Re: [Xen-devel] [XTF PATCH 08/16] vvmx: test vmxon with invalidly wide VMXON region address

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

On 12/16/16 20:40 +0000, Andrew Cooper wrote:
> On 16/12/16 13:43, Haozhong Zhang wrote:
> > +static uint8_t get_cpu_paddr_bits(void)
> > +{
> > +    uint8_t paddr_bits = 36;
> > +    uint32_t eax;
> > +
> > +    eax = cpuid_eax(0x80000000);
> > +    if ( (eax >> 16) == 0x8000 && eax >= 0x80000008 )
> > +    {
> > +        eax = cpuid_eax(0x80000008);
> > +        paddr_bits = eax & 0xff;
> > +        if ( paddr_bits > 52 )
> > +            paddr_bits = 52;
> > +    }
> > +
> > +    return paddr_bits;
> This is useful core functionality (and I can't believe I haven't
> published a test which needs it yet).
>
> Please extend collect_cpuid() and make maxphysaddr and maxvirtaddr
> available globally along with the other vendor/family/feature
> information, although I'd drop the clipping at 52 bits.
Sure.

Haozhong

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