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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2015-11-25 11:13:32 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2016-06-21 09:43:37 +0200
commit166ecb3d3cfecb62c31fdeab9949d70e84cd75cd (patch)
tree9cc1cce48f14d90406ac9e652aede6c6dc94ae23 /arch/s390/kvm
parentbbeaa58b32ab627b68748543b3dcb98b9a28d570 (diff)
KVM: s390: vsie: support transactional execution
As soon as guest 2 is allowed to use transactional execution (indicated via STFLE), he can also enable it for guest 3. Active transactional execution requires also the second prefix page to be mapped. If that page cannot be mapped, a validity icpt has to be presented to the guest. We have to take care of tx being toggled on/off, otherwise we might get wrong prefix validity icpt. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm')
-rw-r--r--arch/s390/kvm/vsie.c37
1 files changed, 35 insertions, 2 deletions
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 6b26b0be63c1..4e2c71cced48 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -239,6 +239,7 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
+ bool had_tx = scb_s->ecb & 0x10U;
unsigned long new_mso;
int rc;
@@ -299,6 +300,13 @@ 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 & 0x02U;
+ /* transactional execution */
+ if (test_kvm_facility(vcpu->kvm, 73)) {
+ /* remap the prefix is tx is toggled on */
+ if ((scb_o->ecb & 0x10U) && !had_tx)
+ prefix_unmapped(vsie_page);
+ scb_s->ecb |= scb_o->ecb & 0x10U;
+ }
prepare_ibc(vcpu, vsie_page);
rc = shadow_crycb(vcpu, vsie_page);
@@ -337,13 +345,13 @@ void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
prefix = cur->scb_s.prefix << GUEST_PREFIX_SHIFT;
/* with mso/msl, the prefix lies at an offset */
prefix += cur->scb_s.mso;
- if (prefix <= end && start <= prefix + PAGE_SIZE - 1)
+ if (prefix <= end && start <= prefix + 2 * PAGE_SIZE - 1)
prefix_unmapped_sync(cur);
}
}
/*
- * Map the first prefix page.
+ * Map the first prefix page and if tx is enabled also the second prefix page.
*
* The prefix will be protected, a gmap notifier will inform about unmaps.
* The shadow scb must not be executed until the prefix is remapped, this is
@@ -370,6 +378,9 @@ static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
prefix += scb_s->mso;
rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, prefix);
+ if (!rc && (scb_s->ecb & 0x10U))
+ rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
+ prefix + PAGE_SIZE);
/*
* We don't have to mprotect, we will be called for all unshadows.
* SIE will detect if protection applies and trigger a validity.
@@ -434,6 +445,13 @@ static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
scb_s->scaol = 0;
scb_s->scaoh = 0;
}
+
+ hpa = scb_s->itdba;
+ if (hpa) {
+ gpa = scb_o->itdba & ~0xffUL;
+ unpin_guest_page(vcpu->kvm, gpa, hpa);
+ scb_s->itdba = 0;
+ }
}
/*
@@ -477,6 +495,21 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
scb_s->scaoh = (u32)((u64)hpa >> 32);
scb_s->scaol = (u32)(u64)hpa;
}
+
+ gpa = scb_o->itdba & ~0xffUL;
+ if (gpa && (scb_s->ecb & 0x10U)) {
+ if (!(gpa & ~0x1fffU)) {
+ rc = set_validity_icpt(scb_s, 0x0080U);
+ goto unpin;
+ }
+ /* 256 bytes cannot cross page boundaries */
+ rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
+ if (rc == -EINVAL)
+ rc = set_validity_icpt(scb_s, 0x0080U);
+ if (rc)
+ goto unpin;
+ scb_s->itdba = hpa;
+ }
return 0;
unpin:
unpin_blocks(vcpu, vsie_page);