From: Vaibhav Jain <vaibhav@linux.ibm.com>
To: qemu-devel@nongnu.org, kvm-ppc@vger.kernel.org,
qemu-ppc@nongnu.org, david@gibson.dropbear.id.au, mst@redhat.com,
imammedo@redhat.com, xiaoguangrong.eric@gmail.com
Cc: ehabkost@redhat.com, aneesh.kumar@linux.ibm.com, groug@kaod.org,
shivaprasadbhat@gmail.com, bharata@linux.vnet.ibm.com,
Vaibhav Jain <vaibhav@linux.ibm.com>
Subject: [PATCH v2] ppc/spapr: Add support for implement support for H_SCM_HEALTH
Date: Thu, 1 Apr 2021 06:35:19 +0530 [thread overview]
Message-ID: <20210401010519.7225-1-vaibhav@linux.ibm.com> (raw)
Add support for H_SCM_HEALTH hcall described at [1] for spapr
nvdimms. This enables guest to detect the 'unarmed' status of a
specific spapr nvdimm identified by its DRC and if its unarmed, mark
the region backed by the nvdimm as read-only.
The patch adds h_scm_health() to handle the H_SCM_HEALTH hcall which
returns two 64-bit bitmaps (health bitmap, health bitmap mask) derived
from 'struct nvdimm->unarmed' member.
Linux kernel side changes to enable handling of 'unarmed' nvdimms for
ppc64 are proposed at [2].
References:
[1] "Hypercall Op-codes (hcalls)"
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/powerpc/papr_hcalls.rst#n220
[2] "powerpc/papr_scm: Mark nvdimm as unarmed if needed during probe"
https://lore.kernel.org/linux-nvdimm/20210329113103.476760-1-vaibhav@linux.ibm.com/
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
Changelog
v2:
* Added a check for drc->dev to ensure that the dimm is plugged in
when servicing H_SCM_HEALTH. [ Shiva ]
* Instead of accessing the 'nvdimm->unarmed' member directly use the
object_property_get_bool accessor to fetch it. [ Shiva ]
* Update the usage of PAPR_PMEM_UNARMED* macros [ Greg ]
* Updated patch description reference#1 to point appropriate section
in the documentation. [ Greg ]
---
hw/ppc/spapr_nvdimm.c | 38 ++++++++++++++++++++++++++++++++++++++
include/hw/ppc/spapr.h | 3 ++-
2 files changed, 40 insertions(+), 1 deletion(-)
diff --git a/hw/ppc/spapr_nvdimm.c b/hw/ppc/spapr_nvdimm.c
index b46c36917c..34096e4718 100644
--- a/hw/ppc/spapr_nvdimm.c
+++ b/hw/ppc/spapr_nvdimm.c
@@ -31,6 +31,13 @@
#include "qemu/range.h"
#include "hw/ppc/spapr_numa.h"
+/* DIMM health bitmap bitmap indicators. Taken from kernel's papr_scm.c */
+/* SCM device is unable to persist memory contents */
+#define PAPR_PMEM_UNARMED (1ULL << (63 - 0))
+
+/* Bits status indicators for health bitmap indicating unarmed dimm */
+#define PAPR_PMEM_UNARMED_MASK (PAPR_PMEM_UNARMED)
+
bool spapr_nvdimm_validate(HotplugHandler *hotplug_dev, NVDIMMDevice *nvdimm,
uint64_t size, Error **errp)
{
@@ -467,6 +474,36 @@ static target_ulong h_scm_unbind_all(PowerPCCPU *cpu, SpaprMachineState *spapr,
return H_SUCCESS;
}
+static target_ulong h_scm_health(PowerPCCPU *cpu, SpaprMachineState *spapr,
+ target_ulong opcode, target_ulong *args)
+{
+ uint32_t drc_index = args[0];
+ SpaprDrc *drc = spapr_drc_by_index(drc_index);
+ NVDIMMDevice *nvdimm;
+
+ if (drc && spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PMEM) {
+ return H_PARAMETER;
+ }
+
+ /* Ensure that the dimm is plugged in */
+ if (!drc->dev) {
+ return H_HARDWARE;
+ }
+
+ nvdimm = NVDIMM(drc->dev);
+
+ args[0] = 0;
+ /* Check if the nvdimm is unarmed and send its status via health bitmaps */
+ if (object_property_get_bool(OBJECT(nvdimm), NVDIMM_UNARMED_PROP, NULL)) {
+ args[0] |= PAPR_PMEM_UNARMED;
+ }
+
+ /* Update the health bitmap with the applicable mask */
+ args[1] = PAPR_PMEM_UNARMED_MASK;
+
+ return H_SUCCESS;
+}
+
static void spapr_scm_register_types(void)
{
/* qemu/scm specific hcalls */
@@ -475,6 +512,7 @@ static void spapr_scm_register_types(void)
spapr_register_hypercall(H_SCM_BIND_MEM, h_scm_bind_mem);
spapr_register_hypercall(H_SCM_UNBIND_MEM, h_scm_unbind_mem);
spapr_register_hypercall(H_SCM_UNBIND_ALL, h_scm_unbind_all);
+ spapr_register_hypercall(H_SCM_HEALTH, h_scm_health);
}
type_init(spapr_scm_register_types)
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 47cebaf3ac..6e1eafb05d 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -538,8 +538,9 @@ struct SpaprMachineState {
#define H_SCM_BIND_MEM 0x3EC
#define H_SCM_UNBIND_MEM 0x3F0
#define H_SCM_UNBIND_ALL 0x3FC
+#define H_SCM_HEALTH 0x400
-#define MAX_HCALL_OPCODE H_SCM_UNBIND_ALL
+#define MAX_HCALL_OPCODE H_SCM_HEALTH
/* The hcalls above are standardized in PAPR and implemented by pHyp
* as well.
--
2.30.2
next reply other threads:[~2021-04-01 1:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 1:05 Vaibhav Jain [this message]
2021-04-01 2:26 ` [PATCH v2] ppc/spapr: Add support for implement support for H_SCM_HEALTH David Gibson
2021-04-01 5:51 ` Greg Kurz
2021-04-02 10:20 ` Vaibhav Jain
2021-04-02 10:07 ` Vaibhav Jain
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