[PATCH 1/2] Add support for preallocated fd memory

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This first change introduces xml parsing support for preallocated
shared file descriptor based memory backing.
It allows vhost-user to be used without hugepages.

New xml elements:
<memoryBacking>
  <source type='file|anonymous'/>
  <access mode='shared|private'/>
  <allocation mode='immediate|ondemand'/>
</memoryBacking>
---
 docs/schemas/domaincommon.rng                      |  30 +++++
 src/conf/domain_conf.c                             | 138 ++++++++++++++++-----
 src/conf/domain_conf.h                             |  33 +++++
 .../qemuxml2xmlout-memorybacking-set.xml           |  40 ++++++
 .../qemuxml2xmlout-memorybacking-unset.xml         |  40 ++++++
 tests/qemuxml2xmltest.c                            |   3 +
 6 files changed, 251 insertions(+), 33 deletions(-)
 create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-memorybacking-set.xml
 create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-memorybacking-unset.xml

diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index dba9187..46d0be5 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -559,6 +559,36 @@
                 <empty/>
               </element>
             </optional>
+            <optional>
+              <element name="source">
+                <attribute name="type">
+                  <choice>
+                    <value>file</value>
+                    <value>anonymous</value>
+                  </choice>
+                </attribute>
+              </element>
+            </optional>
+            <optional>
+              <element name="access">
+                <attribute name="mode">
+                  <choice>
+                    <value>shared</value>
+                    <value>private</value>
+                  </choice>
+                </attribute>
+              </element>
+            </optional>
+            <optional>
+              <element name="allocation">
+                <attribute name="mode">
+                  <choice>
+                    <value>immediate</value>
+                    <value>ondemand</value>
+                  </choice>
+                </attribute>
+              </element>
+            </optional>
           </interleave>
         </element>
       </optional>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 03506cb..97ef769 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -830,6 +830,21 @@ VIR_ENUM_IMPL(virDomainDiskMirrorState, VIR_DOMAIN_DISK_MIRROR_STATE_LAST,
               "abort",
               "pivot")
 
+VIR_ENUM_IMPL(virDomainMemorySource, VIR_DOMAIN_MEMORY_SOURCE_LAST,
+              "none",
+              "file",
+              "anonymous")
+
+VIR_ENUM_IMPL(virDomainMemoryAccess, VIR_DOMAIN_MEMORY_ACCESS_LAST,
+              "none",
+              "shared",
+              "private")
+
+VIR_ENUM_IMPL(virDomainMemoryAllocation, VIR_DOMAIN_MEMORY_ALLOCATION_LAST,
+              "none",
+              "immediate",
+              "ondemand")
+
 VIR_ENUM_IMPL(virDomainLoader,
               VIR_DOMAIN_LOADER_TYPE_LAST,
               "rom",
@@ -16291,48 +16306,93 @@ virDomainDefParseXML(xmlDocPtr xml,
     }
     VIR_FREE(tmp);
 
-    if ((n = virXPathNodeSet("./memoryBacking/hugepages/page", ctxt, &nodes)) < 0) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                       _("cannot extract hugepages nodes"));
-        goto error;
+    tmp = virXPathString("string(./memoryBacking/source/@type)", ctxt);
+    if (tmp) {
+        if ((def->mem.source = virDomainMemorySourceTypeFromString(tmp)) < 0) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("unknown memoryBacking/source/type '%s'"), tmp);
+            goto error;
+        }
+        VIR_FREE(tmp);
     }
 
-    if (n) {
-        if (VIR_ALLOC_N(def->mem.hugepages, n) < 0)
+    tmp = virXPathString("string(./memoryBacking/access/@mode)", ctxt);
+    if (tmp) {
+        if ((def->mem.access = virDomainMemoryAccessTypeFromString(tmp)) < 0) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("unknown memoryBacking/access/mode '%s'"), tmp);
             goto error;
+        }
+        VIR_FREE(tmp);
+    }
 
-        for (i = 0; i < n; i++) {
-            if (virDomainHugepagesParseXML(nodes[i], ctxt,
-                                           &def->mem.hugepages[i]) < 0)
+    tmp = virXPathString("string(./memoryBacking/allocation/@mode)", ctxt);
+    if (tmp) {
+        if ((def->mem.allocation = virDomainMemoryAllocationTypeFromString(tmp)) < 0) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("unknown memoryBacking/allocation/mode '%s'"), tmp);
+            goto error;
+        }
+        VIR_FREE(tmp);
+    }
+
+    if (virXPathNode("./memoryBacking/hugepages", ctxt)) {
+        /* hugepages will be used */
+
+        if (def->mem.allocation == VIR_DOMAIN_MEMORY_ALLOCATION_ONDEMAND) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("hugepages are not allowed with memory allocation ondemand"));
+            goto error;
+        }
+
+        if (def->mem.source == VIR_DOMAIN_MEMORY_SOURCE_ANONYMOUS) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("hugepages are not allowed with anonymous memory source"));
+            goto error;
+        }
+
+        if ((n = virXPathNodeSet("./memoryBacking/hugepages/page", ctxt, &nodes)) < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("cannot extract hugepages nodes"));
+            goto error;
+        }
+
+        if (n) {
+            if (VIR_ALLOC_N(def->mem.hugepages, n) < 0)
                 goto error;
-            def->mem.nhugepages++;
 
-            for (j = 0; j < i; j++) {
-                if (def->mem.hugepages[i].nodemask &&
-                    def->mem.hugepages[j].nodemask &&
-                    virBitmapOverlaps(def->mem.hugepages[i].nodemask,
-                                      def->mem.hugepages[j].nodemask)) {
-                    virReportError(VIR_ERR_XML_DETAIL,
-                                   _("nodeset attribute of hugepages "
-                                     "of sizes %llu and %llu intersect"),
-                                   def->mem.hugepages[i].size,
-                                   def->mem.hugepages[j].size);
-                    goto error;
-                } else if (!def->mem.hugepages[i].nodemask &&
-                           !def->mem.hugepages[j].nodemask) {
-                    virReportError(VIR_ERR_XML_DETAIL,
-                                   _("two master hugepages detected: "
-                                     "%llu and %llu"),
-                                   def->mem.hugepages[i].size,
-                                   def->mem.hugepages[j].size);
+            for (i = 0; i < n; i++) {
+                if (virDomainHugepagesParseXML(nodes[i], ctxt,
+                                               &def->mem.hugepages[i]) < 0)
                     goto error;
+                def->mem.nhugepages++;
+
+                for (j = 0; j < i; j++) {
+                    if (def->mem.hugepages[i].nodemask &&
+                        def->mem.hugepages[j].nodemask &&
+                        virBitmapOverlaps(def->mem.hugepages[i].nodemask,
+                                          def->mem.hugepages[j].nodemask)) {
+                        virReportError(VIR_ERR_XML_DETAIL,
+                                       _("nodeset attribute of hugepages "
+                                         "of sizes %llu and %llu intersect"),
+                                       def->mem.hugepages[i].size,
+                                       def->mem.hugepages[j].size);
+                        goto error;
+                    } else if (!def->mem.hugepages[i].nodemask &&
+                               !def->mem.hugepages[j].nodemask) {
+                        virReportError(VIR_ERR_XML_DETAIL,
+                                       _("two master hugepages detected: "
+                                         "%llu and %llu"),
+                                       def->mem.hugepages[i].size,
+                                       def->mem.hugepages[j].size);
+                        goto error;
+                    }
                 }
             }
-        }
 
-        VIR_FREE(nodes);
-    } else {
-        if ((node = virXPathNode("./memoryBacking/hugepages", ctxt))) {
+            VIR_FREE(nodes);
+        } else {
+            /* no hugepage pages */
             if (VIR_ALLOC(def->mem.hugepages) < 0)
                 goto error;
 
@@ -23539,7 +23599,9 @@ virDomainDefFormatInternal(virDomainDefPtr def,
         virBufferAddLit(buf, "</memtune>\n");
     }
 
-    if (def->mem.nhugepages || def->mem.nosharepages || def->mem.locked) {
+    if (def->mem.nhugepages || def->mem.nosharepages || def->mem.locked
+        || def->mem.source || def->mem.access || def->mem.allocation)
+    {
         virBufferAddLit(buf, "<memoryBacking>\n");
         virBufferAdjustIndent(buf, 2);
         if (def->mem.nhugepages)
@@ -23548,6 +23610,16 @@ virDomainDefFormatInternal(virDomainDefPtr def,
             virBufferAddLit(buf, "<nosharepages/>\n");
         if (def->mem.locked)
             virBufferAddLit(buf, "<locked/>\n");
+        if (def->mem.source)
+            virBufferAsprintf(buf, "<source type='%s'/>\n",
+                virDomainMemorySourceTypeToString(def->mem.source));
+        if (def->mem.access)
+            virBufferAsprintf(buf, "<access mode='%s'/>\n",
+                virDomainMemoryAccessTypeToString(def->mem.access));
+        if (def->mem.allocation)
+            virBufferAsprintf(buf, "<allocation mode='%s'/>\n",
+                virDomainMemoryAllocationTypeToString(def->mem.allocation));
+
         virBufferAdjustIndent(buf, -2);
         virBufferAddLit(buf, "</memoryBacking>\n");
     }
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 24aa79c..f50b575 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -567,6 +567,32 @@ typedef enum {
     VIR_DOMAIN_DISK_MIRROR_STATE_LAST
 } virDomainDiskMirrorState;
 
+# define VIR_DOMAIN_MEMORY_DEFAULT_PATH "/var/lib/libvirt/qemu"
+
+typedef enum {
+    VIR_DOMAIN_MEMORY_SOURCE_NONE = 0,  /* No memory source defined */
+    VIR_DOMAIN_MEMORY_SOURCE_FILE,      /* Memory source is set as file */
+    VIR_DOMAIN_MEMORY_SOURCE_ANONYMOUS, /* Memory source is set as anonymous */
+
+    VIR_DOMAIN_MEMORY_SOURCE_LAST,
+} virDomainMemorySource;
+
+typedef enum {
+    VIR_DOMAIN_MEMORY_ACCESS_NONE = 0,  /*  No memory access defined */
+    VIR_DOMAIN_MEMORY_ACCESS_SHARED,    /* Memory access is set as shared */
+    VIR_DOMAIN_MEMORY_ACCESS_PRIVATE,   /* Memory access is set as private */
+
+    VIR_DOMAIN_MEMORY_ACCESS_LAST,
+} virDomainMemoryAccess;
+
+typedef enum {
+    VIR_DOMAIN_MEMORY_ALLOCATION_NONE = 0,  /* No memory allocation defined */
+    VIR_DOMAIN_MEMORY_ALLOCATION_IMMEDIATE, /* Memory allocation is set as immediate */
+    VIR_DOMAIN_MEMORY_ALLOCATION_ONDEMAND,  /* Memory allocation is set as ondemand */
+
+    VIR_DOMAIN_MEMORY_ALLOCATION_LAST,
+} virDomainMemoryAllocation;
+
 
 /* Stores the virtual disk configuration */
 struct _virDomainDiskDef {
@@ -2100,6 +2126,10 @@ struct _virDomainMemtune {
     unsigned long long soft_limit; /* in kibibytes, limit at off_t bytes */
     unsigned long long min_guarantee; /* in kibibytes, limit at off_t bytes */
     unsigned long long swap_hard_limit; /* in kibibytes, limit at off_t bytes */
+
+    int source; /* enum virDomainMemorySource */
+    int access; /* enum virDomainMemoryAccess */
+    int allocation; /* enum virDomainMemoryAllocation */
 };
 
 typedef struct _virDomainPowerManagement virDomainPowerManagement;
@@ -3083,6 +3113,9 @@ VIR_ENUM_DECL(virDomainTPMModel)
 VIR_ENUM_DECL(virDomainTPMBackend)
 VIR_ENUM_DECL(virDomainMemoryModel)
 VIR_ENUM_DECL(virDomainMemoryBackingModel)
+VIR_ENUM_DECL(virDomainMemorySource)
+VIR_ENUM_DECL(virDomainMemoryAccess)
+VIR_ENUM_DECL(virDomainMemoryAllocation)
 VIR_ENUM_DECL(virDomainIOMMUModel)
 /* from libvirt.h */
 VIR_ENUM_DECL(virDomainState)
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-memorybacking-set.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-memorybacking-set.xml
new file mode 100644
index 0000000..f63ae38
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-memorybacking-set.xml
@@ -0,0 +1,40 @@
+<domain type='qemu'>
+  <name>SomeDummyHugepagesGuest</name>
+  <uuid>ef1bdff4-27f3-4e85-a807-5fb4d58463cc</uuid>
+  <memory unit='KiB'>1048576</memory>
+  <currentMemory unit='KiB'>1048576</currentMemory>
+  <memoryBacking>
+    <source type='file'/>
+    <access mode='shared'/>
+    <allocation mode='immediate'/>
+  </memoryBacking>
+  <vcpu placement='static'>2</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+    </controller>
+    <controller type='ide' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='virtio'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </memballoon>
+  </devices>
+</domain>
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-memorybacking-unset.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-memorybacking-unset.xml
new file mode 100644
index 0000000..7de9ffb
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-memorybacking-unset.xml
@@ -0,0 +1,40 @@
+<domain type='qemu'>
+  <name>SomeDummyHugepagesGuest</name>
+  <uuid>ef1bdff4-27f3-4e85-a807-5fb4d58463cc</uuid>
+  <memory unit='KiB'>1048576</memory>
+  <currentMemory unit='KiB'>1048576</currentMemory>
+  <memoryBacking>
+    <source type='anonymous'/>
+    <access mode='private'/>
+    <allocation mode='ondemand'/>
+  </memoryBacking>
+  <vcpu placement='static'>2</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+    </controller>
+    <controller type='ide' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='virtio'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </memballoon>
+  </devices>
+</domain>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 496ed13..7e92ca3 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -879,6 +879,9 @@ mymain(void)
     DO_TEST("virtio-input", NONE);
     DO_TEST("virtio-input-passthrough", NONE);
 
+    DO_TEST("memorybacking-set", NONE);
+    DO_TEST("memorybacking-unset", NONE);
+
     virObjectUnref(cfg);
 
     DO_TEST("acpi-table", NONE);
-- 
2.7.4

--------------------------------------------------------------
Intel Research and Development Ireland Limited
Registered in Ireland
Registered Office: Collinstown Industrial Park, Leixlip, County Kildare
Registered Number: 308263


This e-mail and any attachments may contain confidential material for the sole
use of the intended recipient(s). Any review or distribution by others is
strictly prohibited. If you are not the intended recipient, please contact the
sender and delete all copies.

--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list



[Index of Archives]     [Virt Tools]     [Libvirt Users]     [Lib OS Info]     [Fedora Users]     [Fedora Desktop]     [Fedora SELinux]     [Big List of Linux Books]     [Yosemite News]     [KDE Users]     [Fedora Tools]