[PATCH 4/5] xenconfig: Add support for 'passthrough' hypervisor feature

[Jim Fehlig <jfehlig@xxxxxxxx>]

Add support for xl.cfg(5) 'passthrough' option in the domXML-to-xenconfig
configuration converter.

Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---
 src/libvirt_private.syms |  2 ++
 src/libxl/xen_common.c   | 50 +++++++++++++++++++++++++++++++++++-----
 2 files changed, 46 insertions(+), 6 deletions(-)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index ec367653d5..54a0378f36 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -649,6 +649,8 @@ virDomainWatchdogActionTypeToString;
 virDomainWatchdogDefFree;
 virDomainWatchdogModelTypeFromString;
 virDomainWatchdogModelTypeToString;
+virDomainXenPassthroughModeTypeFromString;
+virDomainXenPassthroughModeTypeToString;
 virDomainXMLOptionGetNamespace;
 virDomainXMLOptionGetSaveCookie;
 virDomainXMLOptionNew;
diff --git a/src/libxl/xen_common.c b/src/libxl/xen_common.c
index 87c66becaf..5c37e431eb 100644
--- a/src/libxl/xen_common.c
+++ b/src/libxl/xen_common.c
@@ -530,14 +530,14 @@ xenParseCPU(virConfPtr conf,
 static int
 xenParseHypervisorFeatures(virConfPtr conf, virDomainDefPtr def)
 {
-    g_autofree char *tsc_mode = NULL;
+    g_autofree char *strval = NULL;
     virDomainTimerDefPtr timer;
     int val = 0;
 
-    if (xenConfigGetString(conf, "tsc_mode", &tsc_mode, NULL) < 0)
+    if (xenConfigGetString(conf, "tsc_mode", &strval, NULL) < 0)
         return -1;
 
-    if (tsc_mode) {
+    if (strval) {
         if (VIR_EXPAND_N(def->clock.timers, def->clock.ntimers, 1) < 0 ||
             VIR_ALLOC(timer) < 0)
             return -1;
@@ -547,16 +547,40 @@ xenParseHypervisorFeatures(virConfPtr conf, virDomainDefPtr def)
         timer->tickpolicy = -1;
         timer->mode = VIR_DOMAIN_TIMER_MODE_AUTO;
         timer->track = -1;
-        if (STREQ_NULLABLE(tsc_mode, "always_emulate"))
+        if (STREQ_NULLABLE(strval, "always_emulate"))
             timer->mode = VIR_DOMAIN_TIMER_MODE_EMULATE;
-        else if (STREQ_NULLABLE(tsc_mode, "native"))
+        else if (STREQ_NULLABLE(strval, "native"))
             timer->mode = VIR_DOMAIN_TIMER_MODE_NATIVE;
-        else if (STREQ_NULLABLE(tsc_mode, "native_paravirt"))
+        else if (STREQ_NULLABLE(strval, "native_paravirt"))
             timer->mode = VIR_DOMAIN_TIMER_MODE_PARAVIRT;
 
         def->clock.timers[def->clock.ntimers - 1] = timer;
     }
 
+    if (xenConfigGetString(conf, "passthrough", &strval, NULL) < 0)
+        return -1;
+
+    if (strval) {
+        if (STREQ(strval, "disabled")) {
+            def->features[VIR_DOMAIN_FEATURE_XEN] = VIR_TRISTATE_SWITCH_OFF;
+            def->xen_features[VIR_DOMAIN_XEN_PASSTHROUGH] = VIR_TRISTATE_SWITCH_OFF;
+        } else if (STREQ(strval, "enabled")) {
+            def->features[VIR_DOMAIN_FEATURE_XEN] = VIR_TRISTATE_SWITCH_ON;
+            def->xen_features[VIR_DOMAIN_XEN_PASSTHROUGH] = VIR_TRISTATE_SWITCH_ON;
+        } else if (STREQ(strval, "sync_pt")) {
+            def->features[VIR_DOMAIN_FEATURE_XEN] = VIR_TRISTATE_SWITCH_ON;
+            def->xen_features[VIR_DOMAIN_XEN_PASSTHROUGH] = VIR_TRISTATE_SWITCH_ON;
+            def->xen_passthrough_mode = VIR_DOMAIN_XEN_PASSTHROUGH_MODE_SYNC_PT;
+        } else if (STREQ(strval, "share_pt")) {
+            def->features[VIR_DOMAIN_FEATURE_XEN] = VIR_TRISTATE_SWITCH_ON;
+            def->xen_features[VIR_DOMAIN_XEN_PASSTHROUGH] = VIR_TRISTATE_SWITCH_ON;
+            def->xen_passthrough_mode = VIR_DOMAIN_XEN_PASSTHROUGH_MODE_SHARE_PT;
+        } else {
+            virReportError(VIR_ERR_CONF_SYNTAX,
+                           _("Invalid passthrough mode %s"), strval);
+        }
+    }
+
     if (def->os.type == VIR_DOMAIN_OSTYPE_HVM) {
         if (xenConfigGetBool(conf, "pae", &val, 1) < 0)
             return -1;
@@ -2163,6 +2187,20 @@ xenFormatHypervisorFeatures(virConfPtr conf, virDomainDefPtr def)
         }
     }
 
+    if (def->features[VIR_DOMAIN_FEATURE_XEN] == VIR_TRISTATE_SWITCH_ON) {
+        if (def->xen_features[VIR_DOMAIN_XEN_PASSTHROUGH] == VIR_TRISTATE_SWITCH_ON) {
+            if (def->xen_passthrough_mode == VIR_DOMAIN_XEN_PASSTHROUGH_MODE_SYNC_PT ||
+                def->xen_passthrough_mode == VIR_DOMAIN_XEN_PASSTHROUGH_MODE_SHARE_PT) {
+                if (xenConfigSetString(conf, "passthrough",
+                                       virDomainXenPassthroughModeTypeToString(def->xen_passthrough_mode)) < 0)
+                    return -1;
+            } else {
+                if (xenConfigSetString(conf, "passthrough", "enabled") < 0)
+                    return -1;
+            }
+        }
+    }
+
     for (i = 0; i < def->clock.ntimers; i++) {
         switch ((virDomainTimerNameType)def->clock.timers[i]->name) {
         case VIR_DOMAIN_TIMER_NAME_TSC:
-- 
2.26.0