From: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
use_cmma in kvm_arch means that the KVM hypervisor is allowed to use
cmma, whereas use_cmma in the mm context means cmm has been used before.
Let's rename the context one to uses_cmm, as the vm does use
collaborative memory management but the host uses the cmm assist
(interpretation facility).
Also let's introduce use_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>
Message-Id: <1518779775-256056-2-git-send-email-frankja@xxxxxxxxxxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
arch/s390/include/asm/kvm_host.h | 1 +
arch/s390/include/asm/mmu.h | 4 ++--
arch/s390/include/asm/mmu_context.h | 2 +-
arch/s390/kvm/kvm-s390.c | 23 ++++++++++++-----------
arch/s390/kvm/priv.c | 4 ++--
5 files changed, 18 insertions(+), 16 deletions(-)
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index afb0f08b8021..27918b15a8ba 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -792,6 +792,7 @@ struct kvm_arch{
int css_support;
int use_irqchip;
int use_cmma;
+ int use_pfmfi;
int user_cpu_state_ctrl;
int user_sigp;
int user_stsi;
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index db35c41a59d5..c639c95850e4 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -22,8 +22,8 @@ typedef struct {
unsigned int has_pgste:1;
/* The mmu context uses storage keys. */
unsigned int use_skey:1;
- /* The mmu context uses CMMA. */
- unsigned int use_cmma:1;
+ /* The mmu context uses CMM. */
+ unsigned int uses_cmm:1;
} mm_context_t;
#define INIT_MM_CONTEXT(name) \
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 65154eaa3714..d3ebfa8f8a9f 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -31,7 +31,7 @@ static inline int init_new_context(struct task_struct *tsk,
(current->mm && current->mm->context.alloc_pgste);
mm->context.has_pgste = 0;
mm->context.use_skey = 0;
- mm->context.use_cmma = 0;
+ mm->context.uses_cmm = 0;
#endif
switch (mm->context.asce_limit) {
case _REGION2_SIZE:
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 56061cf82f01..957be1c51a4b 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -699,6 +699,8 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
mutex_lock(&kvm->lock);
if (!kvm->created_vcpus) {
kvm->arch.use_cmma = 1;
+ /* Not compatible with cmma. */
+ kvm->arch.use_pfmfi = 0;
ret = 0;
}
mutex_unlock(&kvm->lock);
@@ -1603,7 +1605,7 @@ static int kvm_s390_get_cmma_bits(struct kvm *kvm,
return -EINVAL;
/* CMMA is disabled or was not used, or the buffer has length zero */
bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
- if (!bufsize || !kvm->mm->context.use_cmma) {
+ if (!bufsize || !kvm->mm->context.uses_cmm) {
memset(args, 0, sizeof(*args));
return 0;
}
@@ -1680,7 +1682,7 @@ static int kvm_s390_get_cmma_bits(struct kvm *kvm,
/*
* This function sets the CMMA attributes for the given pages. If the input
* buffer has zero length, no action is taken, otherwise the attributes are
- * set and the mm->context.use_cmma flag is set.
+ * set and the mm->context.uses_cmm flag is set.
*/
static int kvm_s390_set_cmma_bits(struct kvm *kvm,
const struct kvm_s390_cmma_log *args)
@@ -1730,9 +1732,9 @@ static int kvm_s390_set_cmma_bits(struct kvm *kvm,
srcu_read_unlock(&kvm->srcu, srcu_idx);
up_read(&kvm->mm->mmap_sem);
- if (!kvm->mm->context.use_cmma) {
+ if (!kvm->mm->context.uses_cmm) {
down_write(&kvm->mm->mmap_sem);
- kvm->mm->context.use_cmma = 1;
+ kvm->mm->context.uses_cmm = 1;
up_write(&kvm->mm->mmap_sem);
}
out:
@@ -2043,6 +2045,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm->arch.css_support = 0;
kvm->arch.use_irqchip = 0;
+ kvm->arch.use_pfmfi = sclp.has_pfmfi;
kvm->arch.epoch = 0;
spin_lock_init(&kvm->arch.start_stop_lock);
@@ -2469,8 +2472,6 @@ 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;
}
@@ -2506,7 +2507,7 @@ 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.use_pfmfi)
vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
if (test_kvm_facility(vcpu->kvm, 130))
vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
@@ -3038,7 +3039,7 @@ static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
/*
- * Disable CMMA virtualization; we will emulate the ESSA
+ * Disable CMM virtualization; we will emulate the ESSA
* instruction manually, in order to provide additional
* functionalities needed for live migration.
*/
@@ -3048,11 +3049,11 @@ static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
/*
- * Re-enable CMMA virtualization if CMMA is available and
- * was used.
+ * Re-enable CMM virtualization if CMMA is available and
+ * CMM has been used.
*/
if ((vcpu->kvm->arch.use_cmma) &&
- (vcpu->kvm->mm->context.use_cmma))
+ (vcpu->kvm->mm->context.uses_cmm))
vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
goto retry;
}
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index f0b4185158af..ebfa0442e569 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -1078,9 +1078,9 @@ static int handle_essa(struct kvm_vcpu *vcpu)
* value really needs to be written to; if the value is
* already correct, we do nothing and avoid the lock.
*/
- if (vcpu->kvm->mm->context.use_cmma == 0) {
+ if (vcpu->kvm->mm->context.uses_cmm == 0) {
down_write(&vcpu->kvm->mm->mmap_sem);
- vcpu->kvm->mm->context.use_cmma = 1;
+ vcpu->kvm->mm->context.uses_cmm = 1;
up_write(&vcpu->kvm->mm->mmap_sem);
}
/*
--
2.14.3
--
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