KVM/MIPS32: MIPS arch specific APIs for KVM
- Implements the arch specific APIs for KVM, some are stubs for MIPS - kvm_mips_handle_exit(): Main 'C' distpatch routine for handling exceptions while in "Guest" mode. - Also implements in-kernel timer interrupt support for the guest. Signed-off-by: Sanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Sanjay Lal
Ralf Baechle
parent
b680f70fc1
commit
669e846e6c
2 changed files with 1004 additions and 0 deletions
958
arch/mips/kvm/kvm_mips.c
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958
arch/mips/kvm/kvm_mips.c
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* KVM/MIPS: MIPS specific KVM APIs
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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* Authors: Sanjay Lal <sanjayl@kymasys.com>
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/bootmem.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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#include <linux/kvm_host.h>
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#include "kvm_mips_int.h"
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#include "kvm_mips_comm.h"
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#define CREATE_TRACE_POINTS
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#include "trace.h"
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#ifndef VECTORSPACING
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#define VECTORSPACING 0x100 /* for EI/VI mode */
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#endif
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#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
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struct kvm_stats_debugfs_item debugfs_entries[] = {
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{ "wait", VCPU_STAT(wait_exits) },
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{ "cache", VCPU_STAT(cache_exits) },
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{ "signal", VCPU_STAT(signal_exits) },
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{ "interrupt", VCPU_STAT(int_exits) },
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{ "cop_unsuable", VCPU_STAT(cop_unusable_exits) },
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{ "tlbmod", VCPU_STAT(tlbmod_exits) },
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{ "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits) },
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{ "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits) },
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{ "addrerr_st", VCPU_STAT(addrerr_st_exits) },
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{ "addrerr_ld", VCPU_STAT(addrerr_ld_exits) },
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{ "syscall", VCPU_STAT(syscall_exits) },
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{ "resvd_inst", VCPU_STAT(resvd_inst_exits) },
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{ "break_inst", VCPU_STAT(break_inst_exits) },
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{ "flush_dcache", VCPU_STAT(flush_dcache_exits) },
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{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
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{NULL}
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};
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static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
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{
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int i;
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for_each_possible_cpu(i) {
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vcpu->arch.guest_kernel_asid[i] = 0;
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vcpu->arch.guest_user_asid[i] = 0;
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}
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return 0;
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}
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gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
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{
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return gfn;
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}
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/* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we
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* are "runnable" if interrupts are pending
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*/
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int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
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{
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return !!(vcpu->arch.pending_exceptions);
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}
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int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
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{
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return 1;
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}
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int kvm_arch_hardware_enable(void *garbage)
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{
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return 0;
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}
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void kvm_arch_hardware_disable(void *garbage)
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{
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}
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int kvm_arch_hardware_setup(void)
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{
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return 0;
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}
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void kvm_arch_hardware_unsetup(void)
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{
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}
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void kvm_arch_check_processor_compat(void *rtn)
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{
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int *r = (int *)rtn;
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*r = 0;
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return;
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}
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static void kvm_mips_init_tlbs(struct kvm *kvm)
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{
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unsigned long wired;
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/* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */
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wired = read_c0_wired();
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write_c0_wired(wired + 1);
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mtc0_tlbw_hazard();
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kvm->arch.commpage_tlb = wired;
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kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
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kvm->arch.commpage_tlb);
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}
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static void kvm_mips_init_vm_percpu(void *arg)
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{
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struct kvm *kvm = (struct kvm *)arg;
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kvm_mips_init_tlbs(kvm);
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kvm_mips_callbacks->vm_init(kvm);
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}
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int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
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{
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if (atomic_inc_return(&kvm_mips_instance) == 1) {
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kvm_info("%s: 1st KVM instance, setup host TLB parameters\n",
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__func__);
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on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
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}
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return 0;
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}
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void kvm_mips_free_vcpus(struct kvm *kvm)
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{
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unsigned int i;
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struct kvm_vcpu *vcpu;
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/* Put the pages we reserved for the guest pmap */
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for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
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if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
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kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
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}
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if (kvm->arch.guest_pmap)
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kfree(kvm->arch.guest_pmap);
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kvm_for_each_vcpu(i, vcpu, kvm) {
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kvm_arch_vcpu_free(vcpu);
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}
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mutex_lock(&kvm->lock);
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for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
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kvm->vcpus[i] = NULL;
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atomic_set(&kvm->online_vcpus, 0);
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mutex_unlock(&kvm->lock);
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}
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void kvm_arch_sync_events(struct kvm *kvm)
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{
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}
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static void kvm_mips_uninit_tlbs(void *arg)
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{
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/* Restore wired count */
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write_c0_wired(0);
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mtc0_tlbw_hazard();
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/* Clear out all the TLBs */
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kvm_local_flush_tlb_all();
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}
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void kvm_arch_destroy_vm(struct kvm *kvm)
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{
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kvm_mips_free_vcpus(kvm);
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/* If this is the last instance, restore wired count */
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if (atomic_dec_return(&kvm_mips_instance) == 0) {
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kvm_info("%s: last KVM instance, restoring TLB parameters\n",
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__func__);
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on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
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}
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}
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long
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kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
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{
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return -EINVAL;
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}
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void kvm_arch_free_memslot(struct kvm_memory_slot *free,
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struct kvm_memory_slot *dont)
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{
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}
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int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
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{
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return 0;
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}
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int kvm_arch_prepare_memory_region(struct kvm *kvm,
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struct kvm_memory_slot *memslot,
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struct kvm_memory_slot old,
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struct kvm_userspace_memory_region *mem,
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bool user_alloc)
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{
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return 0;
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}
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void kvm_arch_commit_memory_region(struct kvm *kvm,
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struct kvm_userspace_memory_region *mem,
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struct kvm_memory_slot old, bool user_alloc)
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{
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unsigned long npages = 0;
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int i, err = 0;
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kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
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__func__, kvm, mem->slot, mem->guest_phys_addr,
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mem->memory_size, mem->userspace_addr);
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/* Setup Guest PMAP table */
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if (!kvm->arch.guest_pmap) {
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if (mem->slot == 0)
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npages = mem->memory_size >> PAGE_SHIFT;
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if (npages) {
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kvm->arch.guest_pmap_npages = npages;
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kvm->arch.guest_pmap =
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kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
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if (!kvm->arch.guest_pmap) {
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kvm_err("Failed to allocate guest PMAP");
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err = -ENOMEM;
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goto out;
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}
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kvm_info
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("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
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npages, kvm->arch.guest_pmap);
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/* Now setup the page table */
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for (i = 0; i < npages; i++) {
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kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
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}
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}
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}
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out:
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return;
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}
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void kvm_arch_flush_shadow_all(struct kvm *kvm)
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{
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}
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void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
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struct kvm_memory_slot *slot)
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{
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}
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void kvm_arch_flush_shadow(struct kvm *kvm)
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{
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}
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struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
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{
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extern char mips32_exception[], mips32_exceptionEnd[];
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extern char mips32_GuestException[], mips32_GuestExceptionEnd[];
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int err, size, offset;
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void *gebase;
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int i;
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struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
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if (!vcpu) {
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err = -ENOMEM;
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goto out;
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}
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err = kvm_vcpu_init(vcpu, kvm, id);
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if (err)
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goto out_free_cpu;
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kvm_info("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
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/* Allocate space for host mode exception handlers that handle
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* guest mode exits
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*/
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if (cpu_has_veic || cpu_has_vint) {
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size = 0x200 + VECTORSPACING * 64;
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} else {
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size = 0x200;
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}
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/* Save Linux EBASE */
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vcpu->arch.host_ebase = (void *)read_c0_ebase();
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gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
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if (!gebase) {
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err = -ENOMEM;
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goto out_free_cpu;
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}
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kvm_info("Allocated %d bytes for KVM Exception Handlers @ %p\n",
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ALIGN(size, PAGE_SIZE), gebase);
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/* Save new ebase */
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vcpu->arch.guest_ebase = gebase;
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/* Copy L1 Guest Exception handler to correct offset */
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/* TLB Refill, EXL = 0 */
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memcpy(gebase, mips32_exception,
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mips32_exceptionEnd - mips32_exception);
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/* General Exception Entry point */
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memcpy(gebase + 0x180, mips32_exception,
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mips32_exceptionEnd - mips32_exception);
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/* For vectored interrupts poke the exception code @ all offsets 0-7 */
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for (i = 0; i < 8; i++) {
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kvm_debug("L1 Vectored handler @ %p\n",
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gebase + 0x200 + (i * VECTORSPACING));
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memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
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mips32_exceptionEnd - mips32_exception);
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}
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/* General handler, relocate to unmapped space for sanity's sake */
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offset = 0x2000;
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kvm_info("Installing KVM Exception handlers @ %p, %#x bytes\n",
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gebase + offset,
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mips32_GuestExceptionEnd - mips32_GuestException);
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memcpy(gebase + offset, mips32_GuestException,
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mips32_GuestExceptionEnd - mips32_GuestException);
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/* Invalidate the icache for these ranges */
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mips32_SyncICache((unsigned long) gebase, ALIGN(size, PAGE_SIZE));
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/* Allocate comm page for guest kernel, a TLB will be reserved for mapping GVA @ 0xFFFF8000 to this page */
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vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
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if (!vcpu->arch.kseg0_commpage) {
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err = -ENOMEM;
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goto out_free_gebase;
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}
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kvm_info("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
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kvm_mips_commpage_init(vcpu);
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/* Init */
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vcpu->arch.last_sched_cpu = -1;
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/* Start off the timer */
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kvm_mips_emulate_count(vcpu);
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return vcpu;
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out_free_gebase:
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kfree(gebase);
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out_free_cpu:
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kfree(vcpu);
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out:
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return ERR_PTR(err);
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}
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void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
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{
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hrtimer_cancel(&vcpu->arch.comparecount_timer);
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kvm_vcpu_uninit(vcpu);
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kvm_mips_dump_stats(vcpu);
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if (vcpu->arch.guest_ebase)
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kfree(vcpu->arch.guest_ebase);
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if (vcpu->arch.kseg0_commpage)
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kfree(vcpu->arch.kseg0_commpage);
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}
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void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
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{
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kvm_arch_vcpu_free(vcpu);
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}
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int
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kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug *dbg)
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{
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return -EINVAL;
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}
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int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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int r = 0;
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sigset_t sigsaved;
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if (vcpu->sigset_active)
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sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
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if (vcpu->mmio_needed) {
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if (!vcpu->mmio_is_write)
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kvm_mips_complete_mmio_load(vcpu, run);
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vcpu->mmio_needed = 0;
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}
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/* Check if we have any exceptions/interrupts pending */
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kvm_mips_deliver_interrupts(vcpu,
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kvm_read_c0_guest_cause(vcpu->arch.cop0));
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local_irq_disable();
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kvm_guest_enter();
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r = __kvm_mips_vcpu_run(run, vcpu);
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kvm_guest_exit();
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local_irq_enable();
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if (vcpu->sigset_active)
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sigprocmask(SIG_SETMASK, &sigsaved, NULL);
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return r;
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}
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int
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kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
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{
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int intr = (int)irq->irq;
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struct kvm_vcpu *dvcpu = NULL;
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if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
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kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
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(int)intr);
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if (irq->cpu == -1)
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dvcpu = vcpu;
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else
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dvcpu = vcpu->kvm->vcpus[irq->cpu];
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if (intr == 2 || intr == 3 || intr == 4) {
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kvm_mips_callbacks->queue_io_int(dvcpu, irq);
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} else if (intr == -2 || intr == -3 || intr == -4) {
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kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
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} else {
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kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
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irq->cpu, irq->irq);
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return -EINVAL;
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}
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dvcpu->arch.wait = 0;
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if (waitqueue_active(&dvcpu->wq)) {
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wake_up_interruptible(&dvcpu->wq);
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}
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return 0;
|
||||
}
|
||||
|
||||
int
|
||||
kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
|
||||
struct kvm_mp_state *mp_state)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
int
|
||||
kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
|
||||
struct kvm_mp_state *mp_state)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
long
|
||||
kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
|
||||
{
|
||||
struct kvm_vcpu *vcpu = filp->private_data;
|
||||
void __user *argp = (void __user *)arg;
|
||||
long r;
|
||||
int intr;
|
||||
|
||||
switch (ioctl) {
|
||||
case KVM_NMI:
|
||||
/* Treat the NMI as a CPU reset */
|
||||
r = kvm_mips_reset_vcpu(vcpu);
|
||||
break;
|
||||
case KVM_INTERRUPT:
|
||||
{
|
||||
struct kvm_mips_interrupt irq;
|
||||
r = -EFAULT;
|
||||
if (copy_from_user(&irq, argp, sizeof(irq)))
|
||||
goto out;
|
||||
|
||||
intr = (int)irq.irq;
|
||||
|
||||
kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
|
||||
irq.irq);
|
||||
|
||||
r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
r = -EINVAL;
|
||||
}
|
||||
|
||||
out:
|
||||
return r;
|
||||
}
|
||||
|
||||
/*
|
||||
* Get (and clear) the dirty memory log for a memory slot.
|
||||
*/
|
||||
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
|
||||
{
|
||||
struct kvm_memory_slot *memslot;
|
||||
unsigned long ga, ga_end;
|
||||
int is_dirty = 0;
|
||||
int r;
|
||||
unsigned long n;
|
||||
|
||||
mutex_lock(&kvm->slots_lock);
|
||||
|
||||
r = kvm_get_dirty_log(kvm, log, &is_dirty);
|
||||
if (r)
|
||||
goto out;
|
||||
|
||||
/* If nothing is dirty, don't bother messing with page tables. */
|
||||
if (is_dirty) {
|
||||
memslot = &kvm->memslots->memslots[log->slot];
|
||||
|
||||
ga = memslot->base_gfn << PAGE_SHIFT;
|
||||
ga_end = ga + (memslot->npages << PAGE_SHIFT);
|
||||
|
||||
printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
|
||||
ga_end);
|
||||
|
||||
n = kvm_dirty_bitmap_bytes(memslot);
|
||||
memset(memslot->dirty_bitmap, 0, n);
|
||||
}
|
||||
|
||||
r = 0;
|
||||
out:
|
||||
mutex_unlock(&kvm->slots_lock);
|
||||
return r;
|
||||
|
||||
}
|
||||
|
||||
long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
|
||||
{
|
||||
long r;
|
||||
|
||||
switch (ioctl) {
|
||||
default:
|
||||
r = -EINVAL;
|
||||
}
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
int kvm_arch_init(void *opaque)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (kvm_mips_callbacks) {
|
||||
kvm_err("kvm: module already exists\n");
|
||||
return -EEXIST;
|
||||
}
|
||||
|
||||
ret = kvm_mips_emulation_init(&kvm_mips_callbacks);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
void kvm_arch_exit(void)
|
||||
{
|
||||
kvm_mips_callbacks = NULL;
|
||||
}
|
||||
|
||||
int
|
||||
kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
|
||||
{
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
int
|
||||
kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
|
||||
{
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
|
||||
{
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
|
||||
{
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
|
||||
{
|
||||
return VM_FAULT_SIGBUS;
|
||||
}
|
||||
|
||||
int kvm_dev_ioctl_check_extension(long ext)
|
||||
{
|
||||
int r;
|
||||
|
||||
switch (ext) {
|
||||
case KVM_CAP_COALESCED_MMIO:
|
||||
r = KVM_COALESCED_MMIO_PAGE_OFFSET;
|
||||
break;
|
||||
default:
|
||||
r = 0;
|
||||
break;
|
||||
}
|
||||
return r;
|
||||
|
||||
}
|
||||
|
||||
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
return kvm_mips_pending_timer(vcpu);
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
int i;
|
||||
struct mips_coproc *cop0;
|
||||
|
||||
if (!vcpu)
|
||||
return -1;
|
||||
|
||||
printk("VCPU Register Dump:\n");
|
||||
printk("\tpc = 0x%08lx\n", vcpu->arch.pc);;
|
||||
printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
|
||||
|
||||
for (i = 0; i < 32; i += 4) {
|
||||
printk("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
|
||||
vcpu->arch.gprs[i],
|
||||
vcpu->arch.gprs[i + 1],
|
||||
vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
|
||||
}
|
||||
printk("\thi: 0x%08lx\n", vcpu->arch.hi);
|
||||
printk("\tlo: 0x%08lx\n", vcpu->arch.lo);
|
||||
|
||||
cop0 = vcpu->arch.cop0;
|
||||
printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
|
||||
kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0));
|
||||
|
||||
printk("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 32; i++)
|
||||
vcpu->arch.gprs[i] = regs->gprs[i];
|
||||
|
||||
vcpu->arch.hi = regs->hi;
|
||||
vcpu->arch.lo = regs->lo;
|
||||
vcpu->arch.pc = regs->pc;
|
||||
|
||||
return kvm_mips_callbacks->vcpu_ioctl_set_regs(vcpu, regs);
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 32; i++)
|
||||
regs->gprs[i] = vcpu->arch.gprs[i];
|
||||
|
||||
regs->hi = vcpu->arch.hi;
|
||||
regs->lo = vcpu->arch.lo;
|
||||
regs->pc = vcpu->arch.pc;
|
||||
|
||||
return kvm_mips_callbacks->vcpu_ioctl_get_regs(vcpu, regs);
|
||||
}
|
||||
|
||||
void kvm_mips_comparecount_func(unsigned long data)
|
||||
{
|
||||
struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
|
||||
|
||||
kvm_mips_callbacks->queue_timer_int(vcpu);
|
||||
|
||||
vcpu->arch.wait = 0;
|
||||
if (waitqueue_active(&vcpu->wq)) {
|
||||
wake_up_interruptible(&vcpu->wq);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* low level hrtimer wake routine.
|
||||
*/
|
||||
enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
|
||||
{
|
||||
struct kvm_vcpu *vcpu;
|
||||
|
||||
vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
|
||||
kvm_mips_comparecount_func((unsigned long) vcpu);
|
||||
hrtimer_forward_now(&vcpu->arch.comparecount_timer,
|
||||
ktime_set(0, MS_TO_NS(10)));
|
||||
return HRTIMER_RESTART;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
kvm_mips_callbacks->vcpu_init(vcpu);
|
||||
hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
|
||||
HRTIMER_MODE_REL);
|
||||
vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
|
||||
kvm_mips_init_shadow_tlb(vcpu);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
int
|
||||
kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Initial guest state */
|
||||
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
return kvm_mips_callbacks->vcpu_setup(vcpu);
|
||||
}
|
||||
|
||||
static
|
||||
void kvm_mips_set_c0_status(void)
|
||||
{
|
||||
uint32_t status = read_c0_status();
|
||||
|
||||
if (cpu_has_fpu)
|
||||
status |= (ST0_CU1);
|
||||
|
||||
if (cpu_has_dsp)
|
||||
status |= (ST0_MX);
|
||||
|
||||
write_c0_status(status);
|
||||
ehb();
|
||||
}
|
||||
|
||||
/*
|
||||
* Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
|
||||
*/
|
||||
int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
|
||||
{
|
||||
uint32_t cause = vcpu->arch.host_cp0_cause;
|
||||
uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
|
||||
uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
|
||||
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
|
||||
enum emulation_result er = EMULATE_DONE;
|
||||
int ret = RESUME_GUEST;
|
||||
|
||||
/* Set a default exit reason */
|
||||
run->exit_reason = KVM_EXIT_UNKNOWN;
|
||||
run->ready_for_interrupt_injection = 1;
|
||||
|
||||
/* Set the appropriate status bits based on host CPU features, before we hit the scheduler */
|
||||
kvm_mips_set_c0_status();
|
||||
|
||||
local_irq_enable();
|
||||
|
||||
kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
|
||||
cause, opc, run, vcpu);
|
||||
|
||||
/* Do a privilege check, if in UM most of these exit conditions end up
|
||||
* causing an exception to be delivered to the Guest Kernel
|
||||
*/
|
||||
er = kvm_mips_check_privilege(cause, opc, run, vcpu);
|
||||
if (er == EMULATE_PRIV_FAIL) {
|
||||
goto skip_emul;
|
||||
} else if (er == EMULATE_FAIL) {
|
||||
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
||||
ret = RESUME_HOST;
|
||||
goto skip_emul;
|
||||
}
|
||||
|
||||
switch (exccode) {
|
||||
case T_INT:
|
||||
kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
|
||||
|
||||
++vcpu->stat.int_exits;
|
||||
trace_kvm_exit(vcpu, INT_EXITS);
|
||||
|
||||
if (need_resched()) {
|
||||
cond_resched();
|
||||
}
|
||||
|
||||
ret = RESUME_GUEST;
|
||||
break;
|
||||
|
||||
case T_COP_UNUSABLE:
|
||||
kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
|
||||
|
||||
++vcpu->stat.cop_unusable_exits;
|
||||
trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
|
||||
/* XXXKYMA: Might need to return to user space */
|
||||
if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) {
|
||||
ret = RESUME_HOST;
|
||||
}
|
||||
break;
|
||||
|
||||
case T_TLB_MOD:
|
||||
++vcpu->stat.tlbmod_exits;
|
||||
trace_kvm_exit(vcpu, TLBMOD_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
|
||||
break;
|
||||
|
||||
case T_TLB_ST_MISS:
|
||||
kvm_debug
|
||||
("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
|
||||
cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
|
||||
badvaddr);
|
||||
|
||||
++vcpu->stat.tlbmiss_st_exits;
|
||||
trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
|
||||
break;
|
||||
|
||||
case T_TLB_LD_MISS:
|
||||
kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
|
||||
cause, opc, badvaddr);
|
||||
|
||||
++vcpu->stat.tlbmiss_ld_exits;
|
||||
trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
|
||||
break;
|
||||
|
||||
case T_ADDR_ERR_ST:
|
||||
++vcpu->stat.addrerr_st_exits;
|
||||
trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
|
||||
break;
|
||||
|
||||
case T_ADDR_ERR_LD:
|
||||
++vcpu->stat.addrerr_ld_exits;
|
||||
trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
|
||||
break;
|
||||
|
||||
case T_SYSCALL:
|
||||
++vcpu->stat.syscall_exits;
|
||||
trace_kvm_exit(vcpu, SYSCALL_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_syscall(vcpu);
|
||||
break;
|
||||
|
||||
case T_RES_INST:
|
||||
++vcpu->stat.resvd_inst_exits;
|
||||
trace_kvm_exit(vcpu, RESVD_INST_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_res_inst(vcpu);
|
||||
break;
|
||||
|
||||
case T_BREAK:
|
||||
++vcpu->stat.break_inst_exits;
|
||||
trace_kvm_exit(vcpu, BREAK_INST_EXITS);
|
||||
ret = kvm_mips_callbacks->handle_break(vcpu);
|
||||
break;
|
||||
|
||||
default:
|
||||
kvm_err
|
||||
("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n",
|
||||
exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
|
||||
kvm_read_c0_guest_status(vcpu->arch.cop0));
|
||||
kvm_arch_vcpu_dump_regs(vcpu);
|
||||
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
||||
ret = RESUME_HOST;
|
||||
break;
|
||||
|
||||
}
|
||||
|
||||
skip_emul:
|
||||
local_irq_disable();
|
||||
|
||||
if (er == EMULATE_DONE && !(ret & RESUME_HOST))
|
||||
kvm_mips_deliver_interrupts(vcpu, cause);
|
||||
|
||||
if (!(ret & RESUME_HOST)) {
|
||||
/* Only check for signals if not already exiting to userspace */
|
||||
if (signal_pending(current)) {
|
||||
run->exit_reason = KVM_EXIT_INTR;
|
||||
ret = (-EINTR << 2) | RESUME_HOST;
|
||||
++vcpu->stat.signal_exits;
|
||||
trace_kvm_exit(vcpu, SIGNAL_EXITS);
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int __init kvm_mips_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
|
||||
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* On MIPS, kernel modules are executed from "mapped space", which requires TLBs.
|
||||
* The TLB handling code is statically linked with the rest of the kernel (kvm_tlb.c)
|
||||
* to avoid the possibility of double faulting. The issue is that the TLB code
|
||||
* references routines that are part of the the KVM module,
|
||||
* which are only available once the module is loaded.
|
||||
*/
|
||||
kvm_mips_gfn_to_pfn = gfn_to_pfn;
|
||||
kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
|
||||
kvm_mips_is_error_pfn = is_error_pfn;
|
||||
|
||||
pr_info("KVM/MIPS Initialized\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
void __exit kvm_mips_exit(void)
|
||||
{
|
||||
kvm_exit();
|
||||
|
||||
kvm_mips_gfn_to_pfn = NULL;
|
||||
kvm_mips_release_pfn_clean = NULL;
|
||||
kvm_mips_is_error_pfn = NULL;
|
||||
|
||||
pr_info("KVM/MIPS unloaded\n");
|
||||
}
|
||||
|
||||
module_init(kvm_mips_init);
|
||||
module_exit(kvm_mips_exit);
|
||||
|
||||
EXPORT_TRACEPOINT_SYMBOL(kvm_exit);
|
||||
46
arch/mips/kvm/trace.h
Normal file
46
arch/mips/kvm/trace.h
Normal file
|
|
@ -0,0 +1,46 @@
|
|||
/*
|
||||
* 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.
|
||||
*
|
||||
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
|
||||
* Authors: Sanjay Lal <sanjayl@kymasys.com>
|
||||
*/
|
||||
|
||||
#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
|
||||
#define _TRACE_KVM_H
|
||||
|
||||
#include <linux/tracepoint.h>
|
||||
|
||||
#undef TRACE_SYSTEM
|
||||
#define TRACE_SYSTEM kvm
|
||||
#define TRACE_INCLUDE_PATH .
|
||||
#define TRACE_INCLUDE_FILE trace
|
||||
|
||||
/*
|
||||
* Tracepoints for VM eists
|
||||
*/
|
||||
extern char *kvm_mips_exit_types_str[MAX_KVM_MIPS_EXIT_TYPES];
|
||||
|
||||
TRACE_EVENT(kvm_exit,
|
||||
TP_PROTO(struct kvm_vcpu *vcpu, unsigned int reason),
|
||||
TP_ARGS(vcpu, reason),
|
||||
TP_STRUCT__entry(
|
||||
__field(struct kvm_vcpu *, vcpu)
|
||||
__field(unsigned int, reason)
|
||||
),
|
||||
|
||||
TP_fast_assign(
|
||||
__entry->vcpu = vcpu;
|
||||
__entry->reason = reason;
|
||||
),
|
||||
|
||||
TP_printk("[%s]PC: 0x%08lx",
|
||||
kvm_mips_exit_types_str[__entry->reason],
|
||||
__entry->vcpu->arch.pc)
|
||||
);
|
||||
|
||||
#endif /* _TRACE_KVM_H */
|
||||
|
||||
/* This part must be outside protection */
|
||||
#include <trace/define_trace.h>
|
||||
Loading…
Add table
Add a link
Reference in a new issue