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authorMukesh Rathor <mukesh.rathor@oracle.com>2013-12-13 21:39:56 +0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-01-06 19:43:58 +0400
commitddc416cbc4e34f52bebca027de1c099bd30795f8 (patch)
treeaabb038f3452d9d0d7ae24a58b40267823e74dd6 /include
parentfc590efe667338f7da250cf2d2eb6fdd486e1b97 (diff)
downloadlinux-ddc416cbc4e34f52bebca027de1c099bd30795f8.tar.xz
xen/pvh/x86: Define what an PVH guest is (v3).
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." Also we use the PV cpuid, albeit we can use the HVM (native) cpuid. However, we do have a fair bit of filtering in the xen_cpuid and we can piggyback on that until the hypervisor/toolstack filters the appropiate cpuids. Once that is done we can swap over to use the native one. We setup a Kconfig entry that is disabled by default and cannot be enabled. 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 compilations. Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'include')
-rw-r--r--include/xen/xen.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/xen/xen.h b/include/xen/xen.h
index a74d4362c4f8..0c0e3ef4c45d 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -29,4 +29,18 @@ extern enum xen_domain_type xen_domain_type;
#define xen_initial_domain() (0)
#endif /* CONFIG_XEN_DOM0 */
+#ifdef 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).
+ */
+#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 */