Re: [Xen-ia64-devel] [RFC][PATCH] support special domU optimisation's in the hypervisor

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>]

Am Mittwoch, 27. Juni 2007 schrieb Dietmar Hahn:

> The next step is the patch for dom0/domU linux to switch this feature on.

I thought of the following interface in linux:

include/asm-ia64/hypercall.h:

static inline int
HYPERVISOR_opt_feature(int cmd, void *arg)
{
        struct xencomm_handle *new_arg;
        new_arg = xencomm_create_inline(arg);
        return _hypercall2(int, opt_feature, cmd, new_arg);
}

A function with the following code to set the feature:

        struct ia64_opt_feature optf;
        optf.cmd = IA64_OPT_FEATURE_IDENTITY_MAPPING;
        optf.on = IA64_OPT_FEATURE_ON;
        optf.pgprot = pgprot_val(PAGE_KERNEL);
        HYPERVISOR_opt_feature(IA64_OPT_FEATURE_IDENTITY_MAPPING, &optf);

Thanks.

Dietmar



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