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authorMukesh Rathor <mukesh.rathor@oracle.com>2013-12-13 12:39:56 -0500
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-01-06 10:43:58 -0500
commitddc416cbc4e34f52bebca027de1c099bd30795f8 (patch)
treeaabb038f3452d9d0d7ae24a58b40267823e74dd6 /arch/x86/xen
parentfc590efe667338f7da250cf2d2eb6fdd486e1b97 (diff)
downloadop-kernel-dev-ddc416cbc4e34f52bebca027de1c099bd30795f8.zip
op-kernel-dev-ddc416cbc4e34f52bebca027de1c099bd30795f8.tar.gz
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 'arch/x86/xen')
-rw-r--r--arch/x86/xen/Kconfig5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 1a3c765..e7d0590 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -51,3 +51,8 @@ config XEN_DEBUG_FS
Enable statistics output and various tuning options in debugfs.
Enabling this option may incur a significant performance overhead.
+config XEN_PVH
+ bool "Support for running as a PVH guest"
+ depends on X86_64 && XEN && BROKEN
+ select XEN_PVHVM
+ def_bool n
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