v4.19.13 snapshot.
diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
new file mode 100644
index 0000000..6a0d704
--- /dev/null
+++ b/arch/mips/kvm/trap_emul.c
@@ -0,0 +1,1329 @@
+/*
+ * 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: Deliver/Emulate exceptions to the guest kernel
+ *
+ * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
+ * Authors: Sanjay Lal <sanjayl@kymasys.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <linux/log2.h>
+#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/pgalloc.h>
+
+#include "interrupt.h"
+
+static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva)
+{
+ gpa_t gpa;
+ gva_t kseg = KSEGX(gva);
+ gva_t gkseg = KVM_GUEST_KSEGX(gva);
+
+ if ((kseg == CKSEG0) || (kseg == CKSEG1))
+ gpa = CPHYSADDR(gva);
+ else if (gkseg == KVM_GUEST_KSEG0)
+ gpa = KVM_GUEST_CPHYSADDR(gva);
+ else {
+ kvm_err("%s: cannot find GPA for GVA: %#lx\n", __func__, gva);
+ kvm_mips_dump_host_tlbs();
+ gpa = KVM_INVALID_ADDR;
+ }
+
+ kvm_debug("%s: gva %#lx, gpa: %#llx\n", __func__, gva, gpa);
+
+ return gpa;
+}
+
+static int kvm_trap_emul_no_handler(struct kvm_vcpu *vcpu)
+{
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ u32 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
+ unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
+ u32 inst = 0;
+
+ /*
+ * Fetch the instruction.
+ */
+ if (cause & CAUSEF_BD)
+ opc += 1;
+ kvm_get_badinstr(opc, vcpu, &inst);
+
+ kvm_err("Exception Code: %d not handled @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n",
+ exccode, opc, inst, badvaddr,
+ kvm_read_c0_guest_status(vcpu->arch.cop0));
+ kvm_arch_vcpu_dump_regs(vcpu);
+ vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return RESUME_HOST;
+}
+
+static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu)
+{
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) {
+ /* FPU Unusable */
+ if (!kvm_mips_guest_has_fpu(&vcpu->arch) ||
+ (kvm_read_c0_guest_status(cop0) & ST0_CU1) == 0) {
+ /*
+ * Unusable/no FPU in guest:
+ * deliver guest COP1 Unusable Exception
+ */
+ er = kvm_mips_emulate_fpu_exc(cause, opc, run, vcpu);
+ } else {
+ /* Restore FPU state */
+ kvm_own_fpu(vcpu);
+ er = EMULATE_DONE;
+ }
+ } else {
+ er = kvm_mips_emulate_inst(cause, opc, run, vcpu);
+ }
+
+ switch (er) {
+ case EMULATE_DONE:
+ ret = RESUME_GUEST;
+ break;
+
+ case EMULATE_FAIL:
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ break;
+
+ case EMULATE_WAIT:
+ run->exit_reason = KVM_EXIT_INTR;
+ ret = RESUME_HOST;
+ break;
+
+ case EMULATE_HYPERCALL:
+ ret = kvm_mips_handle_hypcall(vcpu);
+ break;
+
+ default:
+ BUG();
+ }
+ return ret;
+}
+
+static int kvm_mips_bad_load(u32 cause, u32 *opc, struct kvm_run *run,
+ struct kvm_vcpu *vcpu)
+{
+ enum emulation_result er;
+ union mips_instruction inst;
+ int err;
+
+ /* A code fetch fault doesn't count as an MMIO */
+ if (kvm_is_ifetch_fault(&vcpu->arch)) {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return RESUME_HOST;
+ }
+
+ /* Fetch the instruction. */
+ if (cause & CAUSEF_BD)
+ opc += 1;
+ err = kvm_get_badinstr(opc, vcpu, &inst.word);
+ if (err) {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return RESUME_HOST;
+ }
+
+ /* Emulate the load */
+ er = kvm_mips_emulate_load(inst, cause, run, vcpu);
+ if (er == EMULATE_FAIL) {
+ kvm_err("Emulate load from MMIO space failed\n");
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ } else {
+ run->exit_reason = KVM_EXIT_MMIO;
+ }
+ return RESUME_HOST;
+}
+
+static int kvm_mips_bad_store(u32 cause, u32 *opc, struct kvm_run *run,
+ struct kvm_vcpu *vcpu)
+{
+ enum emulation_result er;
+ union mips_instruction inst;
+ int err;
+
+ /* Fetch the instruction. */
+ if (cause & CAUSEF_BD)
+ opc += 1;
+ err = kvm_get_badinstr(opc, vcpu, &inst.word);
+ if (err) {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return RESUME_HOST;
+ }
+
+ /* Emulate the store */
+ er = kvm_mips_emulate_store(inst, cause, run, vcpu);
+ if (er == EMULATE_FAIL) {
+ kvm_err("Emulate store to MMIO space failed\n");
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ } else {
+ run->exit_reason = KVM_EXIT_MMIO;
+ }
+ return RESUME_HOST;
+}
+
+static int kvm_mips_bad_access(u32 cause, u32 *opc, struct kvm_run *run,
+ struct kvm_vcpu *vcpu, bool store)
+{
+ if (store)
+ return kvm_mips_bad_store(cause, opc, run, vcpu);
+ else
+ return kvm_mips_bad_load(cause, opc, run, vcpu);
+}
+
+static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu)
+{
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ struct kvm_mips_tlb *tlb;
+ unsigned long entryhi;
+ int index;
+
+ if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0
+ || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) {
+ /*
+ * First find the mapping in the guest TLB. If the failure to
+ * write was due to the guest TLB, it should be up to the guest
+ * to handle it.
+ */
+ entryhi = (badvaddr & VPN2_MASK) |
+ (kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID);
+ index = kvm_mips_guest_tlb_lookup(vcpu, entryhi);
+
+ /*
+ * These should never happen.
+ * They would indicate stale host TLB entries.
+ */
+ if (unlikely(index < 0)) {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return RESUME_HOST;
+ }
+ tlb = vcpu->arch.guest_tlb + index;
+ if (unlikely(!TLB_IS_VALID(*tlb, badvaddr))) {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return RESUME_HOST;
+ }
+
+ /*
+ * Guest entry not dirty? That would explain the TLB modified
+ * exception. Relay that on to the guest so it can handle it.
+ */
+ if (!TLB_IS_DIRTY(*tlb, badvaddr)) {
+ kvm_mips_emulate_tlbmod(cause, opc, run, vcpu);
+ return RESUME_GUEST;
+ }
+
+ if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, badvaddr,
+ true))
+ /* Not writable, needs handling as MMIO */
+ return kvm_mips_bad_store(cause, opc, run, vcpu);
+ return RESUME_GUEST;
+ } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) {
+ if (kvm_mips_handle_kseg0_tlb_fault(badvaddr, vcpu, true) < 0)
+ /* Not writable, needs handling as MMIO */
+ return kvm_mips_bad_store(cause, opc, run, vcpu);
+ return RESUME_GUEST;
+ } else {
+ /* host kernel addresses are all handled as MMIO */
+ return kvm_mips_bad_store(cause, opc, run, vcpu);
+ }
+}
+
+static int kvm_trap_emul_handle_tlb_miss(struct kvm_vcpu *vcpu, bool store)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ if (((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR)
+ && KVM_GUEST_KERNEL_MODE(vcpu)) {
+ if (kvm_mips_handle_commpage_tlb_fault(badvaddr, vcpu) < 0) {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ } else if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0
+ || KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) {
+ kvm_debug("USER ADDR TLB %s fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
+ store ? "ST" : "LD", cause, opc, badvaddr);
+
+ /*
+ * User Address (UA) fault, this could happen if
+ * (1) TLB entry not present/valid in both Guest and shadow host
+ * TLBs, in this case we pass on the fault to the guest
+ * kernel and let it handle it.
+ * (2) TLB entry is present in the Guest TLB but not in the
+ * shadow, in this case we inject the TLB from the Guest TLB
+ * into the shadow host TLB
+ */
+
+ er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu, store);
+ if (er == EMULATE_DONE)
+ ret = RESUME_GUEST;
+ else {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ } else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) {
+ /*
+ * All KSEG0 faults are handled by KVM, as the guest kernel does
+ * not expect to ever get them
+ */
+ if (kvm_mips_handle_kseg0_tlb_fault(badvaddr, vcpu, store) < 0)
+ ret = kvm_mips_bad_access(cause, opc, run, vcpu, store);
+ } else if (KVM_GUEST_KERNEL_MODE(vcpu)
+ && (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) {
+ /*
+ * With EVA we may get a TLB exception instead of an address
+ * error when the guest performs MMIO to KSeg1 addresses.
+ */
+ ret = kvm_mips_bad_access(cause, opc, run, vcpu, store);
+ } else {
+ kvm_err("Illegal TLB %s fault address , cause %#x, PC: %p, BadVaddr: %#lx\n",
+ store ? "ST" : "LD", cause, opc, badvaddr);
+ kvm_mips_dump_host_tlbs();
+ kvm_arch_vcpu_dump_regs(vcpu);
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
+{
+ return kvm_trap_emul_handle_tlb_miss(vcpu, true);
+}
+
+static int kvm_trap_emul_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
+{
+ return kvm_trap_emul_handle_tlb_miss(vcpu, false);
+}
+
+static int kvm_trap_emul_handle_addr_err_st(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ int ret = RESUME_GUEST;
+
+ if (KVM_GUEST_KERNEL_MODE(vcpu)
+ && (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) {
+ ret = kvm_mips_bad_store(cause, opc, run, vcpu);
+ } else {
+ kvm_err("Address Error (STORE): cause %#x, PC: %p, BadVaddr: %#lx\n",
+ cause, opc, badvaddr);
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_handle_addr_err_ld(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ int ret = RESUME_GUEST;
+
+ if (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1) {
+ ret = kvm_mips_bad_load(cause, opc, run, vcpu);
+ } else {
+ kvm_err("Address Error (LOAD): cause %#x, PC: %p, BadVaddr: %#lx\n",
+ cause, opc, badvaddr);
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_handle_syscall(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ er = kvm_mips_emulate_syscall(cause, opc, run, vcpu);
+ if (er == EMULATE_DONE)
+ ret = RESUME_GUEST;
+ else {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_handle_res_inst(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ er = kvm_mips_handle_ri(cause, opc, run, vcpu);
+ if (er == EMULATE_DONE)
+ ret = RESUME_GUEST;
+ else {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_handle_break(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ er = kvm_mips_emulate_bp_exc(cause, opc, run, vcpu);
+ if (er == EMULATE_DONE)
+ ret = RESUME_GUEST;
+ else {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_handle_trap(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *)vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ er = kvm_mips_emulate_trap_exc(cause, opc, run, vcpu);
+ if (er == EMULATE_DONE) {
+ ret = RESUME_GUEST;
+ } else {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_handle_msa_fpe(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *)vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ er = kvm_mips_emulate_msafpe_exc(cause, opc, run, vcpu);
+ if (er == EMULATE_DONE) {
+ ret = RESUME_GUEST;
+ } else {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_handle_fpe(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *)vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ er = kvm_mips_emulate_fpe_exc(cause, opc, run, vcpu);
+ if (er == EMULATE_DONE) {
+ ret = RESUME_GUEST;
+ } else {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
+
+/**
+ * kvm_trap_emul_handle_msa_disabled() - Guest used MSA while disabled in root.
+ * @vcpu: Virtual CPU context.
+ *
+ * Handle when the guest attempts to use MSA when it is disabled.
+ */
+static int kvm_trap_emul_handle_msa_disabled(struct kvm_vcpu *vcpu)
+{
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+ struct kvm_run *run = vcpu->run;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ u32 cause = vcpu->arch.host_cp0_cause;
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ if (!kvm_mips_guest_has_msa(&vcpu->arch) ||
+ (kvm_read_c0_guest_status(cop0) & (ST0_CU1 | ST0_FR)) == ST0_CU1) {
+ /*
+ * No MSA in guest, or FPU enabled and not in FR=1 mode,
+ * guest reserved instruction exception
+ */
+ er = kvm_mips_emulate_ri_exc(cause, opc, run, vcpu);
+ } else if (!(kvm_read_c0_guest_config5(cop0) & MIPS_CONF5_MSAEN)) {
+ /* MSA disabled by guest, guest MSA disabled exception */
+ er = kvm_mips_emulate_msadis_exc(cause, opc, run, vcpu);
+ } else {
+ /* Restore MSA/FPU state */
+ kvm_own_msa(vcpu);
+ er = EMULATE_DONE;
+ }
+
+ switch (er) {
+ case EMULATE_DONE:
+ ret = RESUME_GUEST;
+ break;
+
+ case EMULATE_FAIL:
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ break;
+
+ default:
+ BUG();
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_hardware_enable(void)
+{
+ return 0;
+}
+
+static void kvm_trap_emul_hardware_disable(void)
+{
+}
+
+static int kvm_trap_emul_check_extension(struct kvm *kvm, long ext)
+{
+ int r;
+
+ switch (ext) {
+ case KVM_CAP_MIPS_TE:
+ r = 1;
+ break;
+ default:
+ r = 0;
+ break;
+ }
+
+ return r;
+}
+
+static int kvm_trap_emul_vcpu_init(struct kvm_vcpu *vcpu)
+{
+ struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
+ struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
+
+ /*
+ * Allocate GVA -> HPA page tables.
+ * MIPS doesn't use the mm_struct pointer argument.
+ */
+ kern_mm->pgd = pgd_alloc(kern_mm);
+ if (!kern_mm->pgd)
+ return -ENOMEM;
+
+ user_mm->pgd = pgd_alloc(user_mm);
+ if (!user_mm->pgd) {
+ pgd_free(kern_mm, kern_mm->pgd);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void kvm_mips_emul_free_gva_pt(pgd_t *pgd)
+{
+ /* Don't free host kernel page tables copied from init_mm.pgd */
+ const unsigned long end = 0x80000000;
+ unsigned long pgd_va, pud_va, pmd_va;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ int i, j, k;
+
+ for (i = 0; i < USER_PTRS_PER_PGD; i++) {
+ if (pgd_none(pgd[i]))
+ continue;
+
+ pgd_va = (unsigned long)i << PGDIR_SHIFT;
+ if (pgd_va >= end)
+ break;
+ pud = pud_offset(pgd + i, 0);
+ for (j = 0; j < PTRS_PER_PUD; j++) {
+ if (pud_none(pud[j]))
+ continue;
+
+ pud_va = pgd_va | ((unsigned long)j << PUD_SHIFT);
+ if (pud_va >= end)
+ break;
+ pmd = pmd_offset(pud + j, 0);
+ for (k = 0; k < PTRS_PER_PMD; k++) {
+ if (pmd_none(pmd[k]))
+ continue;
+
+ pmd_va = pud_va | (k << PMD_SHIFT);
+ if (pmd_va >= end)
+ break;
+ pte = pte_offset(pmd + k, 0);
+ pte_free_kernel(NULL, pte);
+ }
+ pmd_free(NULL, pmd);
+ }
+ pud_free(NULL, pud);
+ }
+ pgd_free(NULL, pgd);
+}
+
+static void kvm_trap_emul_vcpu_uninit(struct kvm_vcpu *vcpu)
+{
+ kvm_mips_emul_free_gva_pt(vcpu->arch.guest_kernel_mm.pgd);
+ kvm_mips_emul_free_gva_pt(vcpu->arch.guest_user_mm.pgd);
+}
+
+static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu)
+{
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+ u32 config, config1;
+ int vcpu_id = vcpu->vcpu_id;
+
+ /* Start off the timer at 100 MHz */
+ kvm_mips_init_count(vcpu, 100*1000*1000);
+
+ /*
+ * Arch specific stuff, set up config registers properly so that the
+ * guest will come up as expected
+ */
+#ifndef CONFIG_CPU_MIPSR6
+ /* r2-r5, simulate a MIPS 24kc */
+ kvm_write_c0_guest_prid(cop0, 0x00019300);
+#else
+ /* r6+, simulate a generic QEMU machine */
+ kvm_write_c0_guest_prid(cop0, 0x00010000);
+#endif
+ /*
+ * Have config1, Cacheable, noncoherent, write-back, write allocate.
+ * Endianness, arch revision & virtually tagged icache should match
+ * host.
+ */
+ config = read_c0_config() & MIPS_CONF_AR;
+ config |= MIPS_CONF_M | CONF_CM_CACHABLE_NONCOHERENT | MIPS_CONF_MT_TLB;
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ config |= CONF_BE;
+#endif
+ if (cpu_has_vtag_icache)
+ config |= MIPS_CONF_VI;
+ kvm_write_c0_guest_config(cop0, config);
+
+ /* Read the cache characteristics from the host Config1 Register */
+ config1 = (read_c0_config1() & ~0x7f);
+
+ /* DCache line size not correctly reported in Config1 on Octeon CPUs */
+ if (cpu_dcache_line_size()) {
+ config1 &= ~MIPS_CONF1_DL;
+ config1 |= ((ilog2(cpu_dcache_line_size()) - 1) <<
+ MIPS_CONF1_DL_SHF) & MIPS_CONF1_DL;
+ }
+
+ /* Set up MMU size */
+ config1 &= ~(0x3f << 25);
+ config1 |= ((KVM_MIPS_GUEST_TLB_SIZE - 1) << 25);
+
+ /* We unset some bits that we aren't emulating */
+ config1 &= ~(MIPS_CONF1_C2 | MIPS_CONF1_MD | MIPS_CONF1_PC |
+ MIPS_CONF1_WR | MIPS_CONF1_CA);
+ kvm_write_c0_guest_config1(cop0, config1);
+
+ /* Have config3, no tertiary/secondary caches implemented */
+ kvm_write_c0_guest_config2(cop0, MIPS_CONF_M);
+ /* MIPS_CONF_M | (read_c0_config2() & 0xfff) */
+
+ /* Have config4, UserLocal */
+ kvm_write_c0_guest_config3(cop0, MIPS_CONF_M | MIPS_CONF3_ULRI);
+
+ /* Have config5 */
+ kvm_write_c0_guest_config4(cop0, MIPS_CONF_M);
+
+ /* No config6 */
+ kvm_write_c0_guest_config5(cop0, 0);
+
+ /* Set Wait IE/IXMT Ignore in Config7, IAR, AR */
+ kvm_write_c0_guest_config7(cop0, (MIPS_CONF7_WII) | (1 << 10));
+
+ /* Status */
+ kvm_write_c0_guest_status(cop0, ST0_BEV | ST0_ERL);
+
+ /*
+ * Setup IntCtl defaults, compatibility mode for timer interrupts (HW5)
+ */
+ kvm_write_c0_guest_intctl(cop0, 0xFC000000);
+
+ /* Put in vcpu id as CPUNum into Ebase Reg to handle SMP Guests */
+ kvm_write_c0_guest_ebase(cop0, KVM_GUEST_KSEG0 |
+ (vcpu_id & MIPS_EBASE_CPUNUM));
+
+ /* Put PC at guest reset vector */
+ vcpu->arch.pc = KVM_GUEST_CKSEG1ADDR(0x1fc00000);
+
+ return 0;
+}
+
+static void kvm_trap_emul_flush_shadow_all(struct kvm *kvm)
+{
+ /* Flush GVA page tables and invalidate GVA ASIDs on all VCPUs */
+ kvm_flush_remote_tlbs(kvm);
+}
+
+static void kvm_trap_emul_flush_shadow_memslot(struct kvm *kvm,
+ const struct kvm_memory_slot *slot)
+{
+ kvm_trap_emul_flush_shadow_all(kvm);
+}
+
+static u64 kvm_trap_emul_get_one_regs[] = {
+ KVM_REG_MIPS_CP0_INDEX,
+ KVM_REG_MIPS_CP0_ENTRYLO0,
+ KVM_REG_MIPS_CP0_ENTRYLO1,
+ KVM_REG_MIPS_CP0_CONTEXT,
+ KVM_REG_MIPS_CP0_USERLOCAL,
+ KVM_REG_MIPS_CP0_PAGEMASK,
+ KVM_REG_MIPS_CP0_WIRED,
+ KVM_REG_MIPS_CP0_HWRENA,
+ KVM_REG_MIPS_CP0_BADVADDR,
+ KVM_REG_MIPS_CP0_COUNT,
+ KVM_REG_MIPS_CP0_ENTRYHI,
+ KVM_REG_MIPS_CP0_COMPARE,
+ KVM_REG_MIPS_CP0_STATUS,
+ KVM_REG_MIPS_CP0_INTCTL,
+ KVM_REG_MIPS_CP0_CAUSE,
+ KVM_REG_MIPS_CP0_EPC,
+ KVM_REG_MIPS_CP0_PRID,
+ KVM_REG_MIPS_CP0_EBASE,
+ KVM_REG_MIPS_CP0_CONFIG,
+ KVM_REG_MIPS_CP0_CONFIG1,
+ KVM_REG_MIPS_CP0_CONFIG2,
+ KVM_REG_MIPS_CP0_CONFIG3,
+ KVM_REG_MIPS_CP0_CONFIG4,
+ KVM_REG_MIPS_CP0_CONFIG5,
+ KVM_REG_MIPS_CP0_CONFIG7,
+ KVM_REG_MIPS_CP0_ERROREPC,
+ KVM_REG_MIPS_CP0_KSCRATCH1,
+ KVM_REG_MIPS_CP0_KSCRATCH2,
+ KVM_REG_MIPS_CP0_KSCRATCH3,
+ KVM_REG_MIPS_CP0_KSCRATCH4,
+ KVM_REG_MIPS_CP0_KSCRATCH5,
+ KVM_REG_MIPS_CP0_KSCRATCH6,
+
+ KVM_REG_MIPS_COUNT_CTL,
+ KVM_REG_MIPS_COUNT_RESUME,
+ KVM_REG_MIPS_COUNT_HZ,
+};
+
+static unsigned long kvm_trap_emul_num_regs(struct kvm_vcpu *vcpu)
+{
+ return ARRAY_SIZE(kvm_trap_emul_get_one_regs);
+}
+
+static int kvm_trap_emul_copy_reg_indices(struct kvm_vcpu *vcpu,
+ u64 __user *indices)
+{
+ if (copy_to_user(indices, kvm_trap_emul_get_one_regs,
+ sizeof(kvm_trap_emul_get_one_regs)))
+ return -EFAULT;
+ indices += ARRAY_SIZE(kvm_trap_emul_get_one_regs);
+
+ return 0;
+}
+
+static int kvm_trap_emul_get_one_reg(struct kvm_vcpu *vcpu,
+ const struct kvm_one_reg *reg,
+ s64 *v)
+{
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+
+ switch (reg->id) {
+ case KVM_REG_MIPS_CP0_INDEX:
+ *v = (long)kvm_read_c0_guest_index(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_ENTRYLO0:
+ *v = kvm_read_c0_guest_entrylo0(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_ENTRYLO1:
+ *v = kvm_read_c0_guest_entrylo1(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CONTEXT:
+ *v = (long)kvm_read_c0_guest_context(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_USERLOCAL:
+ *v = (long)kvm_read_c0_guest_userlocal(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_PAGEMASK:
+ *v = (long)kvm_read_c0_guest_pagemask(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_WIRED:
+ *v = (long)kvm_read_c0_guest_wired(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_HWRENA:
+ *v = (long)kvm_read_c0_guest_hwrena(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_BADVADDR:
+ *v = (long)kvm_read_c0_guest_badvaddr(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_ENTRYHI:
+ *v = (long)kvm_read_c0_guest_entryhi(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_COMPARE:
+ *v = (long)kvm_read_c0_guest_compare(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_STATUS:
+ *v = (long)kvm_read_c0_guest_status(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_INTCTL:
+ *v = (long)kvm_read_c0_guest_intctl(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CAUSE:
+ *v = (long)kvm_read_c0_guest_cause(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_EPC:
+ *v = (long)kvm_read_c0_guest_epc(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_PRID:
+ *v = (long)kvm_read_c0_guest_prid(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_EBASE:
+ *v = (long)kvm_read_c0_guest_ebase(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG:
+ *v = (long)kvm_read_c0_guest_config(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG1:
+ *v = (long)kvm_read_c0_guest_config1(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG2:
+ *v = (long)kvm_read_c0_guest_config2(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG3:
+ *v = (long)kvm_read_c0_guest_config3(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG4:
+ *v = (long)kvm_read_c0_guest_config4(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG5:
+ *v = (long)kvm_read_c0_guest_config5(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG7:
+ *v = (long)kvm_read_c0_guest_config7(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_COUNT:
+ *v = kvm_mips_read_count(vcpu);
+ break;
+ case KVM_REG_MIPS_COUNT_CTL:
+ *v = vcpu->arch.count_ctl;
+ break;
+ case KVM_REG_MIPS_COUNT_RESUME:
+ *v = ktime_to_ns(vcpu->arch.count_resume);
+ break;
+ case KVM_REG_MIPS_COUNT_HZ:
+ *v = vcpu->arch.count_hz;
+ break;
+ case KVM_REG_MIPS_CP0_ERROREPC:
+ *v = (long)kvm_read_c0_guest_errorepc(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH1:
+ *v = (long)kvm_read_c0_guest_kscratch1(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH2:
+ *v = (long)kvm_read_c0_guest_kscratch2(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH3:
+ *v = (long)kvm_read_c0_guest_kscratch3(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH4:
+ *v = (long)kvm_read_c0_guest_kscratch4(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH5:
+ *v = (long)kvm_read_c0_guest_kscratch5(cop0);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH6:
+ *v = (long)kvm_read_c0_guest_kscratch6(cop0);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu,
+ const struct kvm_one_reg *reg,
+ s64 v)
+{
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+ int ret = 0;
+ unsigned int cur, change;
+
+ switch (reg->id) {
+ case KVM_REG_MIPS_CP0_INDEX:
+ kvm_write_c0_guest_index(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_ENTRYLO0:
+ kvm_write_c0_guest_entrylo0(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_ENTRYLO1:
+ kvm_write_c0_guest_entrylo1(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_CONTEXT:
+ kvm_write_c0_guest_context(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_USERLOCAL:
+ kvm_write_c0_guest_userlocal(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_PAGEMASK:
+ kvm_write_c0_guest_pagemask(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_WIRED:
+ kvm_write_c0_guest_wired(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_HWRENA:
+ kvm_write_c0_guest_hwrena(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_BADVADDR:
+ kvm_write_c0_guest_badvaddr(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_ENTRYHI:
+ kvm_write_c0_guest_entryhi(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_STATUS:
+ kvm_write_c0_guest_status(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_INTCTL:
+ /* No VInt, so no VS, read-only for now */
+ break;
+ case KVM_REG_MIPS_CP0_EPC:
+ kvm_write_c0_guest_epc(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_PRID:
+ kvm_write_c0_guest_prid(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_EBASE:
+ /*
+ * Allow core number to be written, but the exception base must
+ * remain in guest KSeg0.
+ */
+ kvm_change_c0_guest_ebase(cop0, 0x1ffff000 | MIPS_EBASE_CPUNUM,
+ v);
+ break;
+ case KVM_REG_MIPS_CP0_COUNT:
+ kvm_mips_write_count(vcpu, v);
+ break;
+ case KVM_REG_MIPS_CP0_COMPARE:
+ kvm_mips_write_compare(vcpu, v, false);
+ break;
+ case KVM_REG_MIPS_CP0_CAUSE:
+ /*
+ * If the timer is stopped or started (DC bit) it must look
+ * atomic with changes to the interrupt pending bits (TI, IRQ5).
+ * A timer interrupt should not happen in between.
+ */
+ if ((kvm_read_c0_guest_cause(cop0) ^ v) & CAUSEF_DC) {
+ if (v & CAUSEF_DC) {
+ /* disable timer first */
+ kvm_mips_count_disable_cause(vcpu);
+ kvm_change_c0_guest_cause(cop0, (u32)~CAUSEF_DC,
+ v);
+ } else {
+ /* enable timer last */
+ kvm_change_c0_guest_cause(cop0, (u32)~CAUSEF_DC,
+ v);
+ kvm_mips_count_enable_cause(vcpu);
+ }
+ } else {
+ kvm_write_c0_guest_cause(cop0, v);
+ }
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG:
+ /* read-only for now */
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG1:
+ cur = kvm_read_c0_guest_config1(cop0);
+ change = (cur ^ v) & kvm_mips_config1_wrmask(vcpu);
+ if (change) {
+ v = cur ^ change;
+ kvm_write_c0_guest_config1(cop0, v);
+ }
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG2:
+ /* read-only for now */
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG3:
+ cur = kvm_read_c0_guest_config3(cop0);
+ change = (cur ^ v) & kvm_mips_config3_wrmask(vcpu);
+ if (change) {
+ v = cur ^ change;
+ kvm_write_c0_guest_config3(cop0, v);
+ }
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG4:
+ cur = kvm_read_c0_guest_config4(cop0);
+ change = (cur ^ v) & kvm_mips_config4_wrmask(vcpu);
+ if (change) {
+ v = cur ^ change;
+ kvm_write_c0_guest_config4(cop0, v);
+ }
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG5:
+ cur = kvm_read_c0_guest_config5(cop0);
+ change = (cur ^ v) & kvm_mips_config5_wrmask(vcpu);
+ if (change) {
+ v = cur ^ change;
+ kvm_write_c0_guest_config5(cop0, v);
+ }
+ break;
+ case KVM_REG_MIPS_CP0_CONFIG7:
+ /* writes ignored */
+ break;
+ case KVM_REG_MIPS_COUNT_CTL:
+ ret = kvm_mips_set_count_ctl(vcpu, v);
+ break;
+ case KVM_REG_MIPS_COUNT_RESUME:
+ ret = kvm_mips_set_count_resume(vcpu, v);
+ break;
+ case KVM_REG_MIPS_COUNT_HZ:
+ ret = kvm_mips_set_count_hz(vcpu, v);
+ break;
+ case KVM_REG_MIPS_CP0_ERROREPC:
+ kvm_write_c0_guest_errorepc(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH1:
+ kvm_write_c0_guest_kscratch1(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH2:
+ kvm_write_c0_guest_kscratch2(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH3:
+ kvm_write_c0_guest_kscratch3(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH4:
+ kvm_write_c0_guest_kscratch4(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH5:
+ kvm_write_c0_guest_kscratch5(cop0, v);
+ break;
+ case KVM_REG_MIPS_CP0_KSCRATCH6:
+ kvm_write_c0_guest_kscratch6(cop0, v);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return ret;
+}
+
+static int kvm_trap_emul_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
+ struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
+ struct mm_struct *mm;
+
+ /*
+ * Were we in guest context? If so, restore the appropriate ASID based
+ * on the mode of the Guest (Kernel/User).
+ */
+ if (current->flags & PF_VCPU) {
+ mm = KVM_GUEST_KERNEL_MODE(vcpu) ? kern_mm : user_mm;
+ if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) &
+ asid_version_mask(cpu))
+ get_new_mmu_context(mm, cpu);
+ write_c0_entryhi(cpu_asid(cpu, mm));
+ TLBMISS_HANDLER_SETUP_PGD(mm->pgd);
+ kvm_mips_suspend_mm(cpu);
+ ehb();
+ }
+
+ return 0;
+}
+
+static int kvm_trap_emul_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
+{
+ kvm_lose_fpu(vcpu);
+
+ if (current->flags & PF_VCPU) {
+ /* Restore normal Linux process memory map */
+ if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
+ asid_version_mask(cpu)))
+ get_new_mmu_context(current->mm, cpu);
+ write_c0_entryhi(cpu_asid(cpu, current->mm));
+ TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd);
+ kvm_mips_resume_mm(cpu);
+ ehb();
+ }
+
+ return 0;
+}
+
+static void kvm_trap_emul_check_requests(struct kvm_vcpu *vcpu, int cpu,
+ bool reload_asid)
+{
+ struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
+ struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
+ struct mm_struct *mm;
+ int i;
+
+ if (likely(!kvm_request_pending(vcpu)))
+ return;
+
+ if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
+ /*
+ * Both kernel & user GVA mappings must be invalidated. The
+ * caller is just about to check whether the ASID is stale
+ * anyway so no need to reload it here.
+ */
+ kvm_mips_flush_gva_pt(kern_mm->pgd, KMF_GPA | KMF_KERN);
+ kvm_mips_flush_gva_pt(user_mm->pgd, KMF_GPA | KMF_USER);
+ for_each_possible_cpu(i) {
+ cpu_context(i, kern_mm) = 0;
+ cpu_context(i, user_mm) = 0;
+ }
+
+ /* Generate new ASID for current mode */
+ if (reload_asid) {
+ mm = KVM_GUEST_KERNEL_MODE(vcpu) ? kern_mm : user_mm;
+ get_new_mmu_context(mm, cpu);
+ htw_stop();
+ write_c0_entryhi(cpu_asid(cpu, mm));
+ TLBMISS_HANDLER_SETUP_PGD(mm->pgd);
+ htw_start();
+ }
+ }
+}
+
+/**
+ * kvm_trap_emul_gva_lockless_begin() - Begin lockless access to GVA space.
+ * @vcpu: VCPU pointer.
+ *
+ * Call before a GVA space access outside of guest mode, to ensure that
+ * asynchronous TLB flush requests are handled or delayed until completion of
+ * the GVA access (as indicated by a matching kvm_trap_emul_gva_lockless_end()).
+ *
+ * Should be called with IRQs already enabled.
+ */
+void kvm_trap_emul_gva_lockless_begin(struct kvm_vcpu *vcpu)
+{
+ /* We re-enable IRQs in kvm_trap_emul_gva_lockless_end() */
+ WARN_ON_ONCE(irqs_disabled());
+
+ /*
+ * The caller is about to access the GVA space, so we set the mode to
+ * force TLB flush requests to send an IPI, and also disable IRQs to
+ * delay IPI handling until kvm_trap_emul_gva_lockless_end().
+ */
+ local_irq_disable();
+
+ /*
+ * Make sure the read of VCPU requests is not reordered ahead of the
+ * write to vcpu->mode, or we could miss a TLB flush request while
+ * the requester sees the VCPU as outside of guest mode and not needing
+ * an IPI.
+ */
+ smp_store_mb(vcpu->mode, READING_SHADOW_PAGE_TABLES);
+
+ /*
+ * If a TLB flush has been requested (potentially while
+ * OUTSIDE_GUEST_MODE and assumed immediately effective), perform it
+ * before accessing the GVA space, and be sure to reload the ASID if
+ * necessary as it'll be immediately used.
+ *
+ * TLB flush requests after this check will trigger an IPI due to the
+ * mode change above, which will be delayed due to IRQs disabled.
+ */
+ kvm_trap_emul_check_requests(vcpu, smp_processor_id(), true);
+}
+
+/**
+ * kvm_trap_emul_gva_lockless_end() - End lockless access to GVA space.
+ * @vcpu: VCPU pointer.
+ *
+ * Called after a GVA space access outside of guest mode. Should have a matching
+ * call to kvm_trap_emul_gva_lockless_begin().
+ */
+void kvm_trap_emul_gva_lockless_end(struct kvm_vcpu *vcpu)
+{
+ /*
+ * Make sure the write to vcpu->mode is not reordered in front of GVA
+ * accesses, or a TLB flush requester may not think it necessary to send
+ * an IPI.
+ */
+ smp_store_release(&vcpu->mode, OUTSIDE_GUEST_MODE);
+
+ /*
+ * Now that the access to GVA space is complete, its safe for pending
+ * TLB flush request IPIs to be handled (which indicates completion).
+ */
+ local_irq_enable();
+}
+
+static void kvm_trap_emul_vcpu_reenter(struct kvm_run *run,
+ struct kvm_vcpu *vcpu)
+{
+ struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
+ struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
+ struct mm_struct *mm;
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+ int i, cpu = smp_processor_id();
+ unsigned int gasid;
+
+ /*
+ * No need to reload ASID, IRQs are disabled already so there's no rush,
+ * and we'll check if we need to regenerate below anyway before
+ * re-entering the guest.
+ */
+ kvm_trap_emul_check_requests(vcpu, cpu, false);
+
+ if (KVM_GUEST_KERNEL_MODE(vcpu)) {
+ mm = kern_mm;
+ } else {
+ mm = user_mm;
+
+ /*
+ * Lazy host ASID regeneration / PT flush for guest user mode.
+ * If the guest ASID has changed since the last guest usermode
+ * execution, invalidate the stale TLB entries and flush GVA PT
+ * entries too.
+ */
+ gasid = kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID;
+ if (gasid != vcpu->arch.last_user_gasid) {
+ kvm_mips_flush_gva_pt(user_mm->pgd, KMF_USER);
+ for_each_possible_cpu(i)
+ cpu_context(i, user_mm) = 0;
+ vcpu->arch.last_user_gasid = gasid;
+ }
+ }
+
+ /*
+ * Check if ASID is stale. This may happen due to a TLB flush request or
+ * a lazy user MM invalidation.
+ */
+ if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) &
+ asid_version_mask(cpu))
+ get_new_mmu_context(mm, cpu);
+}
+
+static int kvm_trap_emul_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
+{
+ int cpu = smp_processor_id();
+ int r;
+
+ /* Check if we have any exceptions/interrupts pending */
+ kvm_mips_deliver_interrupts(vcpu,
+ kvm_read_c0_guest_cause(vcpu->arch.cop0));
+
+ kvm_trap_emul_vcpu_reenter(run, vcpu);
+
+ /*
+ * We use user accessors to access guest memory, but we don't want to
+ * invoke Linux page faulting.
+ */
+ pagefault_disable();
+
+ /* Disable hardware page table walking while in guest */
+ htw_stop();
+
+ /*
+ * While in guest context we're in the guest's address space, not the
+ * host process address space, so we need to be careful not to confuse
+ * e.g. cache management IPIs.
+ */
+ kvm_mips_suspend_mm(cpu);
+
+ r = vcpu->arch.vcpu_run(run, vcpu);
+
+ /* We may have migrated while handling guest exits */
+ cpu = smp_processor_id();
+
+ /* Restore normal Linux process memory map */
+ if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
+ asid_version_mask(cpu)))
+ get_new_mmu_context(current->mm, cpu);
+ write_c0_entryhi(cpu_asid(cpu, current->mm));
+ TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd);
+ kvm_mips_resume_mm(cpu);
+
+ htw_start();
+
+ pagefault_enable();
+
+ return r;
+}
+
+static struct kvm_mips_callbacks kvm_trap_emul_callbacks = {
+ /* exit handlers */
+ .handle_cop_unusable = kvm_trap_emul_handle_cop_unusable,
+ .handle_tlb_mod = kvm_trap_emul_handle_tlb_mod,
+ .handle_tlb_st_miss = kvm_trap_emul_handle_tlb_st_miss,
+ .handle_tlb_ld_miss = kvm_trap_emul_handle_tlb_ld_miss,
+ .handle_addr_err_st = kvm_trap_emul_handle_addr_err_st,
+ .handle_addr_err_ld = kvm_trap_emul_handle_addr_err_ld,
+ .handle_syscall = kvm_trap_emul_handle_syscall,
+ .handle_res_inst = kvm_trap_emul_handle_res_inst,
+ .handle_break = kvm_trap_emul_handle_break,
+ .handle_trap = kvm_trap_emul_handle_trap,
+ .handle_msa_fpe = kvm_trap_emul_handle_msa_fpe,
+ .handle_fpe = kvm_trap_emul_handle_fpe,
+ .handle_msa_disabled = kvm_trap_emul_handle_msa_disabled,
+ .handle_guest_exit = kvm_trap_emul_no_handler,
+
+ .hardware_enable = kvm_trap_emul_hardware_enable,
+ .hardware_disable = kvm_trap_emul_hardware_disable,
+ .check_extension = kvm_trap_emul_check_extension,
+ .vcpu_init = kvm_trap_emul_vcpu_init,
+ .vcpu_uninit = kvm_trap_emul_vcpu_uninit,
+ .vcpu_setup = kvm_trap_emul_vcpu_setup,
+ .flush_shadow_all = kvm_trap_emul_flush_shadow_all,
+ .flush_shadow_memslot = kvm_trap_emul_flush_shadow_memslot,
+ .gva_to_gpa = kvm_trap_emul_gva_to_gpa_cb,
+ .queue_timer_int = kvm_mips_queue_timer_int_cb,
+ .dequeue_timer_int = kvm_mips_dequeue_timer_int_cb,
+ .queue_io_int = kvm_mips_queue_io_int_cb,
+ .dequeue_io_int = kvm_mips_dequeue_io_int_cb,
+ .irq_deliver = kvm_mips_irq_deliver_cb,
+ .irq_clear = kvm_mips_irq_clear_cb,
+ .num_regs = kvm_trap_emul_num_regs,
+ .copy_reg_indices = kvm_trap_emul_copy_reg_indices,
+ .get_one_reg = kvm_trap_emul_get_one_reg,
+ .set_one_reg = kvm_trap_emul_set_one_reg,
+ .vcpu_load = kvm_trap_emul_vcpu_load,
+ .vcpu_put = kvm_trap_emul_vcpu_put,
+ .vcpu_run = kvm_trap_emul_vcpu_run,
+ .vcpu_reenter = kvm_trap_emul_vcpu_reenter,
+};
+
+int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks)
+{
+ *install_callbacks = &kvm_trap_emul_callbacks;
+ return 0;
+}