[PATCH v4 2/5] libxl: add support for PVH

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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">...</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: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
Changes in v2 proposed by Jim:
 - use new_arch_added var instead of i == nr_guest_archs for clarity
 - improve comment
 - adjust for now required Xen >= 4.6 (remove part for Xen < 4.5)

Changes in v3:
 - limit VIR_DOMAIN_OSTYPE_XEN -> VIR_DOMAIN_OSTYPE_LINUX conversion to
 Xen PV only
 - do not accept VIR_DOMAIN_OSTYPE_LINUX for PVH
 - fix reported capabilities for PVH - remove hostdev passthrough and
 video/graphics
 - use #ifdef LIBXL_DOMAIN_TYPE_PVH instead of hypervisor version to
 check for PVH support
 - compile fix for Xen < 4.9

Changes in v4:
 - revert to "i == nr_guest_archs-1" check
 - let configure check for LIBXL_DOMAIN_TYPE_PVH and use #ifdef
 HAVE_XEN_PVH then
 - fix comment about Xen version
---
 docs/formatcaps.html.in        |  4 +--
 docs/schemas/domaincommon.rng  |  1 +-
 m4/virt-driver-libxl.m4        |  3 ++-
 src/conf/domain_conf.c         |  6 ++--
 src/libxl/libxl_capabilities.c | 38 ++++++++++++++++++++++-----
 src/libxl/libxl_conf.c         | 50 ++++++++++++++++++++++++++++++-----
 src/libxl/libxl_driver.c       |  6 ++--
 7 files changed, 90 insertions(+), 18 deletions(-)

diff --git a/docs/formatcaps.html.in b/docs/formatcaps.html.in
index 0d9c53d..fe113bc 100644
--- a/docs/formatcaps.html.in
+++ b/docs/formatcaps.html.in
@@ -104,8 +104,8 @@
             <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>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 099a949..820a7c6 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -341,6 +341,7 @@
           <choice>
             <value>xenpv</value>
             <value>xenfv</value>
+            <value>xenpvh</value>
           </choice>
         </attribute>
       </optional>
diff --git a/m4/virt-driver-libxl.m4 b/m4/virt-driver-libxl.m4
index 479d911..2cd97cc 100644
--- a/m4/virt-driver-libxl.m4
+++ b/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])
 ])
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9911d56..a945ad4 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -19094,7 +19094,8 @@ virDomainDefParseCaps(virDomainDefPtr def,
      * be 'xen'. So we accept the former and convert
      */
     if (def->os.type == VIR_DOMAIN_OSTYPE_LINUX &&
-        def->virtType == VIR_DOMAIN_VIRT_XEN) {
+        def->virtType == VIR_DOMAIN_VIRT_XEN &&
+        (!def->os.machine || STREQ(def->os.machine, "xenpv"))) {
         def->os.type = VIR_DOMAIN_OSTYPE_XEN;
     }
 
@@ -27705,7 +27706,8 @@ virDomainDefFormatInternal(virDomainDefPtr def,
      * be 'xen'. So we convert to the former for backcompat
      */
     if (def->virtType == VIR_DOMAIN_VIRT_XEN &&
-        def->os.type == VIR_DOMAIN_OSTYPE_XEN)
+        def->os.type == VIR_DOMAIN_OSTYPE_XEN &&
+        (!def->os.machine || STREQ(def->os.machine, "xenpv")))
         virBufferAsprintf(buf, ">%s</type>\n",
                           virDomainOSTypeToString(VIR_DOMAIN_OSTYPE_LINUX));
     else
diff --git a/src/libxl/libxl_capabilities.c b/src/libxl/libxl_capabilities.c
index 18596c7..eecd5e9 100644
--- a/src/libxl/libxl_capabilities.c
+++ b/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;
@@ -491,13 +492,33 @@ 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) {
+                i = nr_guest_archs;
+                /* Ensure we have not exhausted the guest_archs array */
+                if (nr_guest_archs >= ARRAY_CARDINALITY(guest_archs))
+                    continue;
+                guest_archs[nr_guest_archs].arch = arch;
+                guest_archs[nr_guest_archs].pvh = 1;
+                nr_guest_archs++;
+            }
+#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)
@@ -557,7 +578,9 @@ 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 +603,7 @@ libxlMakeDomainOSCaps(const char *machine,
 
     os->supported = true;
 
-    if (STREQ(machine, "xenpv"))
+    if (STREQ(machine, "xenpv") || STREQ(machine, "xenpvh"))
         return 0;
 
     capsLoader->supported = true;
@@ -732,11 +755,14 @@ libxlMakeDomainCapabilities(virDomainCapsPtr domCaps,
         domCaps->maxvcpus = PV_MAX_VCPUS;
 
     if (libxlMakeDomainOSCaps(domCaps->machine, os, firmwares, nfirmwares) < 0 ||
-        libxlMakeDomainDeviceDiskCaps(disk) < 0 ||
-        libxlMakeDomainDeviceGraphicsCaps(graphics) < 0 ||
-        libxlMakeDomainDeviceVideoCaps(video) < 0 ||
-        libxlMakeDomainDeviceHostdevCaps(hostdev) < 0)
+        libxlMakeDomainDeviceDiskCaps(disk) < 0)
+        return -1;
+    if (STRNEQ(domCaps->machine, "xenpvh") &&
+        (libxlMakeDomainDeviceGraphicsCaps(graphics) < 0 ||
+         libxlMakeDomainDeviceVideoCaps(video) < 0 ||
+         libxlMakeDomainDeviceHostdevCaps(hostdev) < 0))
         return -1;
+
     return 0;
 }
 
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index f3da0ed..db50a73 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -133,8 +133,20 @@ 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_XEN &&
+             STREQ(def->os.machine, "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 (STREQ(def->os.machine, "xenpvh")) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                    _("PVH guest 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 +288,26 @@ 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 = STREQ(def->os.machine, "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 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 +397,7 @@ 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;
@@ -647,6 +669,22 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
             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 {
         /*
          * For compatibility with the legacy xen toolstack, default to pygrub
@@ -1230,7 +1268,7 @@ libxlMakeNic(virDomainDefPtr def,
             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)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index efd47a3..6287cef 100644
--- a/src/libxl/libxl_driver.c
+++ b/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 {
-- 
git-series 0.9.1

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