Add some verbose remote prints

Author: fwsGonzo

lib/tinykvm/machine.cpp

@@ -144,6 +144,9 @@ void Machine::reset_to(std::string_view binary, const MachineOptions& options)
 	if (UNLIKELY(this->is_forked() || this->is_forkable())) {
 		throw MachineException("Machine is forked or forkable, cannot be reset");
 	}
+	/* Disconnect from the remote, if it's still connected */
+	this->remote_disconnect();
+
 	this->m_mmap_cache = {};
 	this->m_mt.reset(nullptr);
 	this->m_signals.reset(nullptr);
@@ -165,6 +168,9 @@ bool Machine::reset_to(const Machine& other, const MachineOptions& options)
 	assert(m_forked && other.m_prepped &&
 		"This machine must be forked, and the source must be prepped");
 
+	/* Disconnect from the remote, if it's still connected */
+	this->remote_disconnect();
+
 	bool full_reset = false;
 	if (UNLIKELY(this->m_binary.begin() != other.m_binary.begin() ||
 		memory.compare(other.memory) == false))

lib/tinykvm/remote.cpp

@@ -3,6 +3,7 @@
 #include "amd64/usercode.hpp"
 
 namespace tinykvm {
+static constexpr bool VERBOSE_REMOTE = false;
 
 Machine& Machine::remote()
 {
@@ -62,6 +63,10 @@ void Machine::remote_connect(Machine& remote, bool connect_now)
 
 	// Finalize
 	this->m_remote = &remote;
+	if constexpr (VERBOSE_REMOTE) {
+		fprintf(stderr, "Remote connected: this VM %p remote VM %p (%s)\n",
+			this, &remote, connect_now ? "just-in-time" : "setup");
+	}
 }
 
 Machine::address_t Machine::remote_activate_now()
@@ -102,6 +107,9 @@ Machine::address_t Machine::remote_disconnect()
 	// Restore original FSBASE
 	auto tls_base = this->vcpu.remote_original_tls_base;
 	this->vcpu.remote_original_tls_base = 0;
+	if constexpr (VERBOSE_REMOTE) {
+		fprintf(stderr, "Remote disconnected: this VM %p remote VM %p\n", this, this->m_remote);
+	}
 	return tls_base;
 }
 bool Machine::is_remote_connected() const noexcept