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KVM: s390: CMMA tracking, ESSA emulation, migration mode

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* Add a migration state bitmap to keep track of which pages have dirty
  CMMA information.
* Disable CMMA by default, so we can track if it's used or not. Enable
  it on first use like we do for storage keys (unless we are doing a
  migration).
* Creates a VM attribute to enter and leave migration mode.
* In migration mode, CMMA is disabled in the SIE block, so ESSA is
  always interpreted and emulated in software.
* Free the migration state on VM destroy.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Claudio Imbrenda
2016-08-04 17:54:42 +02:00
committed by Christian Borntraeger
parent 865279c53c
commit 190df4a212
5 changed files with 304 additions and 6 deletions
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9
arch/s390/include/asm/kvm_host.h
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@@ -45,6 +45,8 @@
#define KVM_REQ_ENABLE_IBS 8
#define KVM_REQ_DISABLE_IBS 9
#define KVM_REQ_ICPT_OPEREXC 10
#define KVM_REQ_START_MIGRATION 11
#define KVM_REQ_STOP_MIGRATION 12
#define SIGP_CTRL_C 0x80
#define SIGP_CTRL_SCN_MASK 0x3f
@@ -691,6 +693,12 @@ struct kvm_s390_vsie {
struct page *pages[KVM_MAX_VCPUS];
};
struct kvm_s390_migration_state {
unsigned long bitmap_size; /* in bits (number of guest pages) */
atomic64_t dirty_pages; /* number of dirty pages */
unsigned long *pgste_bitmap;
};
struct kvm_arch{
void *sca;
int use_esca;
@@ -718,6 +726,7 @@ struct kvm_arch{
struct kvm_s390_crypto crypto;
struct kvm_s390_vsie vsie;
u64 epoch;
struct kvm_s390_migration_state *migration_state;
/* subset of available cpu features enabled by user space */
DECLARE_BITMAP(cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
};