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author | Mukesh Rathor <mukesh.rathor@oracle.com> | 2013-12-13 17:39:56 (GMT) |
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committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2014-01-06 15:43:58 (GMT) |
commit | ddc416cbc4e34f52bebca027de1c099bd30795f8 (patch) | |
tree | aabb038f3452d9d0d7ae24a58b40267823e74dd6 /include | |
parent | fc590efe667338f7da250cf2d2eb6fdd486e1b97 (diff) | |
download | linux-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.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/xen/xen.h b/include/xen/xen.h index a74d436..0c0e3ef 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 */ |