[PATCH v11 02/12] xen/pvh: Define what an PVH guest is.

From: Konrad Rzeszutek Wilk
Date: Tue Dec 17 2013 - 15:52:03 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,
with modifications):

"* 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
callback vector."

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.

Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
include/xen/xen.h | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/include/xen/xen.h b/include/xen/xen.h
index a74d436..1d6a237 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -29,4 +29,13 @@ extern enum xen_domain_type xen_domain_type;
#define xen_initial_domain() (0)
#endif /* CONFIG_XEN_DOM0 */

+#ifdef CONFIG_XEN_PVHVM
+/* Temporarily under XEN_PVHVM, but will be under CONFIG_XEN_PVH */
+#include <xen/features.h>
+#define xen_pvh_domain() (xen_pv_domain() && \
+ xen_feature(XENFEAT_auto_translated_physmap) && \
+ xen_have_vector_callback)
+#else
+#define xen_pvh_domain() (0)
+#endif
#endif /* _XEN_XEN_H */
--
1.8.3.1

--
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/