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authorAvi Kivity <avi@redhat.com>2010-04-29 12:08:56 +0300
committerAvi Kivity <avi@redhat.com>2010-08-01 10:35:40 +0300
commit47dbb84f9e04e3261585da384d96b8c63f3376e3 (patch)
treec9373e8c202e7d3365e0708170d489b95626b060
parent54a4f0239f2e98bc0842818f611a4cf73bb7dd35 (diff)
KVM: Document KVM_SET_IDENTITY_MAP ioctl
Signed-off-by: Avi Kivity <avi@redhat.com>
-rw-r--r--Documentation/kvm/api.txt18
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt
index a237518e51b9..0f96e5223475 100644
--- a/Documentation/kvm/api.txt
+++ b/Documentation/kvm/api.txt
@@ -892,6 +892,24 @@ arguments.
This ioctl is only useful after KVM_CREATE_IRQCHIP. Without an in-kernel
irqchip, the multiprocessing state must be maintained by userspace.
+4.39 KVM_SET_IDENTITY_MAP_ADDR
+
+Capability: KVM_CAP_SET_IDENTITY_MAP_ADDR
+Architectures: x86
+Type: vm ioctl
+Parameters: unsigned long identity (in)
+Returns: 0 on success, -1 on error
+
+This ioctl defines the physical address of a one-page region in the guest
+physical address space. The region must be within the first 4GB of the
+guest physical address space and must not conflict with any memory slot
+or any mmio address. The guest may malfunction if it accesses this memory
+region.
+
+This ioctl is required on Intel-based hosts. This is needed on Intel hardware
+because of a quirk in the virtualization implementation (see the internals
+documentation when it pops into existence).
+
5. The kvm_run structure
Application code obtains a pointer to the kvm_run structure by

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