> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Tuesday, July 29, 2014 3:22 AM
> To: Bhushan Bharat-R65777
> Cc: agraf@xxxxxxx; kvm-ppc@xxxxxxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; Yoder Stuart-
> B08248
> Subject: Re: [PATCH 1/6] KVM: PPC: BOOKE: No need to set DBCR0_EDM in guest
> visible register
>
> On Fri, 2014-07-11 at 14:08 +0530, Bharat Bhushan wrote:
> > This is not used and even I do not remember why this was added in
> > first place.
> >
> > Signed-off-by: Bharat Bhushan <Bharat.Bhushan@xxxxxxxxxxxxx>
> > ---
> > arch/powerpc/kvm/booke.c | 2 --
> > 1 file changed, 2 deletions(-)
> >
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index
> > ab62109..a5ee42c 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -1804,8 +1804,6 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu
> *vcpu,
> > kvm_guest_protect_msr(vcpu, MSR_DE, true);
> > vcpu->guest_debug = dbg->control;
> > vcpu->arch.shadow_dbg_reg.dbcr0 = 0;
> > - /* Set DBCR0_EDM in guest visible DBCR0 register. */
> > - vcpu->arch.dbg_reg.dbcr0 = DBCR0_EDM;
> >
> > if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
> > vcpu->arch.shadow_dbg_reg.dbcr0 |= DBCR0_IDM | DBCR0_IC;
>
> This was intended to let the guest know that the host owns the debug resources,
> by analogy to what a JTAG debugger would do.
>
> The Power ISA has this "Virtualized Implementation Note":
>
> It is the responsibility of the hypervisor to ensure that
> DBCR0[EDM] is consistent with usage of DEP.
Ok, That means that if MSRP_DEP is set then set DBCR0_EDM and if MSRP_DEP is clear then clear DBCR0_EDM, right?
We need to implement above mentioned this.
Thanks
-Bharat
>
> -Scott
>
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