[PATCH 3/3] libxl: add .domainSendKey

[Chunyan Liu <cyliu@xxxxxxxx>]

libxl supports sysrq. Add .domainSendKey function to support
sending sysrq key.

Signed-off-by: Chunyan Liu <cyliu@xxxxxxxx>
---
 src/libxl/libxl_driver.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 53c87ce..6cc5fe6 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -56,6 +56,7 @@
 #include "viratomic.h"
 #include "virhostdev.h"
 #include "network/bridge_driver.h"
+#include "virkeycode.h"
 
 #define VIR_FROM_THIS VIR_FROM_LIBXL
 
@@ -4729,6 +4730,93 @@ libxlDomainMigrateConfirm3Params(virDomainPtr domain,
     return libxlDomainMigrationConfirm(driver, vm, flags, cancelled);
 }
 
+typedef struct keyname_to_letter {
+   const char *keyname;
+   const char *letter;
+} keyname_to_letter;
+
+static const keyname_to_letter sysrq_keymap[] = {
+    {"KEY_0", "0"}, {"KEY_1", "1"}, {"KEY_2", "2"}, {"KEY_3", "3"},
+    {"KEY_4", "4"}, {"KEY_5", "5"}, {"KEY_6", "6"}, {"KEY_7", "7"},
+    {"KEY_8", "8"}, {"KEY_9", "9"}, {"KEY_A", "a"}, {"KEY_B", "b"},
+    {"KEY_C", "c"}, {"KEY_D", "d"}, {"KEY_E", "e"}, {"KEY_F", "f"},
+    {"KEY_G", "g"}, {"KEY_H", "h"}, {"KEY_I", "i"}, {"KEY_J", "j"},
+    {"KEY_K", "k"}, {"KEY_L", "l"}, {"KEY_M", "m"}, {"KEY_N", "n"},
+    {"KEY_O", "o"}, {"KEY_P", "p"}, {"KEY_Q", "q"}, {"KEY_R", "r"},
+    {"KEY_S", "s"}, {"KEY_T", "t"}, {"KEY_U", "u"}, {"KEY_V", "v"},
+    {"KEY_W", "w"}, {"KEY_X", "x"}, {"KEY_Y", "y"}, {"KEY_Z", "z"},
+    {NULL, NULL}
+};
+
+static int
+libxlDomainSendKey(virDomainPtr dom,
+                   unsigned int codeset,
+                   unsigned int holdtime ATTRIBUTE_UNUSED,
+                   unsigned int *keycodes,
+                   int nkeycodes,
+                   unsigned int flags)
+{
+    virDomainObjPtr vm;
+    libxlDomainObjPrivatePtr priv;
+    const char *keyname0, *keyname1;
+    int ret = -1;
+
+    virCheckFlags(0, -1);
+
+    if (!(vm = libxlDomObjFromDomain(dom)))
+        goto cleanup;
+
+    priv = vm->privateData;
+
+    if (virDomainSendKeyEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    /* check key, only support sending magic sysrq. Like:
+     * #virsh send-key guest1 KEY_LEFTALT KEY_SYSRQ KEY_H
+     */
+    if (nkeycodes < 3)
+        goto non_sysrq;
+
+    keyname0 = virKeynameFromKeycode(codeset, keycodes[0]);
+    keyname1 = virKeynameFromKeycode(codeset, keycodes[1]);
+    if (!keyname0 || !keyname1)
+        goto non_sysrq;
+
+    if ((STREQ(keyname0, "KEY_LEFTALT") && STREQ(keyname1, "KEY_SYSRQ")) ||
+        (STREQ(keyname1, "KEY_LEFTALT") && STREQ(keyname0, "KEY_SYSRQ"))) {
+        const keyname_to_letter *item = sysrq_keymap;
+        char *key = NULL;
+        const char *keyname = virKeynameFromKeycode(codeset, keycodes[2]);
+
+        while (item && item->keyname) {
+            if (keyname && STREQ(item->keyname, keyname)) {
+                if (VIR_STRDUP(key, item->letter) < 0)
+                    goto cleanup;
+                break;
+            }
+            item++;
+        }
+
+        if (!key)
+            goto non_sysrq;
+
+        ret = libxl_send_sysrq(priv->ctx, vm->def->id, key[0]);
+        VIR_FREE(key);
+        goto cleanup;
+
+    } else {
+        goto non_sysrq;
+    }
+
+ non_sysrq:
+    virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED,
+                   "%s", _("Sending non-sysrq keys is not supported"));
+
+ cleanup:
+    if (vm)
+        virObjectUnlock(vm);
+    return ret;
+}
 
 static virHypervisorDriver libxlDriver = {
     .no = VIR_DRV_LIBXL,
@@ -4824,6 +4912,7 @@ static virHypervisorDriver libxlDriver = {
     .domainMigratePerform3Params = libxlDomainMigratePerform3Params, /* 1.2.6 */
     .domainMigrateFinish3Params = libxlDomainMigrateFinish3Params, /* 1.2.6 */
     .domainMigrateConfirm3Params = libxlDomainMigrateConfirm3Params, /* 1.2.6 */
+    .domainSendKey = libxlDomainSendKey, /* 1.2.11 */
 };
 
 static virStateDriver libxlStateDriver = {
-- 
1.8.4.5

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