Re: [Xen-devel] [PATCH v6 7/8] x86/hvm: Introduce viridian_save_vcpu_ctxt_one() func

[Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>]

On Mi, 2018-06-06 at 12:33 +0000, Paul Durrant wrote:
> > 
> > -----Original Message-----
> > From: Alexandru Isaila [mailto:aisaila@xxxxxxxxxxxxxxx]
> > Sent: 06 June 2018 13:25
> > To: xen-devel@xxxxxxxxxxxxx
> > Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxx>; Wei Liu <wei.liu2@citrix.
> > com>;
> > jbeulich@xxxxxxxx; Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>; Paul
> > Durrant <Paul.Durrant@xxxxxxxxxx>; Alexandru Isaila
> > <aisaila@xxxxxxxxxxxxxxx>
> > Subject: [PATCH v6 7/8] x86/hvm: Introduce
> > viridian_save_vcpu_ctxt_one()
> > func
> > 
> > This is used to save data from a single instance.
> > 
> > Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
> > 
> > ---
> > Changes since V5:
> >     - Add memset to 0 for ctxt->_pad
> > ---
> >  xen/arch/x86/hvm/viridian.c | 14 ++++++++++----
> >  1 file changed, 10 insertions(+), 4 deletions(-)
> > 
> > diff --git a/xen/arch/x86/hvm/viridian.c
> > b/xen/arch/x86/hvm/viridian.c
> > index 694eae6..9be5ed2 100644
> > --- a/xen/arch/x86/hvm/viridian.c
> > +++ b/xen/arch/x86/hvm/viridian.c
> > @@ -1026,6 +1026,13 @@ static int viridian_load_domain_ctxt(struct
> > domain
> > *d, hvm_domain_context_t *h)
> >  HVM_REGISTER_SAVE_RESTORE(VIRIDIAN_DOMAIN,
> > viridian_save_domain_ctxt,
> >                            viridian_load_domain_ctxt, 1,
> > HVMSR_PER_DOM);
> > 
> > +static void viridian_save_vcpu_ctxt_one(struct vcpu *v, struct
> > hvm_viridian_vcpu_context *ctxt)
> > +{
> > +    ctxt->vp_assist_msr = v-
> > >arch.hvm_vcpu.viridian.vp_assist.msr.raw;
> > +    ctxt->vp_assist_pending = v-
> > >arch.hvm_vcpu.viridian.vp_assist.pending;
> > +    memset(ctxt->_pad, 0, sizeof(ctxt->_pad));
> Sorry, this is not what I meant. What I meant was:
> 
> memset(ctx, 0, sizeof(*ctx));
> ctxt->vp_assist_msr = v->arch.hvm_vcpu.viridian.vp_assist.msr.raw;
> ctxt->vp_assist_pending = v-
> >arch.hvm_vcpu.viridian.vp_assist.pending;
> 
Sorry for the misunderstanding, I'll fix it on the next version

Alex 
> 
> > 
> > +}
> > +
> >  static int viridian_save_vcpu_ctxt(struct domain *d,
> > hvm_domain_context_t
> > *h)
> >  {
> >      struct vcpu *v;
> > @@ -1034,10 +1041,9 @@ static int viridian_save_vcpu_ctxt(struct
> > domain
> > *d, hvm_domain_context_t *h)
> >          return 0;
> > 
> >      for_each_vcpu( d, v ) {
> > -        struct hvm_viridian_vcpu_context ctxt = {
> > -            .vp_assist_msr = v-
> > >arch.hvm_vcpu.viridian.vp_assist.msr.raw,
> > -            .vp_assist_pending = v-
> > >arch.hvm_vcpu.viridian.vp_assist.pending,
> > -        };
> > +        struct hvm_viridian_vcpu_context ctxt;
> > +
> > +        viridian_save_vcpu_ctxt_one(v, &ctxt);
> > 
> >          if ( hvm_save_entry(VIRIDIAN_VCPU, v->vcpu_id, h, &ctxt)
> > != 0 )
> >              return 1;
> > --
> > 2.7.4
> 
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