Re: [Xen-devel] auto_translated_physmap in Fedora

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 7 Jul 2006, at 03:07, Pete Zaitcev wrote:

> I noticed one curious thing while working on some issues with Fedora.
> At least in 2.6.17-1.2302_FC6xen, the following evaluates to false:
>
>         if (xen_feature(XENFEAT_auto_translated_physmap))
>                 return pfn;
>
> But the head-xen.S looks like this:
>
> .section __xen_guest
>         .ascii  "GUEST_OS=linux,GUEST_VER=2.6"
>         .ascii  ",XEN_VER=xen-3.0"
>         .ascii  ",VIRT_BASE=0x"; utoh __START_KERNEL_map
>         .ascii  ",HYPERCALL_PAGE=0x"; utoh (phys_hypercall_page >> 
> PAGE_SHIFT)
>         .ascii  ",FEATURES=writable_page_tables"
>         .ascii           "|writable_descriptor_tables"
>         .ascii           "|auto_translated_physmap"
>         .ascii           "|supervisor_mode_kernel"
>         .ascii  ",LOADER=generic"
>         .byte   0
>
> Everything continues to work just fine, thanks to runtime checks
> of xen_feature() like the above.
The header includes 'auto_translated_physmap' indicating that the guest 
can handle that feature, but does not require it to be enabled.
 -- Keir


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