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authorAlexander Graf <agraf@suse.de>2010-07-29 14:48:08 +0200
committerAvi Kivity <avi@redhat.com>2010-10-24 10:50:57 +0200
commit15711e9c927bfc08e66791cbf0ca7887c0880768 (patch)
tree0b44274b4592b298177122178e83927d45919a19 /Documentation/kvm
parentd7d3c2ea99c4845611997cf728af88c4c232e908 (diff)
KVM: PPC: Add get_pvinfo interface to query hypercall instructions
We need to tell the guest the opcodes that make up a hypercall through interfaces that are controlled by userspace. So we need to add a call for userspace to allow it to query those opcodes so it can pass them on. This is required because the hypercall opcodes can change based on the hypervisor conditions. If we're running in hardware accelerated hypervisor mode, a hypercall looks different from when we're running without hardware acceleration. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'Documentation/kvm')
-rw-r--r--Documentation/kvm/api.txt23
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt
index 5f5b64982b1a..44d9893f9db1 100644
--- a/Documentation/kvm/api.txt
+++ b/Documentation/kvm/api.txt
@@ -1032,6 +1032,29 @@ are defined as follows:
eax, ebx, ecx, edx: the values returned by the cpuid instruction for
this function/index combination
+4.46 KVM_PPC_GET_PVINFO
+
+Capability: KVM_CAP_PPC_GET_PVINFO
+Architectures: ppc
+Type: vm ioctl
+Parameters: struct kvm_ppc_pvinfo (out)
+Returns: 0 on success, !0 on error
+
+struct kvm_ppc_pvinfo {
+ __u32 flags;
+ __u32 hcall[4];
+ __u8 pad[108];
+};
+
+This ioctl fetches PV specific information that need to be passed to the guest
+using the device tree or other means from vm context.
+
+For now the only implemented piece of information distributed here is an array
+of 4 instructions that make up a hypercall.
+
+If any additional field gets added to this structure later on, a bit for that
+additional piece of information will be set in the flags bitmap.
+
5. The kvm_run structure
Application code obtains a pointer to the kvm_run structure by