[PATCH v12 02/18] xen/pvh/x86: Define what an PVH guest is (v2).
From: Konrad Rzeszutek Wilk
Date: Tue Dec 31 2013 - 23:38:28 EST
From: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
Which is a PV guest with auto page translation enabled
and with vector callback. It is a cross between PVHVM and PV.
The Xen side defines PVH as (from docs/misc/pvh-readme.txt,
"* the guest uses auto translate:
- p2m is managed by Xen
- pagetables are owned by the guest
- mmu_update hypercall not available
* it uses event callback and not vlapic emulation,
* IDT is native, so set_trap_table hcall is also N/A for a PVH guest.
For a full list of hcalls supported for PVH, see pvh_hypercall64_table
in arch/x86/hvm/hvm.c in xen. From the ABI prespective, it's mostly a
PV guest with auto translate, although it does use hvm_op for setting
We don't have yet a Kconfig entry setup as we do not
have all the parts ready for it - so we piggyback
on the PVHVM config option. This scaffolding will
be removed later.
Note that on ARM the concept of PVH is non-existent. As Ian
put it: "an ARM guest is neither PV nor HVM nor PVHVM.
It's a bit like PVH but is different also (it's further towards
the H end of the spectrum than even PVH).". As such these
options (PVHVM, PVH) are never enabled nor seen on ARM
Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
include/xen/xen.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/xen/xen.h b/include/xen/xen.h
index a74d436..c4ab644 100644
@@ -29,4 +29,20 @@ extern enum xen_domain_type xen_domain_type;
#define xen_initial_domain() (0)
#endif /* CONFIG_XEN_DOM0 */
+/* Temporarily under XEN_PVHVM, but will be under CONFIG_XEN_PVH */
+/* This functionality exists only for x86. The XEN_PVHVM support exists
+ * only in x86 world - hence on ARM it will be always disabled.
+ * N.B. ARM guests are neither PV nor HVM nor PVHVM.
+ * It's a bit like PVH but is different also (it's further towards the H
+ * end of the spectrum than even PVH).
+#define xen_pvh_domain() (xen_pv_domain() && \
+ xen_feature(XENFEAT_auto_translated_physmap) && \
+#define xen_pvh_domain() (0)
#endif /* _XEN_XEN_H */
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/