From ae2113a4f1a6cd5a3cd3d75f394547922758e9ac Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 2 Jun 2014 11:03:00 +1000 Subject: 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 Signed-off-by: Alexander Graf --- Documentation/virtual/kvm/api.txt | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/virtual') 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. -- cgit v1.2.3