Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
@@ -339,6 +339,8 @@
 
   bool GetQXferSigInfoReadSupported();
 
+  bool GetMultiprocessSupported();
+
   LazyBool SupportsAllocDeallocMemory() // const
   {
     // Uncomment this to have lldb pretend the debug server doesn't respond to
Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
@@ -181,6 +181,12 @@
   return m_supports_qXfer_siginfo_read == eLazyBoolYes;
 }
 
+bool GDBRemoteCommunicationClient::GetMultiprocessSupported() {
+  if (m_supports_memory_tagging == eLazyBoolCalculate)
+    GetRemoteQSupported();
+  return m_supports_multiprocess == eLazyBoolYes;
+}
+
 uint64_t GDBRemoteCommunicationClient::GetRemoteMaxPacketSize() {
   if (m_max_packet_size == 0) {
     GetRemoteQSupported();
@@ -1514,7 +1520,7 @@
     }
   }
 
-  if (m_supports_multiprocess) {
+  if (GetMultiprocessSupported()) {
     // Some servers (e.g. qemu) require specifying the PID even if only a single
     // process is running.
     if (pid == LLDB_INVALID_PROCESS_ID)
Index: lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
+++ lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
@@ -1186,11 +1186,18 @@
     StreamString continue_packet;
     bool continue_packet_error = false;
     if (m_gdb_comm.HasAnyVContSupport()) {
+      std::string pid_prefix;
+      if (m_gdb_comm.GetMultiprocessSupported())
+        pid_prefix = llvm::formatv("p{0:x-}.", GetID());
+
       if (m_continue_c_tids.size() == num_threads ||
           (m_continue_c_tids.empty() && m_continue_C_tids.empty() &&
            m_continue_s_tids.empty() && m_continue_S_tids.empty())) {
-        // All threads are continuing, just send a "c" packet
-        continue_packet.PutCString("c");
+        // All threads are continuing
+        if (m_gdb_comm.GetMultiprocessSupported())
+          continue_packet.Format("vCont;c:{0}-1", pid_prefix);
+        else
+          continue_packet.PutCString("c");
       } else {
         continue_packet.PutCString("vCont");
 
@@ -1200,7 +1207,7 @@
                      t_pos = m_continue_c_tids.begin(),
                      t_end = m_continue_c_tids.end();
                  t_pos != t_end; ++t_pos)
-              continue_packet.Printf(";c:%4.4" PRIx64, *t_pos);
+              continue_packet.Format(";c:{0}{1:x-}", pid_prefix, *t_pos);
           } else
             continue_packet_error = true;
         }
@@ -1211,8 +1218,8 @@
                      s_pos = m_continue_C_tids.begin(),
                      s_end = m_continue_C_tids.end();
                  s_pos != s_end; ++s_pos)
-              continue_packet.Printf(";C%2.2x:%4.4" PRIx64, s_pos->second,
-                                     s_pos->first);
+              continue_packet.Format(";C{0:x-2}:{1}{2:x-}", s_pos->second,
+                                     pid_prefix, s_pos->first);
           } else
             continue_packet_error = true;
         }
@@ -1223,7 +1230,7 @@
                      t_pos = m_continue_s_tids.begin(),
                      t_end = m_continue_s_tids.end();
                  t_pos != t_end; ++t_pos)
-              continue_packet.Printf(";s:%4.4" PRIx64, *t_pos);
+              continue_packet.Format(";s:{0}{1:x-}", pid_prefix, *t_pos);
           } else
             continue_packet_error = true;
         }
@@ -1234,8 +1241,8 @@
                      s_pos = m_continue_S_tids.begin(),
                      s_end = m_continue_S_tids.end();
                  s_pos != s_end; ++s_pos)
-              continue_packet.Printf(";S%2.2x:%4.4" PRIx64, s_pos->second,
-                                     s_pos->first);
+              continue_packet.Format(";S{0:x-2}:{1}{2:x-}", s_pos->second,
+                                     pid_prefix, s_pos->first);
           } else
             continue_packet_error = true;
         }
Index: lldb/test/API/functionalities/gdb_remote_client/TestContinue.py
===================================================================
--- /dev/null
+++ lldb/test/API/functionalities/gdb_remote_client/TestContinue.py
@@ -0,0 +1,74 @@
+import lldb
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.decorators import *
+from lldbsuite.test.gdbclientutils import *
+from lldbsuite.test.lldbgdbclient import GDBRemoteTestBase
+
+
+class TestContinue(GDBRemoteTestBase):
+    class BaseResponder(MockGDBServerResponder):
+        def qSupported(self, client_supported):
+            return "PacketSize=3fff;QStartNoAckMode+;multiprocess+"
+
+        def qfThreadInfo(self):
+            return "mp400.401"
+
+        def haltReason(self):
+            return "S13"
+
+        def cont(self):
+            return "W01"
+
+        def other(self, packet):
+            if packet == "vCont?":
+                return "vCont;c;C;s;S"
+            if packet.startswith("vCont;"):
+                return "W00"
+            return ""
+
+    def test_continue_no_multiprocess(self):
+        class MyResponder(self.BaseResponder):
+            def qSupported(self, client_supported):
+                return "PacketSize=3fff;QStartNoAckMode+"
+
+            def qfThreadInfo(self):
+                return "m401"
+
+        self.server.responder = MyResponder()
+        self.runCmd("platform select remote-linux")
+        target = self.createTarget("a.yaml")
+        process = self.connect(target)
+        lldbutil.expect_state_changes(self, self.dbg.GetListener(), process,
+                                      [lldb.eStateExited])
+        self.assertPacketLogContains(["vCont;C13:401"])
+
+    def test_continue_no_vCont(self):
+        class MyResponder(self.BaseResponder):
+            def qSupported(self, client_supported):
+                return "PacketSize=3fff;QStartNoAckMode+"
+
+            def qfThreadInfo(self):
+                return "m401"
+
+            def other(self, packet):
+                return ""
+
+        self.server.responder = MyResponder()
+        self.runCmd("platform select remote-linux")
+        target = self.createTarget("a.yaml")
+        process = self.connect(target)
+        lldbutil.expect_state_changes(self, self.dbg.GetListener(), process,
+                                      [lldb.eStateExited])
+        self.assertPacketLogContains(["Hc401", "C13"])
+
+    def test_continue_multiprocess(self):
+        class MyResponder(self.BaseResponder):
+            pass
+
+        self.server.responder = MyResponder()
+        self.runCmd("platform select remote-linux")
+        target = self.createTarget("a.yaml")
+        process = self.connect(target)
+        lldbutil.expect_state_changes(self, self.dbg.GetListener(), process,
+                                      [lldb.eStateExited])
+        self.assertPacketLogContains(["vCont;C13:p400.401"])