Re: [Xen-devel] [PATCH 01/13] Nested Virtualization: tools

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On Tuesday 16 November 2010 12:37:06 Tim Deegan wrote:
> Hi,
>
> At 18:40 +0000 on 12 Nov (1289587225), Christoph Egger wrote:
> > +#define SVM_FEATURE_NPT            0x00000001
> > +#define SVM_FEATURE_LBRV           0x00000002
> > +#define SVM_FEATURE_SVML           0x00000004
> > +#define SVM_FEATURE_NRIPS          0x00000008
> > +#define SVM_FEATURE_PAUSEFILTER    0x00000400
> > +
> > +        /* Only passthrough SVM features which are implemented */
> > +        edx = 0;
> > +        if (regs[3] & SVM_FEATURE_NPT)
> > +            edx |= SVM_FEATURE_NPT;
> > +        if (regs[3] & SVM_FEATURE_LBRV)
> > +            edx |= SVM_FEATURE_LBRV;
> > +        if (regs[3] & SVM_FEATURE_NRIPS)
> > +            edx |= SVM_FEATURE_NRIPS;
> > +        if (regs[3] & SVM_FEATURE_PAUSEFILTER)
> > +            edx |= SVM_FEATURE_PAUSEFILTER;
> > +
> > +        regs[3] = edx;
>
> Minor niggle - why isn't this just a single &= operation?

The l1 guest shouldn't see upcoming svm features yet.
They will be added here when support for them is implemented.

Christoph


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