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linux/arch/powerpc/kvm/book3s_hv.c
Sam Bobroff 90fd09f804 KVM: PPC: Book3S HV: Improve H_CONFER implementation 
Currently the H_CONFER hcall is implemented in kernel virtual mode,
meaning that whenever a guest thread does an H_CONFER, all the threads
in that virtual core have to exit the guest.  This is bad for
performance because it interrupts the other threads even if they
are doing useful work.

The H_CONFER hcall is called by a guest VCPU when it is spinning on a
spinlock and it detects that the spinlock is held by a guest VCPU that
is currently not running on a physical CPU.  The idea is to give this
VCPU's time slice to the holder VCPU so that it can make progress
towards releasing the lock.

To avoid having the other threads exit the guest unnecessarily,
we add a real-mode implementation of H_CONFER that checks whether
the other threads are doing anything.  If all the other threads
are idle (i.e. in H_CEDE) or trying to confer (i.e. in H_CONFER),
it returns H_TOO_HARD which causes a guest exit and allows the
H_CONFER to be handled in virtual mode.

Otherwise it spins for a short time (up to 10 microseconds) to give
other threads the chance to observe that this thread is trying to
confer.  The spin loop also terminates when any thread exits the guest
or when all other threads are idle or trying to confer.  If the
timeout is reached, the H_CONFER returns H_SUCCESS.  In this case the
guest VCPU will recheck the spinlock word and most likely call
H_CONFER again.

This also improves the implementation of the H_CONFER virtual mode
handler.  If the VCPU is part of a virtual core (vcore) which is
runnable, there will be a 'runner' VCPU which has taken responsibility
for running the vcore.  In this case we yield to the runner VCPU
rather than the target VCPU.

We also introduce a check on the target VCPU's yield count: if it
differs from the yield count passed to H_CONFER, the target VCPU
has run since H_CONFER was called and may have already released
the lock.  This check is required by PAPR.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2014-12-17 13:53:39 +01:00

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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/export.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/cpumask.h>
#include <linux/spinlock.h>
#include <linux/page-flags.h>
#include <linux/srcu.h>
#include <linux/miscdevice.h>
#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/cache.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 <asm/hvcall.h>
#include <asm/switch_to.h>
#include <asm/smp.h>
#include <linux/gfp.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/hugetlb.h>
#include <linux/module.h>
#include "book3s.h"
#define CREATE_TRACE_POINTS
#include "trace_hv.h"
/* #define EXIT_DEBUG */
/* #define EXIT_DEBUG_SIMPLE */
/* #define EXIT_DEBUG_INT */
/* Used to indicate that a guest page fault needs to be handled */
#define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
/* Used as a "null" value for timebase values */
#define TB_NIL (~(u64)0)
static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
#if defined(CONFIG_PPC_64K_PAGES)
#define MPP_BUFFER_ORDER 0
#elif defined(CONFIG_PPC_4K_PAGES)
#define MPP_BUFFER_ORDER 3
#endif
static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
{
int me;
int cpu = vcpu->cpu;
wait_queue_head_t *wqp;
wqp = kvm_arch_vcpu_wq(vcpu);
if (waitqueue_active(wqp)) {
wake_up_interruptible(wqp);
++vcpu->stat.halt_wakeup;
}
me = get_cpu();
/* CPU points to the first thread of the core */
if (cpu != me && cpu >= 0 && cpu < nr_cpu_ids) {
#ifdef CONFIG_PPC_ICP_NATIVE
int real_cpu = cpu + vcpu->arch.ptid;
if (paca[real_cpu].kvm_hstate.xics_phys)
xics_wake_cpu(real_cpu);
else
#endif
if (cpu_online(cpu))
smp_send_reschedule(cpu);
}
put_cpu();
}
/*
* We use the vcpu_load/put functions to measure stolen time.
* Stolen time is counted as time when either the vcpu is able to
* run as part of a virtual core, but the task running the vcore
* is preempted or sleeping, or when the vcpu needs something done
* in the kernel by the task running the vcpu, but that task is
* preempted or sleeping. Those two things have to be counted
* separately, since one of the vcpu tasks will take on the job
* of running the core, and the other vcpu tasks in the vcore will
* sleep waiting for it to do that, but that sleep shouldn't count
* as stolen time.
*
* Hence we accumulate stolen time when the vcpu can run as part of
* a vcore using vc->stolen_tb, and the stolen time when the vcpu
* needs its task to do other things in the kernel (for example,
* service a page fault) in busy_stolen. We don't accumulate
* stolen time for a vcore when it is inactive, or for a vcpu
* when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
* a misnomer; it means that the vcpu task is not executing in
* the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
* the kernel. We don't have any way of dividing up that time
* between time that the vcpu is genuinely stopped, time that
* the task is actively working on behalf of the vcpu, and time
* that the task is preempted, so we don't count any of it as
* stolen.
*
* Updates to busy_stolen are protected by arch.tbacct_lock;
* updates to vc->stolen_tb are protected by the vcore->stoltb_lock
* lock. The stolen times are measured in units of timebase ticks.
* (Note that the != TB_NIL checks below are purely defensive;
* they should never fail.)
*/
static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
unsigned long flags;
/*
* We can test vc->runner without taking the vcore lock,
* because only this task ever sets vc->runner to this
* vcpu, and once it is set to this vcpu, only this task
* ever sets it to NULL.
*/
if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE) {
spin_lock_irqsave(&vc->stoltb_lock, flags);
if (vc->preempt_tb != TB_NIL) {
vc->stolen_tb += mftb() - vc->preempt_tb;
vc->preempt_tb = TB_NIL;
}
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
}
spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
vcpu->arch.busy_preempt != TB_NIL) {
vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
vcpu->arch.busy_preempt = TB_NIL;
}
spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
}
static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
unsigned long flags;
if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE) {
spin_lock_irqsave(&vc->stoltb_lock, flags);
vc->preempt_tb = mftb();
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
}
spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
vcpu->arch.busy_preempt = mftb();
spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
}
static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
{
vcpu->arch.shregs.msr = msr;
kvmppc_end_cede(vcpu);
}
void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
{
vcpu->arch.pvr = pvr;
}
int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
{
unsigned long pcr = 0;
struct kvmppc_vcore *vc = vcpu->arch.vcore;
if (arch_compat) {
switch (arch_compat) {
case PVR_ARCH_205:
/*
* If an arch bit is set in PCR, all the defined
* higher-order arch bits also have to be set.
*/
pcr = PCR_ARCH_206 | PCR_ARCH_205;
break;
case PVR_ARCH_206:
case PVR_ARCH_206p:
pcr = PCR_ARCH_206;
break;
case PVR_ARCH_207:
break;
default:
return -EINVAL;
}
if (!cpu_has_feature(CPU_FTR_ARCH_207S)) {
/* POWER7 can't emulate POWER8 */
if (!(pcr & PCR_ARCH_206))
return -EINVAL;
pcr &= ~PCR_ARCH_206;
}
}
spin_lock(&vc->lock);
vc->arch_compat = arch_compat;
vc->pcr = pcr;
spin_unlock(&vc->lock);
return 0;
}
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.vcore->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->__old_status |= LPPACA_OLD_SHARED_PROC;
vpa->yield_count = cpu_to_be32(1);
}
static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
unsigned long addr, unsigned long len)
{
/* check address is cacheline aligned */
if (addr & (L1_CACHE_BYTES - 1))
return -EINVAL;
spin_lock(&vcpu->arch.vpa_update_lock);
if (v->next_gpa != addr || v->len != len) {
v->next_gpa = addr;
v->len = addr ? len : 0;
v->update_pending = 1;
}
spin_unlock(&vcpu->arch.vpa_update_lock);
return 0;
}
/* Length for a per-processor buffer is passed in at offset 4 in the buffer */
struct reg_vpa {
u32 dummy;
union {
__be16 hword;
__be32 word;
} length;
};
static int vpa_is_registered(struct kvmppc_vpa *vpap)
{
if (vpap->update_pending)
return vpap->next_gpa != 0;
return vpap->pinned_addr != NULL;
}
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 len, nb;
void *va;
struct kvm_vcpu *tvcpu;
int err;
int subfunc;
struct kvmppc_vpa *vpap;
tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
if (!tvcpu)
return H_PARAMETER;
subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
subfunc == H_VPA_REG_SLB) {
/* Registering new area - address must be cache-line aligned */
if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
return H_PARAMETER;
/* convert logical addr to kernel addr and read length */
va = kvmppc_pin_guest_page(kvm, vpa, &nb);
if (va == NULL)
return H_PARAMETER;
if (subfunc == H_VPA_REG_VPA)
len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
else
len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
kvmppc_unpin_guest_page(kvm, va, vpa, false);
/* Check length */
if (len > nb || len < sizeof(struct reg_vpa))
return H_PARAMETER;
} else {
vpa = 0;
len = 0;
}
err = H_PARAMETER;
vpap = NULL;
spin_lock(&tvcpu->arch.vpa_update_lock);
switch (subfunc) {
case H_VPA_REG_VPA: /* register VPA */
if (len < sizeof(struct lppaca))
break;
vpap = &tvcpu->arch.vpa;
err = 0;
break;
case H_VPA_REG_DTL: /* register DTL */
if (len < sizeof(struct dtl_entry))
break;
len -= len % sizeof(struct dtl_entry);
/* Check that they have previously registered a VPA */
err = H_RESOURCE;
if (!vpa_is_registered(&tvcpu->arch.vpa))
break;
vpap = &tvcpu->arch.dtl;
err = 0;
break;
case H_VPA_REG_SLB: /* register SLB shadow buffer */
/* Check that they have previously registered a VPA */
err = H_RESOURCE;
if (!vpa_is_registered(&tvcpu->arch.vpa))
break;
vpap = &tvcpu->arch.slb_shadow;
err = 0;
break;
case H_VPA_DEREG_VPA: /* deregister VPA */
/* Check they don't still have a DTL or SLB buf registered */
err = H_RESOURCE;
if (vpa_is_registered(&tvcpu->arch.dtl) ||
vpa_is_registered(&tvcpu->arch.slb_shadow))
break;
vpap = &tvcpu->arch.vpa;
err = 0;
break;
case H_VPA_DEREG_DTL: /* deregister DTL */
vpap = &tvcpu->arch.dtl;
err = 0;
break;
case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
vpap = &tvcpu->arch.slb_shadow;
err = 0;
break;
}
if (vpap) {
vpap->next_gpa = vpa;
vpap->len = len;
vpap->update_pending = 1;
}
spin_unlock(&tvcpu->arch.vpa_update_lock);
return err;
}
static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
{
struct kvm *kvm = vcpu->kvm;
void *va;
unsigned long nb;
unsigned long gpa;
/*
* We need to pin the page pointed to by vpap->next_gpa,
* but we can't call kvmppc_pin_guest_page under the lock
* as it does get_user_pages() and down_read(). So we
* have to drop the lock, pin the page, then get the lock
* again and check that a new area didn't get registered
* in the meantime.
*/
for (;;) {
gpa = vpap->next_gpa;
spin_unlock(&vcpu->arch.vpa_update_lock);
va = NULL;
nb = 0;
if (gpa)
va = kvmppc_pin_guest_page(kvm, gpa, &nb);
spin_lock(&vcpu->arch.vpa_update_lock);
if (gpa == vpap->next_gpa)
break;
/* sigh... unpin that one and try again */
if (va)
kvmppc_unpin_guest_page(kvm, va, gpa, false);
}
vpap->update_pending = 0;
if (va && nb < vpap->len) {
/*
* If it's now too short, it must be that userspace
* has changed the mappings underlying guest memory,
* so unregister the region.
*/
kvmppc_unpin_guest_page(kvm, va, gpa, false);
va = NULL;
}
if (vpap->pinned_addr)
kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
vpap->dirty);
vpap->gpa = gpa;
vpap->pinned_addr = va;
vpap->dirty = false;
if (va)
vpap->pinned_end = va + vpap->len;
}
static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.vpa.update_pending ||
vcpu->arch.slb_shadow.update_pending ||
vcpu->arch.dtl.update_pending))
return;
spin_lock(&vcpu->arch.vpa_update_lock);
if (vcpu->arch.vpa.update_pending) {
kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
if (vcpu->arch.vpa.pinned_addr)
init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
}
if (vcpu->arch.dtl.update_pending) {
kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
vcpu->arch.dtl_index = 0;
}
if (vcpu->arch.slb_shadow.update_pending)
kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
/*
* Return the accumulated stolen time for the vcore up until `now'.
* The caller should hold the vcore lock.
*/
static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
{
u64 p;
unsigned long flags;
spin_lock_irqsave(&vc->stoltb_lock, flags);
p = vc->stolen_tb;
if (vc->vcore_state != VCORE_INACTIVE &&
vc->preempt_tb != TB_NIL)
p += now - vc->preempt_tb;
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
return p;
}
static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
struct kvmppc_vcore *vc)
{
struct dtl_entry *dt;
struct lppaca *vpa;
unsigned long stolen;
unsigned long core_stolen;
u64 now;
dt = vcpu->arch.dtl_ptr;
vpa = vcpu->arch.vpa.pinned_addr;
now = mftb();
core_stolen = vcore_stolen_time(vc, now);
stolen = core_stolen - vcpu->arch.stolen_logged;
vcpu->arch.stolen_logged = core_stolen;
spin_lock_irq(&vcpu->arch.tbacct_lock);
stolen += vcpu->arch.busy_stolen;
vcpu->arch.busy_stolen = 0;
spin_unlock_irq(&vcpu->arch.tbacct_lock);
if (!dt || !vpa)
return;
memset(dt, 0, sizeof(struct dtl_entry));
dt->dispatch_reason = 7;
dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
dt->timebase = cpu_to_be64(now + vc->tb_offset);
dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
++dt;
if (dt == vcpu->arch.dtl.pinned_end)
dt = vcpu->arch.dtl.pinned_addr;
vcpu->arch.dtl_ptr = dt;
/* order writing *dt vs. writing vpa->dtl_idx */
smp_wmb();
vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
vcpu->arch.dtl.dirty = true;
}
static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
return true;
if ((!vcpu->arch.vcore->arch_compat) &&
cpu_has_feature(CPU_FTR_ARCH_207S))
return true;
return false;
}
static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
unsigned long resource, unsigned long value1,
unsigned long value2)
{
switch (resource) {
case H_SET_MODE_RESOURCE_SET_CIABR:
if (!kvmppc_power8_compatible(vcpu))
return H_P2;
if (value2)
return H_P4;
if (mflags)
return H_UNSUPPORTED_FLAG_START;
/* Guests can't breakpoint the hypervisor */
if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
return H_P3;
vcpu->arch.ciabr = value1;
return H_SUCCESS;
case H_SET_MODE_RESOURCE_SET_DAWR:
if (!kvmppc_power8_compatible(vcpu))
return H_P2;
if (mflags)
return H_UNSUPPORTED_FLAG_START;
if (value2 & DABRX_HYP)
return H_P4;
vcpu->arch.dawr = value1;
vcpu->arch.dawrx = value2;
return H_SUCCESS;
default:
return H_TOO_HARD;
}
}
static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
{
struct kvmppc_vcore *vcore = target->arch.vcore;
/*
* We expect to have been called by the real mode handler
* (kvmppc_rm_h_confer()) which would have directly returned
* H_SUCCESS if the source vcore wasn't idle (e.g. if it may
* have useful work to do and should not confer) so we don't
* recheck that here.
*/
spin_lock(&vcore->lock);
if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
vcore->vcore_state != VCORE_INACTIVE)
target = vcore->runner;
spin_unlock(&vcore->lock);
return kvm_vcpu_yield_to(target);
}
static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
{
int yield_count = 0;
struct lppaca *lppaca;
spin_lock(&vcpu->arch.vpa_update_lock);
lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
if (lppaca)
yield_count = lppaca->yield_count;
spin_unlock(&vcpu->arch.vpa_update_lock);
return yield_count;
}
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
{
unsigned long req = kvmppc_get_gpr(vcpu, 3);
unsigned long target, ret = H_SUCCESS;
int yield_count;
struct kvm_vcpu *tvcpu;
int idx, rc;
if (req <= MAX_HCALL_OPCODE &&
!test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
return RESUME_HOST;
switch (req) {
case H_CEDE:
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:
target = kvmppc_get_gpr(vcpu, 4);
if (target == -1)
break;
tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
if (!tvcpu) {
ret = H_PARAMETER;
break;
}
yield_count = kvmppc_get_gpr(vcpu, 5);
if (kvmppc_get_yield_count(tvcpu) != yield_count)
break;
kvm_arch_vcpu_yield_to(tvcpu);
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;
case H_RTAS:
if (list_empty(&vcpu->kvm->arch.rtas_tokens))
return RESUME_HOST;
idx = srcu_read_lock(&vcpu->kvm->srcu);
rc = kvmppc_rtas_hcall(vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
if (rc == -ENOENT)
return RESUME_HOST;
else if (rc == 0)
break;
/* Send the error out to userspace via KVM_RUN */
return rc;
case H_SET_MODE:
ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_XIRR:
case H_CPPR:
case H_EOI:
case H_IPI:
case H_IPOLL:
case H_XIRR_X:
if (kvmppc_xics_enabled(vcpu)) {
ret = kvmppc_xics_hcall(vcpu, req);
break;
} /* fallthrough */
default:
return RESUME_HOST;
}
kvmppc_set_gpr(vcpu, 3, ret);
vcpu->arch.hcall_needed = 0;
return RESUME_GUEST;
}
static int kvmppc_hcall_impl_hv(unsigned long cmd)
{
switch (cmd) {
case H_CEDE:
case H_PROD:
case H_CONFER:
case H_REGISTER_VPA:
case H_SET_MODE:
#ifdef CONFIG_KVM_XICS
case H_XIRR:
case H_CPPR:
case H_EOI:
case H_IPI:
case H_IPOLL:
case H_XIRR_X:
#endif
return 1;
}
/* See if it's in the real-mode table */
return kvmppc_hcall_impl_hv_realmode(cmd);
}
static int kvmppc_emulate_debug_inst(struct kvm_run *run,
struct kvm_vcpu *vcpu)
{
u32 last_inst;
if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
EMULATE_DONE) {
/*
* Fetch failed, so return to guest and
* try executing it again.
*/
return RESUME_GUEST;
}
if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
run->exit_reason = KVM_EXIT_DEBUG;
run->debug.arch.address = kvmppc_get_pc(vcpu);
return RESUME_HOST;
} else {
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
return RESUME_GUEST;
}
}
static int kvmppc_handle_exit_hv(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:
case BOOK3S_INTERRUPT_H_DOORBELL:
vcpu->stat.ext_intr_exits++;
r = RESUME_GUEST;
break;
/* HMI is hypervisor interrupt and host has handled it. Resume guest.*/
case BOOK3S_INTERRUPT_HMI:
case BOOK3S_INTERRUPT_PERFMON:
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_MACHINE_CHECK:
/*
* Deliver a machine check interrupt to the guest.
* We have to do this, even if the host has handled the
* machine check, because machine checks use SRR0/1 and
* the interrupt might have trashed guest state in them.
*/
kvmppc_book3s_queue_irqprio(vcpu,
BOOK3S_INTERRUPT_MACHINE_CHECK);
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;
/* hypercall with MSR_PR has already been handled in rmode,
* and never reaches here.
*/
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 accesses a page which it thinks
* it has mapped but which is not actually present, either because
* it is for an emulated I/O device or because the corresonding
* host page has been paged out. Any other HDSI/HISI interrupts
* have been handled already.
*/
case BOOK3S_INTERRUPT_H_DATA_STORAGE:
r = RESUME_PAGE_FAULT;
break;
case BOOK3S_INTERRUPT_H_INST_STORAGE:
vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
vcpu->arch.fault_dsisr = 0;
r = RESUME_PAGE_FAULT;
break;
/*
* This occurs if the guest executes an illegal instruction.
* If the guest debug is disabled, generate a program interrupt
* to the guest. If guest debug is enabled, we need to check
* whether the instruction is a software breakpoint instruction.
* Accordingly return to Guest or Host.
*/
case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
swab32(vcpu->arch.emul_inst) :
vcpu->arch.emul_inst;
if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
r = kvmppc_emulate_debug_inst(run, vcpu);
} else {
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
r = RESUME_GUEST;
}
break;
/*
* This occurs if the guest (kernel or userspace), does something that
* is prohibited by HFSCR. We just generate a program interrupt to
* the guest.
*/
case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
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);
run->hw.hardware_exit_reason = vcpu->arch.trap;
r = RESUME_HOST;
break;
}
return r;
}
static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int i;
memset(sregs, 0, sizeof(struct kvm_sregs));
sregs->pvr = vcpu->arch.pvr;
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;
}
static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int i, j;
/* Only accept the same PVR as the host's, since we can't spoof it */
if (sregs->pvr != vcpu->arch.pvr)
return -EINVAL;
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;
}
static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
bool preserve_top32)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
u64 mask;
spin_lock(&vc->lock);
/*
* If ILE (interrupt little-endian) has changed, update the
* MSR_LE bit in the intr_msr for each vcpu in this vcore.
*/
if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
struct kvm *kvm = vcpu->kvm;
struct kvm_vcpu *vcpu;
int i;
mutex_lock(&kvm->lock);
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->arch.vcore != vc)
continue;
if (new_lpcr & LPCR_ILE)
vcpu->arch.intr_msr |= MSR_LE;
else
vcpu->arch.intr_msr &= ~MSR_LE;
}
mutex_unlock(&kvm->lock);
}
/*
* Userspace can only modify DPFD (default prefetch depth),
* ILE (interrupt little-endian) and TC (translation control).
* On POWER8 userspace can also modify AIL (alt. interrupt loc.)
*/
mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
if (cpu_has_feature(CPU_FTR_ARCH_207S))
mask |= LPCR_AIL;
/* Broken 32-bit version of LPCR must not clear top bits */
if (preserve_top32)
mask &= 0xFFFFFFFF;
vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
spin_unlock(&vc->lock);
}
static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
union kvmppc_one_reg *val)
{
int r = 0;
long int i;
switch (id) {
case KVM_REG_PPC_DEBUG_INST:
*val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
break;
case KVM_REG_PPC_HIOR:
*val = get_reg_val(id, 0);
break;
case KVM_REG_PPC_DABR:
*val = get_reg_val(id, vcpu->arch.dabr);
break;
case KVM_REG_PPC_DABRX:
*val = get_reg_val(id, vcpu->arch.dabrx);
break;
case KVM_REG_PPC_DSCR:
*val = get_reg_val(id, vcpu->arch.dscr);
break;
case KVM_REG_PPC_PURR:
*val = get_reg_val(id, vcpu->arch.purr);
break;
case KVM_REG_PPC_SPURR:
*val = get_reg_val(id, vcpu->arch.spurr);
break;
case KVM_REG_PPC_AMR:
*val = get_reg_val(id, vcpu->arch.amr);
break;
case KVM_REG_PPC_UAMOR:
*val = get_reg_val(id, vcpu->arch.uamor);
break;
case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
i = id - KVM_REG_PPC_MMCR0;
*val = get_reg_val(id, vcpu->arch.mmcr[i]);
break;
case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
i = id - KVM_REG_PPC_PMC1;
*val = get_reg_val(id, vcpu->arch.pmc[i]);
break;
case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
i = id - KVM_REG_PPC_SPMC1;
*val = get_reg_val(id, vcpu->arch.spmc[i]);
break;
case KVM_REG_PPC_SIAR:
*val = get_reg_val(id, vcpu->arch.siar);
break;
case KVM_REG_PPC_SDAR:
*val = get_reg_val(id, vcpu->arch.sdar);
break;
case KVM_REG_PPC_SIER:
*val = get_reg_val(id, vcpu->arch.sier);
break;
case KVM_REG_PPC_IAMR:
*val = get_reg_val(id, vcpu->arch.iamr);
break;
case KVM_REG_PPC_PSPB:
*val = get_reg_val(id, vcpu->arch.pspb);
break;
case KVM_REG_PPC_DPDES:
*val = get_reg_val(id, vcpu->arch.vcore->dpdes);
break;
case KVM_REG_PPC_DAWR:
*val = get_reg_val(id, vcpu->arch.dawr);
break;
case KVM_REG_PPC_DAWRX:
*val = get_reg_val(id, vcpu->arch.dawrx);
break;
case KVM_REG_PPC_CIABR:
*val = get_reg_val(id, vcpu->arch.ciabr);
break;
case KVM_REG_PPC_CSIGR:
*val = get_reg_val(id, vcpu->arch.csigr);
break;
case KVM_REG_PPC_TACR:
*val = get_reg_val(id, vcpu->arch.tacr);
break;
case KVM_REG_PPC_TCSCR:
*val = get_reg_val(id, vcpu->arch.tcscr);
break;
case KVM_REG_PPC_PID:
*val = get_reg_val(id, vcpu->arch.pid);
break;
case KVM_REG_PPC_ACOP:
*val = get_reg_val(id, vcpu->arch.acop);
break;
case KVM_REG_PPC_WORT:
*val = get_reg_val(id, vcpu->arch.wort);
break;
case KVM_REG_PPC_VPA_ADDR:
spin_lock(&vcpu->arch.vpa_update_lock);
*val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_VPA_SLB:
spin_lock(&vcpu->arch.vpa_update_lock);
val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
val->vpaval.length = vcpu->arch.slb_shadow.len;
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_VPA_DTL:
spin_lock(&vcpu->arch.vpa_update_lock);
val->vpaval.addr = vcpu->arch.dtl.next_gpa;
val->vpaval.length = vcpu->arch.dtl.len;
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_TB_OFFSET:
*val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
break;
case KVM_REG_PPC_LPCR:
case KVM_REG_PPC_LPCR_64:
*val = get_reg_val(id, vcpu->arch.vcore->lpcr);
break;
case KVM_REG_PPC_PPR:
*val = get_reg_val(id, vcpu->arch.ppr);
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case KVM_REG_PPC_TFHAR:
*val = get_reg_val(id, vcpu->arch.tfhar);
break;
case KVM_REG_PPC_TFIAR:
*val = get_reg_val(id, vcpu->arch.tfiar);
break;
case KVM_REG_PPC_TEXASR:
*val = get_reg_val(id, vcpu->arch.texasr);
break;
case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
i = id - KVM_REG_PPC_TM_GPR0;
*val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
break;
case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
{
int j;
i = id - KVM_REG_PPC_TM_VSR0;
if (i < 32)
for (j = 0; j < TS_FPRWIDTH; j++)
val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
else {
if (cpu_has_feature(CPU_FTR_ALTIVEC))
val->vval = vcpu->arch.vr_tm.vr[i-32];
else
r = -ENXIO;
}
break;
}
case KVM_REG_PPC_TM_CR:
*val = get_reg_val(id, vcpu->arch.cr_tm);
break;
case KVM_REG_PPC_TM_LR:
*val = get_reg_val(id, vcpu->arch.lr_tm);
break;
case KVM_REG_PPC_TM_CTR:
*val = get_reg_val(id, vcpu->arch.ctr_tm);
break;
case KVM_REG_PPC_TM_FPSCR:
*val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
break;
case KVM_REG_PPC_TM_AMR:
*val = get_reg_val(id, vcpu->arch.amr_tm);
break;
case KVM_REG_PPC_TM_PPR:
*val = get_reg_val(id, vcpu->arch.ppr_tm);
break;
case KVM_REG_PPC_TM_VRSAVE:
*val = get_reg_val(id, vcpu->arch.vrsave_tm);
break;
case KVM_REG_PPC_TM_VSCR:
if (cpu_has_feature(CPU_FTR_ALTIVEC))
*val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
else
r = -ENXIO;
break;
case KVM_REG_PPC_TM_DSCR:
*val = get_reg_val(id, vcpu->arch.dscr_tm);
break;
case KVM_REG_PPC_TM_TAR:
*val = get_reg_val(id, vcpu->arch.tar_tm);
break;
#endif
case KVM_REG_PPC_ARCH_COMPAT:
*val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
break;
default:
r = -EINVAL;
break;
}
return r;
}
static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
union kvmppc_one_reg *val)
{
int r = 0;
long int i;
unsigned long addr, len;
switch (id) {
case KVM_REG_PPC_HIOR:
/* Only allow this to be set to zero */
if (set_reg_val(id, *val))
r = -EINVAL;
break;
case KVM_REG_PPC_DABR:
vcpu->arch.dabr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DABRX:
vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
break;
case KVM_REG_PPC_DSCR:
vcpu->arch.dscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PURR:
vcpu->arch.purr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SPURR:
vcpu->arch.spurr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_AMR:
vcpu->arch.amr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_UAMOR:
vcpu->arch.uamor = set_reg_val(id, *val);
break;
case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
i = id - KVM_REG_PPC_MMCR0;
vcpu->arch.mmcr[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
i = id - KVM_REG_PPC_PMC1;
vcpu->arch.pmc[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
i = id - KVM_REG_PPC_SPMC1;
vcpu->arch.spmc[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIAR:
vcpu->arch.siar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SDAR:
vcpu->arch.sdar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIER:
vcpu->arch.sier = set_reg_val(id, *val);
break;
case KVM_REG_PPC_IAMR:
vcpu->arch.iamr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PSPB:
vcpu->arch.pspb = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DPDES:
vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DAWR:
vcpu->arch.dawr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DAWRX:
vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
break;
case KVM_REG_PPC_CIABR:
vcpu->arch.ciabr = set_reg_val(id, *val);
/* Don't allow setting breakpoints in hypervisor code */
if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */
break;
case KVM_REG_PPC_CSIGR:
vcpu->arch.csigr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TACR:
vcpu->arch.tacr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TCSCR:
vcpu->arch.tcscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PID:
vcpu->arch.pid = set_reg_val(id, *val);
break;
case KVM_REG_PPC_ACOP:
vcpu->arch.acop = set_reg_val(id, *val);
break;
case KVM_REG_PPC_WORT:
vcpu->arch.wort = set_reg_val(id, *val);
break;
case KVM_REG_PPC_VPA_ADDR:
addr = set_reg_val(id, *val);
r = -EINVAL;
if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
vcpu->arch.dtl.next_gpa))
break;
r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
break;
case KVM_REG_PPC_VPA_SLB:
addr = val->vpaval.addr;
len = val->vpaval.length;
r = -EINVAL;
if (addr && !vcpu->arch.vpa.next_gpa)
break;
r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
break;
case KVM_REG_PPC_VPA_DTL:
addr = val->vpaval.addr;
len = val->vpaval.length;
r = -EINVAL;
if (addr && (len < sizeof(struct dtl_entry) ||
!vcpu->arch.vpa.next_gpa))
break;
len -= len % sizeof(struct dtl_entry);
r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
break;
case KVM_REG_PPC_TB_OFFSET:
/* round up to multiple of 2^24 */
vcpu->arch.vcore->tb_offset =
ALIGN(set_reg_val(id, *val), 1UL << 24);
break;
case KVM_REG_PPC_LPCR:
kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
break;
case KVM_REG_PPC_LPCR_64:
kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
break;
case KVM_REG_PPC_PPR:
vcpu->arch.ppr = set_reg_val(id, *val);
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case KVM_REG_PPC_TFHAR:
vcpu->arch.tfhar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TFIAR:
vcpu->arch.tfiar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TEXASR:
vcpu->arch.texasr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
i = id - KVM_REG_PPC_TM_GPR0;
vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
{
int j;
i = id - KVM_REG_PPC_TM_VSR0;
if (i < 32)
for (j = 0; j < TS_FPRWIDTH; j++)
vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
else
if (cpu_has_feature(CPU_FTR_ALTIVEC))
vcpu->arch.vr_tm.vr[i-32] = val->vval;
else
r = -ENXIO;
break;
}
case KVM_REG_PPC_TM_CR:
vcpu->arch.cr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_LR:
vcpu->arch.lr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_CTR:
vcpu->arch.ctr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_FPSCR:
vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_AMR:
vcpu->arch.amr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_PPR:
vcpu->arch.ppr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VRSAVE:
vcpu->arch.vrsave_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VSCR:
if (cpu_has_feature(CPU_FTR_ALTIVEC))
vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
else
r = - ENXIO;
break;
case KVM_REG_PPC_TM_DSCR:
vcpu->arch.dscr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_TAR:
vcpu->arch.tar_tm = set_reg_val(id, *val);
break;
#endif
case KVM_REG_PPC_ARCH_COMPAT:
r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
break;
default:
r = -EINVAL;
break;
}
return r;
}
static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core)
{
struct kvmppc_vcore *vcore;
vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
if (vcore == NULL)
return NULL;
INIT_LIST_HEAD(&vcore->runnable_threads);
spin_lock_init(&vcore->lock);
spin_lock_init(&vcore->stoltb_lock);
init_waitqueue_head(&vcore->wq);
vcore->preempt_tb = TB_NIL;
vcore->lpcr = kvm->arch.lpcr;
vcore->first_vcpuid = core * threads_per_subcore;
vcore->kvm = kvm;
vcore->mpp_buffer_is_valid = false;
if (cpu_has_feature(CPU_FTR_ARCH_207S))
vcore->mpp_buffer = (void *)__get_free_pages(
GFP_KERNEL|__GFP_ZERO,
MPP_BUFFER_ORDER);
return vcore;
}
static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
unsigned int id)
{
struct kvm_vcpu *vcpu;
int err = -EINVAL;
int core;
struct kvmppc_vcore *vcore;
core = id / threads_per_subcore;
if (core >= KVM_MAX_VCORES)
goto out;
err = -ENOMEM;
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
if (!vcpu)
goto out;
err = kvm_vcpu_init(vcpu, kvm, id);
if (err)
goto free_vcpu;
vcpu->arch.shared = &vcpu->arch.shregs;
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
/*
* The shared struct is never shared on HV,
* so we can always use host endianness
*/
#ifdef __BIG_ENDIAN__
vcpu->arch.shared_big_endian = true;
#else
vcpu->arch.shared_big_endian = false;
#endif
#endif
vcpu->arch.mmcr[0] = MMCR0_FC;
vcpu->arch.ctrl = CTRL_RUNLATCH;
/* default to host PVR, since we can't spoof it */
kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
spin_lock_init(&vcpu->arch.vpa_update_lock);
spin_lock_init(&vcpu->arch.tbacct_lock);
vcpu->arch.busy_preempt = TB_NIL;
vcpu->arch.intr_msr = MSR_SF | MSR_ME;
kvmppc_mmu_book3s_hv_init(vcpu);
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
init_waitqueue_head(&vcpu->arch.cpu_run);
mutex_lock(&kvm->lock);
vcore = kvm->arch.vcores[core];
if (!vcore) {
vcore = kvmppc_vcore_create(kvm, core);
kvm->arch.vcores[core] = vcore;
kvm->arch.online_vcores++;
}
mutex_unlock(&kvm->lock);
if (!vcore)
goto free_vcpu;
spin_lock(&vcore->lock);
++vcore->num_threads;
spin_unlock(&vcore->lock);
vcpu->arch.vcore = vcore;
vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
vcpu->arch.cpu_type = KVM_CPU_3S_64;
kvmppc_sanity_check(vcpu);
return vcpu;
free_vcpu:
kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
return ERR_PTR(err);
}
static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
{
if (vpa->pinned_addr)
kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
vpa->dirty);
}
static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
{
spin_lock(&vcpu->arch.vpa_update_lock);
unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
spin_unlock(&vcpu->arch.vpa_update_lock);
kvm_vcpu_uninit(vcpu);
kmem_cache_free(kvm_vcpu_cache, vcpu);
}
static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
{
/* Indicate we want to get back into the guest */
return 1;
}
static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
{
unsigned long dec_nsec, now;
now = get_tb();
if (now > vcpu->arch.dec_expires) {
/* decrementer has already gone negative */
kvmppc_core_queue_dec(vcpu);
kvmppc_core_prepare_to_enter(vcpu);
return;
}
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);
vcpu->arch.timer_running = 1;
}
static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
{
vcpu->arch.ceded = 0;
if (vcpu->arch.timer_running) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
vcpu->arch.timer_running = 0;
}
}
extern void __kvmppc_vcore_entry(void);
static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
struct kvm_vcpu *vcpu)
{
u64 now;
if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
return;
spin_lock_irq(&vcpu->arch.tbacct_lock);
now = mftb();
vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
vcpu->arch.stolen_logged;
vcpu->arch.busy_preempt = now;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
spin_unlock_irq(&vcpu->arch.tbacct_lock);
--vc->n_runnable;
list_del(&vcpu->arch.run_list);
}
static int kvmppc_grab_hwthread(int cpu)
{
struct paca_struct *tpaca;
long timeout = 10000;
tpaca = &paca[cpu];
/* Ensure the thread won't go into the kernel if it wakes */
tpaca->kvm_hstate.hwthread_req = 1;
tpaca->kvm_hstate.kvm_vcpu = NULL;
/*
* If the thread is already executing in the kernel (e.g. handling
* a stray interrupt), wait for it to get back to nap mode.
* The smp_mb() is to ensure that our setting of hwthread_req
* is visible before we look at hwthread_state, so if this
* races with the code at system_reset_pSeries and the thread
* misses our setting of hwthread_req, we are sure to see its
* setting of hwthread_state, and vice versa.
*/
smp_mb();
while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
if (--timeout <= 0) {
pr_err("KVM: couldn't grab cpu %d\n", cpu);
return -EBUSY;
}
udelay(1);
}
return 0;
}
static void kvmppc_release_hwthread(int cpu)
{
struct paca_struct *tpaca;
tpaca = &paca[cpu];
tpaca->kvm_hstate.hwthread_req = 0;
tpaca->kvm_hstate.kvm_vcpu = NULL;
}
static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
{
int cpu;
struct paca_struct *tpaca;
struct kvmppc_vcore *vc = vcpu->arch.vcore;
if (vcpu->arch.timer_running) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
vcpu->arch.timer_running = 0;
}
cpu = vc->pcpu + vcpu->arch.ptid;
tpaca = &paca[cpu];
tpaca->kvm_hstate.kvm_vcpu = vcpu;
tpaca->kvm_hstate.kvm_vcore = vc;
tpaca->kvm_hstate.ptid = vcpu->arch.ptid;
vcpu->cpu = vc->pcpu;
smp_wmb();
#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
if (cpu != smp_processor_id()) {
xics_wake_cpu(cpu);
if (vcpu->arch.ptid)
++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. Then grab the threads so they can't
* enter the kernel.
*/
static int on_primary_thread(void)
{
int cpu = smp_processor_id();
int thr;
/* Are we on a primary subcore? */
if (cpu_thread_in_subcore(cpu))
return 0;
thr = 0;
while (++thr < threads_per_subcore)
if (cpu_online(cpu + thr))
return 0;
/* Grab all hw threads so they can't go into the kernel */
for (thr = 1; thr < threads_per_subcore; ++thr) {
if (kvmppc_grab_hwthread(cpu + thr)) {
/* Couldn't grab one; let the others go */
do {
kvmppc_release_hwthread(cpu + thr);
} while (--thr > 0);
return 0;
}
}
return 1;
}
static void kvmppc_start_saving_l2_cache(struct kvmppc_vcore *vc)
{
phys_addr_t phy_addr, mpp_addr;
phy_addr = (phys_addr_t)virt_to_phys(vc->mpp_buffer);
mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK;
mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_ABORT);
logmpp(mpp_addr | PPC_LOGMPP_LOG_L2);
vc->mpp_buffer_is_valid = true;
}
static void kvmppc_start_restoring_l2_cache(const struct kvmppc_vcore *vc)
{
phys_addr_t phy_addr, mpp_addr;
phy_addr = virt_to_phys(vc->mpp_buffer);
mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK;
/* We must abort any in-progress save operations to ensure
* the table is valid so that prefetch engine knows when to
* stop prefetching. */
logmpp(mpp_addr | PPC_LOGMPP_LOG_ABORT);
mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_WHOLE_TABLE);
}
/*
* Run a set of guest threads on a physical core.
* Called with vc->lock held.
*/
static void kvmppc_run_core(struct kvmppc_vcore *vc)
{
struct kvm_vcpu *vcpu, *vnext;
long ret;
u64 now;
int i, need_vpa_update;
int srcu_idx;
struct kvm_vcpu *vcpus_to_update[threads_per_core];
/* don't start if any threads have a signal pending */
need_vpa_update = 0;
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
if (signal_pending(vcpu->arch.run_task))
return;
if (vcpu->arch.vpa.update_pending ||
vcpu->arch.slb_shadow.update_pending ||
vcpu->arch.dtl.update_pending)
vcpus_to_update[need_vpa_update++] = vcpu;
}
/*
* Initialize *vc, in particular vc->vcore_state, so we can
* drop the vcore lock if necessary.
*/
vc->n_woken = 0;
vc->nap_count = 0;
vc->entry_exit_count = 0;
vc->preempt_tb = TB_NIL;
vc->vcore_state = VCORE_STARTING;
vc->in_guest = 0;
vc->napping_threads = 0;
vc->conferring_threads = 0;
/*
* Updating any of the vpas requires calling kvmppc_pin_guest_page,
* which can't be called with any spinlocks held.
*/
if (need_vpa_update) {
spin_unlock(&vc->lock);
for (i = 0; i < need_vpa_update; ++i)
kvmppc_update_vpas(vcpus_to_update[i]);
spin_lock(&vc->lock);
}
/*
* Make sure we are running on primary threads, and that secondary
* threads are offline. Also check if the number of threads in this
* guest are greater than the current system threads per guest.
*/
if ((threads_per_core > 1) &&
((vc->num_threads > threads_per_subcore) || !on_primary_thread())) {
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
vcpu->arch.ret = -EBUSY;
goto out;
}
vc->pcpu = smp_processor_id();
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
kvmppc_start_thread(vcpu);
kvmppc_create_dtl_entry(vcpu, vc);
trace_kvm_guest_enter(vcpu);
}
/* Set this explicitly in case thread 0 doesn't have a vcpu */
get_paca()->kvm_hstate.kvm_vcore = vc;
get_paca()->kvm_hstate.ptid = 0;
vc->vcore_state = VCORE_RUNNING;
preempt_disable();
trace_kvmppc_run_core(vc, 0);
spin_unlock(&vc->lock);
kvm_guest_enter();
srcu_idx = srcu_read_lock(&vc->kvm->srcu);
if (vc->mpp_buffer_is_valid)
kvmppc_start_restoring_l2_cache(vc);
__kvmppc_vcore_entry();
spin_lock(&vc->lock);
if (vc->mpp_buffer)
kvmppc_start_saving_l2_cache(vc);
/* disable sending of IPIs on virtual external irqs */
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
vcpu->cpu = -1;
/* wait for secondary threads to finish writing their state to memory */
if (vc->nap_count < vc->n_woken)
kvmppc_wait_for_nap(vc);
for (i = 0; i < threads_per_subcore; ++i)
kvmppc_release_hwthread(vc->pcpu + i);
/* prevent other vcpu threads from doing kvmppc_start_thread() now */
vc->vcore_state = VCORE_EXITING;
spin_unlock(&vc->lock);
srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
/* make sure updates to secondary vcpu structs are visible now */
smp_mb();
kvm_guest_exit();
preempt_enable();
cond_resched();
spin_lock(&vc->lock);
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);
trace_kvm_guest_exit(vcpu);
ret = RESUME_GUEST;
if (vcpu->arch.trap)
ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
vcpu->arch.run_task);
vcpu->arch.ret = ret;
vcpu->arch.trap = 0;
if (vcpu->arch.ceded) {
if (!is_kvmppc_resume_guest(ret))
kvmppc_end_cede(vcpu);
else
kvmppc_set_timer(vcpu);
}
}
out:
vc->vcore_state = VCORE_INACTIVE;
list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
arch.run_list) {
if (!is_kvmppc_resume_guest(vcpu->arch.ret)) {
kvmppc_remove_runnable(vc, vcpu);
wake_up(&vcpu->arch.cpu_run);
}
}
trace_kvmppc_run_core(vc, 1);
}
/*
* Wait for some other vcpu thread to execute us, and
* wake us up when we need to handle something in the host.
*/
static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
{
DEFINE_WAIT(wait);
prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
schedule();
finish_wait(&vcpu->arch.cpu_run, &wait);
}
/*
* All the vcpus in this vcore are idle, so wait for a decrementer
* or external interrupt to one of the vcpus. vc->lock is held.
*/
static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
{
struct kvm_vcpu *vcpu;
int do_sleep = 1;
DEFINE_WAIT(wait);
prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
/*
* Check one last time for pending exceptions and ceded state after
* we put ourselves on the wait queue
*/
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded) {
do_sleep = 0;
break;
}
}
if (!do_sleep) {
finish_wait(&vc->wq, &wait);
return;
}
vc->vcore_state = VCORE_SLEEPING;
trace_kvmppc_vcore_blocked(vc, 0);
spin_unlock(&vc->lock);
schedule();
finish_wait(&vc->wq, &wait);
spin_lock(&vc->lock);
vc->vcore_state = VCORE_INACTIVE;
trace_kvmppc_vcore_blocked(vc, 1);
}
static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
int n_ceded;
struct kvmppc_vcore *vc;
struct kvm_vcpu *v, *vn;
trace_kvmppc_run_vcpu_enter(vcpu);
kvm_run->exit_reason = 0;
vcpu->arch.ret = RESUME_GUEST;
vcpu->arch.trap = 0;
kvmppc_update_vpas(vcpu);
/*
* Synchronize with other threads in this virtual core
*/
vc = vcpu->arch.vcore;
spin_lock(&vc->lock);
vcpu->arch.ceded = 0;
vcpu->arch.run_task = current;
vcpu->arch.kvm_run = kvm_run;
vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
vcpu->arch.busy_preempt = TB_NIL;
list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
++vc->n_runnable;
/*
* This happens the first time this is called for a vcpu.
* If the vcore is already running, we may be able to start
* this thread straight away and have it join in.
*/
if (!signal_pending(current)) {
if (vc->vcore_state == VCORE_RUNNING &&
VCORE_EXIT_COUNT(vc) == 0) {
kvmppc_create_dtl_entry(vcpu, vc);
kvmppc_start_thread(vcpu);
trace_kvm_guest_enter(vcpu);
} else if (vc->vcore_state == VCORE_SLEEPING) {
wake_up(&vc->wq);
}
}
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
!signal_pending(current)) {
if (vc->vcore_state != VCORE_INACTIVE) {
spin_unlock(&vc->lock);
kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
spin_lock(&vc->lock);
continue;
}
list_for_each_entry_safe(v, vn, &vc->runnable_threads,
arch.run_list) {
kvmppc_core_prepare_to_enter(v);
if (signal_pending(v->arch.run_task)) {
kvmppc_remove_runnable(vc, v);
v->stat.signal_exits++;
v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
v->arch.ret = -EINTR;
wake_up(&v->arch.cpu_run);
}
}
if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
break;
vc->runner = vcpu;
n_ceded = 0;
list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
if (!v->arch.pending_exceptions)
n_ceded += v->arch.ceded;
else
v->arch.ceded = 0;
}
if (n_ceded == vc->n_runnable)
kvmppc_vcore_blocked(vc);
else
kvmppc_run_core(vc);
vc->runner = NULL;
}
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
(vc->vcore_state == VCORE_RUNNING ||
vc->vcore_state == VCORE_EXITING)) {
spin_unlock(&vc->lock);
kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
spin_lock(&vc->lock);
}
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
kvmppc_remove_runnable(vc, vcpu);
vcpu->stat.signal_exits++;
kvm_run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
}
if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
/* Wake up some vcpu to run the core */
v = list_first_entry(&vc->runnable_threads,
struct kvm_vcpu, arch.run_list);
wake_up(&v->arch.cpu_run);
}
trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
spin_unlock(&vc->lock);
return vcpu->arch.ret;
}
static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
int r;
int srcu_idx;
if (!vcpu->arch.sane) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return -EINVAL;
}
kvmppc_core_prepare_to_enter(vcpu);
/* No need to go into the guest when all we'll do is come back out */
if (signal_pending(current)) {
run->exit_reason = KVM_EXIT_INTR;
return -EINTR;
}
atomic_inc(&vcpu->kvm->arch.vcpus_running);
/* Order vcpus_running vs. rma_setup_done, see kvmppc_alloc_reset_hpt */
smp_mb();
/* On the first time here, set up HTAB and VRMA */
if (!vcpu->kvm->arch.rma_setup_done) {
r = kvmppc_hv_setup_htab_rma(vcpu);
if (r)
goto out;
}
flush_fp_to_thread(current);
flush_altivec_to_thread(current);
flush_vsx_to_thread(current);
vcpu->arch.wqp = &vcpu->arch.vcore->wq;
vcpu->arch.pgdir = current->mm->pgd;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
do {
r = kvmppc_run_vcpu(run, vcpu);
if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
!(vcpu->arch.shregs.msr & MSR_PR)) {
trace_kvm_hcall_enter(vcpu);
r = kvmppc_pseries_do_hcall(vcpu);
trace_kvm_hcall_exit(vcpu, r);
kvmppc_core_prepare_to_enter(vcpu);
} else if (r == RESUME_PAGE_FAULT) {
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
r = kvmppc_book3s_hv_page_fault(run, vcpu,
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
}
} while (is_kvmppc_resume_guest(r));
out:
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
atomic_dec(&vcpu->kvm->arch.vcpus_running);
return r;
}
static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
int linux_psize)
{
struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
if (!def->shift)
return;
(*sps)->page_shift = def->shift;
(*sps)->slb_enc = def->sllp;
(*sps)->enc[0].page_shift = def->shift;
(*sps)->enc[0].pte_enc = def->penc[linux_psize];
/*
* Add 16MB MPSS support if host supports it
*/
if (linux_psize != MMU_PAGE_16M && def->penc[MMU_PAGE_16M] != -1) {
(*sps)->enc[1].page_shift = 24;
(*sps)->enc[1].pte_enc = def->penc[MMU_PAGE_16M];
}
(*sps)++;
}
static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
struct kvm_ppc_smmu_info *info)
{
struct kvm_ppc_one_seg_page_size *sps;
info->flags = KVM_PPC_PAGE_SIZES_REAL;
if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
info->flags |= KVM_PPC_1T_SEGMENTS;
info->slb_size = mmu_slb_size;
/* We only support these sizes for now, and no muti-size segments */
sps = &info->sps[0];
kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
return 0;
}
/*
* Get (and clear) the dirty memory log for a memory slot.
*/
static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
struct kvm_dirty_log *log)
{
struct kvm_memory_slot *memslot;
int r;
unsigned long n;
mutex_lock(&kvm->slots_lock);
r = -EINVAL;
if (log->slot >= KVM_USER_MEM_SLOTS)
goto out;
memslot = id_to_memslot(kvm->memslots, log->slot);
r = -ENOENT;
if (!memslot->dirty_bitmap)
goto out;
n = kvm_dirty_bitmap_bytes(memslot);
memset(memslot->dirty_bitmap, 0, n);
r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
goto out;
r = 0;
out:
mutex_unlock(&kvm->slots_lock);
return r;
}
static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
if (!dont || free->arch.rmap != dont->arch.rmap) {
vfree(free->arch.rmap);
free->arch.rmap = NULL;
}
}
static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
unsigned long npages)
{
slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
if (!slot->arch.rmap)
return -ENOMEM;
return 0;
}
static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
struct kvm_memory_slot *memslot,
struct kvm_userspace_memory_region *mem)
{
return 0;
}
static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
const struct kvm_memory_slot *old)
{
unsigned long npages = mem->memory_size >> PAGE_SHIFT;
struct kvm_memory_slot *memslot;
if (npages && old->npages) {
/*
* If modifying a memslot, reset all the rmap dirty bits.
* If this is a new memslot, we don't need to do anything
* since the rmap array starts out as all zeroes,
* i.e. no pages are dirty.
*/
memslot = id_to_memslot(kvm->memslots, mem->slot);
kvmppc_hv_get_dirty_log(kvm, memslot, NULL);
}
}
/*
* Update LPCR values in kvm->arch and in vcores.
* Caller must hold kvm->lock.
*/
void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
{
long int i;
u32 cores_done = 0;
if ((kvm->arch.lpcr & mask) == lpcr)
return;
kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
for (i = 0; i < KVM_MAX_VCORES; ++i) {
struct kvmppc_vcore *vc = kvm->arch.vcores[i];
if (!vc)
continue;
spin_lock(&vc->lock);
vc->lpcr = (vc->lpcr & ~mask) | lpcr;
spin_unlock(&vc->lock);
if (++cores_done >= kvm->arch.online_vcores)
break;
}
}
static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
{
return;
}
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
{
int err = 0;
struct kvm *kvm = vcpu->kvm;
unsigned long hva;
struct kvm_memory_slot *memslot;
struct vm_area_struct *vma;
unsigned long lpcr = 0, senc;
unsigned long psize, porder;
int srcu_idx;
mutex_lock(&kvm->lock);
if (kvm->arch.rma_setup_done)
goto out; /* another vcpu beat us to it */
/* Allocate hashed page table (if not done already) and reset it */
if (!kvm->arch.hpt_virt) {
err = kvmppc_alloc_hpt(kvm, NULL);
if (err) {
pr_err("KVM: Couldn't alloc HPT\n");
goto out;
}
}
/* Look up the memslot for guest physical address 0 */
srcu_idx = srcu_read_lock(&kvm->srcu);
memslot = gfn_to_memslot(kvm, 0);
/* We must have some memory at 0 by now */
err = -EINVAL;
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
goto out_srcu;
/* Look up the VMA for the start of this memory slot */
hva = memslot->userspace_addr;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, hva);
if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
goto up_out;
psize = vma_kernel_pagesize(vma);
porder = __ilog2(psize);
up_read(&current->mm->mmap_sem);
/* We can handle 4k, 64k or 16M pages in the VRMA */
err = -EINVAL;
if (!(psize == 0x1000 || psize == 0x10000 ||
psize == 0x1000000))
goto out_srcu;
/* Update VRMASD field in the LPCR */
senc = slb_pgsize_encoding(psize);
kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
(VRMA_VSID << SLB_VSID_SHIFT_1T);
/* the -4 is to account for senc values starting at 0x10 */
lpcr = senc << (LPCR_VRMASD_SH - 4);
/* Create HPTEs in the hash page table for the VRMA */
kvmppc_map_vrma(vcpu, memslot, porder);
kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
/* Order updates to kvm->arch.lpcr etc. vs. rma_setup_done */
smp_wmb();
kvm->arch.rma_setup_done = 1;
err = 0;
out_srcu:
srcu_read_unlock(&kvm->srcu, srcu_idx);
out:
mutex_unlock(&kvm->lock);
return err;
up_out:
up_read(&current->mm->mmap_sem);
goto out_srcu;
}
static int kvmppc_core_init_vm_hv(struct kvm *kvm)
{
unsigned long lpcr, lpid;
/* Allocate the guest's logical partition ID */
lpid = kvmppc_alloc_lpid();
if ((long)lpid < 0)
return -ENOMEM;
kvm->arch.lpid = lpid;
/*
* Since we don't flush the TLB when tearing down a VM,
* and this lpid might have previously been used,
* make sure we flush on each core before running the new VM.
*/
cpumask_setall(&kvm->arch.need_tlb_flush);
/* Start out with the default set of hcalls enabled */
memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
sizeof(kvm->arch.enabled_hcalls));
kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
/* 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_VPM1;
kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
(VRMA_VSID << SLB_VSID_SHIFT_1T);
/* On POWER8 turn on online bit to enable PURR/SPURR */
if (cpu_has_feature(CPU_FTR_ARCH_207S))
lpcr |= LPCR_ONL;
kvm->arch.lpcr = lpcr;
/*
* Track that we now have a HV mode VM active. This blocks secondary
* CPU threads from coming online.
*/
kvm_hv_vm_activated();
return 0;
}
static void kvmppc_free_vcores(struct kvm *kvm)
{
long int i;
for (i = 0; i < KVM_MAX_VCORES; ++i) {
if (kvm->arch.vcores[i] && kvm->arch.vcores[i]->mpp_buffer) {
struct kvmppc_vcore *vc = kvm->arch.vcores[i];
free_pages((unsigned long)vc->mpp_buffer,
MPP_BUFFER_ORDER);
}
kfree(kvm->arch.vcores[i]);
}
kvm->arch.online_vcores = 0;
}
static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
{
kvm_hv_vm_deactivated();
kvmppc_free_vcores(kvm);
kvmppc_free_hpt(kvm);
}
/* We don't need to emulate any privileged instructions or dcbz */
static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
return EMULATE_FAIL;
}
static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
ulong spr_val)
{
return EMULATE_FAIL;
}
static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
ulong *spr_val)
{
return EMULATE_FAIL;
}
static int kvmppc_core_check_processor_compat_hv(void)
{
if (!cpu_has_feature(CPU_FTR_HVMODE) ||
!cpu_has_feature(CPU_FTR_ARCH_206))
return -EIO;
return 0;
}
static long kvm_arch_vm_ioctl_hv(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm __maybe_unused = filp->private_data;
void __user *argp = (void __user *)arg;
long r;
switch (ioctl) {
case KVM_PPC_ALLOCATE_HTAB: {
u32 htab_order;
r = -EFAULT;
if (get_user(htab_order, (u32 __user *)argp))
break;
r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
if (r)
break;
r = -EFAULT;
if (put_user(htab_order, (u32 __user *)argp))
break;
r = 0;
break;
}
case KVM_PPC_GET_HTAB_FD: {
struct kvm_get_htab_fd ghf;
r = -EFAULT;
if (copy_from_user(&ghf, argp, sizeof(ghf)))
break;
r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
break;
}
default:
r = -ENOTTY;
}
return r;
}
/*
* List of hcall numbers to enable by default.
* For compatibility with old userspace, we enable by default
* all hcalls that were implemented before the hcall-enabling
* facility was added. Note this list should not include H_RTAS.
*/
static unsigned int default_hcall_list[] = {
H_REMOVE,
H_ENTER,
H_READ,
H_PROTECT,
H_BULK_REMOVE,
H_GET_TCE,
H_PUT_TCE,
H_SET_DABR,
H_SET_XDABR,
H_CEDE,
H_PROD,
H_CONFER,
H_REGISTER_VPA,
#ifdef CONFIG_KVM_XICS
H_EOI,
H_CPPR,
H_IPI,
H_IPOLL,
H_XIRR,
H_XIRR_X,
#endif
0
};
static void init_default_hcalls(void)
{
int i;
unsigned int hcall;
for (i = 0; default_hcall_list[i]; ++i) {
hcall = default_hcall_list[i];
WARN_ON(!kvmppc_hcall_impl_hv(hcall));
__set_bit(hcall / 4, default_enabled_hcalls);
}
}
static struct kvmppc_ops kvm_ops_hv = {
.get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
.set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
.get_one_reg = kvmppc_get_one_reg_hv,
.set_one_reg = kvmppc_set_one_reg_hv,
.vcpu_load = kvmppc_core_vcpu_load_hv,
.vcpu_put = kvmppc_core_vcpu_put_hv,
.set_msr = kvmppc_set_msr_hv,
.vcpu_run = kvmppc_vcpu_run_hv,
.vcpu_create = kvmppc_core_vcpu_create_hv,
.vcpu_free = kvmppc_core_vcpu_free_hv,
.check_requests = kvmppc_core_check_requests_hv,
.get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
.flush_memslot = kvmppc_core_flush_memslot_hv,
.prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
.commit_memory_region = kvmppc_core_commit_memory_region_hv,
.unmap_hva = kvm_unmap_hva_hv,
.unmap_hva_range = kvm_unmap_hva_range_hv,
.age_hva = kvm_age_hva_hv,
.test_age_hva = kvm_test_age_hva_hv,
.set_spte_hva = kvm_set_spte_hva_hv,
.mmu_destroy = kvmppc_mmu_destroy_hv,
.free_memslot = kvmppc_core_free_memslot_hv,
.create_memslot = kvmppc_core_create_memslot_hv,
.init_vm = kvmppc_core_init_vm_hv,
.destroy_vm = kvmppc_core_destroy_vm_hv,
.get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
.emulate_op = kvmppc_core_emulate_op_hv,
.emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
.emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
.fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
.arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
.hcall_implemented = kvmppc_hcall_impl_hv,
};
static int kvmppc_book3s_init_hv(void)
{
int r;
/*
* FIXME!! Do we need to check on all cpus ?
*/
r = kvmppc_core_check_processor_compat_hv();
if (r < 0)
return -ENODEV;
kvm_ops_hv.owner = THIS_MODULE;
kvmppc_hv_ops = &kvm_ops_hv;
init_default_hcalls();
r = kvmppc_mmu_hv_init();
return r;
}
static void kvmppc_book3s_exit_hv(void)
{
kvmppc_hv_ops = NULL;
}
module_init(kvmppc_book3s_init_hv);
module_exit(kvmppc_book3s_exit_hv);
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");
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