linux/arch/s390/kvm
David Hildenbrand f07afa0462 KVM: s390: fix memory overwrites when not using SCA entries
Even if we don't have extended SCA support, we can have more than 64 CPUs
if we don't enable any HW features that might use the SCA entries.

Now, this works just fine, but we missed a return, which is why we
would actually store the SCA entries. If we have more than 64 CPUs, this
means writing outside of the basic SCA - bad.

Let's fix this. This allows > 64 CPUs when running nested (under vSIE)
without random crashes.

Fixes: a6940674c3 ("KVM: s390: allow 255 VCPUs when sca entries aren't used")
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180306132758.21034-1-david@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2018-03-06 13:33:02 +00:00
..
Kconfig KVM: introduce kvm_arch_vcpu_async_ioctl 2017-12-14 09:26:59 +01:00
Makefile KVM: s390: Remove redundant license text 2017-12-06 09:18:42 +01:00
diag.c KVM: s390: add vcpu stat counters for many instruction 2018-01-24 16:49:02 +01:00
gaccess.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gaccess.h KVM: s390: Remove redundant license text 2017-12-06 09:18:42 +01:00
guestdbg.c KVM: s390: Remove redundant license text 2017-12-06 09:18:42 +01:00
intercept.c KVM: s390: use switch vs jump table in intercept.c 2018-02-14 13:53:43 +00:00
interrupt.c KVM: s390: take care of clock-comparator sign control 2018-02-20 20:50:29 +00:00
irq.h KVM: s390: Remove redundant license text 2017-12-06 09:18:42 +01:00
kvm-s390.c KVM: s390: fix memory overwrites when not using SCA entries 2018-03-06 13:33:02 +00:00
kvm-s390.h KVM: s390: provide only a single function for setting the tod (fix SCK) 2018-02-20 20:51:28 +00:00
priv.c KVM: s390: provide only a single function for setting the tod (fix SCK) 2018-02-20 20:51:28 +00:00
sigp.c KVM: s390: introduce and use kvm_s390_test_cpuflags() 2018-01-24 17:46:42 +01:00
trace-s390.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vsie.c KVM: s390: force bp isolation for VSIE 2018-02-14 12:00:59 +00:00