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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2020-03-27 08:06:42 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2020-03-27 06:42:53 -0400 |
| commit | 7a2653612bb6f18fb236c5b0c4d28f7b459bf7c2 (patch) | |
| tree | 15c690814a85cacbcfe58c052d5b058e64c8cab0 /Documentation/virt | |
| parent | f3dd18d444c757840920434e62809b6104081b06 (diff) | |
| download | lwn-7a2653612bb6f18fb236c5b0c4d28f7b459bf7c2.tar.gz lwn-7a2653612bb6f18fb236c5b0c4d28f7b459bf7c2.zip | |
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.rst | 6 |
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 |