Re: [Xen-devel] [V0 PATCH 1/6] AMD-PVH: construct vmcb changes

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Mon, 18 Aug 2014 11:10:54 +0200
Roger Pau Monnà <roger.pau@xxxxxxxxxx> wrote:

> On 16/08/14 03:53, Mukesh Rathor wrote:
> > PVH guest starts in Long 64bit paging mode. This patch modifies
> > construct_vmcb for that.
> > 
> > Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
> > ---
> >  xen/arch/x86/hvm/svm/vmcb.c | 18 +++++++++++++++---
> >  1 file changed, 15 insertions(+), 3 deletions(-)
> > 
> > diff --git a/xen/arch/x86/hvm/svm/vmcb.c
> > b/xen/arch/x86/hvm/svm/vmcb.c index 21292bb..5df5f36 100644
> > --- a/xen/arch/x86/hvm/svm/vmcb.c
> > +++ b/xen/arch/x86/hvm/svm/vmcb.c
> > @@ -138,6 +138,8 @@ static int construct_vmcb(struct vcpu *v)
> >  
> >      /* Guest EFER. */
> >      v->arch.hvm_vcpu.guest_efer = 0;
> > +    if ( is_pvh_vcpu(v) )
> > +        v->arch.hvm_vcpu.guest_efer |= EFER_LMA;   /* PVH
> > 32bitfixme */ hvm_update_guest_efer(v);
....
> 
> 
> I know this is already done on Intel in order to boot PVH guests, but
> now that we know what we need to modify in both Intel and AMD HVM
> code, do you think it would we suitable to add another parameter to
> vcpu_initialise in order to tell it to setup the vcpu to boot into
> long (or protected if we support 32bit PVH guests) mode (and prevent
> adding more is_pvh_vcpu)?

Well, we can defer adding parameter to vcpu_initialise to when 32bit
work gets done. For now, we could move common hvm fields initialization 
to hvm_vcpu_initialise.. that way, we'd have fewer is_pvh. I can
submit a patch if Jan is ok with that.

Mukesh


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