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Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
-rw-r--r--arch/s390/kvm/kvm-s390.c105
1 files changed, 98 insertions, 7 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index c1c7c683fa26..ba694d2ba51e 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -59,6 +59,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
{ "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
{ "exit_wait_state", VCPU_STAT(exit_wait_state) },
+ { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
{ "instruction_stidp", VCPU_STAT(instruction_stidp) },
{ "instruction_spx", VCPU_STAT(instruction_spx) },
{ "instruction_stpx", VCPU_STAT(instruction_stpx) },
@@ -84,6 +85,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
};
static unsigned long long *facilities;
+static struct gmap_notifier gmap_notifier;
/* Section: not file related */
int kvm_arch_hardware_enable(void *garbage)
@@ -96,13 +98,18 @@ void kvm_arch_hardware_disable(void *garbage)
{
}
+static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address);
+
int kvm_arch_hardware_setup(void)
{
+ gmap_notifier.notifier_call = kvm_gmap_notifier;
+ gmap_register_ipte_notifier(&gmap_notifier);
return 0;
}
void kvm_arch_hardware_unsetup(void)
{
+ gmap_unregister_ipte_notifier(&gmap_notifier);
}
void kvm_arch_check_processor_compat(void *rtn)
@@ -239,6 +246,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm->arch.gmap = gmap_alloc(current->mm);
if (!kvm->arch.gmap)
goto out_nogmap;
+ kvm->arch.gmap->private = kvm;
}
kvm->arch.css_support = 0;
@@ -270,7 +278,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
free_page((unsigned long)(vcpu->arch.sie_block));
kvm_vcpu_uninit(vcpu);
- kfree(vcpu);
+ kmem_cache_free(kvm_vcpu_cache, vcpu);
}
static void kvm_free_vcpus(struct kvm *kvm)
@@ -309,6 +317,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
vcpu->arch.gmap = gmap_alloc(current->mm);
if (!vcpu->arch.gmap)
return -ENOMEM;
+ vcpu->arch.gmap->private = vcpu->kvm;
return 0;
}
@@ -373,8 +382,10 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
CPUSTAT_SM |
- CPUSTAT_STOPPED);
+ CPUSTAT_STOPPED |
+ CPUSTAT_GED);
vcpu->arch.sie_block->ecb = 6;
+ vcpu->arch.sie_block->ecb2 = 8;
vcpu->arch.sie_block->eca = 0xC1002001U;
vcpu->arch.sie_block->fac = (int) (long) facilities;
hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
@@ -397,7 +408,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
rc = -ENOMEM;
- vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
+ vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
if (!vcpu)
goto out;
@@ -427,7 +438,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
vcpu->arch.local_int.float_int = &kvm->arch.float_int;
spin_lock(&kvm->arch.float_int.lock);
kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
- init_waitqueue_head(&vcpu->arch.local_int.wq);
+ vcpu->arch.local_int.wq = &vcpu->wq;
vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
spin_unlock(&kvm->arch.float_int.lock);
@@ -442,7 +453,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
out_free_sie_block:
free_page((unsigned long)(vcpu->arch.sie_block));
out_free_cpu:
- kfree(vcpu);
+ kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
return ERR_PTR(rc);
}
@@ -454,6 +465,50 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
return 0;
}
+void s390_vcpu_block(struct kvm_vcpu *vcpu)
+{
+ atomic_set_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
+}
+
+void s390_vcpu_unblock(struct kvm_vcpu *vcpu)
+{
+ atomic_clear_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
+}
+
+/*
+ * Kick a guest cpu out of SIE and wait until SIE is not running.
+ * If the CPU is not running (e.g. waiting as idle) the function will
+ * return immediately. */
+void exit_sie(struct kvm_vcpu *vcpu)
+{
+ atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
+ while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
+ cpu_relax();
+}
+
+/* Kick a guest cpu out of SIE and prevent SIE-reentry */
+void exit_sie_sync(struct kvm_vcpu *vcpu)
+{
+ s390_vcpu_block(vcpu);
+ exit_sie(vcpu);
+}
+
+static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
+{
+ int i;
+ struct kvm *kvm = gmap->private;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ /* match against both prefix pages */
+ if (vcpu->arch.sie_block->prefix == (address & ~0x1000UL)) {
+ VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
+ kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
+ exit_sie_sync(vcpu);
+ }
+ }
+}
+
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
/* kvm common code refers to this, but never calls it */
@@ -606,6 +661,27 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
return -EINVAL; /* not implemented yet */
}
+static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
+{
+ /*
+ * We use MMU_RELOAD just to re-arm the ipte notifier for the
+ * guest prefix page. gmap_ipte_notify will wait on the ptl lock.
+ * This ensures that the ipte instruction for this request has
+ * already finished. We might race against a second unmapper that
+ * wants to set the blocking bit. Lets just retry the request loop.
+ */
+ while (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
+ int rc;
+ rc = gmap_ipte_notify(vcpu->arch.gmap,
+ vcpu->arch.sie_block->prefix,
+ PAGE_SIZE * 2);
+ if (rc)
+ return rc;
+ s390_vcpu_unblock(vcpu);
+ }
+ return 0;
+}
+
static int __vcpu_run(struct kvm_vcpu *vcpu)
{
int rc;
@@ -621,6 +697,10 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
if (!kvm_is_ucontrol(vcpu->kvm))
kvm_s390_deliver_pending_interrupts(vcpu);
+ rc = kvm_s390_handle_requests(vcpu);
+ if (rc)
+ return rc;
+
vcpu->arch.sie_block->icptcode = 0;
preempt_disable();
kvm_guest_enter();
@@ -630,7 +710,9 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
trace_kvm_s390_sie_enter(vcpu,
atomic_read(&vcpu->arch.sie_block->cpuflags));
rc = sie64a(vcpu->arch.sie_block, vcpu->run->s.regs.gprs);
- if (rc) {
+ if (rc > 0)
+ rc = 0;
+ if (rc < 0) {
if (kvm_is_ucontrol(vcpu->kvm)) {
rc = SIE_INTERCEPT_UCONTROL;
} else {
@@ -1046,7 +1128,7 @@ static int __init kvm_s390_init(void)
return -ENOMEM;
}
memcpy(facilities, S390_lowcore.stfle_fac_list, 16);
- facilities[0] &= 0xff00fff3f47c0000ULL;
+ facilities[0] &= 0xff82fff3f47c0000ULL;
facilities[1] &= 0x001c000000000000ULL;
return 0;
}
@@ -1059,3 +1141,12 @@ static void __exit kvm_s390_exit(void)
module_init(kvm_s390_init);
module_exit(kvm_s390_exit);
+
+/*
+ * Enable autoloading of the kvm module.
+ * Note that we add the module alias here instead of virt/kvm/kvm_main.c
+ * since x86 takes a different approach.
+ */
+#include <linux/miscdevice.h>
+MODULE_ALIAS_MISCDEV(KVM_MINOR);
+MODULE_ALIAS("devname:kvm");