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Diffstat (limited to 'arch/s390/kvm')
-rw-r--r--arch/s390/kvm/interrupt.c26
-rw-r--r--arch/s390/kvm/kvm-s390.c1
-rw-r--r--arch/s390/kvm/vsie.c50
3 files changed, 41 insertions, 36 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 329b2843fee2..fa557372d600 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -213,6 +213,16 @@ static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
vcpu->arch.local_int.pending_irqs;
}
+static inline int isc_to_irq_type(unsigned long isc)
+{
+ return IRQ_PEND_IO_ISC_0 + isc;
+}
+
+static inline int irq_type_to_isc(unsigned long irq_type)
+{
+ return irq_type - IRQ_PEND_IO_ISC_0;
+}
+
static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
unsigned long active_mask)
{
@@ -220,7 +230,7 @@ static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
for (i = 0; i <= MAX_ISC; i++)
if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
- active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
+ active_mask &= ~(1UL << (isc_to_irq_type(i)));
return active_mask;
}
@@ -901,7 +911,7 @@ static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
fi = &vcpu->kvm->arch.float_int;
spin_lock(&fi->lock);
- isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
+ isc_list = &fi->lists[irq_type_to_isc(irq_type)];
inti = list_first_entry_or_null(isc_list,
struct kvm_s390_interrupt_info,
list);
@@ -1074,6 +1084,12 @@ void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
* in kvm_vcpu_block without having the waitqueue set (polling)
*/
vcpu->valid_wakeup = true;
+ /*
+ * This is mostly to document, that the read in swait_active could
+ * be moved before other stores, leading to subtle races.
+ * All current users do not store or use an atomic like update
+ */
+ smp_mb__after_atomic();
if (swait_active(&vcpu->wq)) {
/*
* The vcpu gave up the cpu voluntarily, mark it as a good
@@ -1395,7 +1411,7 @@ static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
list_del_init(&iter->list);
fi->counters[FIRQ_CNTR_IO] -= 1;
if (list_empty(isc_list))
- clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
+ clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
spin_unlock(&fi->lock);
return iter;
}
@@ -1522,7 +1538,7 @@ static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
isc = int_word_to_isc(inti->io.io_int_word);
list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
list_add_tail(&inti->list, list);
- set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
+ set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
spin_unlock(&fi->lock);
return 0;
}
@@ -2175,6 +2191,8 @@ static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
return -EINVAL;
if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
return -EFAULT;
+ if (!schid)
+ return -EINVAL;
kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
/*
* If userspace is conforming to the architecture, we can have at most
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 4bc70afe0a10..98ad8b9e0360 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -395,6 +395,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_S390_USER_INSTR0:
case KVM_CAP_S390_CMMA_MIGRATION:
case KVM_CAP_S390_AIS:
+ case KVM_CAP_S390_AIS_MIGRATION:
r = 1;
break;
case KVM_CAP_S390_MEM_OP:
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index b18b5652e5c5..a311938b63b3 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -443,22 +443,14 @@ static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
*
* Returns: - 0 on success
* - -EINVAL if the gpa is not valid guest storage
- * - -ENOMEM if out of memory
*/
static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa)
{
struct page *page;
- hva_t hva;
- int rc;
- hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
- if (kvm_is_error_hva(hva))
+ page = gfn_to_page(kvm, gpa_to_gfn(gpa));
+ if (is_error_page(page))
return -EINVAL;
- rc = get_user_pages_fast(hva, 1, 1, &page);
- if (rc < 0)
- return rc;
- else if (rc != 1)
- return -ENOMEM;
*hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK);
return 0;
}
@@ -466,11 +458,7 @@ static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa)
/* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */
static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa)
{
- struct page *page;
-
- page = virt_to_page(hpa);
- set_page_dirty_lock(page);
- put_page(page);
+ kvm_release_pfn_dirty(hpa >> PAGE_SHIFT);
/* mark the page always as dirty for migration */
mark_page_dirty(kvm, gpa_to_gfn(gpa));
}
@@ -557,7 +545,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
rc = set_validity_icpt(scb_s, 0x003bU);
if (!rc) {
rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
- if (rc == -EINVAL)
+ if (rc)
rc = set_validity_icpt(scb_s, 0x0034U);
}
if (rc)
@@ -574,10 +562,10 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
}
/* 256 bytes cannot cross page boundaries */
rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
- if (rc == -EINVAL)
+ if (rc) {
rc = set_validity_icpt(scb_s, 0x0080U);
- if (rc)
goto unpin;
+ }
scb_s->itdba = hpa;
}
@@ -592,10 +580,10 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
* if this block gets bigger, we have to shadow it.
*/
rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
- if (rc == -EINVAL)
+ if (rc) {
rc = set_validity_icpt(scb_s, 0x1310U);
- if (rc)
goto unpin;
+ }
scb_s->gvrd = hpa;
}
@@ -607,11 +595,11 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
}
/* 64 bytes cannot cross page boundaries */
rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
- if (rc == -EINVAL)
+ if (rc) {
rc = set_validity_icpt(scb_s, 0x0043U);
- /* Validity 0x0044 will be checked by SIE */
- if (rc)
goto unpin;
+ }
+ /* Validity 0x0044 will be checked by SIE */
scb_s->riccbd = hpa;
}
if ((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) {
@@ -635,10 +623,10 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
* cross page boundaries
*/
rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
- if (rc == -EINVAL)
+ if (rc) {
rc = set_validity_icpt(scb_s, 0x10b0U);
- if (rc)
goto unpin;
+ }
scb_s->sdnxo = hpa | sdnxc;
}
return 0;
@@ -663,7 +651,6 @@ static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
*
* Returns: - 0 if the scb was pinned.
* - > 0 if control has to be given to guest 2
- * - -ENOMEM if out of memory
*/
static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
gpa_t gpa)
@@ -672,14 +659,13 @@ static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
int rc;
rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
- if (rc == -EINVAL) {
+ if (rc) {
rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- if (!rc)
- rc = 1;
+ WARN_ON_ONCE(rc);
+ return 1;
}
- if (!rc)
- vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa;
- return rc;
+ vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa;
+ return 0;
}
/*
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-07 08:42:25 +0300