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[Xen-devel] [RFC XEN PATCH v3 38/39] tools/libxl: initiate PMEM mapping via QMP callback



The base guest physical address of each vNVDIMM device is decided by
QEMU. Add a QMP callback to get the base address from QEMU and query Xen
hypervisor to map host PMEM pages to that address.

Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl_qmp.c     | 130 ++++++++++++++++++++++++++++++++++++++++++++
 tools/libxl/libxl_vnvdimm.c |  30 ++++++++++
 tools/libxl/libxl_vnvdimm.h |  30 ++++++++++
 3 files changed, 190 insertions(+)
 create mode 100644 tools/libxl/libxl_vnvdimm.h

diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c
index e1eb47c1d2..299f9c8260 100644
--- a/tools/libxl/libxl_qmp.c
+++ b/tools/libxl/libxl_qmp.c
@@ -26,6 +26,7 @@
 
 #include "_libxl_list.h"
 #include "libxl_internal.h"
+#include "libxl_vnvdimm.h"
 
 /* #define DEBUG_RECEIVED */
 
@@ -1170,6 +1171,127 @@ int libxl_qemu_monitor_command(libxl_ctx *ctx, uint32_t 
domid,
     return rc;
 }
 
+#if defined(__linux__)
+
+static int qmp_register_vnvdimm_callback(libxl__qmp_handler *qmp,
+                                         const libxl__json_object *o,
+                                         void *arg)
+{
+    GC_INIT(qmp->ctx);
+    const libxl_domain_config *guest_config = arg;
+    const libxl_device_vnvdimm *vnvdimm;
+    const libxl__json_object *obj, *sub_map, *sub_obj;
+    const char *id, *expected_id;
+    unsigned int i, slot;
+    unsigned long gpa, size, mfn, gpfn, nr_pages;
+    int rc = 0;
+
+    for (i = 0; (obj = libxl__json_array_get(o, i)); i++) {
+        if (!libxl__json_object_is_map(obj))
+            continue;
+
+        sub_map = libxl__json_map_get("data", obj, JSON_MAP);
+        if (!sub_map)
+            continue;
+
+        sub_obj = libxl__json_map_get("slot", sub_map, JSON_INTEGER);
+        slot = libxl__json_object_get_integer(sub_obj);
+        if (slot > guest_config->num_vnvdimms) {
+            LOG(ERROR,
+                "Invalid QEMU memory device slot %u, expecting less than %u",
+                slot, guest_config->num_vnvdimms);
+            rc = -ERROR_INVAL;
+            goto out;
+        }
+        vnvdimm = &guest_config->vnvdimms[slot];
+
+        /*
+         * Double check whether it's a NVDIMM memory device, through
+         * all memory devices in QEMU on Xen are for vNVDIMM.
+         */
+        expected_id = libxl__sprintf(gc, "xen_nvdimm%u", slot + 1);
+        if (!expected_id) {
+            LOG(ERROR, "Cannot build device id");
+            rc = -ERROR_FAIL;
+            goto out;
+        }
+        sub_obj = libxl__json_map_get("id", sub_map, JSON_STRING);
+        id = libxl__json_object_get_string(sub_obj);
+        if (!id || strncmp(id, expected_id, strlen(expected_id))) {
+            LOG(ERROR,
+                "Invalid QEMU memory device id %s, expecting %s",
+                id, expected_id);
+            rc = -ERROR_FAIL;
+            goto out;
+        }
+
+        sub_obj = libxl__json_map_get("addr", sub_map, JSON_INTEGER);
+        gpa = libxl__json_object_get_integer(sub_obj);
+        sub_obj = libxl__json_map_get("size", sub_map, JSON_INTEGER);
+        size = libxl__json_object_get_integer(sub_obj);
+        if ((gpa | size) & ~XC_PAGE_MASK) {
+            LOG(ERROR,
+                "Invalid address 0x%lx or size 0x%lx of QEMU memory device %s, 
"
+                "not aligned to 0x%lx",
+                gpa, size, id, XC_PAGE_SIZE);
+            rc = -ERROR_INVAL;
+            goto out;
+        }
+        gpfn = gpa >> XC_PAGE_SHIFT;
+
+        nr_pages = size >> XC_PAGE_SHIFT;
+        if (nr_pages > vnvdimm->nr_pages) {
+            LOG(ERROR,
+                "Invalid size 0x%lx of QEMU memory device %s, "
+                "expecting no larger than 0x%lx",
+                size, id, vnvdimm->nr_pages << XC_PAGE_SHIFT);
+            rc = -ERROR_INVAL;
+            goto out;
+        }
+
+        switch (vnvdimm->backend_type) {
+        case LIBXL_VNVDIMM_BACKEND_TYPE_MFN:
+            mfn = vnvdimm->u.mfn;
+            break;
+
+        default:
+            LOG(ERROR, "Invalid NVDIMM backend type %u", 
vnvdimm->backend_type);
+            rc = -ERROR_INVAL;
+            goto out;
+        }
+
+        rc = libxl_vnvdimm_add_pages(gc, qmp->domid, mfn, gpfn, nr_pages);
+        if (rc) {
+            LOG(ERROR,
+                "Cannot map PMEM pages for QEMU memory device %s, "
+                "mfn 0x%lx, gpfn 0x%lx, nr 0x%lx, rc %d",
+                id, mfn, gpfn, nr_pages, rc);
+            rc = -ERROR_FAIL;
+            goto out;
+        }
+    }
+
+ out:
+    GC_FREE;
+    return rc;
+}
+
+static int libxl__qmp_query_vnvdimms(libxl__qmp_handler *qmp,
+                                     const libxl_domain_config *guest_config)
+{
+    int rc;
+    GC_INIT(qmp->ctx);
+
+    rc = qmp_synchronous_send(qmp, "query-memory-devices", NULL,
+                              qmp_register_vnvdimm_callback,
+                              (void *)guest_config, qmp->timeout);
+
+    GC_FREE;
+    return rc;
+}
+
+#endif /* __linux__ */
+
 int libxl__qmp_initializations(libxl__gc *gc, uint32_t domid,
                                const libxl_domain_config *guest_config)
 {
@@ -1189,6 +1311,14 @@ int libxl__qmp_initializations(libxl__gc *gc, uint32_t 
domid,
     if (!ret) {
         ret = qmp_query_vnc(qmp);
     }
+
+#if defined(__linux__)
+    if (!ret && guest_config->num_vnvdimms) {
+        ignore_error = false;
+        ret = libxl__qmp_query_vnvdimms(qmp, guest_config);
+    }
+#endif /* __linux__ */
+
     libxl__qmp_close(qmp);
 
  out:
diff --git a/tools/libxl/libxl_vnvdimm.c b/tools/libxl/libxl_vnvdimm.c
index 4de8f04303..ff786d4177 100644
--- a/tools/libxl/libxl_vnvdimm.c
+++ b/tools/libxl/libxl_vnvdimm.c
@@ -19,6 +19,7 @@
 #include <xenctrl.h>
 
 #include "libxl_internal.h"
+#include "libxl_vnvdimm.h"
 
 int libxl_vnvdimm_copy_config(libxl_ctx *ctx,
                               libxl_domain_config *dst,
@@ -47,3 +48,32 @@ int libxl_vnvdimm_copy_config(libxl_ctx *ctx,
     GC_FREE;
     return rc;
 }
+
+#if defined(__linux__)
+
+int libxl_vnvdimm_add_pages(libxl__gc *gc, uint32_t domid,
+                            xen_pfn_t mfn, xen_pfn_t gpfn, xen_pfn_t nr_pages)
+{
+    unsigned int nr;
+    int ret;
+
+    while (nr_pages) {
+        nr = min(nr_pages, (unsigned long)UINT_MAX);
+
+        ret = xc_domain_populate_pmem_map(CTX->xch, domid, mfn, gpfn, nr);
+        if (ret && ret != -ERESTART) {
+            LOG(ERROR, "failed to map PMEM pages, mfn 0x%" PRI_xen_pfn ", "
+                "gpfn 0x%" PRI_xen_pfn ", nr_pages %u, err %d",
+                mfn, gpfn, nr, ret);
+            break;
+        }
+
+        nr_pages -= nr;
+        mfn += nr;
+        gpfn += nr;
+    }
+
+    return ret;
+}
+
+#endif /* __linux__ */
diff --git a/tools/libxl/libxl_vnvdimm.h b/tools/libxl/libxl_vnvdimm.h
new file mode 100644
index 0000000000..ec63c95088
--- /dev/null
+++ b/tools/libxl/libxl_vnvdimm.h
@@ -0,0 +1,30 @@
+/*
+ * tools/libxl/libxl_vnvdimm.h
+ *
+ * Copyright (C) 2017,  Intel Corporation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License, version 2.1, as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIBXL_VNVDIMM_H
+#define LIBXL_VNVDIMM_H
+
+#include <stdint.h>
+#include "libxl_internal.h"
+
+#if defined(__linux__)
+int libxl_vnvdimm_add_pages(libxl__gc *gc, uint32_t domid,
+                            xen_pfn_t mfn, xen_pfn_t gpfn, xen_pfn_t nr_pages);
+#endif /* __linux__ */
+
+#endif /* !LIBXL_VNVDIMM_H */
-- 
2.14.1


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