libxl: add support for PVH

Since this is something between PV and HVM, it makes sense to put the
setting in place where domain type is specified.
To enable it, use <os><type machine="xenpvh">xenpvh</type></os>. It is
also included in capabilities.xml, for every supported HVM guest type - it
doesn't seems to be any other requirement (besides new enough Xen).
Signed-off-by: NMarek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: NJim Fehlig <jfehlig@suse.com>

docs/formatcaps.html.in

@@ -74,11 +74,14 @@
         is able to run. Possible values are:
         <dl>
           <dt><code>xen</code></dt>
-          <dd>for XEN</dd>
+          <dd>for XEN PV</dd>
 
           <dt><code>linux</code></dt>
           <dd>legacy alias for <code>xen</code></dd>
 
+          <dt><code>xenpvh</code></dt>
+          <dd>for XEN PVH</dd>
+
           <dt><code>hvm</code></dt>
           <dd>Unmodified operating system</dd>
 
@@ -104,8 +107,8 @@
             <dt><code>machine</code></dt><dd>Machine type, for use in
               <a href="formatdomain.html#attributeOSTypeMachine">machine</a>
               attribute of os/type element in domain XML. For example Xen
-              supports <code>xenfv</code> for HVM or <code>xenpv</code> for
-              PV.</dd>
+              supports <code>xenfv</code> for HVM, <code>xenpv</code> for
+              PV, or <code>xenpvh</code> for PVH.</dd>
             <dt><code>domain</code></dt><dd>The <code>type</code> attribute of
               this element specifies the type of hypervisor required to run the
               domain. Use in <a href="formatdomain.html#attributeDomainType">type</a>

docs/schemas/domaincommon.rng

@@ -341,12 +341,14 @@
           <choice>
             <value>xenpv</value>
             <value>xenfv</value>
+            <value>xenpvh</value>
           </choice>
         </attribute>
       </optional>
       <choice>
         <value>xen</value>
         <value>linux</value>
+        <value>xenpvh</value>
       </choice>
     </element>
   </define>

m4/virt-driver-libxl.m4

@@ -75,6 +75,9 @@ AC_DEFUN([LIBVIRT_DRIVER_CHECK_LIBXL], [
     ])
   fi
 
+  dnl Check if Xen has support for PVH
+  AC_CHECK_DECL(LIBXL_DOMAIN_TYPE_PVH, [AC_DEFINE([HAVE_XEN_PVH], [1], [Define to 1 if Xen has PVH support.])], [], [#include <libxl.h>])
+
   AC_SUBST([LIBXL_CFLAGS])
   AC_SUBST([LIBXL_LIBS])
 ])

src/conf/domain_conf.c

@@ -126,7 +126,8 @@ VIR_ENUM_IMPL(virDomainOS, VIR_DOMAIN_OSTYPE_LAST,
               "xen",
               "linux",
               "exe",
-              "uml")
+              "uml",
+              "xenpvh")
 
 VIR_ENUM_IMPL(virDomainBoot, VIR_DOMAIN_BOOT_LAST,
               "fd",
@@ -12932,7 +12933,8 @@ virDomainInputDefParseXML(virDomainXMLOptionPtr xmlopt,
                                bus);
                 goto error;
             }
-        } else if (dom->os.type == VIR_DOMAIN_OSTYPE_XEN) {
+        } else if (dom->os.type == VIR_DOMAIN_OSTYPE_XEN ||
+                   dom->os.type == VIR_DOMAIN_OSTYPE_XENPVH) {
             if (def->bus != VIR_DOMAIN_INPUT_BUS_XEN) {
                 virReportError(VIR_ERR_INTERNAL_ERROR,
                                _("unsupported input bus %s"),
@@ -12981,7 +12983,8 @@ virDomainInputDefParseXML(virDomainXMLOptionPtr xmlopt,
             } else {
                 def->bus = VIR_DOMAIN_INPUT_BUS_USB;
             }
-        } else if (dom->os.type == VIR_DOMAIN_OSTYPE_XEN) {
+        } else if (dom->os.type == VIR_DOMAIN_OSTYPE_XEN ||
+                   dom->os.type == VIR_DOMAIN_OSTYPE_XENPVH) {
             def->bus = VIR_DOMAIN_INPUT_BUS_XEN;
         } else {
             if ((dom->virtType == VIR_DOMAIN_VIRT_VZ ||
@@ -18770,6 +18773,7 @@ virDomainDefParseBootOptions(virDomainDefPtr def,
     }
 
     if (def->os.type == VIR_DOMAIN_OSTYPE_XEN ||
+        def->os.type == VIR_DOMAIN_OSTYPE_XENPVH ||
         def->os.type == VIR_DOMAIN_OSTYPE_HVM ||
         def->os.type == VIR_DOMAIN_OSTYPE_UML) {
         xmlNodePtr loader_node;

src/conf/domain_conf.h

@@ -255,6 +255,7 @@ typedef enum {
     VIR_DOMAIN_OSTYPE_LINUX,
     VIR_DOMAIN_OSTYPE_EXE,
     VIR_DOMAIN_OSTYPE_UML,
+    VIR_DOMAIN_OSTYPE_XENPVH,
 
     VIR_DOMAIN_OSTYPE_LAST
 } virDomainOSType;

src/libxl/libxl_capabilities.c

@@ -57,6 +57,7 @@ struct guest_arch {
     virArch arch;
     int bits;
     int hvm;
+    int pvh;
     int pae;
     int nonpae;
     int ia64_be;
@@ -491,20 +492,44 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
                 guest_archs[i].nonpae = nonpae;
             if (ia64_be)
                 guest_archs[i].ia64_be = ia64_be;
+
+            /*
+             * Xen 4.10 introduced support for the PVH guest type, which
+             * requires hardware virtualization support similar to the
+             * HVM guest type. Add a PVH guest type for each new HVM
+             * guest type.
+             */
+#ifdef HAVE_XEN_PVH
+            if (hvm && i == nr_guest_archs-1) {
+                /* Ensure we have not exhausted the guest_archs array */
+                if (nr_guest_archs >= ARRAY_CARDINALITY(guest_archs))
+                    continue;
+                i = nr_guest_archs;
+                nr_guest_archs++;
+
+                guest_archs[i].arch = arch;
+                guest_archs[i].hvm = 0;
+                guest_archs[i].pvh = 1;
+            }
+#endif
         }
     }
     regfree(&regex);
 
     for (i = 0; i < nr_guest_archs; ++i) {
         virCapsGuestPtr guest;
-        char const *const xen_machines[] = {guest_archs[i].hvm ? "xenfv" : "xenpv"};
+        char const *const xen_machines[] = {
+            guest_archs[i].hvm ? "xenfv" :
+                (guest_archs[i].pvh ? "xenpvh" : "xenpv")};
         virCapsGuestMachinePtr *machines;
 
         if ((machines = virCapabilitiesAllocMachines(xen_machines, 1)) == NULL)
             return -1;
 
         if ((guest = virCapabilitiesAddGuest(caps,
-                                             guest_archs[i].hvm ? VIR_DOMAIN_OSTYPE_HVM : VIR_DOMAIN_OSTYPE_XEN,
+                                             guest_archs[i].hvm ? VIR_DOMAIN_OSTYPE_HVM :
+                                                (guest_archs[i].pvh ? VIR_DOMAIN_OSTYPE_XENPVH :
+                                                 VIR_DOMAIN_OSTYPE_XEN),
                                              guest_archs[i].arch,
                                              LIBXL_EXECBIN_DIR "/qemu-system-i386",
                                              (guest_archs[i].hvm ?
@@ -557,7 +582,9 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
                                                1,
                                                0) == NULL)
                 return -1;
+        }
 
+        if (guest_archs[i].hvm || guest_archs[i].pvh) {
             if (virCapabilitiesAddGuestFeature(guest,
                                                "hap",
                                                1,
@@ -580,7 +607,7 @@ libxlMakeDomainOSCaps(const char *machine,
 
     os->supported = true;
 
-    if (STREQ(machine, "xenpv"))
+    if (STREQ(machine, "xenpv") || STREQ(machine, "xenpvh"))
         return 0;
 
     capsLoader->supported = true;
@@ -734,9 +761,12 @@ libxlMakeDomainCapabilities(virDomainCapsPtr domCaps,
     if (libxlMakeDomainOSCaps(domCaps->machine, os, firmwares, nfirmwares) < 0 ||
         libxlMakeDomainDeviceDiskCaps(disk) < 0 ||
         libxlMakeDomainDeviceGraphicsCaps(graphics) < 0 ||
-        libxlMakeDomainDeviceVideoCaps(video) < 0 ||
+        libxlMakeDomainDeviceVideoCaps(video) < 0)
+        return -1;
+    if (STRNEQ(domCaps->machine, "xenpvh") &&
         libxlMakeDomainDeviceHostdevCaps(hostdev) < 0)
         return -1;
+
     return 0;
 }
 

src/libxl/libxl_conf.c

@@ -133,8 +133,19 @@ libxlMakeDomCreateInfo(libxl_ctx *ctx,
 
     libxl_domain_create_info_init(c_info);
 
-    if (def->os.type == VIR_DOMAIN_OSTYPE_HVM) {
+    if (def->os.type == VIR_DOMAIN_OSTYPE_HVM ||
+        def->os.type == VIR_DOMAIN_OSTYPE_XENPVH) {
+#ifdef HAVE_XEN_PVH
+        c_info->type = def->os.type == VIR_DOMAIN_OSTYPE_HVM ?
+            LIBXL_DOMAIN_TYPE_HVM : LIBXL_DOMAIN_TYPE_PVH;
+#else
+        if (def->os.type == VIR_DOMAIN_OSTYPE_XENPVH) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                    _("PVH guest os type not supported"));
+            return -1;
+        }
         c_info->type = LIBXL_DOMAIN_TYPE_HVM;
+#endif
         switch ((virTristateSwitch) def->features[VIR_DOMAIN_FEATURE_HAP]) {
         case VIR_TRISTATE_SWITCH_OFF:
             libxl_defbool_set(&c_info->hap, false);
@@ -276,16 +287,26 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
     virDomainClockDef clock = def->clock;
     libxl_ctx *ctx = cfg->ctx;
     libxl_domain_build_info *b_info = &d_config->b_info;
-    int hvm = def->os.type == VIR_DOMAIN_OSTYPE_HVM;
+    bool hvm = def->os.type == VIR_DOMAIN_OSTYPE_HVM;
+    bool pvh = def->os.type == VIR_DOMAIN_OSTYPE_XENPVH;
     size_t i;
     size_t nusbdevice = 0;
 
     libxl_domain_build_info_init(b_info);
 
-    if (hvm)
+    if (hvm) {
         libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_HVM);
-    else
+    } else if (pvh) {
+#ifdef HAVE_XEN_PVH
+        libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_PVH);
+#else
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                _("PVH guest os type not supported"));
+        return -1;
+#endif
+    } else {
         libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_PV);
+    }
 
     b_info->max_vcpus = virDomainDefGetVcpusMax(def);
     if (libxl_cpu_bitmap_alloc(ctx, &b_info->avail_vcpus, b_info->max_vcpus))
@@ -375,7 +396,7 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
     def->mem.cur_balloon = VIR_ROUND_UP(def->mem.cur_balloon, 1024);
     b_info->max_memkb = virDomainDefGetMemoryInitial(def);
     b_info->target_memkb = def->mem.cur_balloon;
-    if (hvm) {
+    if (hvm || pvh) {
         if (caps &&
             def->cpu && def->cpu->mode == (VIR_CPU_MODE_HOST_PASSTHROUGH)) {
             bool hasHwVirt = false;
@@ -646,6 +667,22 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
             VIR_DISPOSE_N(b_info->u.hvm.usbdevice_list, nusbdevice);
             return -1;
         }
+#endif
+    } else if (pvh) {
+        if (VIR_STRDUP(b_info->cmdline, def->os.cmdline) < 0)
+            return -1;
+        if (VIR_STRDUP(b_info->kernel, def->os.kernel) < 0)
+            return -1;
+        if (VIR_STRDUP(b_info->ramdisk, def->os.initrd) < 0)
+            return -1;
+#ifdef LIBXL_HAVE_BUILDINFO_BOOTLOADER
+        if (VIR_STRDUP(b_info->bootloader, def->os.bootloader) < 0)
+            return -1;
+        if (def->os.bootloaderArgs) {
+            if (!(b_info->bootloader_args =
+                  virStringSplit(def->os.bootloaderArgs, " \t\n", 0)))
+                return -1;
+        }
 #endif
     } else {
         /*
@@ -1226,11 +1263,12 @@ libxlMakeNic(virDomainDefPtr def,
      * hvm guest").
      */
     if (l_nic->model) {
-        if (def->os.type == VIR_DOMAIN_OSTYPE_XEN &&
+        if ((def->os.type == VIR_DOMAIN_OSTYPE_XEN ||
+            def->os.type == VIR_DOMAIN_OSTYPE_XENPVH) &&
             STRNEQ(l_nic->model, "netfront")) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                            _("only model 'netfront' is supported for "
-                             "Xen PV domains"));
+                             "Xen PV(H) domains"));
             return -1;
         }
         if (VIR_STRDUP(x_nic->model, l_nic->model) < 0)

src/libxl/libxl_driver.c

@@ -6398,9 +6398,11 @@ libxlConnectGetDomainCapabilities(virConnectPtr conn,
         emulatorbin = "/usr/bin/qemu-system-x86_64";
 
     if (machine) {
-        if (STRNEQ(machine, "xenpv") && STRNEQ(machine, "xenfv")) {
+        if (STRNEQ(machine, "xenpv") &&
+            STRNEQ(machine, "xenpvh") &&
+            STRNEQ(machine, "xenfv")) {
             virReportError(VIR_ERR_INVALID_ARG, "%s",
-                           _("Xen only supports 'xenpv' and 'xenfv' machines"));
+                           _("Xen only supports 'xenpv', 'xenpvh' and 'xenfv' machines"));
             goto cleanup;
         }
     } else {