Re: [Xen-devel] [PATCH v10 09/20] x86/VPMU: Add public xenpmu.h

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 09/10/2014 10:45 AM, Jan Beulich wrote:
> > > > On 04.09.14 at 05:41, <boris.ostrovsky@xxxxxxxxxx> wrote:
> > +struct xen_pmu_arch {
> > +    union {
> > +        struct cpu_user_regs regs;
> > +        uint8_t pad[256];
> > +    } r;
> Can you remind me again what you need the union and padding for
> here?
This structure is laid out in a shared page with a (possibly 32-bit) 
guest who need to access fields that follow this union.
-boris

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