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Fixes for PPC and s390.

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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
 "Fixes for PPC and s390"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: PPC: Book3S HV: Restore SPRG3 in kvmhv_p9_guest_entry()
  KVM: PPC: Book3S HV: Fix lockdep warning when entering guest on POWER9
  KVM: PPC: Book3S HV: XIVE: Fix page offset when clearing ESB pages
  KVM: PPC: Book3S HV: XIVE: Take the srcu read lock when accessing memslots
  KVM: PPC: Book3S HV: XIVE: Do not clear IRQ data of passthrough interrupts
  KVM: PPC: Book3S HV: XIVE: Introduce a new mutex for the XIVE device
  KVM: PPC: Book3S HV: XIVE: Fix the enforced limit on the vCPU identifier
  KVM: PPC: Book3S HV: XIVE: Do not test the EQ flag validity when resetting
  KVM: PPC: Book3S HV: XIVE: Clear file mapping when device is released
  KVM: PPC: Book3S HV: Don't take kvm->lock around kvm_for_each_vcpu
  KVM: PPC: Book3S: Use new mutex to synchronize access to rtas token list
  KVM: PPC: Book3S HV: Use new mutex to synchronize MMU setup
  KVM: PPC: Book3S HV: Avoid touching arch.mmu_ready in XIVE release functions
  KVM: s390: Do not report unusabled IDs via KVM_CAP_MAX_VCPU_ID
  kvm: fix compile on s390 part 2
This commit is contained in:
Linus Torvalds 2019-06-02 10:19:39 -07:00
commit b44a1dd3f6
14 changed files with 157 additions and 117 deletions
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3
arch/mips/kvm/mips.c
View File

@ -1122,6 +1122,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_MAX_VCPU_ID:
r = KVM_MAX_VCPU_ID;
break;
case KVM_CAP_MIPS_FPU:
/* We don't handle systems with inconsistent cpu_has_fpu */
r = !!raw_cpu_has_fpu;

2
arch/powerpc/include/asm/kvm_host.h
View File

@ -309,6 +309,7 @@ struct kvm_arch {
#ifdef CONFIG_PPC_BOOK3S_64
struct list_head spapr_tce_tables;
struct list_head rtas_tokens;
struct mutex rtas_token_lock;
DECLARE_BITMAP(enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
#endif
#ifdef CONFIG_KVM_MPIC
@ -325,6 +326,7 @@ struct kvm_arch {
#endif
struct kvmppc_ops *kvm_ops;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
struct mutex mmu_setup_lock; /* nests inside vcpu mutexes */
u64 l1_ptcr;
int max_nested_lpid;
struct kvm_nested_guest *nested_guests[KVM_MAX_NESTED_GUESTS];

1
arch/powerpc/kvm/book3s.c
View File

@ -902,6 +902,7 @@ int kvmppc_core_init_vm(struct kvm *kvm)
#ifdef CONFIG_PPC64
INIT_LIST_HEAD_RCU(&kvm->arch.spapr_tce_tables);
INIT_LIST_HEAD(&kvm->arch.rtas_tokens);
mutex_init(&kvm->arch.rtas_token_lock);
#endif
return kvm->arch.kvm_ops->init_vm(kvm);

36
arch/powerpc/kvm/book3s_64_mmu_hv.c
View File

@ -63,7 +63,7 @@ struct kvm_resize_hpt {
struct work_struct work;
u32 order;
/* These fields protected by kvm->lock */
/* These fields protected by kvm->arch.mmu_setup_lock */
/* Possible values and their usage:
* <0 an error occurred during allocation,
@ -73,7 +73,7 @@ struct kvm_resize_hpt {
int error;
/* Private to the work thread, until error != -EBUSY,
* then protected by kvm->lock.
* then protected by kvm->arch.mmu_setup_lock.
*/
struct kvm_hpt_info hpt;
};
@ -139,7 +139,7 @@ long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order)
long err = -EBUSY;
struct kvm_hpt_info info;
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.mmu_setup_lock);
if (kvm->arch.mmu_ready) {
kvm->arch.mmu_ready = 0;
/* order mmu_ready vs. vcpus_running */
@ -183,7 +183,7 @@ out:
/* Ensure that each vcpu will flush its TLB on next entry. */
cpumask_setall(&kvm->arch.need_tlb_flush);
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
return err;
}
@ -1447,7 +1447,7 @@ static void resize_hpt_pivot(struct kvm_resize_hpt *resize)
static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize)
{
if (WARN_ON(!mutex_is_locked(&kvm->lock)))
if (WARN_ON(!mutex_is_locked(&kvm->arch.mmu_setup_lock)))
return;
if (!resize)
@ -1474,14 +1474,14 @@ static void resize_hpt_prepare_work(struct work_struct *work)
if (WARN_ON(resize->error != -EBUSY))
return;
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.mmu_setup_lock);
/* Request is still current? */
if (kvm->arch.resize_hpt == resize) {
/* We may request large allocations here:
* do not sleep with kvm->lock held for a while.
* do not sleep with kvm->arch.mmu_setup_lock held for a while.
*/
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
resize_hpt_debug(resize, "resize_hpt_prepare_work(): order = %d\n",
resize->order);
@ -1494,9 +1494,9 @@ static void resize_hpt_prepare_work(struct work_struct *work)
if (WARN_ON(err == -EBUSY))
err = -EINPROGRESS;
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.mmu_setup_lock);
/* It is possible that kvm->arch.resize_hpt != resize
* after we grab kvm->lock again.
* after we grab kvm->arch.mmu_setup_lock again.
*/
}
@ -1505,7 +1505,7 @@ static void resize_hpt_prepare_work(struct work_struct *work)
if (kvm->arch.resize_hpt != resize)
resize_hpt_release(kvm, resize);
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
}
long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm,
@ -1522,7 +1522,7 @@ long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm,
if (shift && ((shift < 18) || (shift > 46)))
return -EINVAL;
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.mmu_setup_lock);
resize = kvm->arch.resize_hpt;
@ -1565,7 +1565,7 @@ long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm,
ret = 100; /* estimated time in ms */
out:
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
return ret;
}
@ -1588,7 +1588,7 @@ long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm,
if (shift && ((shift < 18) || (shift > 46)))
return -EINVAL;
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.mmu_setup_lock);
resize = kvm->arch.resize_hpt;
@ -1625,7 +1625,7 @@ out:
smp_mb();
out_no_hpt:
resize_hpt_release(kvm, resize);
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
return ret;
}
@ -1868,7 +1868,7 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf,
return -EINVAL;
/* lock out vcpus from running while we're doing this */
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.mmu_setup_lock);
mmu_ready = kvm->arch.mmu_ready;
if (mmu_ready) {
kvm->arch.mmu_ready = 0; /* temporarily */
@ -1876,7 +1876,7 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf,
smp_mb();
if (atomic_read(&kvm->arch.vcpus_running)) {
kvm->arch.mmu_ready = 1;
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
return -EBUSY;
}
}
@ -1963,7 +1963,7 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf,
/* Order HPTE updates vs. mmu_ready */
smp_wmb();
kvm->arch.mmu_ready = mmu_ready;
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
if (err)
return err;

48
arch/powerpc/kvm/book3s_hv.c
View File

@ -446,12 +446,7 @@ static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
{
struct kvm_vcpu *ret;
mutex_lock(&kvm->lock);
ret = kvm_get_vcpu_by_id(kvm, id);
mutex_unlock(&kvm->lock);
return ret;
return kvm_get_vcpu_by_id(kvm, id);
}
static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
@ -1583,7 +1578,6 @@ static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
struct kvmppc_vcore *vc = vcpu->arch.vcore;
u64 mask;
mutex_lock(&kvm->lock);
spin_lock(&vc->lock);
/*
* If ILE (interrupt little-endian) has changed, update the
@ -1623,7 +1617,6 @@ static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
mask &= 0xFFFFFFFF;
vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
spin_unlock(&vc->lock);
mutex_unlock(&kvm->lock);
}
static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
@ -2338,11 +2331,17 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
pr_devel("KVM: collision on id %u", id);
vcore = NULL;
} else if (!vcore) {
/*
* Take mmu_setup_lock for mutual exclusion
* with kvmppc_update_lpcr().
*/
err = -ENOMEM;
vcore = kvmppc_vcore_create(kvm,
id & ~(kvm->arch.smt_mode - 1));
mutex_lock(&kvm->arch.mmu_setup_lock);
kvm->arch.vcores[core] = vcore;
kvm->arch.online_vcores++;
mutex_unlock(&kvm->arch.mmu_setup_lock);
}
}
mutex_unlock(&kvm->lock);
@ -3663,6 +3662,7 @@ int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
vc->in_guest = 0;
mtspr(SPRN_DEC, local_paca->kvm_hstate.dec_expires - mftb());
mtspr(SPRN_SPRG_VDSO_WRITE, local_paca->sprg_vdso);
kvmhv_load_host_pmu();
@ -3859,7 +3859,7 @@ static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu)
int r = 0;
struct kvm *kvm = vcpu->kvm;
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.mmu_setup_lock);
if (!kvm->arch.mmu_ready) {
if (!kvm_is_radix(kvm))
r = kvmppc_hv_setup_htab_rma(vcpu);
@ -3869,7 +3869,7 @@ static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu)
kvm->arch.mmu_ready = 1;
}
}
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
return r;
}
@ -4091,16 +4091,20 @@ int kvmhv_run_single_vcpu(struct kvm_run *kvm_run,
kvmppc_check_need_tlb_flush(kvm, pcpu, nested);
}
trace_hardirqs_on();
guest_enter_irqoff();
srcu_idx = srcu_read_lock(&kvm->srcu);
this_cpu_disable_ftrace();
/* Tell lockdep that we're about to enable interrupts */
trace_hardirqs_on();
trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr);
vcpu->arch.trap = trap;
trace_hardirqs_off();
this_cpu_enable_ftrace();
srcu_read_unlock(&kvm->srcu, srcu_idx);
@ -4110,7 +4114,6 @@ int kvmhv_run_single_vcpu(struct kvm_run *kvm_run,
isync();
}
trace_hardirqs_off();
set_irq_happened(trap);
kvmppc_set_host_core(pcpu);
@ -4478,7 +4481,8 @@ static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
/*
* Update LPCR values in kvm->arch and in vcores.
* Caller must hold kvm->lock.
* Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion
* of kvm->arch.lpcr update).
*/
void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
{
@ -4530,7 +4534,7 @@ void kvmppc_setup_partition_table(struct kvm *kvm)
/*
* Set up HPT (hashed page table) and RMA (real-mode area).
* Must be called with kvm->lock held.
* Must be called with kvm->arch.mmu_setup_lock held.
*/
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
{
@ -4618,7 +4622,10 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
goto out_srcu;
}
/* Must be called with kvm->lock held and mmu_ready = 0 and no vcpus running */
/*
* Must be called with kvm->arch.mmu_setup_lock held and
* mmu_ready = 0 and no vcpus running.
*/
int kvmppc_switch_mmu_to_hpt(struct kvm *kvm)
{
if (nesting_enabled(kvm))
@ -4635,7 +4642,10 @@ int kvmppc_switch_mmu_to_hpt(struct kvm *kvm)
return 0;
}
/* Must be called with kvm->lock held and mmu_ready = 0 and no vcpus running */
/*
* Must be called with kvm->arch.mmu_setup_lock held and
* mmu_ready = 0 and no vcpus running.
*/
int kvmppc_switch_mmu_to_radix(struct kvm *kvm)
{
int err;
@ -4740,6 +4750,8 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
char buf[32];
int ret;
mutex_init(&kvm->arch.mmu_setup_lock);
/* Allocate the guest's logical partition ID */
lpid = kvmppc_alloc_lpid();
@ -5265,7 +5277,7 @@ static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
if (kvmhv_on_pseries() && !radix)
return -EINVAL;
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.mmu_setup_lock);
if (radix != kvm_is_radix(kvm)) {
if (kvm->arch.mmu_ready) {
kvm->arch.mmu_ready = 0;
@ -5293,7 +5305,7 @@ static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
err = 0;
out_unlock:
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.mmu_setup_lock);
return err;
}

14
arch/powerpc/kvm/book3s_rtas.c
View File

@ -146,7 +146,7 @@ static int rtas_token_undefine(struct kvm *kvm, char *name)
{
struct rtas_token_definition *d, *tmp;
lockdep_assert_held(&kvm->lock);
lockdep_assert_held(&kvm->arch.rtas_token_lock);
list_for_each_entry_safe(d, tmp, &kvm->arch.rtas_tokens, list) {
if (rtas_name_matches(d->handler->name, name)) {
@ -167,7 +167,7 @@ static int rtas_token_define(struct kvm *kvm, char *name, u64 token)
bool found;
int i;
lockdep_assert_held(&kvm->lock);
lockdep_assert_held(&kvm->arch.rtas_token_lock);
list_for_each_entry(d, &kvm->arch.rtas_tokens, list) {
if (d->token == token)
@ -206,14 +206,14 @@ int kvm_vm_ioctl_rtas_define_token(struct kvm *kvm, void __user *argp)
if (copy_from_user(&args, argp, sizeof(args)))
return -EFAULT;
mutex_lock(&kvm->lock);
mutex_lock(&kvm->arch.rtas_token_lock);
if (args.token)
rc = rtas_token_define(kvm, args.name, args.token);
else
rc = rtas_token_undefine(kvm, args.name);
mutex_unlock(&kvm->lock);
mutex_unlock(&kvm->arch.rtas_token_lock);
return rc;
}
@ -245,7 +245,7 @@ int kvmppc_rtas_hcall(struct kvm_vcpu *vcpu)
orig_rets = args.rets;
args.rets = &args.args[be32_to_cpu(args.nargs)];
mutex_lock(&vcpu->kvm->lock);
mutex_lock(&vcpu->kvm->arch.rtas_token_lock);
rc = -ENOENT;
list_for_each_entry(d, &vcpu->kvm->arch.rtas_tokens, list) {
@ -256,7 +256,7 @@ int kvmppc_rtas_hcall(struct kvm_vcpu *vcpu)
}
}
mutex_unlock(&vcpu->kvm->lock);
mutex_unlock(&vcpu->kvm->arch.rtas_token_lock);
if (rc == 0) {
args.rets = orig_rets;
@ -282,8 +282,6 @@ void kvmppc_rtas_tokens_free(struct kvm *kvm)
{
struct rtas_token_definition *d, *tmp;
lockdep_assert_held(&kvm->lock);
list_for_each_entry_safe(d, tmp, &kvm->arch.rtas_tokens, list) {
list_del(&d->list);
kfree(d);

55
arch/powerpc/kvm/book3s_xive.c
View File

@ -271,14 +271,14 @@ static int xive_provision_queue(struct kvm_vcpu *vcpu, u8 prio)
return rc;
}
/* Called with kvm_lock held */
/* Called with xive->lock held */
static int xive_check_provisioning(struct kvm *kvm, u8 prio)
{
struct kvmppc_xive *xive = kvm->arch.xive;
struct kvm_vcpu *vcpu;
int i, rc;
lockdep_assert_held(&kvm->lock);
lockdep_assert_held(&xive->lock);
/* Already provisioned ? */
if (xive->qmap & (1 << prio))
@ -621,9 +621,12 @@ int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server,
irq, server, priority);
/* First, check provisioning of queues */
if (priority != MASKED)
if (priority != MASKED) {
mutex_lock(&xive->lock);
rc = xive_check_provisioning(xive->kvm,
xive_prio_from_guest(priority));
mutex_unlock(&xive->lock);
}
if (rc) {
pr_devel(" provisioning failure %d !\n", rc);
return rc;
@ -1199,7 +1202,7 @@ int kvmppc_xive_connect_vcpu(struct kvm_device *dev,
return -ENOMEM;
/* We need to synchronize with queue provisioning */
mutex_lock(&vcpu->kvm->lock);
mutex_lock(&xive->lock);
vcpu->arch.xive_vcpu = xc;
xc->xive = xive;
xc->vcpu = vcpu;
@ -1283,7 +1286,7 @@ int kvmppc_xive_connect_vcpu(struct kvm_device *dev,
xive_vm_esb_load(&xc->vp_ipi_data, XIVE_ESB_SET_PQ_00);
bail:
mutex_unlock(&vcpu->kvm->lock);
mutex_unlock(&xive->lock);
if (r) {
kvmppc_xive_cleanup_vcpu(vcpu);
return r;
@ -1527,13 +1530,12 @@ static int xive_get_source(struct kvmppc_xive *xive, long irq, u64 addr)
struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
struct kvmppc_xive *xive, int irq)
{
struct kvm *kvm = xive->kvm;
struct kvmppc_xive_src_block *sb;
int i, bid;
bid = irq >> KVMPPC_XICS_ICS_SHIFT;
mutex_lock(&kvm->lock);
mutex_lock(&xive->lock);
/* block already exists - somebody else got here first */
if (xive->src_blocks[bid])
@ -1560,7 +1562,7 @@ struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
xive->max_sbid = bid;
out:
mutex_unlock(&kvm->lock);
mutex_unlock(&xive->lock);
return xive->src_blocks[bid];
}
@ -1670,9 +1672,9 @@ static int xive_set_source(struct kvmppc_xive *xive, long irq, u64 addr)
/* If we have a priority target the interrupt */
if (act_prio != MASKED) {
/* First, check provisioning of queues */
mutex_lock(&xive->kvm->lock);
mutex_lock(&xive->lock);
rc = xive_check_provisioning(xive->kvm, act_prio);
mutex_unlock(&xive->kvm->lock);
mutex_unlock(&xive->lock);
/* Target interrupt */
if (rc == 0)
@ -1826,7 +1828,6 @@ static void kvmppc_xive_cleanup_irq(u32 hw_num, struct xive_irq_data *xd)
{
xive_vm_esb_load(xd, XIVE_ESB_SET_PQ_01);
xive_native_configure_irq(hw_num, 0, MASKED, 0);
xive_cleanup_irq_data(xd);
}
void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb)
@ -1840,9 +1841,10 @@ void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb)
continue;
kvmppc_xive_cleanup_irq(state->ipi_number, &state->ipi_data);
xive_cleanup_irq_data(&state->ipi_data);
xive_native_free_irq(state->ipi_number);
/* Pass-through, cleanup too */
/* Pass-through, cleanup too but keep IRQ hw data */
if (state->pt_number)
kvmppc_xive_cleanup_irq(state->pt_number, state->pt_data);
@ -1859,21 +1861,10 @@ static void kvmppc_xive_release(struct kvm_device *dev)
struct kvm *kvm = xive->kvm;
struct kvm_vcpu *vcpu;
int i;
int was_ready;
pr_devel("Releasing xive device\n");
debugfs_remove(xive->dentry);
/*
* Clearing mmu_ready temporarily while holding kvm->lock
* is a way of ensuring that no vcpus can enter the guest
* until we drop kvm->lock. Doing kick_all_cpus_sync()
* ensures that any vcpu executing inside the guest has
* exited the guest. Once kick_all_cpus_sync() has finished,
* we know that no vcpu can be executing the XIVE push or
* pull code, or executing a XICS hcall.
*
* Since this is the device release function, we know that
* userspace does not have any open fd referring to the
* device. Therefore there can not be any of the device
@ -1881,9 +1872,8 @@ static void kvmppc_xive_release(struct kvm_device *dev)
* and similarly, the connect_vcpu and set/clr_mapped
* functions also cannot be being executed.
*/
was_ready = kvm->arch.mmu_ready;
kvm->arch.mmu_ready = 0;
kick_all_cpus_sync();
debugfs_remove(xive->dentry);
/*
* We should clean up the vCPU interrupt presenters first.
@ -1892,12 +1882,22 @@ static void kvmppc_xive_release(struct kvm_device *dev)
/*
* Take vcpu->mutex to ensure that no one_reg get/set ioctl
* (i.e. kvmppc_xive_[gs]et_icp) can be done concurrently.
* Holding the vcpu->mutex also means that the vcpu cannot
* be executing the KVM_RUN ioctl, and therefore it cannot
* be executing the XIVE push or pull code or accessing
* the XIVE MMIO regions.
*/
mutex_lock(&vcpu->mutex);
kvmppc_xive_cleanup_vcpu(vcpu);
mutex_unlock(&vcpu->mutex);
}
/*
* Now that we have cleared vcpu->arch.xive_vcpu, vcpu->arch.irq_type
* and vcpu->arch.xive_esc_[vr]addr on each vcpu, we are safe
* against xive code getting called during vcpu execution or
* set/get one_reg operations.
*/
kvm->arch.xive = NULL;
/* Mask and free interrupts */
@ -1911,8 +1911,6 @@ static void kvmppc_xive_release(struct kvm_device *dev)
if (xive->vp_base != XIVE_INVALID_VP)
xive_native_free_vp_block(xive->vp_base);
kvm->arch.mmu_ready = was_ready;
/*
* A reference of the kvmppc_xive pointer is now kept under
* the xive_devices struct of the machine for reuse. It is
@ -1967,6 +1965,7 @@ static int kvmppc_xive_create(struct kvm_device *dev, u32 type)
dev->private = xive;
xive->dev = dev;
xive->kvm = kvm;
mutex_init(&xive->lock);
/* Already there ? */
if (kvm->arch.xive)

1
arch/powerpc/kvm/book3s_xive.h
View File

@ -141,6 +141,7 @@ struct kvmppc_xive {
struct kvmppc_xive_ops *ops;
struct address_space *mapping;
struct mutex mapping_lock;
struct mutex lock;
};
#define KVMPPC_XIVE_Q_COUNT 8

100
arch/powerpc/kvm/book3s_xive_native.c
View File

@ -109,12 +109,12 @@ int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
return -EPERM;
if (vcpu->arch.irq_type != KVMPPC_IRQ_DEFAULT)
return -EBUSY;
if (server_num >= KVM_MAX_VCPUS) {
if (server_num >= (KVM_MAX_VCPUS * vcpu->kvm->arch.emul_smt_mode)) {
pr_devel("Out of bounds !\n");
return -EINVAL;
}
mutex_lock(&vcpu->kvm->lock);
mutex_lock(&xive->lock);
if (kvmppc_xive_find_server(vcpu->kvm, server_num)) {
pr_devel("Duplicate !\n");
@ -159,7 +159,7 @@ int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
/* TODO: reset all queues to a clean state ? */
bail:
mutex_unlock(&vcpu->kvm->lock);
mutex_unlock(&xive->lock);
if (rc)
kvmppc_xive_native_cleanup_vcpu(vcpu);
@ -172,6 +172,7 @@ bail:
static int kvmppc_xive_native_reset_mapped(struct kvm *kvm, unsigned long irq)
{
struct kvmppc_xive *xive = kvm->arch.xive;
pgoff_t esb_pgoff = KVM_XIVE_ESB_PAGE_OFFSET + irq * 2;
if (irq >= KVMPPC_XIVE_NR_IRQS)
return -EINVAL;
@ -185,7 +186,7 @@ static int kvmppc_xive_native_reset_mapped(struct kvm *kvm, unsigned long irq)
mutex_lock(&xive->mapping_lock);
if (xive->mapping)
unmap_mapping_range(xive->mapping,
irq * (2ull << PAGE_SHIFT),
esb_pgoff << PAGE_SHIFT,
2ull << PAGE_SHIFT, 1);
mutex_unlock(&xive->mapping_lock);
return 0;
@ -535,6 +536,7 @@ static int kvmppc_xive_native_set_queue_config(struct kvmppc_xive *xive,
struct xive_q *q;
gfn_t gfn;
unsigned long page_size;
int srcu_idx;
/*
* Demangle priority/server tuple from the EQ identifier
@ -565,24 +567,6 @@ static int kvmppc_xive_native_set_queue_config(struct kvmppc_xive *xive,
__func__, server, priority, kvm_eq.flags,
kvm_eq.qshift, kvm_eq.qaddr, kvm_eq.qtoggle, kvm_eq.qindex);
/*
* sPAPR specifies a "Unconditional Notify (n) flag" for the
* H_INT_SET_QUEUE_CONFIG hcall which forces notification
* without using the coalescing mechanisms provided by the
* XIVE END ESBs. This is required on KVM as notification
* using the END ESBs is not supported.
*/
if (kvm_eq.flags != KVM_XIVE_EQ_ALWAYS_NOTIFY) {
pr_err("invalid flags %d\n", kvm_eq.flags);
return -EINVAL;
}
rc = xive_native_validate_queue_size(kvm_eq.qshift);
if (rc) {
pr_err("invalid queue size %d\n", kvm_eq.qshift);
return rc;
}
/* reset queue and disable queueing */
if (!kvm_eq.qshift) {
q->guest_qaddr = 0;
@ -604,26 +588,48 @@ static int kvmppc_xive_native_set_queue_config(struct kvmppc_xive *xive,
return 0;
}
/*
* sPAPR specifies a "Unconditional Notify (n) flag" for the
* H_INT_SET_QUEUE_CONFIG hcall which forces notification
* without using the coalescing mechanisms provided by the
* XIVE END ESBs. This is required on KVM as notification
* using the END ESBs is not supported.
*/
if (kvm_eq.flags != KVM_XIVE_EQ_ALWAYS_NOTIFY) {
pr_err("invalid flags %d\n", kvm_eq.flags);
return -EINVAL;
}
rc = xive_native_validate_queue_size(kvm_eq.qshift);
if (rc) {
pr_err("invalid queue size %d\n", kvm_eq.qshift);
return rc;
}
if (kvm_eq.qaddr & ((1ull << kvm_eq.qshift) - 1)) {
pr_err("queue page is not aligned %llx/%llx\n", kvm_eq.qaddr,
1ull << kvm_eq.qshift);
return -EINVAL;
}
srcu_idx = srcu_read_lock(&kvm->srcu);
gfn = gpa_to_gfn(kvm_eq.qaddr);
page = gfn_to_page(kvm, gfn);
if (is_error_page(page)) {
srcu_read_unlock(&kvm->srcu, srcu_idx);
pr_err("Couldn't get queue page %llx!\n", kvm_eq.qaddr);
return -EINVAL;
}
page_size = kvm_host_page_size(kvm, gfn);
if (1ull << kvm_eq.qshift > page_size) {
srcu_read_unlock(&kvm->srcu, srcu_idx);
pr_warn("Incompatible host page size %lx!\n", page_size);
return -EINVAL;
}
qaddr = page_to_virt(page) + (kvm_eq.qaddr & ~PAGE_MASK);
srcu_read_unlock(&kvm->srcu, srcu_idx);
/*
* Backup the queue page guest address to the mark EQ page
@ -772,7 +778,7 @@ static int kvmppc_xive_reset(struct kvmppc_xive *xive)
pr_devel("%s\n", __func__);
mutex_lock(&kvm->lock);
mutex_lock(&xive->lock);
kvm_for_each_vcpu(i, vcpu, kvm) {
struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
@ -810,7 +816,7 @@ static int kvmppc_xive_reset(struct kvmppc_xive *xive)
}
}
mutex_unlock(&kvm->lock);
mutex_unlock(&xive->lock);
return 0;
}
@ -854,6 +860,7 @@ static int kvmppc_xive_native_vcpu_eq_sync(struct kvm_vcpu *vcpu)
{
struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
unsigned int prio;
int srcu_idx;
if (!xc)
return -ENOENT;
@ -865,7 +872,9 @@ static int kvmppc_xive_native_vcpu_eq_sync(struct kvm_vcpu *vcpu)
continue;
/* Mark EQ page dirty for migration */
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
mark_page_dirty(vcpu->kvm, gpa_to_gfn(q->guest_qaddr));
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
}
return 0;
}
@ -878,7 +887,7 @@ static int kvmppc_xive_native_eq_sync(struct kvmppc_xive *xive)
pr_devel("%s\n", __func__);
mutex_lock(&kvm->lock);
mutex_lock(&xive->lock);
for (i = 0; i <= xive->max_sbid; i++) {
struct kvmppc_xive_src_block *sb = xive->src_blocks[i];
@ -892,7 +901,7 @@ static int kvmppc_xive_native_eq_sync(struct kvmppc_xive *xive)
kvm_for_each_vcpu(i, vcpu, kvm) {
kvmppc_xive_native_vcpu_eq_sync(vcpu);
}
mutex_unlock(&kvm->lock);
mutex_unlock(&xive->lock);
return 0;
}
@ -965,7 +974,7 @@ static int kvmppc_xive_native_has_attr(struct kvm_device *dev,
}
/*
* Called when device fd is closed
* Called when device fd is closed. kvm->lock is held.
*/
static void kvmppc_xive_native_release(struct kvm_device *dev)
{
@ -973,21 +982,18 @@ static void kvmppc_xive_native_release(struct kvm_device *dev)
struct kvm *kvm = xive->kvm;
struct kvm_vcpu *vcpu;
int i;
int was_ready;
debugfs_remove(xive->dentry);
pr_devel("Releasing xive native device\n");
/*
* Clearing mmu_ready temporarily while holding kvm->lock
* is a way of ensuring that no vcpus can enter the guest
* until we drop kvm->lock. Doing kick_all_cpus_sync()
* ensures that any vcpu executing inside the guest has
* exited the guest. Once kick_all_cpus_sync() has finished,
* we know that no vcpu can be executing the XIVE push or
* pull code or accessing the XIVE MMIO regions.
*
* Clear the KVM device file address_space which is used to
* unmap the ESB pages when a device is passed-through.
*/
mutex_lock(&xive->mapping_lock);
xive->mapping = NULL;
mutex_unlock(&xive->mapping_lock);
/*
* Since this is the device release function, we know that
* userspace does not have any open fd or mmap referring to
* the device. Therefore there can not be any of the
@ -996,9 +1002,8 @@ static void kvmppc_xive_native_release(struct kvm_device *dev)
* connect_vcpu and set/clr_mapped functions also cannot
* be being executed.
*/
was_ready = kvm->arch.mmu_ready;
kvm->arch.mmu_ready = 0;
kick_all_cpus_sync();
debugfs_remove(xive->dentry);
/*
* We should clean up the vCPU interrupt presenters first.
@ -1007,12 +1012,22 @@ static void kvmppc_xive_native_release(struct kvm_device *dev)
/*
* Take vcpu->mutex to ensure that no one_reg get/set ioctl
* (i.e. kvmppc_xive_native_[gs]et_vp) can be being done.
* Holding the vcpu->mutex also means that the vcpu cannot
* be executing the KVM_RUN ioctl, and therefore it cannot
* be executing the XIVE push or pull code or accessing
* the XIVE MMIO regions.
*/
mutex_lock(&vcpu->mutex);
kvmppc_xive_native_cleanup_vcpu(vcpu);
mutex_unlock(&vcpu->mutex);
}
/*
* Now that we have cleared vcpu->arch.xive_vcpu, vcpu->arch.irq_type
* and vcpu->arch.xive_esc_[vr]addr on each vcpu, we are safe
* against xive code getting called during vcpu execution or
* set/get one_reg operations.
*/
kvm->arch.xive = NULL;
for (i = 0; i <= xive->max_sbid; i++) {
@ -1025,8 +1040,6 @@ static void kvmppc_xive_native_release(struct kvm_device *dev)
if (xive->vp_base != XIVE_INVALID_VP)
xive_native_free_vp_block(xive->vp_base);
kvm->arch.mmu_ready = was_ready;
/*
* A reference of the kvmppc_xive pointer is now kept under
* the xive_devices struct of the machine for reuse. It is
@ -1060,6 +1073,7 @@ static int kvmppc_xive_native_create(struct kvm_device *dev, u32 type)
xive->kvm = kvm;
kvm->arch.xive = xive;
mutex_init(&xive->mapping_lock);
mutex_init(&xive->lock);
/*
* Allocate a bunch of VPs. KVM_MAX_VCPUS is a large value for

3
arch/powerpc/kvm/powerpc.c
View File

@ -657,6 +657,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_MAX_VCPU_ID:
r = KVM_MAX_VCPU_ID;
break;
#ifdef CONFIG_PPC_BOOK3S_64
case KVM_CAP_PPC_GET_SMMU_INFO:
r = 1;

1
arch/s390/kvm/kvm-s390.c
View File

@ -539,6 +539,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
break;
case KVM_CAP_NR_VCPUS:
case KVM_CAP_MAX_VCPUS:
case KVM_CAP_MAX_VCPU_ID:
r = KVM_S390_BSCA_CPU_SLOTS;
if (!kvm_s390_use_sca_entries())
r = KVM_MAX_VCPUS;

3
arch/x86/kvm/x86.c
View File

@ -3122,6 +3122,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_MAX_VCPU_ID:
r = KVM_MAX_VCPU_ID;
break;
case KVM_CAP_PV_MMU: /* obsolete */
r = 0;
break;

3
virt/kvm/arm/arm.c
View File

@ -224,6 +224,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_MAX_VCPU_ID:
r = KVM_MAX_VCPU_ID;
break;
case KVM_CAP_MSI_DEVID:
if (!kvm)
r = -EINVAL;

4
virt/kvm/kvm_main.c
View File

@ -1795,8 +1795,10 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map,
if (map->page)
kunmap(map->page);
#ifdef CONFIG_HAS_IOMEM
else
memunmap(map->hva);
#endif
if (dirty) {
kvm_vcpu_mark_page_dirty(vcpu, map->gfn);
@ -3149,8 +3151,6 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
case KVM_CAP_MULTI_ADDRESS_SPACE:
return KVM_ADDRESS_SPACE_NUM;
#endif
case KVM_CAP_MAX_VCPU_ID:
return KVM_MAX_VCPU_ID;
case KVM_CAP_NR_MEMSLOTS:
return KVM_USER_MEM_SLOTS;
default: