Re: [PATCH 1/3] kvm: s390: Per-vm kvm device controls

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On 10.04.14 13:16, Christian Borntraeger wrote:
From: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx>

We sometimes need to get/set attributes specific to a virtual machine
and so need something else than ONE_REG.

Let's copy the KVM_DEVICE approach, and define the respective ioctls
for the vm file descriptor.

Signed-off-by: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
  Documentation/virtual/kvm/api.txt        |  8 ++---
  Documentation/virtual/kvm/devices/vm.txt |  6 ++++
  arch/s390/kvm/kvm-s390.c                 | 54 ++++++++++++++++++++++++++++++++
  include/uapi/linux/kvm.h                 |  1 +
  4 files changed, 65 insertions(+), 4 deletions(-)
  create mode 100644 Documentation/virtual/kvm/devices/vm.txt

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index c24211d..f69731a 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2314,8 +2314,8 @@ struct kvm_create_device {
4.80 KVM_SET_DEVICE_ATTR/KVM_GET_DEVICE_ATTR -Capability: KVM_CAP_DEVICE_CTRL
-Type: device ioctl
+Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device
+Type: device ioctl, vm ioctl
  Parameters: struct kvm_device_attr
  Returns: 0 on success, -1 on error
  Errors:
@@ -2340,8 +2340,8 @@ struct kvm_device_attr {
4.81 KVM_HAS_DEVICE_ATTR -Capability: KVM_CAP_DEVICE_CTRL
-Type: device ioctl
+Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device
+Type: device ioctl, vm ioctl
  Parameters: struct kvm_device_attr
  Returns: 0 on success, -1 on error
  Errors:
diff --git a/Documentation/virtual/kvm/devices/vm.txt b/Documentation/virtual/kvm/devices/vm.txt
new file mode 100644
index 0000000..4fe1532
--- /dev/null
+++ b/Documentation/virtual/kvm/devices/vm.txt
@@ -0,0 +1,6 @@
+Generic vm interface
+====================================
+
+The interface handles per-vm attributes, such as CMMA status on s390 and is
+similar in way to ONE_REG, but targeting the whole vm instead of one vcpu
+alone. It is available with KVM_CAP_VM_ATTRIBUTES.

This document doesn't sound impressively useful :).


Alex

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