KVM: Add support for enabling capabilities per-vcpu
Some times we don't want all capabilities to be available to all
our vcpus. One example for that is the OSI interface, implemented
in the next patch.
In order to have a generic mechanism in how to enable capabilities
individually, this patch introduces a new ioctl that can be used
for this purpose. That way features we don't want in all guests or
userspace configurations can just not be enabled and we're good.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index c36d093e..ecb68e4 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -400,6 +400,15 @@
__u8 pad[36];
};
+/* for KVM_ENABLE_CAP */
+struct kvm_enable_cap {
+ /* in */
+ __u32 cap;
+ __u32 flags;
+ __u64 args[4];
+ __u8 pad[64];
+};
+
#define KVMIO 0xAE
/*
@@ -508,6 +517,7 @@
#endif
#define KVM_CAP_X86_ROBUST_SINGLESTEP 51
#define KVM_CAP_PPC_UNSET_IRQ 53
+#define KVM_CAP_ENABLE_CAP 54
#ifdef KVM_CAP_IRQ_ROUTING
@@ -697,6 +707,7 @@
/* Available with KVM_CAP_DEBUGREGS */
#define KVM_GET_DEBUGREGS _IOR(KVMIO, 0xa1, struct kvm_debugregs)
#define KVM_SET_DEBUGREGS _IOW(KVMIO, 0xa2, struct kvm_debugregs)
+#define KVM_ENABLE_CAP _IOW(KVMIO, 0xa3, struct kvm_enable_cap)
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)