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KVM: s390: Enable up to 248 VCPUs per VM

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This patch allows s390 to have more than 64 VCPUs for a guest (up to
248 for memory usage considerations), if supported by the underlaying
hardware (sclp.has_esca).

Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Eugene (jno) Dvurechenski 2015-04-22 18:37:40 +02:00 committed by Christian Borntraeger
parent 5e04431523
commit fe0edcb731
2 changed files with 3 additions and 2 deletions
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2
arch/s390/include/asm/kvm_host.h
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@ -27,7 +27,7 @@
#define KVM_S390_BSCA_CPU_SLOTS 64
#define KVM_S390_ESCA_CPU_SLOTS 248
#define KVM_MAX_VCPUS KVM_S390_BSCA_CPU_SLOTS
#define KVM_MAX_VCPUS KVM_S390_ESCA_CPU_SLOTS
#define KVM_USER_MEM_SLOTS 32
/*

3
arch/s390/kvm/kvm-s390.c
View file

@ -246,7 +246,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
break;
case KVM_CAP_NR_VCPUS:
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
r = sclp.has_esca ? KVM_S390_ESCA_CPU_SLOTS
: KVM_S390_BSCA_CPU_SLOTS;
break;
case KVM_CAP_NR_MEMSLOTS:
r = KVM_USER_MEM_SLOTS;