On 12/31/2011 12:16 AM, Liu Yu wrote:
> If the guest hypervisor node contains "has-idle" property.
>
> Signed-off-by: Liu Yu <yu.liu@xxxxxxxxxxxxx>
> ---
> arch/powerpc/kernel/kvm.c | 29 +++++++++++++++++++++++++++++
> 1 files changed, 29 insertions(+), 0 deletions(-)
>
> diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
> index b06bdae..258f129 100644
> --- a/arch/powerpc/kernel/kvm.c
> +++ b/arch/powerpc/kernel/kvm.c
> @@ -28,6 +28,7 @@
> #include <asm/sections.h>
> #include <asm/cacheflush.h>
> #include <asm/disassemble.h>
> +#include <asm/machdep.h>
>
> #define KVM_MAGIC_PAGE (-4096L)
> #define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x)
> @@ -571,6 +572,30 @@ static __init void kvm_free_tmp(void)
> }
> }
>
> +static void kvm_hcall_ev_idle(void)
> +{
> + ulong in[8];
> + ulong out[8];
> +
> + current_thread_info()->local_flags |= _TLF_NAPPING;
> + local_irq_enable();
> + kvm_hypercall(in, out, HC_VENDOR_EPAPR | HC_EV_IDLE);
> +}
I think this has to be done in assembly -- otherwise it's not safe for
the interrupt handler to return directly to LR.
> +static int kvm_para_ev_has_idle(void)
> +{
> + struct device_node *hyper_node;
> +
> + hyper_node = of_find_node_by_path("/hypervisor");
> + if (!hyper_node)
> + return 0;
> +
> + if (of_get_property(hyper_node, "has-idle", NULL))
> + return 1;
> +
> + return 0;
> +}
Since this is standardized in ePAPR, can we move it out of kvm.c an into
generic code to work with any hypervisor that sets has-idle? Likewise
with kvm_para_setup().
-Scott
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