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-rw-r--r--arch/s390/kvm/Kconfig1
-rw-r--r--arch/s390/kvm/Makefile1
-rw-r--r--arch/s390/kvm/gaccess.c96
-rw-r--r--arch/s390/kvm/gaccess.h6
-rw-r--r--arch/s390/kvm/intercept.c15
-rw-r--r--arch/s390/kvm/interrupt.c98
-rw-r--r--arch/s390/kvm/kvm-s390.c482
-rw-r--r--arch/s390/kvm/kvm-s390.h16
-rw-r--r--arch/s390/kvm/pci.c690
-rw-r--r--arch/s390/kvm/pci.h87
-rw-r--r--arch/s390/kvm/priv.c26
-rw-r--r--arch/s390/kvm/pv.c269
-rw-r--r--arch/s390/kvm/sigp.c4
-rw-r--r--arch/s390/kvm/vsie.c8
14 files changed, 1715 insertions, 84 deletions
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index 2e84d3922f7c..33f4ff909476 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -34,6 +34,7 @@ config KVM
select SRCU
select KVM_VFIO
select INTERVAL_TREE
+ select MMU_NOTIFIER
help
Support hosting paravirtualized guest machines using the SIE
virtualization capability on the mainframe. This should work
diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
index 26f4a74e5ce4..02217fb4ae10 100644
--- a/arch/s390/kvm/Makefile
+++ b/arch/s390/kvm/Makefile
@@ -10,4 +10,5 @@ ccflags-y := -Ivirt/kvm -Iarch/s390/kvm
kvm-y += kvm-s390.o intercept.o interrupt.o priv.o sigp.o
kvm-y += diag.o gaccess.o guestdbg.o vsie.o pv.o
+kvm-$(CONFIG_VFIO_PCI_ZDEV_KVM) += pci.o
obj-$(CONFIG_KVM) += kvm.o
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 227ed0009354..082ec5f2c3a5 100644
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -262,77 +262,77 @@ struct aste {
/* .. more fields there */
};
-int ipte_lock_held(struct kvm_vcpu *vcpu)
+int ipte_lock_held(struct kvm *kvm)
{
- if (vcpu->arch.sie_block->eca & ECA_SII) {
+ if (sclp.has_siif) {
int rc;
- read_lock(&vcpu->kvm->arch.sca_lock);
- rc = kvm_s390_get_ipte_control(vcpu->kvm)->kh != 0;
- read_unlock(&vcpu->kvm->arch.sca_lock);
+ read_lock(&kvm->arch.sca_lock);
+ rc = kvm_s390_get_ipte_control(kvm)->kh != 0;
+ read_unlock(&kvm->arch.sca_lock);
return rc;
}
- return vcpu->kvm->arch.ipte_lock_count != 0;
+ return kvm->arch.ipte_lock_count != 0;
}
-static void ipte_lock_simple(struct kvm_vcpu *vcpu)
+static void ipte_lock_simple(struct kvm *kvm)
{
union ipte_control old, new, *ic;
- mutex_lock(&vcpu->kvm->arch.ipte_mutex);
- vcpu->kvm->arch.ipte_lock_count++;
- if (vcpu->kvm->arch.ipte_lock_count > 1)
+ mutex_lock(&kvm->arch.ipte_mutex);
+ kvm->arch.ipte_lock_count++;
+ if (kvm->arch.ipte_lock_count > 1)
goto out;
retry:
- read_lock(&vcpu->kvm->arch.sca_lock);
- ic = kvm_s390_get_ipte_control(vcpu->kvm);
+ read_lock(&kvm->arch.sca_lock);
+ ic = kvm_s390_get_ipte_control(kvm);
do {
old = READ_ONCE(*ic);
if (old.k) {
- read_unlock(&vcpu->kvm->arch.sca_lock);
+ read_unlock(&kvm->arch.sca_lock);
cond_resched();
goto retry;
}
new = old;
new.k = 1;
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
- read_unlock(&vcpu->kvm->arch.sca_lock);
+ read_unlock(&kvm->arch.sca_lock);
out:
- mutex_unlock(&vcpu->kvm->arch.ipte_mutex);
+ mutex_unlock(&kvm->arch.ipte_mutex);
}
-static void ipte_unlock_simple(struct kvm_vcpu *vcpu)
+static void ipte_unlock_simple(struct kvm *kvm)
{
union ipte_control old, new, *ic;
- mutex_lock(&vcpu->kvm->arch.ipte_mutex);
- vcpu->kvm->arch.ipte_lock_count--;
- if (vcpu->kvm->arch.ipte_lock_count)
+ mutex_lock(&kvm->arch.ipte_mutex);
+ kvm->arch.ipte_lock_count--;
+ if (kvm->arch.ipte_lock_count)
goto out;
- read_lock(&vcpu->kvm->arch.sca_lock);
- ic = kvm_s390_get_ipte_control(vcpu->kvm);
+ read_lock(&kvm->arch.sca_lock);
+ ic = kvm_s390_get_ipte_control(kvm);
do {
old = READ_ONCE(*ic);
new = old;
new.k = 0;
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
- read_unlock(&vcpu->kvm->arch.sca_lock);
- wake_up(&vcpu->kvm->arch.ipte_wq);
+ read_unlock(&kvm->arch.sca_lock);
+ wake_up(&kvm->arch.ipte_wq);
out:
- mutex_unlock(&vcpu->kvm->arch.ipte_mutex);
+ mutex_unlock(&kvm->arch.ipte_mutex);
}
-static void ipte_lock_siif(struct kvm_vcpu *vcpu)
+static void ipte_lock_siif(struct kvm *kvm)
{
union ipte_control old, new, *ic;
retry:
- read_lock(&vcpu->kvm->arch.sca_lock);
- ic = kvm_s390_get_ipte_control(vcpu->kvm);
+ read_lock(&kvm->arch.sca_lock);
+ ic = kvm_s390_get_ipte_control(kvm);
do {
old = READ_ONCE(*ic);
if (old.kg) {
- read_unlock(&vcpu->kvm->arch.sca_lock);
+ read_unlock(&kvm->arch.sca_lock);
cond_resched();
goto retry;
}
@@ -340,15 +340,15 @@ retry:
new.k = 1;
new.kh++;
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
- read_unlock(&vcpu->kvm->arch.sca_lock);
+ read_unlock(&kvm->arch.sca_lock);
}
-static void ipte_unlock_siif(struct kvm_vcpu *vcpu)
+static void ipte_unlock_siif(struct kvm *kvm)
{
union ipte_control old, new, *ic;
- read_lock(&vcpu->kvm->arch.sca_lock);
- ic = kvm_s390_get_ipte_control(vcpu->kvm);
+ read_lock(&kvm->arch.sca_lock);
+ ic = kvm_s390_get_ipte_control(kvm);
do {
old = READ_ONCE(*ic);
new = old;
@@ -356,25 +356,25 @@ static void ipte_unlock_siif(struct kvm_vcpu *vcpu)
if (!new.kh)
new.k = 0;
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
- read_unlock(&vcpu->kvm->arch.sca_lock);
+ read_unlock(&kvm->arch.sca_lock);
if (!new.kh)
- wake_up(&vcpu->kvm->arch.ipte_wq);
+ wake_up(&kvm->arch.ipte_wq);
}
-void ipte_lock(struct kvm_vcpu *vcpu)
+void ipte_lock(struct kvm *kvm)
{
- if (vcpu->arch.sie_block->eca & ECA_SII)
- ipte_lock_siif(vcpu);
+ if (sclp.has_siif)
+ ipte_lock_siif(kvm);
else
- ipte_lock_simple(vcpu);
+ ipte_lock_simple(kvm);
}
-void ipte_unlock(struct kvm_vcpu *vcpu)
+void ipte_unlock(struct kvm *kvm)
{
- if (vcpu->arch.sie_block->eca & ECA_SII)
- ipte_unlock_siif(vcpu);
+ if (sclp.has_siif)
+ ipte_unlock_siif(kvm);
else
- ipte_unlock_simple(vcpu);
+ ipte_unlock_simple(kvm);
}
static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, u8 ar,
@@ -1086,7 +1086,7 @@ int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
try_storage_prot_override = storage_prot_override_applicable(vcpu);
need_ipte_lock = psw_bits(*psw).dat && !asce.r;
if (need_ipte_lock)
- ipte_lock(vcpu);
+ ipte_lock(vcpu->kvm);
/*
* Since we do the access further down ultimately via a move instruction
* that does key checking and returns an error in case of a protection
@@ -1127,7 +1127,7 @@ int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
}
out_unlock:
if (need_ipte_lock)
- ipte_unlock(vcpu);
+ ipte_unlock(vcpu->kvm);
if (nr_pages > ARRAY_SIZE(gpa_array))
vfree(gpas);
return rc;
@@ -1199,10 +1199,10 @@ int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
rc = get_vcpu_asce(vcpu, &asce, gva, ar, mode);
if (rc)
return rc;
- ipte_lock(vcpu);
+ ipte_lock(vcpu->kvm);
rc = guest_range_to_gpas(vcpu, gva, ar, NULL, length, asce, mode,
access_key);
- ipte_unlock(vcpu);
+ ipte_unlock(vcpu->kvm);
return rc;
}
@@ -1465,7 +1465,7 @@ int kvm_s390_shadow_fault(struct kvm_vcpu *vcpu, struct gmap *sg,
* tables/pointers we read stay valid - unshadowing is however
* always possible - only guest_table_lock protects us.
*/
- ipte_lock(vcpu);
+ ipte_lock(vcpu->kvm);
rc = gmap_shadow_pgt_lookup(sg, saddr, &pgt, &dat_protection, &fake);
if (rc)
@@ -1499,7 +1499,7 @@ shadow_page:
pte.p |= dat_protection;
if (!rc)
rc = gmap_shadow_page(sg, saddr, __pte(pte.val));
- ipte_unlock(vcpu);
+ ipte_unlock(vcpu->kvm);
mmap_read_unlock(sg->mm);
return rc;
}
diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h
index 1124ff282012..9408d6cc8e2c 100644
--- a/arch/s390/kvm/gaccess.h
+++ b/arch/s390/kvm/gaccess.h
@@ -440,9 +440,9 @@ int read_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
return access_guest_real(vcpu, gra, data, len, 0);
}
-void ipte_lock(struct kvm_vcpu *vcpu);
-void ipte_unlock(struct kvm_vcpu *vcpu);
-int ipte_lock_held(struct kvm_vcpu *vcpu);
+void ipte_lock(struct kvm *kvm);
+void ipte_unlock(struct kvm *kvm);
+int ipte_lock_held(struct kvm *kvm);
int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra);
/* MVPG PEI indication bits */
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 8bd42a20d924..88112065d941 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -528,12 +528,27 @@ static int handle_pv_uvc(struct kvm_vcpu *vcpu)
static int handle_pv_notification(struct kvm_vcpu *vcpu)
{
+ int ret;
+
if (vcpu->arch.sie_block->ipa == 0xb210)
return handle_pv_spx(vcpu);
if (vcpu->arch.sie_block->ipa == 0xb220)
return handle_pv_sclp(vcpu);
if (vcpu->arch.sie_block->ipa == 0xb9a4)
return handle_pv_uvc(vcpu);
+ if (vcpu->arch.sie_block->ipa >> 8 == 0xae) {
+ /*
+ * Besides external call, other SIGP orders also cause a
+ * 108 (pv notify) intercept. In contrast to external call,
+ * these orders need to be emulated and hence the appropriate
+ * place to handle them is in handle_instruction().
+ * So first try kvm_s390_handle_sigp_pei() and if that isn't
+ * successful, go on with handle_instruction().
+ */
+ ret = kvm_s390_handle_sigp_pei(vcpu);
+ if (!ret)
+ return ret;
+ }
return handle_instruction(vcpu);
}
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index af96dc0549a4..b9c944b262c7 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -28,9 +28,11 @@
#include <asm/switch_to.h>
#include <asm/nmi.h>
#include <asm/airq.h>
+#include <asm/tpi.h>
#include "kvm-s390.h"
#include "gaccess.h"
#include "trace-s390.h"
+#include "pci.h"
#define PFAULT_INIT 0x0600
#define PFAULT_DONE 0x0680
@@ -702,7 +704,7 @@ static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
/*
* We indicate floating repressible conditions along with
* other pending conditions. Channel Report Pending and Channel
- * Subsystem damage are the only two and and are indicated by
+ * Subsystem damage are the only two and are indicated by
* bits in mcic and masked in cr14.
*/
if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
@@ -3311,10 +3313,87 @@ out:
}
EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
-static void gib_alert_irq_handler(struct airq_struct *airq, bool floating)
+static void aen_host_forward(unsigned long si)
{
+ struct kvm_s390_gisa_interrupt *gi;
+ struct zpci_gaite *gaite;
+ struct kvm *kvm;
+
+ gaite = (struct zpci_gaite *)aift->gait +
+ (si * sizeof(struct zpci_gaite));
+ if (gaite->count == 0)
+ return;
+ if (gaite->aisb != 0)
+ set_bit_inv(gaite->aisbo, (unsigned long *)gaite->aisb);
+
+ kvm = kvm_s390_pci_si_to_kvm(aift, si);
+ if (!kvm)
+ return;
+ gi = &kvm->arch.gisa_int;
+
+ if (!(gi->origin->g1.simm & AIS_MODE_MASK(gaite->gisc)) ||
+ !(gi->origin->g1.nimm & AIS_MODE_MASK(gaite->gisc))) {
+ gisa_set_ipm_gisc(gi->origin, gaite->gisc);
+ if (hrtimer_active(&gi->timer))
+ hrtimer_cancel(&gi->timer);
+ hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
+ kvm->stat.aen_forward++;
+ }
+}
+
+static void aen_process_gait(u8 isc)
+{
+ bool found = false, first = true;
+ union zpci_sic_iib iib = {{0}};
+ unsigned long si, flags;
+
+ spin_lock_irqsave(&aift->gait_lock, flags);
+
+ if (!aift->gait) {
+ spin_unlock_irqrestore(&aift->gait_lock, flags);
+ return;
+ }
+
+ for (si = 0;;) {
+ /* Scan adapter summary indicator bit vector */
+ si = airq_iv_scan(aift->sbv, si, airq_iv_end(aift->sbv));
+ if (si == -1UL) {
+ if (first || found) {
+ /* Re-enable interrupts. */
+ zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, isc,
+ &iib);
+ first = found = false;
+ } else {
+ /* Interrupts on and all bits processed */
+ break;
+ }
+ found = false;
+ si = 0;
+ /* Scan again after re-enabling interrupts */
+ continue;
+ }
+ found = true;
+ aen_host_forward(si);
+ }
+
+ spin_unlock_irqrestore(&aift->gait_lock, flags);
+}
+
+static void gib_alert_irq_handler(struct airq_struct *airq,
+ struct tpi_info *tpi_info)
+{
+ struct tpi_adapter_info *info = (struct tpi_adapter_info *)tpi_info;
+
inc_irq_stat(IRQIO_GAL);
- process_gib_alert_list();
+
+ if ((info->forward || info->error) &&
+ IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
+ aen_process_gait(info->isc);
+ if (info->aism != 0)
+ process_gib_alert_list();
+ } else {
+ process_gib_alert_list();
+ }
}
static struct airq_struct gib_alert_irq = {
@@ -3326,6 +3405,11 @@ void kvm_s390_gib_destroy(void)
{
if (!gib)
return;
+ if (kvm_s390_pci_interp_allowed() && aift) {
+ mutex_lock(&aift->aift_lock);
+ kvm_s390_pci_aen_exit();
+ mutex_unlock(&aift->aift_lock);
+ }
chsc_sgib(0);
unregister_adapter_interrupt(&gib_alert_irq);
free_page((unsigned long)gib);
@@ -3363,6 +3447,14 @@ int kvm_s390_gib_init(u8 nisc)
goto out_unreg_gal;
}
+ if (kvm_s390_pci_interp_allowed()) {
+ if (kvm_s390_pci_aen_init(nisc)) {
+ pr_err("Initializing AEN for PCI failed\n");
+ rc = -EIO;
+ goto out_unreg_gal;
+ }
+ }
+
KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
goto out;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 8fcb56141689..edfd4bbd0cba 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -31,6 +31,7 @@
#include <linux/sched/signal.h>
#include <linux/string.h>
#include <linux/pgtable.h>
+#include <linux/mmu_notifier.h>
#include <asm/asm-offsets.h>
#include <asm/lowcore.h>
@@ -47,6 +48,7 @@
#include <asm/fpu/api.h>
#include "kvm-s390.h"
#include "gaccess.h"
+#include "pci.h"
#define CREATE_TRACE_POINTS
#include "trace.h"
@@ -63,7 +65,8 @@ const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
STATS_DESC_COUNTER(VM, inject_float_mchk),
STATS_DESC_COUNTER(VM, inject_pfault_done),
STATS_DESC_COUNTER(VM, inject_service_signal),
- STATS_DESC_COUNTER(VM, inject_virtio)
+ STATS_DESC_COUNTER(VM, inject_virtio),
+ STATS_DESC_COUNTER(VM, aen_forward)
};
const struct kvm_stats_header kvm_vm_stats_header = {
@@ -502,6 +505,14 @@ int kvm_arch_init(void *opaque)
goto out;
}
+ if (kvm_s390_pci_interp_allowed()) {
+ rc = kvm_s390_pci_init();
+ if (rc) {
+ pr_err("Unable to allocate AIFT for PCI\n");
+ goto out;
+ }
+ }
+
rc = kvm_s390_gib_init(GAL_ISC);
if (rc)
goto out;
@@ -516,6 +527,8 @@ out:
void kvm_arch_exit(void)
{
kvm_s390_gib_destroy();
+ if (kvm_s390_pci_interp_allowed())
+ kvm_s390_pci_exit();
debug_unregister(kvm_s390_dbf);
debug_unregister(kvm_s390_dbf_uv);
}
@@ -606,6 +619,32 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_S390_PROTECTED:
r = is_prot_virt_host();
break;
+ case KVM_CAP_S390_PROTECTED_DUMP: {
+ u64 pv_cmds_dump[] = {
+ BIT_UVC_CMD_DUMP_INIT,
+ BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE,
+ BIT_UVC_CMD_DUMP_CPU,
+ BIT_UVC_CMD_DUMP_COMPLETE,
+ };
+ int i;
+
+ r = is_prot_virt_host();
+
+ for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) {
+ if (!test_bit_inv(pv_cmds_dump[i],
+ (unsigned long *)&uv_info.inst_calls_list)) {
+ r = 0;
+ break;
+ }
+ }
+ break;
+ }
+ case KVM_CAP_S390_ZPCI_OP:
+ r = kvm_s390_pci_interp_allowed();
+ break;
+ case KVM_CAP_S390_CPU_TOPOLOGY:
+ r = test_facility(11);
+ break;
default:
r = 0;
}
@@ -817,6 +856,20 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
icpt_operexc_on_all_vcpus(kvm);
r = 0;
break;
+ case KVM_CAP_S390_CPU_TOPOLOGY:
+ r = -EINVAL;
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ r = -EBUSY;
+ } else if (test_facility(11)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 11);
+ set_kvm_facility(kvm->arch.model.fac_list, 11);
+ r = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "ENABLE: CAP_S390_CPU_TOPOLOGY %s",
+ r ? "(not available)" : "(success)");
+ break;
default:
r = -EINVAL;
break;
@@ -1019,6 +1072,42 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
return 0;
}
+static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu)
+{
+ /* Only set the ECB bits after guest requests zPCI interpretation */
+ if (!vcpu->kvm->arch.use_zpci_interp)
+ return;
+
+ vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI;
+ vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI;
+}
+
+void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ unsigned long i;
+
+ lockdep_assert_held(&kvm->lock);
+
+ if (!kvm_s390_pci_interp_allowed())
+ return;
+
+ /*
+ * If host is configured for PCI and the necessary facilities are
+ * available, turn on interpretation for the life of this guest
+ */
+ kvm->arch.use_zpci_interp = 1;
+
+ kvm_s390_vcpu_block_all(kvm);
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ kvm_s390_vcpu_pci_setup(vcpu);
+ kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
+ }
+
+ kvm_s390_vcpu_unblock_all(kvm);
+}
+
static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
{
unsigned long cx;
@@ -1691,6 +1780,57 @@ static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
return ret;
}
+/**
+ * kvm_s390_update_topology_change_report - update CPU topology change report
+ * @kvm: guest KVM description
+ * @val: set or clear the MTCR bit
+ *
+ * Updates the Multiprocessor Topology-Change-Report bit to signal
+ * the guest with a topology change.
+ * This is only relevant if the topology facility is present.
+ *
+ * The SCA version, bsca or esca, doesn't matter as offset is the same.
+ */
+static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val)
+{
+ union sca_utility new, old;
+ struct bsca_block *sca;
+
+ read_lock(&kvm->arch.sca_lock);
+ sca = kvm->arch.sca;
+ do {
+ old = READ_ONCE(sca->utility);
+ new = old;
+ new.mtcr = val;
+ } while (cmpxchg(&sca->utility.val, old.val, new.val) != old.val);
+ read_unlock(&kvm->arch.sca_lock);
+}
+
+static int kvm_s390_set_topo_change_indication(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ if (!test_kvm_facility(kvm, 11))
+ return -ENXIO;
+
+ kvm_s390_update_topology_change_report(kvm, !!attr->attr);
+ return 0;
+}
+
+static int kvm_s390_get_topo_change_indication(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ u8 topo;
+
+ if (!test_kvm_facility(kvm, 11))
+ return -ENXIO;
+
+ read_lock(&kvm->arch.sca_lock);
+ topo = ((struct bsca_block *)kvm->arch.sca)->utility.mtcr;
+ read_unlock(&kvm->arch.sca_lock);
+
+ return put_user(topo, (u8 __user *)attr->addr);
+}
+
static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
int ret;
@@ -1711,6 +1851,9 @@ static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_MIGRATION:
ret = kvm_s390_vm_set_migration(kvm, attr);
break;
+ case KVM_S390_VM_CPU_TOPOLOGY:
+ ret = kvm_s390_set_topo_change_indication(kvm, attr);
+ break;
default:
ret = -ENXIO;
break;
@@ -1736,6 +1879,9 @@ static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_MIGRATION:
ret = kvm_s390_vm_get_migration(kvm, attr);
break;
+ case KVM_S390_VM_CPU_TOPOLOGY:
+ ret = kvm_s390_get_topo_change_indication(kvm, attr);
+ break;
default:
ret = -ENXIO;
break;
@@ -1809,6 +1955,9 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_MIGRATION:
ret = 0;
break;
+ case KVM_S390_VM_CPU_TOPOLOGY:
+ ret = test_kvm_facility(kvm, 11) ? 0 : -ENXIO;
+ break;
default:
ret = -ENXIO;
break;
@@ -2166,12 +2315,25 @@ out:
return r;
}
-static int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp)
+/**
+ * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to
+ * non protected.
+ * @kvm: the VM whose protected vCPUs are to be converted
+ * @rc: return value for the RC field of the UVC (in case of error)
+ * @rrc: return value for the RRC field of the UVC (in case of error)
+ *
+ * Does not stop in case of error, tries to convert as many
+ * CPUs as possible. In case of error, the RC and RRC of the last error are
+ * returned.
+ *
+ * Return: 0 in case of success, otherwise -EIO
+ */
+int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
{
struct kvm_vcpu *vcpu;
- u16 rc, rrc;
- int ret = 0;
unsigned long i;
+ u16 _rc, _rrc;
+ int ret = 0;
/*
* We ignore failures and try to destroy as many CPUs as possible.
@@ -2183,9 +2345,9 @@ static int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp)
*/
kvm_for_each_vcpu(i, vcpu, kvm) {
mutex_lock(&vcpu->mutex);
- if (kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc) && !ret) {
- *rcp = rc;
- *rrcp = rrc;
+ if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) {
+ *rc = _rc;
+ *rrc = _rrc;
ret = -EIO;
}
mutex_unlock(&vcpu->mutex);
@@ -2196,6 +2358,17 @@ static int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp)
return ret;
}
+/**
+ * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM
+ * to protected.
+ * @kvm: the VM whose protected vCPUs are to be converted
+ * @rc: return value for the RC field of the UVC (in case of error)
+ * @rrc: return value for the RRC field of the UVC (in case of error)
+ *
+ * Tries to undo the conversion in case of error.
+ *
+ * Return: 0 in case of success, otherwise -EIO
+ */
static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
{
unsigned long i;
@@ -2220,6 +2393,115 @@ static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
return r;
}
+/*
+ * Here we provide user space with a direct interface to query UV
+ * related data like UV maxima and available features as well as
+ * feature specific data.
+ *
+ * To facilitate future extension of the data structures we'll try to
+ * write data up to the maximum requested length.
+ */
+static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info)
+{
+ ssize_t len_min;
+
+ switch (info->header.id) {
+ case KVM_PV_INFO_VM: {
+ len_min = sizeof(info->header) + sizeof(info->vm);
+
+ if (info->header.len_max < len_min)
+ return -EINVAL;
+
+ memcpy(info->vm.inst_calls_list,
+ uv_info.inst_calls_list,
+ sizeof(uv_info.inst_calls_list));
+
+ /* It's max cpuid not max cpus, so it's off by one */
+ info->vm.max_cpus = uv_info.max_guest_cpu_id + 1;
+ info->vm.max_guests = uv_info.max_num_sec_conf;
+ info->vm.max_guest_addr = uv_info.max_sec_stor_addr;
+ info->vm.feature_indication = uv_info.uv_feature_indications;
+
+ return len_min;
+ }
+ case KVM_PV_INFO_DUMP: {
+ len_min = sizeof(info->header) + sizeof(info->dump);
+
+ if (info->header.len_max < len_min)
+ return -EINVAL;
+
+ info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len;
+ info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len;
+ info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len;
+ return len_min;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd,
+ struct kvm_s390_pv_dmp dmp)
+{
+ int r = -EINVAL;
+ void __user *result_buff = (void __user *)dmp.buff_addr;
+
+ switch (dmp.subcmd) {
+ case KVM_PV_DUMP_INIT: {
+ if (kvm->arch.pv.dumping)
+ break;
+
+ /*
+ * Block SIE entry as concurrent dump UVCs could lead
+ * to validities.
+ */
+ kvm_s390_vcpu_block_all(kvm);
+
+ r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
+ UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc);
+ KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x",
+ cmd->rc, cmd->rrc);
+ if (!r) {
+ kvm->arch.pv.dumping = true;
+ } else {
+ kvm_s390_vcpu_unblock_all(kvm);
+ r = -EINVAL;
+ }
+ break;
+ }
+ case KVM_PV_DUMP_CONFIG_STOR_STATE: {
+ if (!kvm->arch.pv.dumping)
+ break;
+
+ /*
+ * gaddr is an output parameter since we might stop
+ * early. As dmp will be copied back in our caller, we
+ * don't need to do it ourselves.
+ */
+ r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len,
+ &cmd->rc, &cmd->rrc);
+ break;
+ }
+ case KVM_PV_DUMP_COMPLETE: {
+ if (!kvm->arch.pv.dumping)
+ break;
+
+ r = -EINVAL;
+ if (dmp.buff_len < uv_info.conf_dump_finalize_len)
+ break;
+
+ r = kvm_s390_pv_dump_complete(kvm, result_buff,
+ &cmd->rc, &cmd->rrc);
+ break;
+ }
+ default:
+ r = -ENOTTY;
+ break;
+ }
+
+ return r;
+}
+
static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
{
int r = 0;
@@ -2356,6 +2638,68 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
cmd->rc, cmd->rrc);
break;
}
+ case KVM_PV_INFO: {
+ struct kvm_s390_pv_info info = {};
+ ssize_t data_len;
+
+ /*
+ * No need to check the VM protection here.
+ *
+ * Maybe user space wants to query some of the data
+ * when the VM is still unprotected. If we see the
+ * need to fence a new data command we can still
+ * return an error in the info handler.
+ */
+
+ r = -EFAULT;
+ if (copy_from_user(&info, argp, sizeof(info.header)))
+ break;
+
+ r = -EINVAL;
+ if (info.header.len_max < sizeof(info.header))
+ break;
+
+ data_len = kvm_s390_handle_pv_info(&info);
+ if (data_len < 0) {
+ r = data_len;
+ break;
+ }
+ /*
+ * If a data command struct is extended (multiple
+ * times) this can be used to determine how much of it
+ * is valid.
+ */
+ info.header.len_written = data_len;
+
+ r = -EFAULT;
+ if (copy_to_user(argp, &info, data_len))
+ break;
+
+ r = 0;
+ break;
+ }
+ case KVM_PV_DUMP: {
+ struct kvm_s390_pv_dmp dmp;
+
+ r = -EINVAL;
+ if (!kvm_s390_pv_is_protected(kvm))
+ break;
+
+ r = -EFAULT;
+ if (copy_from_user(&dmp, argp, sizeof(dmp)))
+ break;
+
+ r = kvm_s390_pv_dmp(kvm, cmd, dmp);
+ if (r)
+ break;
+
+ if (copy_to_user(argp, &dmp, sizeof(dmp))) {
+ r = -EFAULT;
+ break;
+ }
+
+ break;
+ }
default:
r = -ENOTTY;
}
@@ -2581,6 +2925,19 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = -EFAULT;
break;
}
+ case KVM_S390_ZPCI_OP: {
+ struct kvm_s390_zpci_op args;
+
+ r = -EINVAL;
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
+ break;
+ if (copy_from_user(&args, argp, sizeof(args))) {
+ r = -EFAULT;
+ break;
+ }
+ r = kvm_s390_pci_zpci_op(kvm, &args);
+ break;
+ }
default:
r = -ENOTTY;
}
@@ -2742,6 +3099,14 @@ static void sca_dispose(struct kvm *kvm)
kvm->arch.sca = NULL;
}
+void kvm_arch_free_vm(struct kvm *kvm)
+{
+ if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
+ kvm_s390_pci_clear_list(kvm);
+
+ __kvm_arch_free_vm(kvm);
+}
+
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
gfp_t alloc_flags = GFP_KERNEL_ACCOUNT;
@@ -2824,6 +3189,13 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm_s390_crypto_init(kvm);
+ if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
+ mutex_lock(&kvm->lock);
+ kvm_s390_pci_init_list(kvm);
+ kvm_s390_vcpu_pci_enable_interp(kvm);
+ mutex_unlock(&kvm->lock);
+ }
+
mutex_init(&kvm->arch.float_int.ais_lock);
spin_lock_init(&kvm->arch.float_int.lock);
for (i = 0; i < FIRQ_LIST_COUNT; i++)
@@ -2877,6 +3249,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
kvm_clear_async_pf_completion_queue(vcpu);
if (!kvm_is_ucontrol(vcpu->kvm))
sca_del_vcpu(vcpu);
+ kvm_s390_update_topology_change_report(vcpu->kvm, 1);
if (kvm_is_ucontrol(vcpu->kvm))
gmap_remove(vcpu->arch.gmap);
@@ -2904,6 +3277,15 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
*/
if (kvm_s390_pv_get_handle(kvm))
kvm_s390_pv_deinit_vm(kvm, &rc, &rrc);
+ /*
+ * Remove the mmu notifier only when the whole KVM VM is torn down,
+ * and only if one was registered to begin with. If the VM is
+ * currently not protected, but has been previously been protected,
+ * then it's possible that the notifier is still registered.
+ */
+ if (kvm->arch.pv.mmu_notifier.ops)
+ mmu_notifier_unregister(&kvm->arch.pv.mmu_notifier, kvm->mm);
+
debug_unregister(kvm->arch.dbf);
free_page((unsigned long)kvm->arch.sie_page2);
if (!kvm_is_ucontrol(kvm))
@@ -3047,9 +3429,7 @@ static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
if (!sclp.has_esca || !sclp.has_64bscao)
return false;
- mutex_lock(&kvm->lock);
rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
- mutex_unlock(&kvm->lock);
return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
}
@@ -3272,6 +3652,8 @@ static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
if (test_kvm_facility(vcpu->kvm, 9))
vcpu->arch.sie_block->ecb |= ECB_SRSI;
+ if (test_kvm_facility(vcpu->kvm, 11))
+ vcpu->arch.sie_block->ecb |= ECB_PTF;
if (test_kvm_facility(vcpu->kvm, 73))
vcpu->arch.sie_block->ecb |= ECB_TE;
if (!kvm_is_ucontrol(vcpu->kvm))
@@ -3324,6 +3706,8 @@ static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
kvm_s390_vcpu_crypto_setup(vcpu);
+ kvm_s390_vcpu_pci_setup(vcpu);
+
mutex_lock(&vcpu->kvm->lock);
if (kvm_s390_pv_is_protected(vcpu->kvm)) {
rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc);
@@ -3403,6 +3787,8 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
rc = kvm_s390_vcpu_setup(vcpu);
if (rc)
goto out_ucontrol_uninit;
+
+ kvm_s390_update_topology_change_report(vcpu->kvm, 1);
return 0;
out_ucontrol_uninit:
@@ -4473,6 +4859,15 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
struct kvm_run *kvm_run = vcpu->run;
int rc;
+ /*
+ * Running a VM while dumping always has the potential to
+ * produce inconsistent dump data. But for PV vcpus a SIE
+ * entry while dumping could also lead to a fatal validity
+ * intercept which we absolutely want to avoid.
+ */
+ if (vcpu->kvm->arch.pv.dumping)
+ return -EINVAL;
+
if (kvm_run->immediate_exit)
return -EINTR;
@@ -4912,6 +5307,48 @@ long kvm_arch_vcpu_async_ioctl(struct file *filp,
return -ENOIOCTLCMD;
}
+static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu,
+ struct kvm_pv_cmd *cmd)
+{
+ struct kvm_s390_pv_dmp dmp;
+ void *data;
+ int ret;
+
+ /* Dump initialization is a prerequisite */
+ if (!vcpu->kvm->arch.pv.dumping)
+ return -EINVAL;
+
+ if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp)))
+ return -EFAULT;
+
+ /* We only handle this subcmd right now */
+ if (dmp.subcmd != KVM_PV_DUMP_CPU)
+ return -EINVAL;
+
+ /* CPU dump length is the same as create cpu storage donation. */
+ if (dmp.buff_len != uv_info.guest_cpu_stor_len)
+ return -EINVAL;
+
+ data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc);
+
+ VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x",
+ vcpu->vcpu_id, cmd->rc, cmd->rrc);
+
+ if (ret)
+ ret = -EINVAL;
+
+ /* On success copy over the dump data */
+ if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len))
+ ret = -EFAULT;
+
+ kvfree(data);
+ return ret;
+}
+
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -5076,6 +5513,33 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
irq_state.len);
break;
}
+ case KVM_S390_PV_CPU_COMMAND: {
+ struct kvm_pv_cmd cmd;
+
+ r = -EINVAL;
+ if (!is_prot_virt_host())
+ break;
+
+ r = -EFAULT;
+ if (copy_from_user(&cmd, argp, sizeof(cmd)))
+ break;
+
+ r = -EINVAL;
+ if (cmd.flags)
+ break;
+
+ /* We only handle this cmd right now */
+ if (cmd.cmd != KVM_PV_DUMP)
+ break;
+
+ r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd);
+
+ /* Always copy over UV rc / rrc data */
+ if (copy_to_user((__u8 __user *)argp, &cmd.rc,
+ sizeof(cmd.rc) + sizeof(cmd.rrc)))
+ r = -EFAULT;
+ break;
+ }
default:
r = -ENOTTY;
}
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 497d52a83c78..f6fd668f887e 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -250,6 +250,11 @@ int kvm_s390_pv_set_sec_parms(struct kvm *kvm, void *hdr, u64 length, u16 *rc,
int kvm_s390_pv_unpack(struct kvm *kvm, unsigned long addr, unsigned long size,
unsigned long tweak, u16 *rc, u16 *rrc);
int kvm_s390_pv_set_cpu_state(struct kvm_vcpu *vcpu, u8 state);
+int kvm_s390_pv_dump_cpu(struct kvm_vcpu *vcpu, void *buff, u16 *rc, u16 *rrc);
+int kvm_s390_pv_dump_stor_state(struct kvm *kvm, void __user *buff_user,
+ u64 *gaddr, u64 buff_user_len, u16 *rc, u16 *rrc);
+int kvm_s390_pv_dump_complete(struct kvm *kvm, void __user *buff_user,
+ u16 *rc, u16 *rrc);
static inline u64 kvm_s390_pv_get_handle(struct kvm *kvm)
{
@@ -374,6 +379,7 @@ int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
+int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc);
/* implemented in diag.c */
int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
@@ -508,6 +514,16 @@ void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm);
/**
+ * kvm_s390_vcpu_pci_enable_interp
+ *
+ * Set the associated PCI attributes for each vcpu to allow for zPCI Load/Store
+ * interpretation as well as adapter interruption forwarding.
+ *
+ * @kvm: the KVM guest
+ */
+void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm);
+
+/**
* diag9c_forwarding_hz
*
* Set the maximum number of diag9c forwarding per second
diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
new file mode 100644
index 000000000000..4946fb7757d6
--- /dev/null
+++ b/arch/s390/kvm/pci.c
@@ -0,0 +1,690 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * s390 kvm PCI passthrough support
+ *
+ * Copyright IBM Corp. 2022
+ *
+ * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/pci.h>
+#include <asm/pci.h>
+#include <asm/pci_insn.h>
+#include <asm/pci_io.h>
+#include <asm/sclp.h>
+#include "pci.h"
+#include "kvm-s390.h"
+
+struct zpci_aift *aift;
+
+static inline int __set_irq_noiib(u16 ctl, u8 isc)
+{
+ union zpci_sic_iib iib = {{0}};
+
+ return zpci_set_irq_ctrl(ctl, isc, &iib);
+}
+
+void kvm_s390_pci_aen_exit(void)
+{
+ unsigned long flags;
+ struct kvm_zdev **gait_kzdev;
+
+ lockdep_assert_held(&aift->aift_lock);
+
+ /*
+ * Contents of the aipb remain registered for the life of the host
+ * kernel, the information preserved in zpci_aipb and zpci_aif_sbv
+ * in case we insert the KVM module again later. Clear the AIFT
+ * information and free anything not registered with underlying
+ * firmware.
+ */
+ spin_lock_irqsave(&aift->gait_lock, flags);
+ gait_kzdev = aift->kzdev;
+ aift->gait = NULL;
+ aift->sbv = NULL;
+ aift->kzdev = NULL;
+ spin_unlock_irqrestore(&aift->gait_lock, flags);
+
+ kfree(gait_kzdev);
+}
+
+static int zpci_setup_aipb(u8 nisc)
+{
+ struct page *page;
+ int size, rc;
+
+ zpci_aipb = kzalloc(sizeof(union zpci_sic_iib), GFP_KERNEL);
+ if (!zpci_aipb)
+ return -ENOMEM;
+
+ aift->sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC, 0);
+ if (!aift->sbv) {
+ rc = -ENOMEM;
+ goto free_aipb;
+ }
+ zpci_aif_sbv = aift->sbv;
+ size = get_order(PAGE_ALIGN(ZPCI_NR_DEVICES *
+ sizeof(struct zpci_gaite)));
+ page = alloc_pages(GFP_KERNEL | __GFP_ZERO, size);
+ if (!page) {
+ rc = -ENOMEM;
+ goto free_sbv;
+ }
+ aift->gait = (struct zpci_gaite *)page_to_phys(page);
+
+ zpci_aipb->aipb.faisb = virt_to_phys(aift->sbv->vector);
+ zpci_aipb->aipb.gait = virt_to_phys(aift->gait);
+ zpci_aipb->aipb.afi = nisc;
+ zpci_aipb->aipb.faal = ZPCI_NR_DEVICES;
+
+ /* Setup Adapter Event Notification Interpretation */
+ if (zpci_set_irq_ctrl(SIC_SET_AENI_CONTROLS, 0, zpci_aipb)) {
+ rc = -EIO;
+ goto free_gait;
+ }
+
+ return 0;
+
+free_gait:
+ free_pages((unsigned long)aift->gait, size);
+free_sbv:
+ airq_iv_release(aift->sbv);
+ zpci_aif_sbv = NULL;
+free_aipb:
+ kfree(zpci_aipb);
+ zpci_aipb = NULL;
+
+ return rc;
+}
+
+static int zpci_reset_aipb(u8 nisc)
+{
+ /*
+ * AEN registration can only happen once per system boot. If
+ * an aipb already exists then AEN was already registered and
+ * we can re-use the aipb contents. This can only happen if
+ * the KVM module was removed and re-inserted. However, we must
+ * ensure that the same forwarding ISC is used as this is assigned
+ * during KVM module load.
+ */
+ if (zpci_aipb->aipb.afi != nisc)
+ return -EINVAL;
+
+ aift->sbv = zpci_aif_sbv;
+ aift->gait = (struct zpci_gaite *)zpci_aipb->aipb.gait;
+
+ return 0;
+}
+
+int kvm_s390_pci_aen_init(u8 nisc)
+{
+ int rc = 0;
+
+ /* If already enabled for AEN, bail out now */
+ if (aift->gait || aift->sbv)
+ return -EPERM;
+
+ mutex_lock(&aift->aift_lock);
+ aift->kzdev = kcalloc(ZPCI_NR_DEVICES, sizeof(struct kvm_zdev),
+ GFP_KERNEL);
+ if (!aift->kzdev) {
+ rc = -ENOMEM;
+ goto unlock;
+ }
+
+ if (!zpci_aipb)
+ rc = zpci_setup_aipb(nisc);
+ else
+ rc = zpci_reset_aipb(nisc);
+ if (rc)
+ goto free_zdev;
+
+ /* Enable floating IRQs */
+ if (__set_irq_noiib(SIC_IRQ_MODE_SINGLE, nisc)) {
+ rc = -EIO;
+ kvm_s390_pci_aen_exit();
+ }
+
+ goto unlock;
+
+free_zdev:
+ kfree(aift->kzdev);
+unlock:
+ mutex_unlock(&aift->aift_lock);
+ return rc;
+}
+
+/* Modify PCI: Register floating adapter interruption forwarding */
+static int kvm_zpci_set_airq(struct zpci_dev *zdev)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
+ struct zpci_fib fib = {};
+ u8 status;
+
+ fib.fmt0.isc = zdev->kzdev->fib.fmt0.isc;
+ fib.fmt0.sum = 1; /* enable summary notifications */
+ fib.fmt0.noi = airq_iv_end(zdev->aibv);
+ fib.fmt0.aibv = virt_to_phys(zdev->aibv->vector);
+ fib.fmt0.aibvo = 0;
+ fib.fmt0.aisb = virt_to_phys(aift->sbv->vector + (zdev->aisb / 64) * 8);
+ fib.fmt0.aisbo = zdev->aisb & 63;
+ fib.gd = zdev->gisa;
+
+ return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
+}
+
+/* Modify PCI: Unregister floating adapter interruption forwarding */
+static int kvm_zpci_clear_airq(struct zpci_dev *zdev)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
+ struct zpci_fib fib = {};
+ u8 cc, status;
+
+ fib.gd = zdev->gisa;
+
+ cc = zpci_mod_fc(req, &fib, &status);
+ if (cc == 3 || (cc == 1 && status == 24))
+ /* Function already gone or IRQs already deregistered. */
+ cc = 0;
+
+ return cc ? -EIO : 0;
+}
+
+static inline void unaccount_mem(unsigned long nr_pages)
+{
+ struct user_struct *user = get_uid(current_user());
+
+ if (user)
+ atomic_long_sub(nr_pages, &user->locked_vm);
+ if (current->mm)
+ atomic64_sub(nr_pages, &current->mm->pinned_vm);
+}
+
+static inline int account_mem(unsigned long nr_pages)
+{
+ struct user_struct *user = get_uid(current_user());
+ unsigned long page_limit, cur_pages, new_pages;
+
+ page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+
+ do {
+ cur_pages = atomic_long_read(&user->locked_vm);
+ new_pages = cur_pages + nr_pages;
+ if (new_pages > page_limit)
+ return -ENOMEM;
+ } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages,
+ new_pages) != cur_pages);
+
+ atomic64_add(nr_pages, &current->mm->pinned_vm);
+
+ return 0;
+}
+
+static int kvm_s390_pci_aif_enable(struct zpci_dev *zdev, struct zpci_fib *fib,
+ bool assist)
+{
+ struct page *pages[1], *aibv_page, *aisb_page = NULL;
+ unsigned int msi_vecs, idx;
+ struct zpci_gaite *gaite;
+ unsigned long hva, bit;
+ struct kvm *kvm;
+ phys_addr_t gaddr;
+ int rc = 0, gisc, npages, pcount = 0;
+
+ /*
+ * Interrupt forwarding is only applicable if the device is already
+ * enabled for interpretation
+ */
+ if (zdev->gisa == 0)
+ return -EINVAL;
+
+ kvm = zdev->kzdev->kvm;
+ msi_vecs = min_t(unsigned int, fib->fmt0.noi, zdev->max_msi);
+
+ /* Get the associated forwarding ISC - if invalid, return the error */
+ gisc = kvm_s390_gisc_register(kvm, fib->fmt0.isc);
+ if (gisc < 0)
+ return gisc;
+
+ /* Replace AIBV address */
+ idx = srcu_read_lock(&kvm->srcu);
+ hva = gfn_to_hva(kvm, gpa_to_gfn((gpa_t)fib->fmt0.aibv));
+ npages = pin_user_pages_fast(hva, 1, FOLL_WRITE | FOLL_LONGTERM, pages);
+ srcu_read_unlock(&kvm->srcu, idx);
+ if (npages < 1) {
+ rc = -EIO;
+ goto out;
+ }
+ aibv_page = pages[0];
+ pcount++;
+ gaddr = page_to_phys(aibv_page) + (fib->fmt0.aibv & ~PAGE_MASK);
+ fib->fmt0.aibv = gaddr;
+
+ /* Pin the guest AISB if one was specified */
+ if (fib->fmt0.sum == 1) {
+ idx = srcu_read_lock(&kvm->srcu);
+ hva = gfn_to_hva(kvm, gpa_to_gfn((gpa_t)fib->fmt0.aisb));
+ npages = pin_user_pages_fast(hva, 1, FOLL_WRITE | FOLL_LONGTERM,
+ pages);
+ srcu_read_unlock(&kvm->srcu, idx);
+ if (npages < 1) {
+ rc = -EIO;
+ goto unpin1;
+ }
+ aisb_page = pages[0];
+ pcount++;
+ }
+
+ /* Account for pinned pages, roll back on failure */
+ if (account_mem(pcount))
+ goto unpin2;
+
+ /* AISB must be allocated before we can fill in GAITE */
+ mutex_lock(&aift->aift_lock);
+ bit = airq_iv_alloc_bit(aift->sbv);
+ if (bit == -1UL)
+ goto unlock;
+ zdev->aisb = bit; /* store the summary bit number */
+ zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA |
+ AIRQ_IV_BITLOCK |
+ AIRQ_IV_GUESTVEC,
+ phys_to_virt(fib->fmt0.aibv));
+
+ spin_lock_irq(&aift->gait_lock);
+ gaite = (struct zpci_gaite *)aift->gait + (zdev->aisb *
+ sizeof(struct zpci_gaite));
+
+ /* If assist not requested, host will get all alerts */
+ if (assist)
+ gaite->gisa = (u32)virt_to_phys(&kvm->arch.sie_page2->gisa);
+ else
+ gaite->gisa = 0;
+
+ gaite->gisc = fib->fmt0.isc;
+ gaite->count++;
+ gaite->aisbo = fib->fmt0.aisbo;
+ gaite->aisb = virt_to_phys(page_address(aisb_page) + (fib->fmt0.aisb &
+ ~PAGE_MASK));
+ aift->kzdev[zdev->aisb] = zdev->kzdev;
+ spin_unlock_irq(&aift->gait_lock);
+
+ /* Update guest FIB for re-issue */
+ fib->fmt0.aisbo = zdev->aisb & 63;
+ fib->fmt0.aisb = virt_to_phys(aift->sbv->vector + (zdev->aisb / 64) * 8);
+ fib->fmt0.isc = gisc;
+
+ /* Save some guest fib values in the host for later use */
+ zdev->kzdev->fib.fmt0.isc = fib->fmt0.isc;
+ zdev->kzdev->fib.fmt0.aibv = fib->fmt0.aibv;
+ mutex_unlock(&aift->aift_lock);
+
+ /* Issue the clp to setup the irq now */
+ rc = kvm_zpci_set_airq(zdev);
+ return rc;
+
+unlock:
+ mutex_unlock(&aift->aift_lock);
+unpin2:
+ if (fib->fmt0.sum == 1)
+ unpin_user_page(aisb_page);
+unpin1:
+ unpin_user_page(aibv_page);
+out:
+ return rc;
+}
+
+static int kvm_s390_pci_aif_disable(struct zpci_dev *zdev, bool force)
+{
+ struct kvm_zdev *kzdev = zdev->kzdev;
+ struct zpci_gaite *gaite;
+ struct page *vpage = NULL, *spage = NULL;
+ int rc, pcount = 0;
+ u8 isc;
+
+ if (zdev->gisa == 0)
+ return -EINVAL;
+
+ mutex_lock(&aift->aift_lock);
+
+ /*
+ * If the clear fails due to an error, leave now unless we know this
+ * device is about to go away (force) -- In that case clear the GAITE
+ * regardless.
+ */
+ rc = kvm_zpci_clear_airq(zdev);
+ if (rc && !force)
+ goto out;
+
+ if (zdev->kzdev->fib.fmt0.aibv == 0)
+ goto out;
+ spin_lock_irq(&aift->gait_lock);
+ gaite = (struct zpci_gaite *)aift->gait + (zdev->aisb *
+ sizeof(struct zpci_gaite));
+ isc = gaite->gisc;
+ gaite->count--;
+ if (gaite->count == 0) {
+ /* Release guest AIBV and AISB */
+ vpage = phys_to_page(kzdev->fib.fmt0.aibv);
+ if (gaite->aisb != 0)
+ spage = phys_to_page(gaite->aisb);
+ /* Clear the GAIT entry */
+ gaite->aisb = 0;
+ gaite->gisc = 0;
+ gaite->aisbo = 0;
+ gaite->gisa = 0;
+ aift->kzdev[zdev->aisb] = 0;
+ /* Clear zdev info */
+ airq_iv_free_bit(aift->sbv, zdev->aisb);
+ airq_iv_release(zdev->aibv);
+ zdev->aisb = 0;
+ zdev->aibv = NULL;
+ }
+ spin_unlock_irq(&aift->gait_lock);
+ kvm_s390_gisc_unregister(kzdev->kvm, isc);
+ kzdev->fib.fmt0.isc = 0;
+ kzdev->fib.fmt0.aibv = 0;
+
+ if (vpage) {
+ unpin_user_page(vpage);
+ pcount++;
+ }
+ if (spage) {
+ unpin_user_page(spage);
+ pcount++;
+ }
+ if (pcount > 0)
+ unaccount_mem(pcount);
+out:
+ mutex_unlock(&aift->aift_lock);
+
+ return rc;
+}
+
+static int kvm_s390_pci_dev_open(struct zpci_dev *zdev)
+{
+ struct kvm_zdev *kzdev;
+
+ kzdev = kzalloc(sizeof(struct kvm_zdev), GFP_KERNEL);
+ if (!kzdev)
+ return -ENOMEM;
+
+ kzdev->zdev = zdev;
+ zdev->kzdev = kzdev;
+
+ return 0;
+}
+
+static void kvm_s390_pci_dev_release(struct zpci_dev *zdev)
+{
+ struct kvm_zdev *kzdev;
+
+ kzdev = zdev->kzdev;
+ WARN_ON(kzdev->zdev != zdev);
+ zdev->kzdev = NULL;
+ kfree(kzdev);
+}
+
+
+/*
+ * Register device with the specified KVM. If interpetation facilities are
+ * available, enable them and let userspace indicate whether or not they will
+ * be used (specify SHM bit to disable).
+ */
+int kvm_s390_pci_register_kvm(struct zpci_dev *zdev, struct kvm *kvm)
+{
+ int rc;
+
+ if (!zdev)
+ return -EINVAL;
+
+ mutex_lock(&zdev->kzdev_lock);
+
+ if (zdev->kzdev || zdev->gisa != 0 || !kvm) {
+ mutex_unlock(&zdev->kzdev_lock);
+ return -EINVAL;
+ }
+
+ kvm_get_kvm(kvm);
+
+ mutex_lock(&kvm->lock);
+
+ rc = kvm_s390_pci_dev_open(zdev);
+ if (rc)
+ goto err;
+
+ /*
+ * If interpretation facilities aren't available, add the device to
+ * the kzdev list but don't enable for interpretation.
+ */
+ if (!kvm_s390_pci_interp_allowed())
+ goto out;
+
+ /*
+ * If this is the first request to use an interpreted device, make the
+ * necessary vcpu changes
+ */
+ if (!kvm->arch.use_zpci_interp)
+ kvm_s390_vcpu_pci_enable_interp(kvm);
+
+ if (zdev_enabled(zdev)) {
+ rc = zpci_disable_device(zdev);
+ if (rc)
+ goto err;
+ }
+
+ /*
+ * Store information about the identity of the kvm guest allowed to
+ * access this device via interpretation to be used by host CLP
+ */
+ zdev->gisa = (u32)virt_to_phys(&kvm->arch.sie_page2->gisa);
+
+ rc = zpci_enable_device(zdev);
+ if (rc)
+ goto clear_gisa;
+
+ /* Re-register the IOMMU that was already created */
+ rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
+ virt_to_phys(zdev->dma_table));
+ if (rc)
+ goto clear_gisa;
+
+out:
+ zdev->kzdev->kvm = kvm;
+
+ spin_lock(&kvm->arch.kzdev_list_lock);
+ list_add_tail(&zdev->kzdev->entry, &kvm->arch.kzdev_list);
+ spin_unlock(&kvm->arch.kzdev_list_lock);
+
+ mutex_unlock(&kvm->lock);
+ mutex_unlock(&zdev->kzdev_lock);
+ return 0;
+
+clear_gisa:
+ zdev->gisa = 0;
+err:
+ if (zdev->kzdev)
+ kvm_s390_pci_dev_release(zdev);
+ mutex_unlock(&kvm->lock);
+ mutex_unlock(&zdev->kzdev_lock);
+ kvm_put_kvm(kvm);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(kvm_s390_pci_register_kvm);
+
+void kvm_s390_pci_unregister_kvm(struct zpci_dev *zdev)
+{
+ struct kvm *kvm;
+
+ if (!zdev)
+ return;
+
+ mutex_lock(&zdev->kzdev_lock);
+
+ if (WARN_ON(!zdev->kzdev)) {
+ mutex_unlock(&zdev->kzdev_lock);
+ return;
+ }
+
+ kvm = zdev->kzdev->kvm;
+ mutex_lock(&kvm->lock);
+
+ /*
+ * A 0 gisa means interpretation was never enabled, just remove the
+ * device from the list.
+ */
+ if (zdev->gisa == 0)
+ goto out;
+
+ /* Forwarding must be turned off before interpretation */
+ if (zdev->kzdev->fib.fmt0.aibv != 0)
+ kvm_s390_pci_aif_disable(zdev, true);
+
+ /* Remove the host CLP guest designation */
+ zdev->gisa = 0;
+
+ if (zdev_enabled(zdev)) {
+ if (zpci_disable_device(zdev))
+ goto out;
+ }
+
+ if (zpci_enable_device(zdev))
+ goto out;
+
+ /* Re-register the IOMMU that was already created */
+ zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
+ virt_to_phys(zdev->dma_table));
+
+out:
+ spin_lock(&kvm->arch.kzdev_list_lock);
+ list_del(&zdev->kzdev->entry);
+ spin_unlock(&kvm->arch.kzdev_list_lock);
+ kvm_s390_pci_dev_release(zdev);
+
+ mutex_unlock(&kvm->lock);
+ mutex_unlock(&zdev->kzdev_lock);
+
+ kvm_put_kvm(kvm);
+}
+EXPORT_SYMBOL_GPL(kvm_s390_pci_unregister_kvm);
+
+void kvm_s390_pci_init_list(struct kvm *kvm)
+{
+ spin_lock_init(&kvm->arch.kzdev_list_lock);
+ INIT_LIST_HEAD(&kvm->arch.kzdev_list);
+}
+
+void kvm_s390_pci_clear_list(struct kvm *kvm)
+{
+ /*
+ * This list should already be empty, either via vfio device closures
+ * or kvm fd cleanup.
+ */
+ spin_lock(&kvm->arch.kzdev_list_lock);
+ WARN_ON_ONCE(!list_empty(&kvm->arch.kzdev_list));
+ spin_unlock(&kvm->arch.kzdev_list_lock);
+}
+
+static struct zpci_dev *get_zdev_from_kvm_by_fh(struct kvm *kvm, u32 fh)
+{
+ struct zpci_dev *zdev = NULL;
+ struct kvm_zdev *kzdev;
+
+ spin_lock(&kvm->arch.kzdev_list_lock);
+ list_for_each_entry(kzdev, &kvm->arch.kzdev_list, entry) {
+ if (kzdev->zdev->fh == fh) {
+ zdev = kzdev->zdev;
+ break;
+ }
+ }
+ spin_unlock(&kvm->arch.kzdev_list_lock);
+
+ return zdev;
+}
+
+static int kvm_s390_pci_zpci_reg_aen(struct zpci_dev *zdev,
+ struct kvm_s390_zpci_op *args)
+{
+ struct zpci_fib fib = {};
+ bool hostflag;
+
+ fib.fmt0.aibv = args->u.reg_aen.ibv;
+ fib.fmt0.isc = args->u.reg_aen.isc;
+ fib.fmt0.noi = args->u.reg_aen.noi;
+ if (args->u.reg_aen.sb != 0) {
+ fib.fmt0.aisb = args->u.reg_aen.sb;
+ fib.fmt0.aisbo = args->u.reg_aen.sbo;
+ fib.fmt0.sum = 1;
+ } else {
+ fib.fmt0.aisb = 0;
+ fib.fmt0.aisbo = 0;
+ fib.fmt0.sum = 0;
+ }
+
+ hostflag = !(args->u.reg_aen.flags & KVM_S390_ZPCIOP_REGAEN_HOST);
+ return kvm_s390_pci_aif_enable(zdev, &fib, hostflag);
+}
+
+int kvm_s390_pci_zpci_op(struct kvm *kvm, struct kvm_s390_zpci_op *args)
+{
+ struct kvm_zdev *kzdev;
+ struct zpci_dev *zdev;
+ int r;
+
+ zdev = get_zdev_from_kvm_by_fh(kvm, args->fh);
+ if (!zdev)
+ return -ENODEV;
+
+ mutex_lock(&zdev->kzdev_lock);
+ mutex_lock(&kvm->lock);
+
+ kzdev = zdev->kzdev;
+ if (!kzdev) {
+ r = -ENODEV;
+ goto out;
+ }
+ if (kzdev->kvm != kvm) {
+ r = -EPERM;
+ goto out;
+ }
+
+ switch (args->op) {
+ case KVM_S390_ZPCIOP_REG_AEN:
+ /* Fail on unknown flags */
+ if (args->u.reg_aen.flags & ~KVM_S390_ZPCIOP_REGAEN_HOST) {
+ r = -EINVAL;
+ break;
+ }
+ r = kvm_s390_pci_zpci_reg_aen(zdev, args);
+ break;
+ case KVM_S390_ZPCIOP_DEREG_AEN:
+ r = kvm_s390_pci_aif_disable(zdev, false);
+ break;
+ default:
+ r = -EINVAL;
+ }
+
+out:
+ mutex_unlock(&kvm->lock);
+ mutex_unlock(&zdev->kzdev_lock);
+ return r;
+}
+
+int kvm_s390_pci_init(void)
+{
+ aift = kzalloc(sizeof(struct zpci_aift), GFP_KERNEL);
+ if (!aift)
+ return -ENOMEM;
+
+ spin_lock_init(&aift->gait_lock);
+ mutex_init(&aift->aift_lock);
+
+ return 0;
+}
+
+void kvm_s390_pci_exit(void)
+{
+ mutex_destroy(&aift->aift_lock);
+
+ kfree(aift);
+}
diff --git a/arch/s390/kvm/pci.h b/arch/s390/kvm/pci.h
new file mode 100644
index 000000000000..3a3606c3a0fe
--- /dev/null
+++ b/arch/s390/kvm/pci.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * s390 kvm PCI passthrough support
+ *
+ * Copyright IBM Corp. 2022
+ *
+ * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
+ */
+
+#ifndef __KVM_S390_PCI_H
+#define __KVM_S390_PCI_H
+
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <asm/airq.h>
+#include <asm/cpu.h>
+
+struct kvm_zdev {
+ struct zpci_dev *zdev;
+ struct kvm *kvm;
+ struct zpci_fib fib;
+ struct list_head entry;
+};
+
+struct zpci_gaite {
+ u32 gisa;
+ u8 gisc;
+ u8 count;
+ u8 reserved;
+ u8 aisbo;
+ u64 aisb;
+};
+
+struct zpci_aift {
+ struct zpci_gaite *gait;
+ struct airq_iv *sbv;
+ struct kvm_zdev **kzdev;
+ spinlock_t gait_lock; /* Protects the gait, used during AEN forward */
+ struct mutex aift_lock; /* Protects the other structures in aift */
+};
+
+extern struct zpci_aift *aift;
+
+static inline struct kvm *kvm_s390_pci_si_to_kvm(struct zpci_aift *aift,
+ unsigned long si)
+{
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || aift->kzdev == 0 ||
+ aift->kzdev[si] == 0)
+ return 0;
+ return aift->kzdev[si]->kvm;
+};
+
+int kvm_s390_pci_aen_init(u8 nisc);
+void kvm_s390_pci_aen_exit(void);
+
+void kvm_s390_pci_init_list(struct kvm *kvm);
+void kvm_s390_pci_clear_list(struct kvm *kvm);
+
+int kvm_s390_pci_zpci_op(struct kvm *kvm, struct kvm_s390_zpci_op *args);
+
+int kvm_s390_pci_init(void);
+void kvm_s390_pci_exit(void);
+
+static inline bool kvm_s390_pci_interp_allowed(void)
+{
+ struct cpuid cpu_id;
+
+ get_cpu_id(&cpu_id);
+ switch (cpu_id.machine) {
+ case 0x2817:
+ case 0x2818:
+ case 0x2827:
+ case 0x2828:
+ case 0x2964:
+ case 0x2965:
+ /* No SHM on certain machines */
+ return false;
+ default:
+ return (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) &&
+ sclp.has_zpci_lsi && sclp.has_aeni && sclp.has_aisi &&
+ sclp.has_aisii);
+ }
+}
+
+#endif /* __KVM_S390_PCI_H */
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 83bb5cf97282..3335fa09b6f1 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -442,7 +442,7 @@ static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
vcpu->stat.instruction_ipte_interlock++;
if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
- wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
+ wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
kvm_s390_retry_instr(vcpu);
VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
return 0;
@@ -873,10 +873,18 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
- if (fc > 3) {
- kvm_s390_set_psw_cc(vcpu, 3);
- return 0;
- }
+ /* Bailout forbidden function codes */
+ if (fc > 3 && fc != 15)
+ goto out_no_data;
+
+ /*
+ * fc 15 is provided only with
+ * - PTF/CPU topology support through facility 15
+ * - KVM_CAP_S390_USER_STSI
+ */
+ if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
+ !vcpu->kvm->arch.user_stsi))
+ goto out_no_data;
if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
|| vcpu->run->s.regs.gprs[1] & 0xffff0000)
@@ -910,6 +918,10 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
goto out_no_data;
handle_stsi_3_2_2(vcpu, (void *) mem);
break;
+ case 15: /* fc 15 is fully handled in userspace */
+ insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
+ trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
+ return -EREMOTE;
}
if (kvm_s390_pv_cpu_is_protected(vcpu)) {
memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem,
@@ -1471,7 +1483,7 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
access_key = (operand2 & 0xf0) >> 4;
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
- ipte_lock(vcpu);
+ ipte_lock(vcpu->kvm);
ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
GACC_STORE, access_key);
@@ -1508,7 +1520,7 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
}
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
- ipte_unlock(vcpu);
+ ipte_unlock(vcpu->kvm);
return ret;
}
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index cc7c9599f43e..7cb7799a0acb 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -7,13 +7,25 @@
*/
#include <linux/kvm.h>
#include <linux/kvm_host.h>
+#include <linux/minmax.h>
#include <linux/pagemap.h>
#include <linux/sched/signal.h>
#include <asm/gmap.h>
#include <asm/uv.h>
#include <asm/mman.h>
+#include <linux/pagewalk.h>
+#include <linux/sched/mm.h>
+#include <linux/mmu_notifier.h>
#include "kvm-s390.h"
+static void kvm_s390_clear_pv_state(struct kvm *kvm)
+{
+ kvm->arch.pv.handle = 0;
+ kvm->arch.pv.guest_len = 0;
+ kvm->arch.pv.stor_base = 0;
+ kvm->arch.pv.stor_var = NULL;
+}
+
int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)
{
int cc;
@@ -108,7 +120,7 @@ static void kvm_s390_pv_dealloc_vm(struct kvm *kvm)
vfree(kvm->arch.pv.stor_var);
free_pages(kvm->arch.pv.stor_base,
get_order(uv_info.guest_base_stor_len));
- memset(&kvm->arch.pv, 0, sizeof(kvm->arch.pv));
+ kvm_s390_clear_pv_state(kvm);
}
static int kvm_s390_pv_alloc_vm(struct kvm *kvm)
@@ -152,21 +164,51 @@ int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
{
int cc;
- /* make all pages accessible before destroying the guest */
- s390_reset_acc(kvm->mm);
-
cc = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
UVC_CMD_DESTROY_SEC_CONF, rc, rrc);
WRITE_ONCE(kvm->arch.gmap->guest_handle, 0);
- atomic_set(&kvm->mm->context.is_protected, 0);
+ /*
+ * if the mm still has a mapping, make all its pages accessible
+ * before destroying the guest
+ */
+ if (mmget_not_zero(kvm->mm)) {
+ s390_uv_destroy_range(kvm->mm, 0, TASK_SIZE);
+ mmput(kvm->mm);
+ }
+
+ if (!cc) {
+ atomic_dec(&kvm->mm->context.protected_count);
+ kvm_s390_pv_dealloc_vm(kvm);
+ } else {
+ /* Intended memory leak on "impossible" error */
+ s390_replace_asce(kvm->arch.gmap);
+ }
KVM_UV_EVENT(kvm, 3, "PROTVIRT DESTROY VM: rc %x rrc %x", *rc, *rrc);
WARN_ONCE(cc, "protvirt destroy vm failed rc %x rrc %x", *rc, *rrc);
- /* Inteded memory leak on "impossible" error */
- if (!cc)
- kvm_s390_pv_dealloc_vm(kvm);
+
return cc ? -EIO : 0;
}
+static void kvm_s390_pv_mmu_notifier_release(struct mmu_notifier *subscription,
+ struct mm_struct *mm)
+{
+ struct kvm *kvm = container_of(subscription, struct kvm, arch.pv.mmu_notifier);
+ u16 dummy;
+
+ /*
+ * No locking is needed since this is the last thread of the last user of this
+ * struct mm.
+ * When the struct kvm gets deinitialized, this notifier is also
+ * unregistered. This means that if this notifier runs, then the
+ * struct kvm is still valid.
+ */
+ kvm_s390_cpus_from_pv(kvm, &dummy, &dummy);
+}
+
+static const struct mmu_notifier_ops kvm_s390_pv_mmu_notifier_ops = {
+ .release = kvm_s390_pv_mmu_notifier_release,
+};
+
int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
{
struct uv_cb_cgc uvcb = {
@@ -197,14 +239,22 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
/* Outputs */
kvm->arch.pv.handle = uvcb.guest_handle;
+ atomic_inc(&kvm->mm->context.protected_count);
if (cc) {
- if (uvcb.header.rc & UVC_RC_NEED_DESTROY)
+ if (uvcb.header.rc & UVC_RC_NEED_DESTROY) {
kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);
- else
+ } else {
+ atomic_dec(&kvm->mm->context.protected_count);
kvm_s390_pv_dealloc_vm(kvm);
+ }
return -EIO;
}
kvm->arch.gmap->guest_handle = uvcb.guest_handle;
+ /* Add the notifier only once. No races because we hold kvm->lock */
+ if (kvm->arch.pv.mmu_notifier.ops != &kvm_s390_pv_mmu_notifier_ops) {
+ kvm->arch.pv.mmu_notifier.ops = &kvm_s390_pv_mmu_notifier_ops;
+ mmu_notifier_register(&kvm->arch.pv.mmu_notifier, kvm->mm);
+ }
return 0;
}
@@ -224,8 +274,6 @@ int kvm_s390_pv_set_sec_parms(struct kvm *kvm, void *hdr, u64 length, u16 *rc,
*rrc = uvcb.header.rrc;
KVM_UV_EVENT(kvm, 3, "PROTVIRT VM SET PARMS: rc %x rrc %x",
*rc, *rrc);
- if (!cc)
- atomic_set(&kvm->mm->context.is_protected, 1);
return cc ? -EINVAL : 0;
}
@@ -298,3 +346,200 @@ int kvm_s390_pv_set_cpu_state(struct kvm_vcpu *vcpu, u8 state)
return -EINVAL;
return 0;
}
+
+int kvm_s390_pv_dump_cpu(struct kvm_vcpu *vcpu, void *buff, u16 *rc, u16 *rrc)
+{
+ struct uv_cb_dump_cpu uvcb = {
+ .header.cmd = UVC_CMD_DUMP_CPU,
+ .header.len = sizeof(uvcb),
+ .cpu_handle = vcpu->arch.pv.handle,
+ .dump_area_origin = (u64)buff,
+ };
+ int cc;
+
+ cc = uv_call_sched(0, (u64)&uvcb);
+ *rc = uvcb.header.rc;
+ *rrc = uvcb.header.rrc;
+ return cc;
+}
+
+/* Size of the cache for the storage state dump data. 1MB for now */
+#define DUMP_BUFF_LEN HPAGE_SIZE
+
+/**
+ * kvm_s390_pv_dump_stor_state
+ *
+ * @kvm: pointer to the guest's KVM struct
+ * @buff_user: Userspace pointer where we will write the results to
+ * @gaddr: Starting absolute guest address for which the storage state
+ * is requested.
+ * @buff_user_len: Length of the buff_user buffer
+ * @rc: Pointer to where the uvcb return code is stored
+ * @rrc: Pointer to where the uvcb return reason code is stored
+ *
+ * Stores buff_len bytes of tweak component values to buff_user
+ * starting with the 1MB block specified by the absolute guest address
+ * (gaddr). The gaddr pointer will be updated with the last address
+ * for which data was written when returning to userspace. buff_user
+ * might be written to even if an error rc is returned. For instance
+ * if we encounter a fault after writing the first page of data.
+ *
+ * Context: kvm->lock needs to be held
+ *
+ * Return:
+ * 0 on success
+ * -ENOMEM if allocating the cache fails
+ * -EINVAL if gaddr is not aligned to 1MB
+ * -EINVAL if buff_user_len is not aligned to uv_info.conf_dump_storage_state_len
+ * -EINVAL if the UV call fails, rc and rrc will be set in this case
+ * -EFAULT if copying the result to buff_user failed
+ */
+int kvm_s390_pv_dump_stor_state(struct kvm *kvm, void __user *buff_user,
+ u64 *gaddr, u64 buff_user_len, u16 *rc, u16 *rrc)
+{
+ struct uv_cb_dump_stor_state uvcb = {
+ .header.cmd = UVC_CMD_DUMP_CONF_STOR_STATE,
+ .header.len = sizeof(uvcb),
+ .config_handle = kvm->arch.pv.handle,
+ .gaddr = *gaddr,
+ .dump_area_origin = 0,
+ };
+ const u64 increment_len = uv_info.conf_dump_storage_state_len;
+ size_t buff_kvm_size;
+ size_t size_done = 0;
+ u8 *buff_kvm = NULL;
+ int cc, ret;
+
+ ret = -EINVAL;
+ /* UV call processes 1MB guest storage chunks at a time */
+ if (!IS_ALIGNED(*gaddr, HPAGE_SIZE))
+ goto out;
+
+ /*
+ * We provide the storage state for 1MB chunks of guest
+ * storage. The buffer will need to be aligned to
+ * conf_dump_storage_state_len so we don't end on a partial
+ * chunk.
+ */
+ if (!buff_user_len ||
+ !IS_ALIGNED(buff_user_len, increment_len))
+ goto out;
+
+ /*
+ * Allocate a buffer from which we will later copy to the user
+ * process. We don't want userspace to dictate our buffer size
+ * so we limit it to DUMP_BUFF_LEN.
+ */
+ ret = -ENOMEM;
+ buff_kvm_size = min_t(u64, buff_user_len, DUMP_BUFF_LEN);
+ buff_kvm = vzalloc(buff_kvm_size);
+ if (!buff_kvm)
+ goto out;
+
+ ret = 0;
+ uvcb.dump_area_origin = (u64)buff_kvm;
+ /* We will loop until the user buffer is filled or an error occurs */
+ do {
+ /* Get 1MB worth of guest storage state data */
+ cc = uv_call_sched(0, (u64)&uvcb);
+
+ /* All or nothing */
+ if (cc) {
+ ret = -EINVAL;
+ break;
+ }
+
+ size_done += increment_len;
+ uvcb.dump_area_origin += increment_len;
+ buff_user_len -= increment_len;
+ uvcb.gaddr += HPAGE_SIZE;
+
+ /* KVM Buffer full, time to copy to the process */
+ if (!buff_user_len || size_done == DUMP_BUFF_LEN) {
+ if (copy_to_user(buff_user, buff_kvm, size_done)) {
+ ret = -EFAULT;
+ break;
+ }
+
+ buff_user += size_done;
+ size_done = 0;
+ uvcb.dump_area_origin = (u64)buff_kvm;
+ }
+ } while (buff_user_len);
+
+ /* Report back where we ended dumping */
+ *gaddr = uvcb.gaddr;
+
+ /* Lets only log errors, we don't want to spam */
+out:
+ if (ret)
+ KVM_UV_EVENT(kvm, 3,
+ "PROTVIRT DUMP STORAGE STATE: addr %llx ret %d, uvcb rc %x rrc %x",
+ uvcb.gaddr, ret, uvcb.header.rc, uvcb.header.rrc);
+ *rc = uvcb.header.rc;
+ *rrc = uvcb.header.rrc;
+ vfree(buff_kvm);
+
+ return ret;
+}
+
+/**
+ * kvm_s390_pv_dump_complete
+ *
+ * @kvm: pointer to the guest's KVM struct
+ * @buff_user: Userspace pointer where we will write the results to
+ * @rc: Pointer to where the uvcb return code is stored
+ * @rrc: Pointer to where the uvcb return reason code is stored
+ *
+ * Completes the dumping operation and writes the completion data to
+ * user space.
+ *
+ * Context: kvm->lock needs to be held
+ *
+ * Return:
+ * 0 on success
+ * -ENOMEM if allocating the completion buffer fails
+ * -EINVAL if the UV call fails, rc and rrc will be set in this case
+ * -EFAULT if copying the result to buff_user failed
+ */
+int kvm_s390_pv_dump_complete(struct kvm *kvm, void __user *buff_user,
+ u16 *rc, u16 *rrc)
+{
+ struct uv_cb_dump_complete complete = {
+ .header.len = sizeof(complete),
+ .header.cmd = UVC_CMD_DUMP_COMPLETE,
+ .config_handle = kvm_s390_pv_get_handle(kvm),
+ };
+ u64 *compl_data;
+ int ret;
+
+ /* Allocate dump area */
+ compl_data = vzalloc(uv_info.conf_dump_finalize_len);
+ if (!compl_data)
+ return -ENOMEM;
+ complete.dump_area_origin = (u64)compl_data;
+
+ ret = uv_call_sched(0, (u64)&complete);
+ *rc = complete.header.rc;
+ *rrc = complete.header.rrc;
+ KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP COMPLETE: rc %x rrc %x",
+ complete.header.rc, complete.header.rrc);
+
+ if (!ret) {
+ /*
+ * kvm_s390_pv_dealloc_vm() will also (mem)set
+ * this to false on a reboot or other destroy
+ * operation for this vm.
+ */
+ kvm->arch.pv.dumping = false;
+ kvm_s390_vcpu_unblock_all(kvm);
+ ret = copy_to_user(buff_user, compl_data, uv_info.conf_dump_finalize_len);
+ if (ret)
+ ret = -EFAULT;
+ }
+ vfree(compl_data);
+ /* If the UVC returned an error, translate it to -EINVAL */
+ if (ret > 0)
+ ret = -EINVAL;
+ return ret;
+}
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index 8aaee2892ec3..cb747bf6c798 100644
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -480,9 +480,9 @@ int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
struct kvm_vcpu *dest_vcpu;
u8 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
- trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
-
if (order_code == SIGP_EXTERNAL_CALL) {
+ trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
+
dest_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
BUG_ON(dest_vcpu == NULL);
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index dada78b92691..94138f8f0c1c 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -503,6 +503,14 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
/* Host-protection-interruption introduced with ESOP */
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP))
scb_s->ecb |= scb_o->ecb & ECB_HOSTPROTINT;
+ /*
+ * CPU Topology
+ * This facility only uses the utility field of the SCA and none of
+ * the cpu entries that are problematic with the other interpretation
+ * facilities so we can pass it through
+ */
+ if (test_kvm_facility(vcpu->kvm, 11))
+ scb_s->ecb |= scb_o->ecb & ECB_PTF;
/* transactional execution */
if (test_kvm_facility(vcpu->kvm, 73) && wants_tx) {
/* remap the prefix is tx is toggled on */
generated by cgit (git 2.34.1) at 2025-02-24 12:03:13 +0000