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Re: [Xen-devel] auto_translated_physmap in Fedora

To: Pete Zaitcev <zaitcev@xxxxxxxxxx>
Subject: Re: [Xen-devel] auto_translated_physmap in Fedora
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: 2006年7月10日 12:44:24 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, quintela@xxxxxxxxxx
Delivery-date: 2006年7月10日 04:44:57 -0700
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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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