> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Tuesday, January 03, 2012 2:23 AM
> To: Liu Yu-B13201
> Cc: agraf@xxxxxxx; kvm-ppc@xxxxxxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH 2/2] KVM: PPC: epapr: Install ev_idle hcall for
> paravirt guest linux
>
> 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().
>
Do you mean we scan and parse hypervisor node in early_init_devtree()?
Thanks,
Yu
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