forked from Minki/linux
891686188f
KVM on 440 has always been able to handle large guest mappings with 4K host pages -- we must, since the guest kernel uses 256MB mappings. This patch makes KVM work when the host has large pages too (tested with 64K). Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
552 lines
15 KiB
C
552 lines
15 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/cacheflush.h>
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#include "booke.h"
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#include "44x_tlb.h"
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unsigned long kvmppc_booke_handlers;
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#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
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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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{ "mmio", VCPU_STAT(mmio_exits) },
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{ "dcr", VCPU_STAT(dcr_exits) },
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{ "sig", VCPU_STAT(signal_exits) },
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{ "itlb_r", VCPU_STAT(itlb_real_miss_exits) },
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{ "itlb_v", VCPU_STAT(itlb_virt_miss_exits) },
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{ "dtlb_r", VCPU_STAT(dtlb_real_miss_exits) },
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{ "dtlb_v", VCPU_STAT(dtlb_virt_miss_exits) },
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{ "sysc", VCPU_STAT(syscall_exits) },
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{ "isi", VCPU_STAT(isi_exits) },
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{ "dsi", VCPU_STAT(dsi_exits) },
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{ "inst_emu", VCPU_STAT(emulated_inst_exits) },
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{ "dec", VCPU_STAT(dec_exits) },
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{ "ext_intr", VCPU_STAT(ext_intr_exits) },
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{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
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{ NULL }
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};
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/* TODO: use vcpu_printf() */
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void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
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{
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int i;
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printk("pc: %08lx msr: %08lx\n", vcpu->arch.pc, vcpu->arch.msr);
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printk("lr: %08lx ctr: %08lx\n", vcpu->arch.lr, vcpu->arch.ctr);
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printk("srr0: %08lx srr1: %08lx\n", vcpu->arch.srr0, vcpu->arch.srr1);
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printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
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for (i = 0; i < 32; i += 4) {
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printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i,
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vcpu->arch.gpr[i],
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vcpu->arch.gpr[i+1],
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vcpu->arch.gpr[i+2],
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vcpu->arch.gpr[i+3]);
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}
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}
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static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu,
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unsigned int priority)
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{
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set_bit(priority, &vcpu->arch.pending_exceptions);
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}
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void kvmppc_core_queue_program(struct kvm_vcpu *vcpu)
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{
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
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}
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void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
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{
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER);
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}
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int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
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{
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return test_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
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}
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void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
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struct kvm_interrupt *irq)
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{
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_EXTERNAL);
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}
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/* Deliver the interrupt of the corresponding priority, if possible. */
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static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
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unsigned int priority)
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{
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int allowed = 0;
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ulong msr_mask;
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switch (priority) {
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case BOOKE_IRQPRIO_PROGRAM:
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case BOOKE_IRQPRIO_DTLB_MISS:
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case BOOKE_IRQPRIO_ITLB_MISS:
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case BOOKE_IRQPRIO_SYSCALL:
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case BOOKE_IRQPRIO_DATA_STORAGE:
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case BOOKE_IRQPRIO_INST_STORAGE:
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case BOOKE_IRQPRIO_FP_UNAVAIL:
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case BOOKE_IRQPRIO_AP_UNAVAIL:
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case BOOKE_IRQPRIO_ALIGNMENT:
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allowed = 1;
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msr_mask = MSR_CE|MSR_ME|MSR_DE;
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break;
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case BOOKE_IRQPRIO_CRITICAL:
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case BOOKE_IRQPRIO_WATCHDOG:
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allowed = vcpu->arch.msr & MSR_CE;
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msr_mask = MSR_ME;
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break;
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case BOOKE_IRQPRIO_MACHINE_CHECK:
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allowed = vcpu->arch.msr & MSR_ME;
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msr_mask = 0;
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break;
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case BOOKE_IRQPRIO_EXTERNAL:
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case BOOKE_IRQPRIO_DECREMENTER:
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case BOOKE_IRQPRIO_FIT:
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allowed = vcpu->arch.msr & MSR_EE;
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msr_mask = MSR_CE|MSR_ME|MSR_DE;
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break;
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case BOOKE_IRQPRIO_DEBUG:
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allowed = vcpu->arch.msr & MSR_DE;
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msr_mask = MSR_ME;
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break;
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}
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if (allowed) {
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vcpu->arch.srr0 = vcpu->arch.pc;
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vcpu->arch.srr1 = vcpu->arch.msr;
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vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority];
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kvmppc_set_msr(vcpu, vcpu->arch.msr & msr_mask);
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clear_bit(priority, &vcpu->arch.pending_exceptions);
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}
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return allowed;
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}
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/* Check pending exceptions and deliver one, if possible. */
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void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
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{
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unsigned long *pending = &vcpu->arch.pending_exceptions;
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unsigned int priority;
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priority = __ffs(*pending);
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while (priority <= BOOKE_MAX_INTERRUPT) {
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if (kvmppc_booke_irqprio_deliver(vcpu, priority))
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break;
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priority = find_next_bit(pending,
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BITS_PER_BYTE * sizeof(*pending),
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priority + 1);
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}
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}
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/**
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* kvmppc_handle_exit
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*
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* Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
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*/
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int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
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unsigned int exit_nr)
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{
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enum emulation_result er;
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int r = RESUME_HOST;
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local_irq_enable();
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run->exit_reason = KVM_EXIT_UNKNOWN;
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run->ready_for_interrupt_injection = 1;
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switch (exit_nr) {
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case BOOKE_INTERRUPT_MACHINE_CHECK:
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printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
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kvmppc_dump_vcpu(vcpu);
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r = RESUME_HOST;
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break;
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case BOOKE_INTERRUPT_EXTERNAL:
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vcpu->stat.ext_intr_exits++;
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if (need_resched())
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cond_resched();
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r = RESUME_GUEST;
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break;
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case BOOKE_INTERRUPT_DECREMENTER:
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/* Since we switched IVPR back to the host's value, the host
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* handled this interrupt the moment we enabled interrupts.
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* Now we just offer it a chance to reschedule the guest. */
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/* XXX At this point the TLB still holds our shadow TLB, so if
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* we do reschedule the host will fault over it. Perhaps we
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* should politely restore the host's entries to minimize
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* misses before ceding control. */
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vcpu->stat.dec_exits++;
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if (need_resched())
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cond_resched();
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r = RESUME_GUEST;
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break;
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case BOOKE_INTERRUPT_PROGRAM:
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if (vcpu->arch.msr & MSR_PR) {
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/* Program traps generated by user-level software must be handled
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* by the guest kernel. */
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vcpu->arch.esr = vcpu->arch.fault_esr;
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
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r = RESUME_GUEST;
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break;
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}
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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
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* they were actually modified by emulation. */
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vcpu->stat.emulated_inst_exits++;
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r = RESUME_GUEST_NV;
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break;
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case EMULATE_DO_DCR:
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run->exit_reason = KVM_EXIT_DCR;
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vcpu->stat.dcr_exits++;
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r = RESUME_HOST;
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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_CRIT "%s: emulation at %lx failed (%08x)\n",
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__func__, vcpu->arch.pc, vcpu->arch.last_inst);
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/* For debugging, encode the failing instruction and
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* report it to userspace. */
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run->hw.hardware_exit_reason = ~0ULL << 32;
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run->hw.hardware_exit_reason |= 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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break;
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case BOOKE_INTERRUPT_FP_UNAVAIL:
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
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r = RESUME_GUEST;
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break;
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case BOOKE_INTERRUPT_DATA_STORAGE:
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vcpu->arch.dear = vcpu->arch.fault_dear;
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vcpu->arch.esr = vcpu->arch.fault_esr;
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
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vcpu->stat.dsi_exits++;
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r = RESUME_GUEST;
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break;
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case BOOKE_INTERRUPT_INST_STORAGE:
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vcpu->arch.esr = vcpu->arch.fault_esr;
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE);
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vcpu->stat.isi_exits++;
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r = RESUME_GUEST;
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break;
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case BOOKE_INTERRUPT_SYSCALL:
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL);
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vcpu->stat.syscall_exits++;
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r = RESUME_GUEST;
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break;
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case BOOKE_INTERRUPT_DTLB_MISS: {
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struct kvmppc_44x_tlbe *gtlbe;
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unsigned long eaddr = vcpu->arch.fault_dear;
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gfn_t gfn;
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/* Check the guest TLB. */
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gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr);
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if (!gtlbe) {
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/* The guest didn't have a mapping for it. */
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
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vcpu->arch.dear = vcpu->arch.fault_dear;
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vcpu->arch.esr = vcpu->arch.fault_esr;
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vcpu->stat.dtlb_real_miss_exits++;
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r = RESUME_GUEST;
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break;
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}
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vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr);
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gfn = vcpu->arch.paddr_accessed >> PAGE_SHIFT;
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if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
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/* The guest TLB had a mapping, but the shadow TLB
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* didn't, and it is RAM. This could be because:
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* a) the entry is mapping the host kernel, or
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* b) the guest used a large mapping which we're faking
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* Either way, we need to satisfy the fault without
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* invoking the guest. */
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kvmppc_mmu_map(vcpu, eaddr, vcpu->arch.paddr_accessed, gtlbe->tid,
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gtlbe->word2, get_tlb_bytes(gtlbe));
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vcpu->stat.dtlb_virt_miss_exits++;
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r = RESUME_GUEST;
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} else {
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/* Guest has mapped and accessed a page which is not
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* actually RAM. */
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r = kvmppc_emulate_mmio(run, vcpu);
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vcpu->stat.mmio_exits++;
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}
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break;
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}
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case BOOKE_INTERRUPT_ITLB_MISS: {
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struct kvmppc_44x_tlbe *gtlbe;
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unsigned long eaddr = vcpu->arch.pc;
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gpa_t gpaddr;
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gfn_t gfn;
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r = RESUME_GUEST;
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/* Check the guest TLB. */
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gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr);
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if (!gtlbe) {
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/* The guest didn't have a mapping for it. */
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
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vcpu->stat.itlb_real_miss_exits++;
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break;
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}
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vcpu->stat.itlb_virt_miss_exits++;
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gpaddr = tlb_xlate(gtlbe, eaddr);
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gfn = gpaddr >> PAGE_SHIFT;
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if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
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/* The guest TLB had a mapping, but the shadow TLB
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* didn't. This could be because:
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* a) the entry is mapping the host kernel, or
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* b) the guest used a large mapping which we're faking
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* Either way, we need to satisfy the fault without
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* invoking the guest. */
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kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlbe->tid,
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gtlbe->word2, get_tlb_bytes(gtlbe));
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} else {
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/* Guest mapped and leaped at non-RAM! */
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kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_MACHINE_CHECK);
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}
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break;
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}
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case BOOKE_INTERRUPT_DEBUG: {
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u32 dbsr;
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vcpu->arch.pc = mfspr(SPRN_CSRR0);
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/* clear IAC events in DBSR register */
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dbsr = mfspr(SPRN_DBSR);
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dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4;
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mtspr(SPRN_DBSR, dbsr);
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run->exit_reason = KVM_EXIT_DEBUG;
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r = RESUME_HOST;
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break;
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}
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default:
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printk(KERN_EMERG "exit_nr %d\n", exit_nr);
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BUG();
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}
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local_irq_disable();
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kvmppc_core_deliver_interrupts(vcpu);
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if (!(r & RESUME_HOST)) {
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/* To avoid clobbering exit_reason, only check for signals if
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* we aren't already exiting to userspace for some other
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* reason. */
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if (signal_pending(current)) {
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run->exit_reason = KVM_EXIT_INTR;
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r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
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vcpu->stat.signal_exits++;
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}
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}
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return r;
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}
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/* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
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int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.pc = 0;
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vcpu->arch.msr = 0;
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vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */
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vcpu->arch.shadow_pid = 1;
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/* Eye-catching number so we know if the guest takes an interrupt
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* before it's programmed its own IVPR. */
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vcpu->arch.ivpr = 0x55550000;
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return kvmppc_core_vcpu_setup(vcpu);
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}
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int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
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{
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int i;
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regs->pc = vcpu->arch.pc;
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regs->cr = vcpu->arch.cr;
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regs->ctr = vcpu->arch.ctr;
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regs->lr = vcpu->arch.lr;
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regs->xer = vcpu->arch.xer;
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regs->msr = vcpu->arch.msr;
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regs->srr0 = vcpu->arch.srr0;
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regs->srr1 = vcpu->arch.srr1;
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regs->pid = vcpu->arch.pid;
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regs->sprg0 = vcpu->arch.sprg0;
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regs->sprg1 = vcpu->arch.sprg1;
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regs->sprg2 = vcpu->arch.sprg2;
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regs->sprg3 = vcpu->arch.sprg3;
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regs->sprg5 = vcpu->arch.sprg4;
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regs->sprg6 = vcpu->arch.sprg5;
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regs->sprg7 = vcpu->arch.sprg6;
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for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
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regs->gpr[i] = vcpu->arch.gpr[i];
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return 0;
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}
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int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
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{
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int i;
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vcpu->arch.pc = regs->pc;
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vcpu->arch.cr = regs->cr;
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vcpu->arch.ctr = regs->ctr;
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vcpu->arch.lr = regs->lr;
|
|
vcpu->arch.xer = regs->xer;
|
|
kvmppc_set_msr(vcpu, regs->msr);
|
|
vcpu->arch.srr0 = regs->srr0;
|
|
vcpu->arch.srr1 = regs->srr1;
|
|
vcpu->arch.sprg0 = regs->sprg0;
|
|
vcpu->arch.sprg1 = regs->sprg1;
|
|
vcpu->arch.sprg2 = regs->sprg2;
|
|
vcpu->arch.sprg3 = regs->sprg3;
|
|
vcpu->arch.sprg5 = regs->sprg4;
|
|
vcpu->arch.sprg6 = regs->sprg5;
|
|
vcpu->arch.sprg7 = regs->sprg6;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++)
|
|
vcpu->arch.gpr[i] = regs->gpr[i];
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_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_ioctl_translate(struct kvm_vcpu *vcpu,
|
|
struct kvm_translation *tr)
|
|
{
|
|
return kvmppc_core_vcpu_translate(vcpu, tr);
|
|
}
|
|
|
|
int kvmppc_booke_init(void)
|
|
{
|
|
unsigned long ivor[16];
|
|
unsigned long max_ivor = 0;
|
|
int i;
|
|
|
|
/* We install our own exception handlers by hijacking IVPR. IVPR must
|
|
* be 16-bit aligned, so we need a 64KB allocation. */
|
|
kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
|
VCPU_SIZE_ORDER);
|
|
if (!kvmppc_booke_handlers)
|
|
return -ENOMEM;
|
|
|
|
/* XXX make sure our handlers are smaller than Linux's */
|
|
|
|
/* Copy our interrupt handlers to match host IVORs. That way we don't
|
|
* have to swap the IVORs on every guest/host transition. */
|
|
ivor[0] = mfspr(SPRN_IVOR0);
|
|
ivor[1] = mfspr(SPRN_IVOR1);
|
|
ivor[2] = mfspr(SPRN_IVOR2);
|
|
ivor[3] = mfspr(SPRN_IVOR3);
|
|
ivor[4] = mfspr(SPRN_IVOR4);
|
|
ivor[5] = mfspr(SPRN_IVOR5);
|
|
ivor[6] = mfspr(SPRN_IVOR6);
|
|
ivor[7] = mfspr(SPRN_IVOR7);
|
|
ivor[8] = mfspr(SPRN_IVOR8);
|
|
ivor[9] = mfspr(SPRN_IVOR9);
|
|
ivor[10] = mfspr(SPRN_IVOR10);
|
|
ivor[11] = mfspr(SPRN_IVOR11);
|
|
ivor[12] = mfspr(SPRN_IVOR12);
|
|
ivor[13] = mfspr(SPRN_IVOR13);
|
|
ivor[14] = mfspr(SPRN_IVOR14);
|
|
ivor[15] = mfspr(SPRN_IVOR15);
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
if (ivor[i] > max_ivor)
|
|
max_ivor = ivor[i];
|
|
|
|
memcpy((void *)kvmppc_booke_handlers + ivor[i],
|
|
kvmppc_handlers_start + i * kvmppc_handler_len,
|
|
kvmppc_handler_len);
|
|
}
|
|
flush_icache_range(kvmppc_booke_handlers,
|
|
kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __exit kvmppc_booke_exit(void)
|
|
{
|
|
free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
|
|
kvm_exit();
|
|
}
|