMBOL_GPL(kvm_local_flush_tlb_all); |
| |
| /** |
| * kvm_mips_migrate_count() - Migrate timer. |
| * @vcpu: Virtual CPU. |
| * |
| * Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it |
| * if it was running prior to being cancelled. |
| * |
| * Must be called when the VCPU is migrated to a different CPU to ensure that |
| * timer expiry during guest execution interrupts the guest and causes the |
| * interrupt to be delivered in a timely manner. |
| */ |
| static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu) |
| { |
| if (hrtimer_cancel(&vcpu->arch.comparecount_timer)) |
| hrtimer_restart(&vcpu->arch.comparecount_timer); |
| } |
| |
| /* Restore ASID once we are scheduled back after preemption */ |
| void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
| { |
| unsigned long flags; |
| int newasid = 0; |
| |
| kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu); |
| |
| /* Allocate new kernel and user ASIDs if needed */ |
| |
| local_irq_save(flags); |
| |
| if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) & |
| ASID_VERSION_MASK) { |
| kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu); |
| vcpu->arch.guest_kernel_asid[cpu] = |
| vcpu->arch.guest_kernel_mm.context.asid[cpu]; |
| kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu); |
| vcpu->arch.guest_user_asid[cpu] = |
| vcpu->arch.guest_user_mm.context.asid[cpu]; |
| newasid++; |
| |
| kvm_debug("[%d]: cpu_context: %#lx\n", cpu, |
| cpu_context(cpu, current->mm)); |
| kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n", |
| cpu, vcpu->arch.guest_kernel_asid[cpu]); |
| kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu, |
| vcpu->arch.guest_user_asid[cpu]); |
| } |
| |
| if (vcpu->arch.last_sched_cpu != cpu) { |
| kvm_debug("[%d->%d]KVM VCPU[%d] switch\n", |
| vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id); |
| /* |
| * Migrate the timer interrupt to the current CPU so that it |
| * always interrupts the guest and synchronously triggers a |
| * guest timer interrupt. |
| */ |
| kvm_mips_migrate_count(vcpu); |
| } |
| |
| if (!newasid) { |
| /* |
| * If we preempted while the guest was executing, then reload |
| * the pre-empted ASID |
| */ |
| if (current->flags & PF_VCPU) { |
| write_c0_entryhi(vcpu->arch. |
| preempt_entryhi & ASID_MASK); |
| ehb(); |
| } |
| } else { |
| /* New ASIDs were allocated for the VM */ |
| |
| /* |
| * Were we in guest context? If so then the pre-empted ASID is |
| * no longer valid, we need to set it to what it should be based |
| * on the mode of the Guest (Kernel/User) |
| */ |
| if (current->flags & PF_VCPU) { |
| if (KVM_GUEST_KERNEL_MODE(vcpu)) |
| write_c0_entryhi(vcpu->arch. |
| guest_kernel_asid[cpu] & |
| ASID_MASK); |
| else |
| write_c0_entryhi(vcpu->arch. |
| guest_user_asid[cpu] & |
| ASID_MASK); |
| ehb(); |
| } |
| } |
| |
| /* restore guest state to registers */ |
| kvm_mips_callbacks->vcpu_set_regs(vcpu); |
| |
| local_irq_restore(flags); |
| |
| } |
| EXPORT_SYMBOL_GPL(kvm_arch_vcpu_load); |
| |
| /* ASID can change if another task is scheduled during preemption */ |
| void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) |
| { |
| unsigned long flags; |
| uint32_t cpu; |
| |
| local_irq_save(flags); |
| |
| cpu = smp_processor_id(); |
| |
| vcpu->arch.preempt_entryhi = read_c0_entryhi(); |
| vcpu->arch.last_sched_cpu = cpu; |
| |
| /* save guest state in registers */ |
| kvm_mips_callbacks->vcpu_get_regs(vcpu); |
| |
| if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & |
| ASID_VERSION_MASK)) { |
| kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__, |
| cpu_context(cpu, current->mm)); |
| drop_mmu_context(current->mm, cpu); |
| } |
| write_c0_entryhi(cpu_asid(cpu, current->mm)); |
| ehb(); |
| |
| local_irq_restore(flags); |
| } |
| EXPORT_SYMBOL_GPL(kvm_arch_vcpu_put); |
| |
| uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu) |
| { |
| struct mips_coproc *cop0 = vcpu->arch.cop0; |
| unsigned long paddr, flags, vpn2, asid; |
| uint32_t inst; |
| int index; |
| |
| if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 || |
| KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) { |
| local_irq_save(flags); |
| index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc); |
| if (index >= 0) { |
| inst = *(opc); |
| } else { |
| vpn2 = (unsigned long) opc & VPN2_MASK; |
| asid = kvm_read_c0_guest_entryhi(cop0) & ASID_MASK; |
| index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid); |
| if (index < 0) { |
| kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n", |
| __func__, opc, vcpu, read_c0_entryhi()); |
| kvm_mips_dump_host_tlbs(); |
| local_irq_restore(flags); |
| return KVM_INVALID_INST; |
| } |
| kvm_mips_handle_mapped_seg_tlb_fault(vcpu, |
| &vcpu->arch. |
| guest_tlb[index], |
| NULL, NULL); |
| inst = *(opc); |
| } |
| local_irq_restore(flags); |
| } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { |
| paddr = |
| kvm_mips_translate_guest_kseg0_to_hpa(vcpu, |
| (unsigned long) opc); |
| inst = *(uint32_t *) CKSEG0ADDR(paddr); |
| } else { |
| kvm_err("%s: illegal address: %p\n", __func__, opc); |
| return KVM_INVALID_INST; |
| } |
| |
| return inst; |
| } |
| EXPORT_SYMBOL_GPL(kvm_get_inst); |