On 03.07.2013, at 21:29, Yoder Stuart-B08248 wrote:
> 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.
This still says Power :(. It's either POWER or PowerPC. There is no "Power"
platform :). As mentioned before, I think "PowerPC" is good enough to cover
everything.
The rest looks great.
Alex
> 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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