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linux/arch/powerpc/kvm/book3s_hv.c
Paul Mackerras 9e368f2915 KVM: PPC: book3s_hv: Add support for PPC970-family processors 
This adds support for running KVM guests in supervisor mode on those
PPC970 processors that have a usable hypervisor mode.  Unfortunately,
Apple G5 machines have supervisor mode disabled (MSR[HV] is forced to
1), but the YDL PowerStation does have a usable hypervisor mode.

There are several differences between the PPC970 and POWER7 in how
guests are managed.  These differences are accommodated using the
CPU_FTR_ARCH_201 (PPC970) and CPU_FTR_ARCH_206 (POWER7) CPU feature
bits.  Notably, on PPC970:

* The LPCR, LPID or RMOR registers don't exist, and the functions of
  those registers are provided by bits in HID4 and one bit in HID0.

* External interrupts can be directed to the hypervisor, but unlike
  POWER7 they are masked by MSR[EE] in non-hypervisor modes and use
  SRR0/1 not HSRR0/1.

* There is no virtual RMA (VRMA) mode; the guest must use an RMO
  (real mode offset) area.

* The TLB entries are not tagged with the LPID, so it is necessary to
  flush the whole TLB on partition switch.  Furthermore, when switching
  partitions we have to ensure that no other CPU is executing the tlbie
  or tlbsync instructions in either the old or the new partition,
  otherwise undefined behaviour can occur.

* The PMU has 8 counters (PMC registers) rather than 6.

* The DSCR, PURR, SPURR, AMR, AMOR, UAMOR registers don't exist.

* The SLB has 64 entries rather than 32.

* There is no mediated external interrupt facility, so if we switch to
  a guest that has a virtual external interrupt pending but the guest
  has MSR[EE] = 0, we have to arrange to have an interrupt pending for
  it so that we can get control back once it re-enables interrupts.  We
  do that by sending ourselves an IPI with smp_send_reschedule after
  hard-disabling interrupts.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2011-07-12 13:16:59 +03:00

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/*
* 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 <linux/spinlock.h>
#include <linux/page-flags.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 <asm/cputhreads.h>
#include <asm/page.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
/*
* For now, limit memory to 64GB and require it to be large pages.
* This value is chosen because it makes the ram_pginfo array be
* 64kB in size, which is about as large as we want to be trying
* to allocate with kmalloc.
*/
#define MAX_MEM_ORDER 36
#define LARGE_PAGE_ORDER 24 /* 16MB pages */
/* #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;
local_paca->kvm_hstate.kvm_vcore = vcpu->arch.vcore;
}
void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
}
static void kvmppc_vcpu_blocked(struct kvm_vcpu *vcpu);
static void kvmppc_vcpu_unblocked(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);
}
kvmppc_vcpu_blocked(vcpu);
kvm_vcpu_block(vcpu);
vcpu->stat.halt_wakeup++;
if (vcpu->arch.dec_expires != ~(u64)0)
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
kvmppc_vcpu_unblocked(vcpu);
}
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->kvm->arch.lpcr, vcpu->kvm->arch.sdr1,
vcpu->arch.last_inst);
}
struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
{
int r;
struct kvm_vcpu *v, *ret = NULL;
mutex_lock(&kvm->lock);
kvm_for_each_vcpu(r, v, kvm) {
if (v->vcpu_id == id) {
ret = v;
break;
}
}
mutex_unlock(&kvm->lock);
return ret;
}
static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
{
vpa->shared_proc = 1;
vpa->yield_count = 1;
}
static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
unsigned long flags,
unsigned long vcpuid, unsigned long vpa)
{
struct kvm *kvm = vcpu->kvm;
unsigned long pg_index, ra, len;
unsigned long pg_offset;
void *va;
struct kvm_vcpu *tvcpu;
tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
if (!tvcpu)
return H_PARAMETER;
flags >>= 63 - 18;
flags &= 7;
if (flags == 0 || flags == 4)
return H_PARAMETER;
if (flags < 4) {
if (vpa & 0x7f)
return H_PARAMETER;
/* registering new area; convert logical addr to real */
pg_index = vpa >> kvm->arch.ram_porder;
pg_offset = vpa & (kvm->arch.ram_psize - 1);
if (pg_index >= kvm->arch.ram_npages)
return H_PARAMETER;
if (kvm->arch.ram_pginfo[pg_index].pfn == 0)
return H_PARAMETER;
ra = kvm->arch.ram_pginfo[pg_index].pfn << PAGE_SHIFT;
ra |= pg_offset;
va = __va(ra);
if (flags <= 1)
len = *(unsigned short *)(va + 4);
else
len = *(unsigned int *)(va + 4);
if (pg_offset + len > kvm->arch.ram_psize)
return H_PARAMETER;
switch (flags) {
case 1: /* register VPA */
if (len < 640)
return H_PARAMETER;
tvcpu->arch.vpa = va;
init_vpa(vcpu, va);
break;
case 2: /* register DTL */
if (len < 48)
return H_PARAMETER;
if (!tvcpu->arch.vpa)
return H_RESOURCE;
len -= len % 48;
tvcpu->arch.dtl = va;
tvcpu->arch.dtl_end = va + len;
break;
case 3: /* register SLB shadow buffer */
if (len < 8)
return H_PARAMETER;
if (!tvcpu->arch.vpa)
return H_RESOURCE;
tvcpu->arch.slb_shadow = va;
len = (len - 16) / 16;
tvcpu->arch.slb_shadow = va;
break;
}
} else {
switch (flags) {
case 5: /* unregister VPA */
if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
return H_RESOURCE;
tvcpu->arch.vpa = NULL;
break;
case 6: /* unregister DTL */
tvcpu->arch.dtl = NULL;
break;
case 7: /* unregister SLB shadow buffer */
tvcpu->arch.slb_shadow = NULL;
break;
}
}
return H_SUCCESS;
}
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
{
unsigned long req = kvmppc_get_gpr(vcpu, 3);
unsigned long target, ret = H_SUCCESS;
struct kvm_vcpu *tvcpu;
switch (req) {
case H_CEDE:
vcpu->arch.shregs.msr |= MSR_EE;
vcpu->arch.ceded = 1;
smp_mb();
if (!vcpu->arch.prodded)
kvmppc_vcpu_block(vcpu);
else
vcpu->arch.prodded = 0;
smp_mb();
vcpu->arch.ceded = 0;
break;
case H_PROD:
target = kvmppc_get_gpr(vcpu, 4);
tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
if (!tvcpu) {
ret = H_PARAMETER;
break;
}
tvcpu->arch.prodded = 1;
smp_mb();
if (vcpu->arch.ceded) {
if (waitqueue_active(&vcpu->wq)) {
wake_up_interruptible(&vcpu->wq);
vcpu->stat.halt_wakeup++;
}
}
break;
case H_CONFER:
break;
case H_REGISTER_VPA:
ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
default:
return RESUME_HOST;
}
kvmppc_set_gpr(vcpu, 3, ret);
vcpu->arch.hcall_needed = 0;
return RESUME_GUEST;
}
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))
return 0;
return -EIO;
}
struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
{
struct kvm_vcpu *vcpu;
int err = -EINVAL;
int core;
struct kvmppc_vcore *vcore;
core = id / threads_per_core;
if (core >= KVM_MAX_VCORES)
goto out;
err = -ENOMEM;
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);
kvmppc_mmu_book3s_hv_init(vcpu);
/*
* Some vcpus may start out in stopped state. If we initialize
* them to busy-in-host state they will stop other vcpus in the
* vcore from running. Instead we initialize them to blocked
* state, effectively considering them to be stopped until we
* see the first run ioctl for them.
*/
vcpu->arch.state = KVMPPC_VCPU_BLOCKED;
init_waitqueue_head(&vcpu->arch.cpu_run);
mutex_lock(&kvm->lock);
vcore = kvm->arch.vcores[core];
if (!vcore) {
vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
if (vcore) {
INIT_LIST_HEAD(&vcore->runnable_threads);
spin_lock_init(&vcore->lock);
}
kvm->arch.vcores[core] = vcore;
}
mutex_unlock(&kvm->lock);
if (!vcore)
goto free_vcpu;
spin_lock(&vcore->lock);
++vcore->num_threads;
++vcore->n_blocked;
spin_unlock(&vcore->lock);
vcpu->arch.vcore = vcore;
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);
}
static void kvmppc_vcpu_blocked(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
spin_lock(&vc->lock);
vcpu->arch.state = KVMPPC_VCPU_BLOCKED;
++vc->n_blocked;
if (vc->n_runnable > 0 &&
vc->n_runnable + vc->n_blocked == vc->num_threads) {
vcpu = list_first_entry(&vc->runnable_threads, struct kvm_vcpu,
arch.run_list);
wake_up(&vcpu->arch.cpu_run);
}
spin_unlock(&vc->lock);
}
static void kvmppc_vcpu_unblocked(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
spin_lock(&vc->lock);
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
--vc->n_blocked;
spin_unlock(&vc->lock);
}
extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
extern void xics_wake_cpu(int cpu);
static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
struct kvm_vcpu *vcpu)
{
struct kvm_vcpu *v;
if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
return;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
--vc->n_runnable;
/* decrement the physical thread id of each following vcpu */
v = vcpu;
list_for_each_entry_continue(v, &vc->runnable_threads, arch.run_list)
--v->arch.ptid;
list_del(&vcpu->arch.run_list);
}
static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
{
int cpu;
struct paca_struct *tpaca;
struct kvmppc_vcore *vc = vcpu->arch.vcore;
cpu = vc->pcpu + vcpu->arch.ptid;
tpaca = &paca[cpu];
tpaca->kvm_hstate.kvm_vcpu = vcpu;
tpaca->kvm_hstate.kvm_vcore = vc;
smp_wmb();
#ifdef CONFIG_PPC_ICP_NATIVE
if (vcpu->arch.ptid) {
tpaca->cpu_start = 0x80;
tpaca->kvm_hstate.in_guest = KVM_GUEST_MODE_GUEST;
wmb();
xics_wake_cpu(cpu);
++vc->n_woken;
}
#endif
}
static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
{
int i;
HMT_low();
i = 0;
while (vc->nap_count < vc->n_woken) {
if (++i >= 1000000) {
pr_err("kvmppc_wait_for_nap timeout %d %d\n",
vc->nap_count, vc->n_woken);
break;
}
cpu_relax();
}
HMT_medium();
}
/*
* Check that we are on thread 0 and that any other threads in
* this core are off-line.
*/
static int on_primary_thread(void)
{
int cpu = smp_processor_id();
int thr = cpu_thread_in_core(cpu);
if (thr)
return 0;
while (++thr < threads_per_core)
if (cpu_online(cpu + thr))
return 0;
return 1;
}
/*
* Run a set of guest threads on a physical core.
* Called with vc->lock held.
*/
static int kvmppc_run_core(struct kvmppc_vcore *vc)
{
struct kvm_vcpu *vcpu, *vnext;
long ret;
u64 now;
/* don't start if any threads have a signal pending */
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
if (signal_pending(vcpu->arch.run_task))
return 0;
/*
* 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 && !on_primary_thread()) {
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
vcpu->arch.ret = -EBUSY;
goto out;
}
vc->n_woken = 0;
vc->nap_count = 0;
vc->entry_exit_count = 0;
vc->vcore_running = 1;
vc->in_guest = 0;
vc->pcpu = smp_processor_id();
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
kvmppc_start_thread(vcpu);
vcpu = list_first_entry(&vc->runnable_threads, struct kvm_vcpu,
arch.run_list);
spin_unlock(&vc->lock);
preempt_disable();
kvm_guest_enter();
__kvmppc_vcore_entry(NULL, vcpu);
/* wait for secondary threads to finish writing their state to memory */
spin_lock(&vc->lock);
if (vc->nap_count < vc->n_woken)
kvmppc_wait_for_nap(vc);
/* prevent other vcpu threads from doing kvmppc_start_thread() now */
vc->vcore_running = 2;
spin_unlock(&vc->lock);
/* make sure updates to secondary vcpu structs are visible now */
smp_mb();
kvm_guest_exit();
preempt_enable();
kvm_resched(vcpu);
now = get_tb();
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
/* cancel pending dec exception if dec is positive */
if (now < vcpu->arch.dec_expires &&
kvmppc_core_pending_dec(vcpu))
kvmppc_core_dequeue_dec(vcpu);
if (!vcpu->arch.trap) {
if (signal_pending(vcpu->arch.run_task)) {
vcpu->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
}
continue; /* didn't get to run */
}
ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu,
vcpu->arch.run_task);
vcpu->arch.ret = ret;
vcpu->arch.trap = 0;
}
spin_lock(&vc->lock);
out:
vc->vcore_running = 0;
list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
arch.run_list) {
if (vcpu->arch.ret != RESUME_GUEST) {
kvmppc_remove_runnable(vc, vcpu);
wake_up(&vcpu->arch.cpu_run);
}
}
return 1;
}
static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
int ptid;
int wait_state;
struct kvmppc_vcore *vc;
DEFINE_WAIT(wait);
/* No need to go into the guest when all we do is going out */
if (signal_pending(current)) {
kvm_run->exit_reason = KVM_EXIT_INTR;
return -EINTR;
}
/* On PPC970, check that we have an RMA region */
if (!vcpu->kvm->arch.rma && cpu_has_feature(CPU_FTR_ARCH_201))
return -EPERM;
kvm_run->exit_reason = 0;
vcpu->arch.ret = RESUME_GUEST;
vcpu->arch.trap = 0;
flush_fp_to_thread(current);
flush_altivec_to_thread(current);
flush_vsx_to_thread(current);
/*
* Synchronize with other threads in this virtual core
*/
vc = vcpu->arch.vcore;
spin_lock(&vc->lock);
/* This happens the first time this is called for a vcpu */
if (vcpu->arch.state == KVMPPC_VCPU_BLOCKED)
--vc->n_blocked;
vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
ptid = vc->n_runnable;
vcpu->arch.run_task = current;
vcpu->arch.kvm_run = kvm_run;
vcpu->arch.ptid = ptid;
list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
++vc->n_runnable;
wait_state = TASK_INTERRUPTIBLE;
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
if (signal_pending(current)) {
if (!vc->vcore_running) {
kvm_run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
break;
}
/* have to wait for vcore to stop executing guest */
wait_state = TASK_UNINTERRUPTIBLE;
smp_send_reschedule(vc->pcpu);
}
if (!vc->vcore_running &&
vc->n_runnable + vc->n_blocked == vc->num_threads) {
/* we can run now */
if (kvmppc_run_core(vc))
continue;
}
if (vc->vcore_running == 1 && VCORE_EXIT_COUNT(vc) == 0)
kvmppc_start_thread(vcpu);
/* wait for other threads to come in, or wait for vcore */
prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
spin_unlock(&vc->lock);
schedule();
finish_wait(&vcpu->arch.cpu_run, &wait);
spin_lock(&vc->lock);
}
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
kvmppc_remove_runnable(vc, vcpu);
spin_unlock(&vc->lock);
return vcpu->arch.ret;
}
int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
int r;
do {
r = kvmppc_run_vcpu(run, vcpu);
if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
!(vcpu->arch.shregs.msr & MSR_PR)) {
r = kvmppc_pseries_do_hcall(vcpu);
kvmppc_core_deliver_interrupts(vcpu);
}
} while (r == RESUME_GUEST);
return r;
}
static long kvmppc_stt_npages(unsigned long window_size)
{
return ALIGN((window_size >> SPAPR_TCE_SHIFT)
* sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
}
static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
{
struct kvm *kvm = stt->kvm;
int i;
mutex_lock(&kvm->lock);
list_del(&stt->list);
for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
__free_page(stt->pages[i]);
kfree(stt);
mutex_unlock(&kvm->lock);
kvm_put_kvm(kvm);
}
static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
struct page *page;
if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size))
return VM_FAULT_SIGBUS;
page = stt->pages[vmf->pgoff];
get_page(page);
vmf->page = page;
return 0;
}
static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
.fault = kvm_spapr_tce_fault,
};
static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
{
vma->vm_ops = &kvm_spapr_tce_vm_ops;
return 0;
}
static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
{
struct kvmppc_spapr_tce_table *stt = filp->private_data;
release_spapr_tce_table(stt);
return 0;
}
static struct file_operations kvm_spapr_tce_fops = {
.mmap = kvm_spapr_tce_mmap,
.release = kvm_spapr_tce_release,
};
long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
struct kvm_create_spapr_tce *args)
{
struct kvmppc_spapr_tce_table *stt = NULL;
long npages;
int ret = -ENOMEM;
int i;
/* Check this LIOBN hasn't been previously allocated */
list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
if (stt->liobn == args->liobn)
return -EBUSY;
}
npages = kvmppc_stt_npages(args->window_size);
stt = kzalloc(sizeof(*stt) + npages* sizeof(struct page *),
GFP_KERNEL);
if (!stt)
goto fail;
stt->liobn = args->liobn;
stt->window_size = args->window_size;
stt->kvm = kvm;
for (i = 0; i < npages; i++) {
stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!stt->pages[i])
goto fail;
}
kvm_get_kvm(kvm);
mutex_lock(&kvm->lock);
list_add(&stt->list, &kvm->arch.spapr_tce_tables);
mutex_unlock(&kvm->lock);
return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
stt, O_RDWR);
fail:
if (stt) {
for (i = 0; i < npages; i++)
if (stt->pages[i])
__free_page(stt->pages[i]);
kfree(stt);
}
return ret;
}
/* Work out RMLS (real mode limit selector) field value for a given RMA size.
Assumes POWER7 or PPC970. */
static inline int lpcr_rmls(unsigned long rma_size)
{
switch (rma_size) {
case 32ul << 20: /* 32 MB */
if (cpu_has_feature(CPU_FTR_ARCH_206))
return 8; /* only supported on POWER7 */
return -1;
case 64ul << 20: /* 64 MB */
return 3;
case 128ul << 20: /* 128 MB */
return 7;
case 256ul << 20: /* 256 MB */
return 4;
case 1ul << 30: /* 1 GB */
return 2;
case 16ul << 30: /* 16 GB */
return 1;
case 256ul << 30: /* 256 GB */
return 0;
default:
return -1;
}
}
static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct kvmppc_rma_info *ri = vma->vm_file->private_data;
struct page *page;
if (vmf->pgoff >= ri->npages)
return VM_FAULT_SIGBUS;
page = pfn_to_page(ri->base_pfn + vmf->pgoff);
get_page(page);
vmf->page = page;
return 0;
}
static const struct vm_operations_struct kvm_rma_vm_ops = {
.fault = kvm_rma_fault,
};
static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
{
vma->vm_flags |= VM_RESERVED;
vma->vm_ops = &kvm_rma_vm_ops;
return 0;
}
static int kvm_rma_release(struct inode *inode, struct file *filp)
{
struct kvmppc_rma_info *ri = filp->private_data;
kvm_release_rma(ri);
return 0;
}
static struct file_operations kvm_rma_fops = {
.mmap = kvm_rma_mmap,
.release = kvm_rma_release,
};
long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
{
struct kvmppc_rma_info *ri;
long fd;
ri = kvm_alloc_rma();
if (!ri)
return -ENOMEM;
fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR);
if (fd < 0)
kvm_release_rma(ri);
ret->rma_size = ri->npages << PAGE_SHIFT;
return fd;
}
static struct page *hva_to_page(unsigned long addr)
{
struct page *page[1];
int npages;
might_sleep();
npages = get_user_pages_fast(addr, 1, 1, page);
if (unlikely(npages != 1))
return 0;
return page[0];
}
int kvmppc_core_prepare_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem)
{
unsigned long psize, porder;
unsigned long i, npages, totalpages;
unsigned long pg_ix;
struct kvmppc_pginfo *pginfo;
unsigned long hva;
struct kvmppc_rma_info *ri = NULL;
struct page *page;
/* For now, only allow 16MB pages */
porder = LARGE_PAGE_ORDER;
psize = 1ul << porder;
if ((mem->memory_size & (psize - 1)) ||
(mem->guest_phys_addr & (psize - 1))) {
pr_err("bad memory_size=%llx @ %llx\n",
mem->memory_size, mem->guest_phys_addr);
return -EINVAL;
}
npages = mem->memory_size >> porder;
totalpages = (mem->guest_phys_addr + mem->memory_size) >> porder;
/* More memory than we have space to track? */
if (totalpages > (1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER)))
return -EINVAL;
/* Do we already have an RMA registered? */
if (mem->guest_phys_addr == 0 && kvm->arch.rma)
return -EINVAL;
if (totalpages > kvm->arch.ram_npages)
kvm->arch.ram_npages = totalpages;
/* Is this one of our preallocated RMAs? */
if (mem->guest_phys_addr == 0) {
struct vm_area_struct *vma;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, mem->userspace_addr);
if (vma && vma->vm_file &&
vma->vm_file->f_op == &kvm_rma_fops &&
mem->userspace_addr == vma->vm_start)
ri = vma->vm_file->private_data;
up_read(&current->mm->mmap_sem);
if (!ri && cpu_has_feature(CPU_FTR_ARCH_201)) {
pr_err("CPU requires an RMO\n");
return -EINVAL;
}
}
if (ri) {
unsigned long rma_size;
unsigned long lpcr;
long rmls;
rma_size = ri->npages << PAGE_SHIFT;
if (rma_size > mem->memory_size)
rma_size = mem->memory_size;
rmls = lpcr_rmls(rma_size);
if (rmls < 0) {
pr_err("Can't use RMA of 0x%lx bytes\n", rma_size);
return -EINVAL;
}
atomic_inc(&ri->use_count);
kvm->arch.rma = ri;
kvm->arch.n_rma_pages = rma_size >> porder;
/* Update LPCR and RMOR */
lpcr = kvm->arch.lpcr;
if (cpu_has_feature(CPU_FTR_ARCH_201)) {
/* PPC970; insert RMLS value (split field) in HID4 */
lpcr &= ~((1ul << HID4_RMLS0_SH) |
(3ul << HID4_RMLS2_SH));
lpcr |= ((rmls >> 2) << HID4_RMLS0_SH) |
((rmls & 3) << HID4_RMLS2_SH);
/* RMOR is also in HID4 */
lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
<< HID4_RMOR_SH;
} else {
/* POWER7 */
lpcr &= ~(LPCR_VPM0 | LPCR_VRMA_L);
lpcr |= rmls << LPCR_RMLS_SH;
kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT;
}
kvm->arch.lpcr = lpcr;
pr_info("Using RMO at %lx size %lx (LPCR = %lx)\n",
ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
}
pg_ix = mem->guest_phys_addr >> porder;
pginfo = kvm->arch.ram_pginfo + pg_ix;
for (i = 0; i < npages; ++i, ++pg_ix) {
if (ri && pg_ix < kvm->arch.n_rma_pages) {
pginfo[i].pfn = ri->base_pfn +
(pg_ix << (porder - PAGE_SHIFT));
continue;
}
hva = mem->userspace_addr + (i << porder);
page = hva_to_page(hva);
if (!page) {
pr_err("oops, no pfn for hva %lx\n", hva);
goto err;
}
/* Check it's a 16MB page */
if (!PageHead(page) ||
compound_order(page) != (LARGE_PAGE_ORDER - PAGE_SHIFT)) {
pr_err("page at %lx isn't 16MB (o=%d)\n",
hva, compound_order(page));
goto err;
}
pginfo[i].pfn = page_to_pfn(page);
}
return 0;
err:
return -EINVAL;
}
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 &&
!kvm->arch.rma)
kvmppc_map_vrma(kvm, mem);
}
int kvmppc_core_init_vm(struct kvm *kvm)
{
long r;
unsigned long npages = 1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER);
long err = -ENOMEM;
unsigned long lpcr;
/* Allocate hashed page table */
r = kvmppc_alloc_hpt(kvm);
if (r)
return r;
INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
kvm->arch.ram_pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo),
GFP_KERNEL);
if (!kvm->arch.ram_pginfo) {
pr_err("kvmppc_core_init_vm: couldn't alloc %lu bytes\n",
npages * sizeof(struct kvmppc_pginfo));
goto out_free;
}
kvm->arch.ram_npages = 0;
kvm->arch.ram_psize = 1ul << LARGE_PAGE_ORDER;
kvm->arch.ram_porder = LARGE_PAGE_ORDER;
kvm->arch.rma = NULL;
kvm->arch.n_rma_pages = 0;
kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
if (cpu_has_feature(CPU_FTR_ARCH_201)) {
/* PPC970; HID4 is effectively the LPCR */
unsigned long lpid = kvm->arch.lpid;
kvm->arch.host_lpid = 0;
kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
((lpid & 0xf) << HID4_LPID5_SH);
} else {
/* POWER7; init LPCR for virtual RMA mode */
kvm->arch.host_lpid = mfspr(SPRN_LPID);
kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
lpcr &= LPCR_PECE | LPCR_LPES;
lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
LPCR_VPM0 | LPCR_VRMA_L;
}
kvm->arch.lpcr = lpcr;
return 0;
out_free:
kvmppc_free_hpt(kvm);
return err;
}
void kvmppc_core_destroy_vm(struct kvm *kvm)
{
struct kvmppc_pginfo *pginfo;
unsigned long i;
if (kvm->arch.ram_pginfo) {
pginfo = kvm->arch.ram_pginfo;
kvm->arch.ram_pginfo = NULL;
for (i = kvm->arch.n_rma_pages; i < kvm->arch.ram_npages; ++i)
if (pginfo[i].pfn)
put_page(pfn_to_page(pginfo[i].pfn));
kfree(pginfo);
}
if (kvm->arch.rma) {
kvm_release_rma(kvm->arch.rma);
kvm->arch.rma = NULL;
}
kvmppc_free_hpt(kvm);
WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
}
/* 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);
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