Version 4 changes
-clarified that KVM zeros the upper half of the struct fields
if the VM is not in 64-bit mode
------------------------------------------------------------------------
KVM_CAP_EXIT_EPAPR_HCALL Capability
A new capability KVM_CAP_EXIT_EPAPR_HCALL is defined to advertise
the new KVM_EXIT_EPAPR_HCALL exit .
------------------------------------------------------------------------
KVM_EXIT_EPAPR_HCALL exit definition
/* KVM_EXIT_EPAPR_HCALL */
struct {
__u64 nr;
__u64 ret;
__u64 args[8];
} epapr_hcall;
This is used on Power/PowerPC platforms that support ePAPR hcalls.
It occurs when a guest does a hypercall (as defined
in the ePAPR 1.1) and the hcall is not handled by the kernel.
The 'nr' field contains the hypercall number (from the guest R11),
and 'args' contains the arguments (from the guest R3 - R10).
Userspace should put the return code in 'ret' and any extra returned
values in args[]. If the VM is not in 64-bit mode KVM zeros
the upper half of each field in the struct.
As per the ePAPR hcall ABI, the return value is returned to
the guest in R3 and output return values in R4 - R10.
------------------------------------------------------------------------
Advertising reset and shutdown in device tree.
A virtual machine can detect the availability of the reset
and shutdown hcalls by looking at properties on the /hypervisor
node in the device tree passed to the VM.
Property name: kvm,has-reset
Value type: <none>
Definition: If the property is present the hypervisor supports
the KVM_HC_VM_RESET hcall.
Property name: kvm,has-shutdown
Value type: <none>
Definition: If the property is present the hypervisor supports
the KVM_HC_VM_SHUTDOWN hcall.
------------------------------------------------------------------------
Hypercall: KVM_HC_VM_RESET
Description: Requests that the virtual machine be reset. The
hcall takes no arguments. If successful the hcall does not
return.
Arguments:
r11 hcall-token KVM_HC_VM_RESET
Return values
r3 status Status of the hcall. If the hcall succeeds
it does not return. If an error occurs
EV_INTERNAL is returned.
------------------------------------------------------------------------
Hypercall: KVM_HC_VM_SHUTDOWN
Description: Requests that the virtual machine be powered-off/halted.
The hcall takes no arguments. If successful the hcall does not
return.
Arguments:
r11 hcall-token KVM_HC_VM_SHUTDOWN
Return values
r3 status Status of the hcall. If the hcall succeeds
it does not return. If an error occurs
EV_INTERNAL is returned.
Regards,
Stuart
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