use_cmma in kvm_arch means that the vm is allowed to use cmma, whereas
use_cmma in the mm context means it has been used before. Let's rename
the kvm_arch one to has_cmma
Also let's introduce has_pfmfi, so we can remove the pfmfi disablement
when we activate cmma and rather not activate it in the first place.
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
---
arch/s390/include/asm/kvm_host.h | 3 ++-
arch/s390/kvm/kvm-s390.c | 25 +++++++++++++------------
arch/s390/kvm/priv.c | 2 +-
3 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index afb0f08..b768754 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -791,7 +791,8 @@ struct kvm_arch{
unsigned long mem_limit;
int css_support;
int use_irqchip;
- int use_cmma;
+ int has_cmma;
+ int has_pfmfi;
int user_cpu_state_ctrl;
int user_sigp;
int user_stsi;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 4a2d68c..781aaf0 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -655,7 +655,9 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
mutex_lock(&kvm->lock);
if (!kvm->created_vcpus) {
- kvm->arch.use_cmma = 1;
+ kvm->arch.has_cmma = 1;
+ /* Not compatible with cmma. */
+ kvm->arch.has_pfmfi = 0;
ret = 0;
}
mutex_unlock(&kvm->lock);
@@ -665,7 +667,7 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
if (!sclp.has_cmma)
break;
ret = -EINVAL;
- if (!kvm->arch.use_cmma)
+ if (!kvm->arch.has_cmma)
break;
VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
@@ -810,7 +812,7 @@ static int kvm_s390_vm_start_migration(struct kvm *kvm)
return -ENOMEM;
kvm->arch.migration_state = mgs;
- if (kvm->arch.use_cmma) {
+ if (kvm->arch.has_cmma) {
/*
* Get the first slot. They are reverse sorted by base_gfn, so
* the first slot is also the one at the end of the address
@@ -855,7 +857,7 @@ static int kvm_s390_vm_stop_migration(struct kvm *kvm)
mgs = kvm->arch.migration_state;
kvm->arch.migration_state = NULL;
- if (kvm->arch.use_cmma) {
+ if (kvm->arch.has_cmma) {
kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
/* We have to wait for the essa emulation to finish */
synchronize_srcu(&kvm->srcu);
@@ -1551,7 +1553,7 @@ static int kvm_s390_get_cmma_bits(struct kvm *kvm,
cur = args->start_gfn;
i = next = pgstev = 0;
- if (unlikely(!kvm->arch.use_cmma))
+ if (unlikely(!kvm->arch.has_cmma))
return -ENXIO;
/* Invalid/unsupported flags were specified */
if (args->flags & ~KVM_S390_CMMA_PEEK)
@@ -1650,7 +1652,7 @@ static int kvm_s390_set_cmma_bits(struct kvm *kvm,
mask = args->mask;
- if (!kvm->arch.use_cmma)
+ if (!kvm->arch.has_cmma)
return -ENXIO;
/* invalid/unsupported flags */
if (args->flags != 0)
@@ -2007,6 +2009,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm->arch.css_support = 0;
kvm->arch.use_irqchip = 0;
+ kvm->arch.has_pfmfi = sclp.has_pfmfi;
kvm->arch.epoch = 0;
spin_lock_init(&kvm->arch.start_stop_lock);
@@ -2045,7 +2048,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
if (kvm_is_ucontrol(vcpu->kvm))
gmap_remove(vcpu->arch.gmap);
- if (vcpu->kvm->arch.use_cmma)
+ if (vcpu->kvm->arch.has_cmma)
kvm_s390_vcpu_unsetup_cmma(vcpu);
free_page((unsigned long)(vcpu->arch.sie_block));
@@ -2431,8 +2434,6 @@ int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
if (!vcpu->arch.sie_block->cbrlo)
return -ENOMEM;
-
- vcpu->arch.sie_block->ecb2 &= ~ECB2_PFMFI;
return 0;
}
@@ -2468,7 +2469,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
if (test_kvm_facility(vcpu->kvm, 73))
vcpu->arch.sie_block->ecb |= ECB_TE;
- if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
+ if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.has_pfmfi)
vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
if (test_kvm_facility(vcpu->kvm, 130))
vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
@@ -2502,7 +2503,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
else
vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
- if (vcpu->kvm->arch.use_cmma) {
+ if (vcpu->kvm->arch.has_cmma) {
rc = kvm_s390_vcpu_setup_cmma(vcpu);
if (rc)
return rc;
@@ -3013,7 +3014,7 @@ static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
* Re-enable CMMA virtualization if CMMA is available and
* was used.
*/
- if ((vcpu->kvm->arch.use_cmma) &&
+ if ((vcpu->kvm->arch.has_cmma) &&
(vcpu->kvm->mm->context.use_cmma))
vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
goto retry;
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index c4c4e15..908b579 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -1050,7 +1050,7 @@ static int handle_essa(struct kvm_vcpu *vcpu)
VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
gmap = vcpu->arch.gmap;
vcpu->stat.instruction_essa++;
- if (!vcpu->kvm->arch.use_cmma)
+ if (!vcpu->kvm->arch.has_cmma)
return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
--
2.7.4
--
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