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authorChristian Borntraeger <borntraeger@de.ibm.com>2020-03-27 10:06:42 +0300
committerChristian Borntraeger <borntraeger@de.ibm.com>2020-03-27 13:42:53 +0300
commit7a2653612bb6f18fb236c5b0c4d28f7b459bf7c2 (patch)
tree15c690814a85cacbcfe58c052d5b058e64c8cab0 /Documentation/virt
parentf3dd18d444c757840920434e62809b6104081b06 (diff)
downloadlinux-7a2653612bb6f18fb236c5b0c4d28f7b459bf7c2.tar.xz
s390/gmap: return proper error code on ksm unsharing
If a signal is pending we might return -ENOMEM instead of -EINTR. We should propagate the proper error during KSM unsharing. unmerge_ksm_pages returns -ERESTARTSYS on signal_pending. This gets translated by entry.S to -EINTR. It is important to get this error code so that userspace can retry. To make this clearer we also add -EINTR to the documentation of the PV_ENABLE call, which calls unmerge_ksm_pages. Fixes: 3ac8e38015d4 ("s390/mm: disable KSM for storage key enabled pages") Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com> Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com> Tested-by: Marc Hartmayer <mhartmay@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'Documentation/virt')
-rw-r--r--Documentation/virt/kvm/api.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index bae90f3cd11d..2edb28bd07a9 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -4677,6 +4677,12 @@ KVM_PV_ENABLE
command has succeeded, any CPU added via hotplug will become
protected during its creation as well.
+ Errors:
+
+ ===== =============================
+ EINTR an unmasked signal is pending
+ ===== =============================
+
KVM_PV_DISABLE
Deregister the VM from the Ultravisor and reclaim the memory that