Re: [Xen-devel] [PATCH] Don't clear HCR_VM bit when updating VTTBR.

[Steve Capper <steve.capper@xxxxxxxxxx>]

On Wed, Oct 19, 2016 at 12:59:45PM -0700, Stefano Stabellini wrote:
> On Mon, 10 Oct 2016, Jun Sun wrote:
> > Currently function p2m_restore_state() would clear HCR_VM bit, i.e.,
> > disabling stage2 translation, before updating VTTBR register. After
> > some research and talking to ARM support, I got confirmed that this is not
> > necessary. We are currently working on a new platform that would need this
> > to be removed.
> > 
> > The patch is tested on FVP foundation model.
> > 
> > Signed-off-by: Jun Sun <jsun@xxxxxxxxxx>
> 
> Hello Jun,
> 
> thanks for the patch and sorry for the late reply. I would appreciate
> feedback from Julien, but he is current AFK.
> 
> Steve,
> can I have your Acked-by on this patch?
> 

Apologies for my very late reply on this.

I've taken a look and I think that this is okay, so please feel free to
add:
Acked-by: Steve Capper <steve.capper@xxxxxxxxxx>

Cheers,
-- 
Steve

> 
> >  xen/arch/arm/p2m.c | 2 --
> >  1 file changed, 2 deletions(-)
> > 
> > diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
> > index cc5634b..e4991df 100644
> > --- a/xen/arch/arm/p2m.c
> > +++ b/xen/arch/arm/p2m.c
> > @@ -140,8 +140,6 @@ void p2m_restore_state(struct vcpu *n)
> >          return;
> >  
> >      hcr = READ_SYSREG(HCR_EL2);
> > -    WRITE_SYSREG(hcr & ~HCR_VM, HCR_EL2);
> > -    isb();
> >  
> >      WRITE_SYSREG64(p2m->vttbr, VTTBR_EL2);
> >      isb();
> > -- 
> > 2.7.4
> > 

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