455 lines
9.7 KiB
C
455 lines
9.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright IBM Corp. 2007
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.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/kvm_host.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 <asm/cputable.h>
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#include <asm/uaccess.h>
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#include <asm/kvm_ppc.h>
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#include <asm/tlbflush.h>
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#include "timing.h"
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#include "../mm/mmu_decl.h"
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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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int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
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{
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return !!(v->arch.pending_exceptions);
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}
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int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
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{
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return !(v->arch.msr & MSR_WE);
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}
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int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
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{
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enum emulation_result er;
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int r;
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er = kvmppc_emulate_instruction(run, vcpu);
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switch (er) {
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case EMULATE_DONE:
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/* Future optimization: only reload non-volatiles if they were
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* actually modified. */
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r = RESUME_GUEST_NV;
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break;
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case EMULATE_DO_MMIO:
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run->exit_reason = KVM_EXIT_MMIO;
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/* We must reload nonvolatiles because "update" load/store
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* instructions modify register state. */
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/* Future optimization: only reload non-volatiles if they were
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* actually modified. */
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r = RESUME_HOST_NV;
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break;
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case EMULATE_FAIL:
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/* XXX Deliver Program interrupt to guest. */
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printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
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vcpu->arch.last_inst);
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r = RESUME_HOST;
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break;
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default:
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BUG();
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}
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return r;
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}
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void kvm_arch_hardware_enable(void *garbage)
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{
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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 *)rtn = kvmppc_core_check_processor_compat();
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}
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struct kvm *kvm_arch_create_vm(void)
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{
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struct kvm *kvm;
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kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
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if (!kvm)
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return ERR_PTR(-ENOMEM);
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return kvm;
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}
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static void kvmppc_free_vcpus(struct kvm *kvm)
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{
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unsigned int i;
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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if (kvm->vcpus[i]) {
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kvm_arch_vcpu_free(kvm->vcpus[i]);
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kvm->vcpus[i] = NULL;
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}
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}
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}
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void kvm_arch_destroy_vm(struct kvm *kvm)
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{
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kvmppc_free_vcpus(kvm);
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kvm_free_physmem(kvm);
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kfree(kvm);
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}
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int kvm_dev_ioctl_check_extension(long ext)
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{
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int r;
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switch (ext) {
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case KVM_CAP_COALESCED_MMIO:
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r = KVM_COALESCED_MMIO_PAGE_OFFSET;
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break;
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default:
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r = 0;
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break;
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}
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return r;
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}
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long kvm_arch_dev_ioctl(struct file *filp,
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unsigned int ioctl, unsigned long arg)
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{
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return -EINVAL;
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}
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int kvm_arch_set_memory_region(struct kvm *kvm,
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struct kvm_userspace_memory_region *mem,
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struct kvm_memory_slot old,
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int user_alloc)
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{
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return 0;
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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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struct kvm_vcpu *vcpu;
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vcpu = kvmppc_core_vcpu_create(kvm, id);
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kvmppc_create_vcpu_debugfs(vcpu, id);
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return vcpu;
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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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kvmppc_remove_vcpu_debugfs(vcpu);
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kvmppc_core_vcpu_free(vcpu);
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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 kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
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{
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return kvmppc_core_pending_dec(vcpu);
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}
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static void kvmppc_decrementer_func(unsigned long data)
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{
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struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
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kvmppc_core_queue_dec(vcpu);
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if (waitqueue_active(&vcpu->wq)) {
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wake_up_interruptible(&vcpu->wq);
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vcpu->stat.halt_wakeup++;
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}
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}
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int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
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{
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setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
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(unsigned long)vcpu);
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return 0;
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}
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void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
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{
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kvmppc_core_destroy_mmu(vcpu);
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}
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void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
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{
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if (vcpu->guest_debug.enabled)
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kvmppc_core_load_guest_debugstate(vcpu);
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kvmppc_core_vcpu_load(vcpu, cpu);
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}
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void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
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{
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if (vcpu->guest_debug.enabled)
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kvmppc_core_load_host_debugstate(vcpu);
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/* Don't leave guest TLB entries resident when being de-scheduled. */
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/* XXX It would be nice to differentiate between heavyweight exit and
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* sched_out here, since we could avoid the TLB flush for heavyweight
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* exits. */
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_tlbil_all();
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kvmppc_core_vcpu_put(vcpu);
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}
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int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
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struct kvm_debug_guest *dbg)
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{
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int i;
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vcpu->guest_debug.enabled = dbg->enabled;
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if (vcpu->guest_debug.enabled) {
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for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
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if (dbg->breakpoints[i].enabled)
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vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
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else
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vcpu->guest_debug.bp[i] = 0;
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}
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}
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return 0;
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}
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static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
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struct kvm_run *run)
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{
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ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
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*gpr = run->dcr.data;
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}
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static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
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struct kvm_run *run)
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{
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ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
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if (run->mmio.len > sizeof(*gpr)) {
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printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
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return;
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}
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if (vcpu->arch.mmio_is_bigendian) {
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switch (run->mmio.len) {
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case 4: *gpr = *(u32 *)run->mmio.data; break;
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case 2: *gpr = *(u16 *)run->mmio.data; break;
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case 1: *gpr = *(u8 *)run->mmio.data; break;
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}
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} else {
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/* Convert BE data from userland back to LE. */
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switch (run->mmio.len) {
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case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
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case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
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case 1: *gpr = *(u8 *)run->mmio.data; break;
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}
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}
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}
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int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
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unsigned int rt, unsigned int bytes, int is_bigendian)
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{
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if (bytes > sizeof(run->mmio.data)) {
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printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
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run->mmio.len);
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}
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run->mmio.phys_addr = vcpu->arch.paddr_accessed;
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run->mmio.len = bytes;
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run->mmio.is_write = 0;
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vcpu->arch.io_gpr = rt;
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vcpu->arch.mmio_is_bigendian = is_bigendian;
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vcpu->mmio_needed = 1;
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vcpu->mmio_is_write = 0;
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return EMULATE_DO_MMIO;
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}
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int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
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u32 val, unsigned int bytes, int is_bigendian)
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{
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void *data = run->mmio.data;
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if (bytes > sizeof(run->mmio.data)) {
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printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
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run->mmio.len);
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}
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run->mmio.phys_addr = vcpu->arch.paddr_accessed;
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run->mmio.len = bytes;
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run->mmio.is_write = 1;
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vcpu->mmio_needed = 1;
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vcpu->mmio_is_write = 1;
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/* Store the value at the lowest bytes in 'data'. */
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if (is_bigendian) {
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switch (bytes) {
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case 4: *(u32 *)data = val; break;
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case 2: *(u16 *)data = val; break;
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case 1: *(u8 *)data = val; break;
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}
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} else {
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/* Store LE value into 'data'. */
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switch (bytes) {
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case 4: st_le32(data, val); break;
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case 2: st_le16(data, val); break;
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case 1: *(u8 *)data = val; break;
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}
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}
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return EMULATE_DO_MMIO;
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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;
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sigset_t sigsaved;
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vcpu_load(vcpu);
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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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kvmppc_complete_mmio_load(vcpu, run);
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vcpu->mmio_needed = 0;
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} else if (vcpu->arch.dcr_needed) {
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if (!vcpu->arch.dcr_is_write)
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kvmppc_complete_dcr_load(vcpu, run);
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vcpu->arch.dcr_needed = 0;
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}
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kvmppc_core_deliver_interrupts(vcpu);
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local_irq_disable();
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kvm_guest_enter();
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r = __kvmppc_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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vcpu_put(vcpu);
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return r;
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}
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int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
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{
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kvmppc_core_queue_external(vcpu, irq);
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if (waitqueue_active(&vcpu->wq)) {
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wake_up_interruptible(&vcpu->wq);
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vcpu->stat.halt_wakeup++;
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}
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return 0;
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}
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int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
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struct kvm_mp_state *mp_state)
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{
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return -EINVAL;
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}
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int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
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struct kvm_mp_state *mp_state)
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{
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return -EINVAL;
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}
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long kvm_arch_vcpu_ioctl(struct file *filp,
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unsigned int ioctl, unsigned long arg)
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{
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struct kvm_vcpu *vcpu = filp->private_data;
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void __user *argp = (void __user *)arg;
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long r;
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switch (ioctl) {
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case KVM_INTERRUPT: {
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struct kvm_interrupt irq;
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r = -EFAULT;
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if (copy_from_user(&irq, argp, sizeof(irq)))
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goto out;
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r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
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break;
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}
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default:
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r = -EINVAL;
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}
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out:
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return r;
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}
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int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
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{
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return -ENOTSUPP;
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}
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long kvm_arch_vm_ioctl(struct file *filp,
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unsigned int ioctl, unsigned long arg)
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{
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long r;
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switch (ioctl) {
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default:
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r = -EINVAL;
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}
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return r;
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}
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int kvm_arch_init(void *opaque)
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{
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return 0;
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}
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void kvm_arch_exit(void)
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{
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}
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