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-rw-r--r--arch/powerpc/kvm/book3s_hv.c445
1 files changed, 445 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
new file mode 100644
index 000000000000..60b7300568c8
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -0,0 +1,445 @@
+/*
+ * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
+ *
+ * Authors:
+ * Paul Mackerras <paulus@au1.ibm.com>
+ * Alexander Graf <agraf@suse.de>
+ * Kevin Wolf <mail@kevin-wolf.de>
+ *
+ * Description: KVM functions specific to running on Book 3S
+ * processors in hypervisor mode (specifically POWER7 and later).
+ *
+ * This file is derived from arch/powerpc/kvm/book3s.c,
+ * by Alexander Graf <agraf@suse.de>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/preempt.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/anon_inodes.h>
+#include <linux/cpumask.h>
+
+#include <asm/reg.h>
+#include <asm/cputable.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/kvm_ppc.h>
+#include <asm/kvm_book3s.h>
+#include <asm/mmu_context.h>
+#include <asm/lppaca.h>
+#include <asm/processor.h>
+#include <linux/gfp.h>
+#include <linux/sched.h>
+#include <linux/vmalloc.h>
+#include <linux/highmem.h>
+
+/* #define EXIT_DEBUG */
+/* #define EXIT_DEBUG_SIMPLE */
+/* #define EXIT_DEBUG_INT */
+
+void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ local_paca->kvm_hstate.kvm_vcpu = vcpu;
+}
+
+void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
+{
+}
+
+void kvmppc_vcpu_block(struct kvm_vcpu *vcpu)
+{
+ u64 now;
+ unsigned long dec_nsec;
+
+ now = get_tb();
+ if (now >= vcpu->arch.dec_expires && !kvmppc_core_pending_dec(vcpu))
+ kvmppc_core_queue_dec(vcpu);
+ if (vcpu->arch.pending_exceptions)
+ return;
+ if (vcpu->arch.dec_expires != ~(u64)0) {
+ dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC /
+ tb_ticks_per_sec;
+ hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
+ HRTIMER_MODE_REL);
+ }
+
+ kvm_vcpu_block(vcpu);
+ vcpu->stat.halt_wakeup++;
+
+ if (vcpu->arch.dec_expires != ~(u64)0)
+ hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
+}
+
+void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
+{
+ vcpu->arch.shregs.msr = msr;
+}
+
+void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
+{
+ vcpu->arch.pvr = pvr;
+}
+
+void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
+{
+ int r;
+
+ pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
+ pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
+ vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
+ for (r = 0; r < 16; ++r)
+ pr_err("r%2d = %.16lx r%d = %.16lx\n",
+ r, kvmppc_get_gpr(vcpu, r),
+ r+16, kvmppc_get_gpr(vcpu, r+16));
+ pr_err("ctr = %.16lx lr = %.16lx\n",
+ vcpu->arch.ctr, vcpu->arch.lr);
+ pr_err("srr0 = %.16llx srr1 = %.16llx\n",
+ vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
+ pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
+ vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
+ pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
+ vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
+ pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n",
+ vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
+ pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
+ pr_err("fault dar = %.16lx dsisr = %.8x\n",
+ vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
+ pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
+ for (r = 0; r < vcpu->arch.slb_max; ++r)
+ pr_err(" ESID = %.16llx VSID = %.16llx\n",
+ vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
+ pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
+ vcpu->arch.lpcr, vcpu->kvm->arch.sdr1,
+ vcpu->arch.last_inst);
+}
+
+static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
+ struct task_struct *tsk)
+{
+ int r = RESUME_HOST;
+
+ vcpu->stat.sum_exits++;
+
+ run->exit_reason = KVM_EXIT_UNKNOWN;
+ run->ready_for_interrupt_injection = 1;
+ switch (vcpu->arch.trap) {
+ /* We're good on these - the host merely wanted to get our attention */
+ case BOOK3S_INTERRUPT_HV_DECREMENTER:
+ vcpu->stat.dec_exits++;
+ r = RESUME_GUEST;
+ break;
+ case BOOK3S_INTERRUPT_EXTERNAL:
+ vcpu->stat.ext_intr_exits++;
+ r = RESUME_GUEST;
+ break;
+ case BOOK3S_INTERRUPT_PERFMON:
+ r = RESUME_GUEST;
+ break;
+ case BOOK3S_INTERRUPT_PROGRAM:
+ {
+ ulong flags;
+ /*
+ * Normally program interrupts are delivered directly
+ * to the guest by the hardware, but we can get here
+ * as a result of a hypervisor emulation interrupt
+ * (e40) getting turned into a 700 by BML RTAS.
+ */
+ flags = vcpu->arch.shregs.msr & 0x1f0000ull;
+ kvmppc_core_queue_program(vcpu, flags);
+ r = RESUME_GUEST;
+ break;
+ }
+ case BOOK3S_INTERRUPT_SYSCALL:
+ {
+ /* hcall - punt to userspace */
+ int i;
+
+ if (vcpu->arch.shregs.msr & MSR_PR) {
+ /* sc 1 from userspace - reflect to guest syscall */
+ kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
+ r = RESUME_GUEST;
+ break;
+ }
+ run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
+ for (i = 0; i < 9; ++i)
+ run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
+ run->exit_reason = KVM_EXIT_PAPR_HCALL;
+ vcpu->arch.hcall_needed = 1;
+ r = RESUME_HOST;
+ break;
+ }
+ /*
+ * We get these next two if the guest does a bad real-mode access,
+ * as we have enabled VRMA (virtualized real mode area) mode in the
+ * LPCR. We just generate an appropriate DSI/ISI to the guest.
+ */
+ case BOOK3S_INTERRUPT_H_DATA_STORAGE:
+ vcpu->arch.shregs.dsisr = vcpu->arch.fault_dsisr;
+ vcpu->arch.shregs.dar = vcpu->arch.fault_dar;
+ kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE, 0);
+ r = RESUME_GUEST;
+ break;
+ case BOOK3S_INTERRUPT_H_INST_STORAGE:
+ kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE,
+ 0x08000000);
+ r = RESUME_GUEST;
+ break;
+ /*
+ * This occurs if the guest executes an illegal instruction.
+ * We just generate a program interrupt to the guest, since
+ * we don't emulate any guest instructions at this stage.
+ */
+ case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
+ kvmppc_core_queue_program(vcpu, 0x80000);
+ r = RESUME_GUEST;
+ break;
+ default:
+ kvmppc_dump_regs(vcpu);
+ printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
+ vcpu->arch.trap, kvmppc_get_pc(vcpu),
+ vcpu->arch.shregs.msr);
+ r = RESUME_HOST;
+ BUG();
+ break;
+ }
+
+
+ if (!(r & RESUME_HOST)) {
+ /* To avoid clobbering exit_reason, only check for signals if
+ * we aren't already exiting to userspace for some other
+ * reason. */
+ if (signal_pending(tsk)) {
+ vcpu->stat.signal_exits++;
+ run->exit_reason = KVM_EXIT_INTR;
+ r = -EINTR;
+ } else {
+ kvmppc_core_deliver_interrupts(vcpu);
+ }
+ }
+
+ return r;
+}
+
+int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
+ struct kvm_sregs *sregs)
+{
+ int i;
+
+ sregs->pvr = vcpu->arch.pvr;
+
+ memset(sregs, 0, sizeof(struct kvm_sregs));
+ for (i = 0; i < vcpu->arch.slb_max; i++) {
+ sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
+ sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
+ }
+
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
+ struct kvm_sregs *sregs)
+{
+ int i, j;
+
+ kvmppc_set_pvr(vcpu, sregs->pvr);
+
+ j = 0;
+ for (i = 0; i < vcpu->arch.slb_nr; i++) {
+ if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
+ vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
+ vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
+ ++j;
+ }
+ }
+ vcpu->arch.slb_max = j;
+
+ return 0;
+}
+
+int kvmppc_core_check_processor_compat(void)
+{
+ if (cpu_has_feature(CPU_FTR_HVMODE_206))
+ return 0;
+ return -EIO;
+}
+
+struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
+{
+ struct kvm_vcpu *vcpu;
+ int err = -ENOMEM;
+ unsigned long lpcr;
+
+ vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
+ if (!vcpu)
+ goto out;
+
+ err = kvm_vcpu_init(vcpu, kvm, id);
+ if (err)
+ goto free_vcpu;
+
+ vcpu->arch.shared = &vcpu->arch.shregs;
+ vcpu->arch.last_cpu = -1;
+ vcpu->arch.mmcr[0] = MMCR0_FC;
+ vcpu->arch.ctrl = CTRL_RUNLATCH;
+ /* default to host PVR, since we can't spoof it */
+ vcpu->arch.pvr = mfspr(SPRN_PVR);
+ kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
+
+ lpcr = kvm->arch.host_lpcr & (LPCR_PECE | LPCR_LPES);
+ lpcr |= LPCR_VPM0 | LPCR_VRMA_L | (4UL << LPCR_DPFD_SH) | LPCR_HDICE;
+ vcpu->arch.lpcr = lpcr;
+
+ kvmppc_mmu_book3s_hv_init(vcpu);
+
+ return vcpu;
+
+free_vcpu:
+ kfree(vcpu);
+out:
+ return ERR_PTR(err);
+}
+
+void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
+{
+ kvm_vcpu_uninit(vcpu);
+ kfree(vcpu);
+}
+
+extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
+
+int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
+{
+ u64 now;
+
+ if (signal_pending(current)) {
+ run->exit_reason = KVM_EXIT_INTR;
+ return -EINTR;
+ }
+
+ flush_fp_to_thread(current);
+ flush_altivec_to_thread(current);
+ flush_vsx_to_thread(current);
+ preempt_disable();
+
+ /*
+ * Make sure we are running on thread 0, and that
+ * secondary threads are offline.
+ * XXX we should also block attempts to bring any
+ * secondary threads online.
+ */
+ if (threads_per_core > 1) {
+ int cpu = smp_processor_id();
+ int thr = cpu_thread_in_core(cpu);
+
+ if (thr)
+ goto out;
+ while (++thr < threads_per_core)
+ if (cpu_online(cpu + thr))
+ goto out;
+ }
+
+ kvm_guest_enter();
+
+ __kvmppc_vcore_entry(NULL, vcpu);
+
+ kvm_guest_exit();
+
+ preempt_enable();
+ kvm_resched(vcpu);
+
+ now = get_tb();
+ /* cancel pending dec exception if dec is positive */
+ if (now < vcpu->arch.dec_expires && kvmppc_core_pending_dec(vcpu))
+ kvmppc_core_dequeue_dec(vcpu);
+
+ return kvmppc_handle_exit(run, vcpu, current);
+
+ out:
+ preempt_enable();
+ return -EBUSY;
+}
+
+int kvmppc_core_prepare_memory_region(struct kvm *kvm,
+ struct kvm_userspace_memory_region *mem)
+{
+ if (mem->guest_phys_addr == 0 && mem->memory_size != 0)
+ return kvmppc_prepare_vrma(kvm, mem);
+ return 0;
+}
+
+void kvmppc_core_commit_memory_region(struct kvm *kvm,
+ struct kvm_userspace_memory_region *mem)
+{
+ if (mem->guest_phys_addr == 0 && mem->memory_size != 0)
+ kvmppc_map_vrma(kvm, mem);
+}
+
+int kvmppc_core_init_vm(struct kvm *kvm)
+{
+ long r;
+
+ /* Allocate hashed page table */
+ r = kvmppc_alloc_hpt(kvm);
+
+ return r;
+}
+
+void kvmppc_core_destroy_vm(struct kvm *kvm)
+{
+ kvmppc_free_hpt(kvm);
+}
+
+/* These are stubs for now */
+void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
+{
+}
+
+/* We don't need to emulate any privileged instructions or dcbz */
+int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
+ unsigned int inst, int *advance)
+{
+ return EMULATE_FAIL;
+}
+
+int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
+{
+ return EMULATE_FAIL;
+}
+
+int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
+{
+ return EMULATE_FAIL;
+}
+
+static int kvmppc_book3s_hv_init(void)
+{
+ int r;
+
+ r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+
+ if (r)
+ return r;
+
+ r = kvmppc_mmu_hv_init();
+
+ return r;
+}
+
+static void kvmppc_book3s_hv_exit(void)
+{
+ kvm_exit();
+}
+
+module_init(kvmppc_book3s_hv_init);
+module_exit(kvmppc_book3s_hv_exit);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 19:49:13 +0100