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    SubjectRe: [Xen-devel] [PATCH 02/12] early PV on HVM
    On Fri, 4 Jun 2010, Konrad Rzeszutek Wilk wrote:
    > > +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.
    >

    these patches are already based on 2.6.34, I didn't use the generic
    hypervisor setup code because it is not available in 2.6.34, however
    in the future rebasing to use that is going to be quite easy.



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