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KVM: s390: allow 255 VCPUs when sca entries aren't used

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If the SCA entries aren't used by the hardware (no SIGPIF), we
can simply not set the entries, stick to the basic sca and allow more
than 64 VCPUs.

To hinder any other facility from using these entries, let's properly
provoke intercepts by not setting the MCN and keeping the entries
unset.

This effectively allows when running KVM under KVM (vSIE) or under z/VM to
provide more than 64 VCPUs to a guest. Let's limit it to 255 for now, to
not run into problems if the CPU numbers are limited somewhere else.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand
2016-08-08 22:39:32 +02:00
committed by Christian Borntraeger
parent 80cd876338
commit a6940674c3
4 changed files with 32 additions and 2 deletions
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2
arch/s390/include/asm/kvm_host.h
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@@ -28,7 +28,7 @@
#define KVM_S390_BSCA_CPU_SLOTS 64
#define KVM_S390_ESCA_CPU_SLOTS 248
#define KVM_MAX_VCPUS KVM_S390_ESCA_CPU_SLOTS
#define KVM_MAX_VCPUS 255
#define KVM_USER_MEM_SLOTS 32
/*