Re: [PATCH 7/8] viridian: define type for the 'virtual VP assist page'

[Paul Durrant <Paul.Durrant@citrix.com>]

> -----Original Message-----
> From: Roger Pau Monne
> Sent: 30 October 2018 17:09
> To: Paul Durrant <Paul.Durrant@citrix.com>
> Cc: xen-devel@lists.xenproject.org; Andrew Cooper
> <Andrew.Cooper3@citrix.com>; Wei Liu <wei.liu2@citrix.com>; Jan Beulich
> <jbeulich@suse.com>
> Subject: Re: [Xen-devel] [PATCH 7/8] viridian: define type for the
> 'virtual VP assist page'
> 
> On Mon, Oct 29, 2018 at 06:02:10PM +0000, Paul Durrant wrote:
> > The specification [1] defines a type so we should use it, rather than
> just
> > OR-ing and AND-ing magic bits.
> >
> > No functional change.
> >
> > NOTE: The type defined in the specification does include an anonymous
> >       sub-struct in the page type but, as we currently use only the
> first
> >       element, the struct declaration has been omitted.
> >
> > [1] https://github.com/MicrosoftDocs/Virtualization-
> Documentation/raw/live/tlfs/Hypervisor%20Top%20Level%20Functional%20Specif
> ication%20v5.0C.pdf
> >
> > Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> > ---
> > Cc: Jan Beulich <jbeulich@suse.com>
> > Cc: Andrew Cooper <andrew.cooper3@citrix.com>
> > Cc: Wei Liu <wei.liu2@citrix.com>
> > ---
> >  xen/arch/x86/hvm/viridian/synic.c  | 52 +++++++++++++++++++++++--------
> -------
> >  xen/include/asm-x86/hvm/viridian.h |  2 +-
> >  2 files changed, 33 insertions(+), 21 deletions(-)
> >
> > diff --git a/xen/arch/x86/hvm/viridian/synic.c
> b/xen/arch/x86/hvm/viridian/synic.c
> > index 3f043f34ee..735c4c897c 100644
> > --- a/xen/arch/x86/hvm/viridian/synic.c
> > +++ b/xen/arch/x86/hvm/viridian/synic.c
> > @@ -13,6 +13,18 @@
> >  #include <asm/apic.h>
> >  #include <asm/hvm/support.h>
> >
> > +typedef struct _HV_VIRTUAL_APIC_ASSIST
> > +{
> > +    uint32_t no_eoi:1;
> 
> Maybe bool:1 so you can use true/false?
> 

No, I'm very specifically using a 32-bit bitfield to match what the spec. says.

  Paul

> Thanks, Roger.

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