Re: [Xen-devel] [PATCH 2/6] vTPM: add HVM_PARAM_STUBDOM_VTPM parameter for HVM virtual machine

["Xu, Quan" <quan.xu@xxxxxxxxx>]

> -----Original Message-----
> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Thursday, October 30, 2014 7:50 PM
> To: Xu, Quan; xen-devel@xxxxxxxxxxxxx
> Cc: keir@xxxxxxx; ian.campbell@xxxxxxxxxx; tim@xxxxxxx;
> ian.jackson@xxxxxxxxxxxxx; jbeulich@xxxxxxxx
> Subject: Re: [Xen-devel] [PATCH 2/6] vTPM: add
> HVM_PARAM_STUBDOM_VTPM parameter for HVM virtual machine
> 
> On 30/10/14 07:38, Quan Xu wrote:
> > Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
> 
> What is the purpose of this parameter?  A patch like this is currently
> unacceptable, especially as the libxl hunk indicates that the parameter name
> does not match whatever information you are putting into it.
> 
Thanks for your suggestion. 
This parameter tell the Qemu whether to register Qemu vTPM frontend in 
xen_hvm_init().
Qemu will get the parameter value by xc_get_hvm_param(). How can I change it?


> > ---
> >  tools/libxl/libxl_dom.c         | 2 ++
> >  xen/arch/x86/hvm/hvm.c          | 3 +++
> >  xen/include/public/hvm/params.h | 1 +
> >  3 files changed, 6 insertions(+)
> >
> > diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c index
> > 74ea84b..a60e8c9 100644
> > --- a/tools/libxl/libxl_dom.c
> > +++ b/tools/libxl/libxl_dom.c
> > @@ -291,6 +291,8 @@ static void hvm_set_conf_params(xc_interface
> > *handle, uint32_t domid,  #if defined(__i386__) || defined(__x86_64__)
> >      xc_hvm_param_set(handle, domid, HVM_PARAM_HPET_ENABLED,
> >                      libxl_defbool_val(info->u.hvm.hpet));
> > +    xc_set_hvm_param(handle, domid, HVM_PARAM_STUBDOM_VTPM,
> > +                     info->num_vtpms);
> >  #endif
> >      xc_hvm_param_set(handle, domid, HVM_PARAM_TIMER_MODE,
> timer_mode(info));
> >      xc_hvm_param_set(handle, domid, HVM_PARAM_VPT_ALIGN, diff --git
> > a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c index
> > 78f519d..39e4c11 100644
> > --- a/xen/arch/x86/hvm/hvm.c
> > +++ b/xen/arch/x86/hvm/hvm.c
> > @@ -5696,6 +5696,9 @@ long do_hvm_op(unsigned long op,
> > XEN_GUEST_HANDLE_PARAM(void) arg)
> >
> >                  break;
> >              }
> > +            case HVM_PARAM_STUBDOM_VTPM:
> > +                rc = 0;
> > +                break;
> >              }
> >
> >              if ( rc == 0 )
> > diff --git a/xen/include/public/hvm/params.h
> > b/xen/include/public/hvm/params.h index 3c51072..333c131 100644
> > --- a/xen/include/public/hvm/params.h
> > +++ b/xen/include/public/hvm/params.h
> > @@ -56,6 +56,7 @@
> >
> >  #if defined(__i386__) || defined(__x86_64__)
> >
> > +#define HVM_PARAM_STUBDOM_VTPM 8
> 
> New params should be added to the end of the number range.  8 is not up for
> grabs.
> 
> ~Andrew
> 
> >  /*
> >   * Viridian enlightenments
> >   *


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