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mirror_ubuntu-kernels/arch/s390/kvm
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Janosch Frank 40ebdb8e59 KVM: s390: Make huge pages unavailable in ucontrol VMs 
We currently do not notify all gmaps when using gmap_pmdp_xchg(), due
to locking constraints. This makes ucontrol VMs, which is the only VM
type that creates multiple gmaps, incompatible with huge pages. Also
we would need to hold the guest_table_lock of all gmaps that have this
vmaddr maped to synchronize access to the pmd.

ucontrol VMs are rather exotic and creating a new locking concept is
no easy task. Hence we return EINVAL when trying to active
KVM_CAP_S390_HPAGE_1M and report it as being not available when
checking for it.

Fixes: a4499382 ("KVM: s390: Add huge page enablement control")
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20180801112508.138159-1-frankja@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
2018-09-12 14:46:37 +02:00
..
diag.c KVM: s390: add vcpu stat counters for many instruction 2018-01-24 16:49:02 +01:00
gaccess.c treewide: Use array_size() in vmalloc() 2018-06-12 16:19:22 -07:00
gaccess.h KVM: s390: Remove redundant license text 2017-12-06 09:18:42 +01:00
guestdbg.c KVM: s390: introduce defines for control registers 2018-05-17 09:02:27 +02:00
intercept.c KVM: s390: add exit io request stats and simplify code 2018-03-14 19:21:11 +00:00
interrupt.c sched/swait: Rename to exclusive 2018-06-20 11:35:56 +02:00
irq.h KVM: s390: Remove redundant license text 2017-12-06 09:18:42 +01:00
Kconfig KVM: introduce kvm_arch_vcpu_async_ioctl 2017-12-14 09:26:59 +01:00
kvm-s390.c KVM: s390: Make huge pages unavailable in ucontrol VMs 2018-09-12 14:46:37 +02:00
kvm-s390.h KVM: s390: reset crypto attributes for all vcpus 2018-05-17 09:02:10 +02:00
Makefile KVM: s390: Remove redundant license text 2017-12-06 09:18:42 +01:00
priv.c KVM: s390: Fix pfmf and conditional skey emulation 2018-09-04 11:24:43 +02:00
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: vsie: copy wrapping keys to right place 2018-09-04 11:26:11 +02:00