Re: [Xen-devel] [PATCH 02/12] early PV on HVM

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

> +static uint32_t xen_cpuid_base(void)
> +{
> +     uint32_t base, eax, ebx, ecx, edx;
> +     char signature[13];
> +
> +     for (base = 0x40000000; base < 0x40010000; base += 0x100) {
> +             cpuid(base, &eax, &ebx, &ecx, &edx);
> +             *(uint32_t*)(signature + 0) = ebx;
> +             *(uint32_t*)(signature + 4) = ecx;
> +             *(uint32_t*)(signature + 8) = edx;
> +             signature[12] = 0;
> +
> +             if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2))
> +                     return base;
> +     }
> +
> +     return 0;
> +}

I forgot to mention this in the previous e-mail, but if you are rebasing
this against 2.6.34 it might be worth taking a look at the Microsoft HyperV 
code.
It also utilizes the cpuid code and this code could be made more generic.

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