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KVM: s390: Refactor host cmma and pfmfi interpretation controls 

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@linux.vnet.ibm.com>
Message-Id: <1518779775-256056-2-git-send-email-frankja@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank 2018-02-16 12:16:14 +01:00 committed by Christian Borntraeger
parent c3b9e3e1ea
commit c9f0a2b87f
5 changed files with 18 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/s390/include/asm/kvm_host.h
View File

@ -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;

4
arch/s390/include/asm/mmu.h
View File

@ -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) \

2
arch/s390/include/asm/mmu_context.h
View File

@ -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:

23
arch/s390/kvm/kvm-s390.c
View File

@ -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 @@ retry:
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 @@ retry:
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;
}

4
arch/s390/kvm/priv.c
View File

@ -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);
}
/*