diff options
| author | Shivaprasad G Bhat <sbhat@linux.ibm.com> | 2020-02-09 22:56:42 -0600 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2020-02-21 09:15:04 +1100 |
| commit | b5fca656f7011ca56fdfa93160c4296db9e3f4d9 (patch) | |
| tree | 04e1e3562113f06733680b5d742065aff94d34a8 /include | |
| parent | ee3a71e36654317b14ede0290e87628f8b79f850 (diff) | |
spapr: Add Hcalls to support PAPR NVDIMM device
This patch implements few of the necessary hcalls for the nvdimm support.
PAPR semantics is such that each NVDIMM device is comprising of multiple
SCM(Storage Class Memory) blocks. The guest requests the hypervisor to
bind each of the SCM blocks of the NVDIMM device using hcalls. There can
be SCM block unbind requests in case of driver errors or unplug(not
supported now) use cases. The NVDIMM label read/writes are done through
hcalls.
Since each virtual NVDIMM device is divided into multiple SCM blocks,
the bind, unbind, and queries using hcalls on those blocks can come
independently. This doesn't fit well into the qemu device semantics,
where the map/unmap are done at the (whole)device/object level granularity.
The patch doesnt actually bind/unbind on hcalls but let it happen at the
device_add/del phase itself instead.
The guest kernel makes bind/unbind requests for the virtual NVDIMM device
at the region level granularity. Without interleaving, each virtual NVDIMM
device is presented as a separate guest physical address range. So, there
is no way a partial bind/unbind request can come for the vNVDIMM in a
hcall for a subset of SCM blocks of a virtual NVDIMM. Hence it is safe to
do bind/unbind everything during the device_add/del.
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Message-Id: <158131059899.2897.11515211602702956854.stgit@lep8c.aus.stglabs.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/ppc/spapr.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index a1fba95c82..d557fc1f35 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -300,6 +300,7 @@ struct SpaprMachineState { #define H_P7 -60 #define H_P8 -61 #define H_P9 -62 +#define H_OVERLAP -68 #define H_UNSUPPORTED_FLAG -256 #define H_MULTI_THREADS_ACTIVE -9005 @@ -507,8 +508,13 @@ struct SpaprMachineState { #define H_INT_ESB 0x3C8 #define H_INT_SYNC 0x3CC #define H_INT_RESET 0x3D0 +#define H_SCM_READ_METADATA 0x3E4 +#define H_SCM_WRITE_METADATA 0x3E8 +#define H_SCM_BIND_MEM 0x3EC +#define H_SCM_UNBIND_MEM 0x3F0 +#define H_SCM_UNBIND_ALL 0x3FC -#define MAX_HCALL_OPCODE H_INT_RESET +#define MAX_HCALL_OPCODE H_SCM_UNBIND_ALL /* The hcalls above are standardized in PAPR and implemented by pHyp * as well. |