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

Browse source

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

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/s390/include/asm/kvm_host.h

View file

4

arch/s390/kvm/interrupt.c

View file

18

arch/s390/kvm/kvm-s390.c

View file

10

arch/s390/kvm/kvm-s390.h

View file