MIPS: Remove KVM_TE support

After removal of the guest part of KVM TE (trap and emulate), also remove
the host part.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

1 files changed, 0 insertions, 405 deletions

diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 3dabeda82458..190ca2451851 100644
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -756,209 +756,6 @@ out:
 	return err;
 }
 
-static pte_t *kvm_trap_emul_pte_for_gva(struct kvm_vcpu *vcpu,
-					unsigned long addr)
-{
-	struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
-	pgd_t *pgdp;
-	int ret;
-
-	/* We need a minimum of cached pages ready for page table creation */
-	ret = kvm_mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES);
-	if (ret)
-		return NULL;
-
-	if (KVM_GUEST_KERNEL_MODE(vcpu))
-		pgdp = vcpu->arch.guest_kernel_mm.pgd;
-	else
-		pgdp = vcpu->arch.guest_user_mm.pgd;
-
-	return kvm_mips_walk_pgd(pgdp, memcache, addr);
-}
-
-void kvm_trap_emul_invalidate_gva(struct kvm_vcpu *vcpu, unsigned long addr,
-				  bool user)
-{
-	pgd_t *pgdp;
-	pte_t *ptep;
-
-	addr &= PAGE_MASK << 1;
-
-	pgdp = vcpu->arch.guest_kernel_mm.pgd;
-	ptep = kvm_mips_walk_pgd(pgdp, NULL, addr);
-	if (ptep) {
-		ptep[0] = pfn_pte(0, __pgprot(0));
-		ptep[1] = pfn_pte(0, __pgprot(0));
-	}
-
-	if (user) {
-		pgdp = vcpu->arch.guest_user_mm.pgd;
-		ptep = kvm_mips_walk_pgd(pgdp, NULL, addr);
-		if (ptep) {
-			ptep[0] = pfn_pte(0, __pgprot(0));
-			ptep[1] = pfn_pte(0, __pgprot(0));
-		}
-	}
-}
-
-/*
- * kvm_mips_flush_gva_{pte,pmd,pud,pgd,pt}.
- * Flush a range of guest physical address space from the VM's GPA page tables.
- */
-
-static bool kvm_mips_flush_gva_pte(pte_t *pte, unsigned long start_gva,
-				   unsigned long end_gva)
-{
-	int i_min = pte_index(start_gva);
-	int i_max = pte_index(end_gva);
-	bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PTE - 1);
-	int i;
-
-	/*
-	 * There's no freeing to do, so there's no point clearing individual
-	 * entries unless only part of the last level page table needs flushing.
-	 */
-	if (safe_to_remove)
-		return true;
-
-	for (i = i_min; i <= i_max; ++i) {
-		if (!pte_present(pte[i]))
-			continue;
-
-		set_pte(pte + i, __pte(0));
-	}
-	return false;
-}
-
-static bool kvm_mips_flush_gva_pmd(pmd_t *pmd, unsigned long start_gva,
-				   unsigned long end_gva)
-{
-	pte_t *pte;
-	unsigned long end = ~0ul;
-	int i_min = pmd_index(start_gva);
-	int i_max = pmd_index(end_gva);
-	bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PMD - 1);
-	int i;
-
-	for (i = i_min; i <= i_max; ++i, start_gva = 0) {
-		if (!pmd_present(pmd[i]))
-			continue;
-
-		pte = pte_offset_kernel(pmd + i, 0);
-		if (i == i_max)
-			end = end_gva;
-
-		if (kvm_mips_flush_gva_pte(pte, start_gva, end)) {
-			pmd_clear(pmd + i);
-			pte_free_kernel(NULL, pte);
-		} else {
-			safe_to_remove = false;
-		}
-	}
-	return safe_to_remove;
-}
-
-static bool kvm_mips_flush_gva_pud(pud_t *pud, unsigned long start_gva,
-				   unsigned long end_gva)
-{
-	pmd_t *pmd;
-	unsigned long end = ~0ul;
-	int i_min = pud_index(start_gva);
-	int i_max = pud_index(end_gva);
-	bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PUD - 1);
-	int i;
-
-	for (i = i_min; i <= i_max; ++i, start_gva = 0) {
-		if (!pud_present(pud[i]))
-			continue;
-
-		pmd = pmd_offset(pud + i, 0);
-		if (i == i_max)
-			end = end_gva;
-
-		if (kvm_mips_flush_gva_pmd(pmd, start_gva, end)) {
-			pud_clear(pud + i);
-			pmd_free(NULL, pmd);
-		} else {
-			safe_to_remove = false;
-		}
-	}
-	return safe_to_remove;
-}
-
-static bool kvm_mips_flush_gva_pgd(pgd_t *pgd, unsigned long start_gva,
-				   unsigned long end_gva)
-{
-	p4d_t *p4d;
-	pud_t *pud;
-	unsigned long end = ~0ul;
-	int i_min = pgd_index(start_gva);
-	int i_max = pgd_index(end_gva);
-	bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PGD - 1);
-	int i;
-
-	for (i = i_min; i <= i_max; ++i, start_gva = 0) {
-		if (!pgd_present(pgd[i]))
-			continue;
-
-		p4d = p4d_offset(pgd, 0);
-		pud = pud_offset(p4d + i, 0);
-		if (i == i_max)
-			end = end_gva;
-
-		if (kvm_mips_flush_gva_pud(pud, start_gva, end)) {
-			pgd_clear(pgd + i);
-			pud_free(NULL, pud);
-		} else {
-			safe_to_remove = false;
-		}
-	}
-	return safe_to_remove;
-}
-
-void kvm_mips_flush_gva_pt(pgd_t *pgd, enum kvm_mips_flush flags)
-{
-	if (flags & KMF_GPA) {
-		/* all of guest virtual address space could be affected */
-		if (flags & KMF_KERN)
-			/* useg, kseg0, seg2/3 */
-			kvm_mips_flush_gva_pgd(pgd, 0, 0x7fffffff);
-		else
-			/* useg */
-			kvm_mips_flush_gva_pgd(pgd, 0, 0x3fffffff);
-	} else {
-		/* useg */
-		kvm_mips_flush_gva_pgd(pgd, 0, 0x3fffffff);
-
-		/* kseg2/3 */
-		if (flags & KMF_KERN)
-			kvm_mips_flush_gva_pgd(pgd, 0x60000000, 0x7fffffff);
-	}
-}
-
-static pte_t kvm_mips_gpa_pte_to_gva_unmapped(pte_t pte)
-{
-	/*
-	 * Don't leak writeable but clean entries from GPA page tables. We don't
-	 * want the normal Linux tlbmod handler to handle dirtying when KVM
-	 * accesses guest memory.
-	 */
-	if (!pte_dirty(pte))
-		pte = pte_wrprotect(pte);
-
-	return pte;
-}
-
-static pte_t kvm_mips_gpa_pte_to_gva_mapped(pte_t pte, long entrylo)
-{
-	/* Guest EntryLo overrides host EntryLo */
-	if (!(entrylo & ENTRYLO_D))
-		pte = pte_mkclean(pte);
-
-	return kvm_mips_gpa_pte_to_gva_unmapped(pte);
-}
-
-#ifdef CONFIG_KVM_MIPS_VZ
 int kvm_mips_handle_vz_root_tlb_fault(unsigned long badvaddr,
 				      struct kvm_vcpu *vcpu,
 				      bool write_fault)
@@ -972,125 +769,6 @@ int kvm_mips_handle_vz_root_tlb_fault(unsigned long badvaddr,
 	/* Invalidate this entry in the TLB */
 	return kvm_vz_host_tlb_inv(vcpu, badvaddr);
 }
-#endif
-
-/* XXXKYMA: Must be called with interrupts disabled */
-int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
-				    struct kvm_vcpu *vcpu,
-				    bool write_fault)
-{
-	unsigned long gpa;
-	pte_t pte_gpa[2], *ptep_gva;
-	int idx;
-
-	if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
-		kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
-		kvm_mips_dump_host_tlbs();
-		return -1;
-	}
-
-	/* Get the GPA page table entry */
-	gpa = KVM_GUEST_CPHYSADDR(badvaddr);
-	idx = (badvaddr >> PAGE_SHIFT) & 1;
-	if (kvm_mips_map_page(vcpu, gpa, write_fault, &pte_gpa[idx],
-			      &pte_gpa[!idx]) < 0)
-		return -1;
-
-	/* Get the GVA page table entry */
-	ptep_gva = kvm_trap_emul_pte_for_gva(vcpu, badvaddr & ~PAGE_SIZE);
-	if (!ptep_gva) {
-		kvm_err("No ptep for gva %lx\n", badvaddr);
-		return -1;
-	}
-
-	/* Copy a pair of entries from GPA page table to GVA page table */
-	ptep_gva[0] = kvm_mips_gpa_pte_to_gva_unmapped(pte_gpa[0]);
-	ptep_gva[1] = kvm_mips_gpa_pte_to_gva_unmapped(pte_gpa[1]);
-
-	/* Invalidate this entry in the TLB, guest kernel ASID only */
-	kvm_mips_host_tlb_inv(vcpu, badvaddr, false, true);
-	return 0;
-}
-
-int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
-					 struct kvm_mips_tlb *tlb,
-					 unsigned long gva,
-					 bool write_fault)
-{
-	struct kvm *kvm = vcpu->kvm;
-	long tlb_lo[2];
-	pte_t pte_gpa[2], *ptep_buddy, *ptep_gva;
-	unsigned int idx = TLB_LO_IDX(*tlb, gva);
-	bool kernel = KVM_GUEST_KERNEL_MODE(vcpu);
-
-	tlb_lo[0] = tlb->tlb_lo[0];
-	tlb_lo[1] = tlb->tlb_lo[1];
-
-	/*
-	 * The commpage address must not be mapped to anything else if the guest
-	 * TLB contains entries nearby, or commpage accesses will break.
-	 */
-	if (!((gva ^ KVM_GUEST_COMMPAGE_ADDR) & VPN2_MASK & (PAGE_MASK << 1)))
-		tlb_lo[TLB_LO_IDX(*tlb, KVM_GUEST_COMMPAGE_ADDR)] = 0;
-
-	/* Get the GPA page table entry */
-	if (kvm_mips_map_page(vcpu, mips3_tlbpfn_to_paddr(tlb_lo[idx]),
-			      write_fault, &pte_gpa[idx], NULL) < 0)
-		return -1;
-
-	/* And its GVA buddy's GPA page table entry if it also exists */
-	pte_gpa[!idx] = pfn_pte(0, __pgprot(0));
-	if (tlb_lo[!idx] & ENTRYLO_V) {
-		spin_lock(&kvm->mmu_lock);
-		ptep_buddy = kvm_mips_pte_for_gpa(kvm, NULL,
-					mips3_tlbpfn_to_paddr(tlb_lo[!idx]));
-		if (ptep_buddy)
-			pte_gpa[!idx] = *ptep_buddy;
-		spin_unlock(&kvm->mmu_lock);
-	}
-
-	/* Get the GVA page table entry pair */
-	ptep_gva = kvm_trap_emul_pte_for_gva(vcpu, gva & ~PAGE_SIZE);
-	if (!ptep_gva) {
-		kvm_err("No ptep for gva %lx\n", gva);
-		return -1;
-	}
-
-	/* Copy a pair of entries from GPA page table to GVA page table */
-	ptep_gva[0] = kvm_mips_gpa_pte_to_gva_mapped(pte_gpa[0], tlb_lo[0]);
-	ptep_gva[1] = kvm_mips_gpa_pte_to_gva_mapped(pte_gpa[1], tlb_lo[1]);
-
-	/* Invalidate this entry in the TLB, current guest mode ASID only */
-	kvm_mips_host_tlb_inv(vcpu, gva, !kernel, kernel);
-
-	kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
-		  tlb->tlb_lo[0], tlb->tlb_lo[1]);
-
-	return 0;
-}
-
-int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
-				       struct kvm_vcpu *vcpu)
-{
-	kvm_pfn_t pfn;
-	pte_t *ptep;
-	pgprot_t prot;
-
-	ptep = kvm_trap_emul_pte_for_gva(vcpu, badvaddr);
-	if (!ptep) {
-		kvm_err("No ptep for commpage %lx\n", badvaddr);
-		return -1;
-	}
-
-	pfn = PFN_DOWN(virt_to_phys(vcpu->arch.kseg0_commpage));
-	/* Also set valid and dirty, so refill handler doesn't have to */
-	prot = vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED);
-	*ptep = pte_mkyoung(pte_mkdirty(pfn_pte(pfn, prot)));
-
-	/* Invalidate this entry in the TLB, guest kernel ASID only */
-	kvm_mips_host_tlb_inv(vcpu, badvaddr, false, true);
-	return 0;
-}
 
 /**
  * kvm_mips_migrate_count() - Migrate timer.
@@ -1153,86 +831,3 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 
 	local_irq_restore(flags);
 }
-
-/**
- * kvm_trap_emul_gva_fault() - Safely attempt to handle a GVA access fault.
- * @vcpu:	Virtual CPU.
- * @gva:	Guest virtual address to be accessed.
- * @write:	True if write attempted (must be dirtied and made writable).
- *
- * Safely attempt to handle a GVA fault, mapping GVA pages if necessary, and
- * dirtying the page if @write so that guest instructions can be modified.
- *
- * Returns:	KVM_MIPS_MAPPED on success.
- *		KVM_MIPS_GVA if bad guest virtual address.
- *		KVM_MIPS_GPA if bad guest physical address.
- *		KVM_MIPS_TLB if guest TLB not present.
- *		KVM_MIPS_TLBINV if guest TLB present but not valid.
- *		KVM_MIPS_TLBMOD if guest TLB read only.
- */
-enum kvm_mips_fault_result kvm_trap_emul_gva_fault(struct kvm_vcpu *vcpu,
-						   unsigned long gva,
-						   bool write)
-{
-	struct mips_coproc *cop0 = vcpu->arch.cop0;
-	struct kvm_mips_tlb *tlb;
-	int index;
-
-	if (KVM_GUEST_KSEGX(gva) == KVM_GUEST_KSEG0) {
-		if (kvm_mips_handle_kseg0_tlb_fault(gva, vcpu, write) < 0)
-			return KVM_MIPS_GPA;
-	} else if ((KVM_GUEST_KSEGX(gva) < KVM_GUEST_KSEG0) ||
-		   KVM_GUEST_KSEGX(gva) == KVM_GUEST_KSEG23) {
-		/* Address should be in the guest TLB */
-		index = kvm_mips_guest_tlb_lookup(vcpu, (gva & VPN2_MASK) |
-			  (kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID));
-		if (index < 0)
-			return KVM_MIPS_TLB;
-		tlb = &vcpu->arch.guest_tlb[index];
-
-		/* Entry should be valid, and dirty for writes */
-		if (!TLB_IS_VALID(*tlb, gva))
-			return KVM_MIPS_TLBINV;
-		if (write && !TLB_IS_DIRTY(*tlb, gva))
-			return KVM_MIPS_TLBMOD;
-
-		if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, gva, write))
-			return KVM_MIPS_GPA;
-	} else {
-		return KVM_MIPS_GVA;
-	}
-
-	return KVM_MIPS_MAPPED;
-}
-
-int kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu, u32 *out)
-{
-	int err;
-
-	if (WARN(IS_ENABLED(CONFIG_KVM_MIPS_VZ),
-		 "Expect BadInstr/BadInstrP registers to be used with VZ\n"))
-		return -EINVAL;
-
-retry:
-	kvm_trap_emul_gva_lockless_begin(vcpu);
-	err = get_user(*out, opc);
-	kvm_trap_emul_gva_lockless_end(vcpu);
-
-	if (unlikely(err)) {
-		/*
-		 * Try to handle the fault, maybe we just raced with a GVA
-		 * invalidation.
-		 */
-		err = kvm_trap_emul_gva_fault(vcpu, (unsigned long)opc,
-					      false);
-		if (unlikely(err)) {
-			kvm_err("%s: illegal address: %p\n",
-				__func__, opc);
-			return -EFAULT;
-		}
-
-		/* Hopefully it'll work now */
-		goto retry;
-	}
-	return 0;
-}