Re: [PATCH] x86/xen: Initialize cr4 shadow for 64-bit PV(H) guests

[Boris Ostrovsky]

On 02/23/2015 11:09 AM, Andy Lutomirski wrote:
> On Mon, Feb 23, 2015 at 8:01 AM, Boris Ostrovsky
> <boris.ostrovsky@xxxxxxxxxx> wrote:
> > Commit 1e02ce4cccdc ("x86: Store a per-cpu shadow copy of CR4")
> > introduced CR4 shadows.
> >
> > These shadows are initialized in early boot code. The commit missed
> > initialization for 64-bit PV(H) guests that this patch adds.
> Whoops, worry.
>
> This is needed for 3.21, right?

It would have been 3.20, I think. Which is now 4.0.


-boris

> --Andy
>
> > Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> > ---
> >   arch/x86/xen/enlighten.c |    1 +
> >   1 files changed, 1 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> > index bd8b845..7393f3e 100644
> > --- a/arch/x86/xen/enlighten.c
> > +++ b/arch/x86/xen/enlighten.c
> > @@ -1741,6 +1741,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
> >   #ifdef CONFIG_X86_32
> >          i386_start_kernel();
> >   #else
> > +       cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
> >          x86_64_start_reservations((char *)__pa_symbol(&boot_params));
> >   #endif
> >   }
> > --
> > 1.7.1

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