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authorPaul Mackerras <paulus@samba.org>2014-06-02 11:03:00 +1000
committerAlexander Graf <agraf@suse.de>2014-07-28 15:22:18 +0200
commitae2113a4f1a6cd5a3cd3d75f394547922758e9ac (patch)
tree59a1dbf6369d853d0ad76c62a0333c47bb8992d0 /Documentation/virtual
parent699a0ea0823d32030b0666b28ff8633960f7ffa7 (diff)
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KVM: PPC: Book3S: Allow only implemented hcalls to be enabled or disabled
This adds code to check that when the KVM_CAP_PPC_ENABLE_HCALL capability is used to enable or disable in-kernel handling of an hcall, that the hcall is actually implemented by the kernel. If not an EINVAL error is returned. This also checks the default-enabled list of hcalls and prints a warning if any hcall there is not actually implemented. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 5c54d196f4c8..69553183ef0f 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3039,3 +3039,7 @@ not to attempt to handle the hcall, but will always exit to userspace
to handle it. Note that it may not make sense to enable some and
disable others of a group of related hcalls, but KVM does not prevent
userspace from doing that.
+
+If the hcall number specified is not one that has an in-kernel
+implementation, the KVM_ENABLE_CAP ioctl will fail with an EINVAL
+error.