hax: Honor CPUState::halted

QEMU tracks whether a vcpu is halted using CPUState::halted. E.g.,
after initialization or reset, halted is 0 for the BSP (vcpu 0)
and 1 for the APs (vcpu 1, 2, ...). A halted vcpu should not be
handed to the hypervisor to run (e.g. hax_vcpu_run()).

Under HAXM, Android Emulator sometimes boots into a "vcpu shutdown
request" error while executing in SeaBIOS, with the HAXM driver
logging a guest triple fault in vcpu 1, 2, ... at RIP 0x3. That is
ultimately because the HAX accelerator asks HAXM to run those APs
when they are still in the halted state.

Normally, the vcpu thread for an AP will start by looping in
qemu_wait_io_event(), until the BSP kicks it via a pair of IPIs
(INIT followed by SIPI). But because the HAX accelerator does not
honor cpu->halted, it allows the AP vcpu thread to proceed to
hax_vcpu_run() as soon as it receives any kick, even if the kick
does not come from the BSP. It turns out that emulator has a
worker thread which periodically kicks every vcpu thread (possibly
to collect CPU usage data), and if one of these kicks comes before
those by the BSP, the AP will start execution from the wrong RIP,
resulting in the aforementioned SMP boot failure.

The solution is inspired by the KVM accelerator (credit to
Chuanxiao Dong <chuanxiao.dong@intel.com> for the pointer):

1. Get rid of questionable logic that unconditionally resets
   cpu->halted before hax_vcpu_run(). Instead, only reset it at the
   right moments (there are only a few "unhalt" events).
2. Add a check for cpu->halted before hax_vcpu_run().

Note that although the non-Unrestricted Guest (!ug_platform) code
path also forcibly resets cpu->halted, it is left untouched,
because only the UG code path supports SMP guests.

The patch is first merged to android emulator with Change-Id:
I9c5752cc737fd305d7eace1768ea12a07309d716

Cc: Yu Ning <yu.ning@intel.com>
Cc: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Colin Xu <colin.xu@intel.com>
Message-Id: <20190610021939.13669-1-colin.xu@intel.com>

cpus.c

@@ -1594,7 +1594,6 @@ static void *qemu_hax_cpu_thread_fn(void *arg)
 
     cpu->thread_id = qemu_get_thread_id();
     cpu->created = true;
-    cpu->halted = 0;
     current_cpu = cpu;
 
     hax_init_vcpu(cpu);

target/i386/hax-all.c

@@ -471,13 +471,35 @@ static int hax_vcpu_hax_exec(CPUArchState *env)
         return 0;
     }
 
-    cpu->halted = 0;
-
     if (cpu->interrupt_request & CPU_INTERRUPT_POLL) {
         cpu->interrupt_request &= ~CPU_INTERRUPT_POLL;
         apic_poll_irq(x86_cpu->apic_state);
     }
 
+    /* After a vcpu is halted (either because it is an AP and has just been
+     * reset, or because it has executed the HLT instruction), it will not be
+     * run (hax_vcpu_run()) until it is unhalted. The next few if blocks check
+     * for events that may change the halted state of this vcpu:
+     *  a) Maskable interrupt, when RFLAGS.IF is 1;
+     *     Note: env->eflags may not reflect the current RFLAGS state, because
+     *           it is not updated after each hax_vcpu_run(). We cannot afford
+     *           to fail to recognize any unhalt-by-maskable-interrupt event
+     *           (in which case the vcpu will halt forever), and yet we cannot
+     *           afford the overhead of hax_vcpu_sync_state(). The current
+     *           solution is to err on the side of caution and have the HLT
+     *           handler (see case HAX_EXIT_HLT below) unconditionally set the
+     *           IF_MASK bit in env->eflags, which, in effect, disables the
+     *           RFLAGS.IF check.
+     *  b) NMI;
+     *  c) INIT signal;
+     *  d) SIPI signal.
+     */
+    if (((cpu->interrupt_request & CPU_INTERRUPT_HARD) &&
+         (env->eflags & IF_MASK)) ||
+        (cpu->interrupt_request & CPU_INTERRUPT_NMI)) {
+        cpu->halted = 0;
+    }
+
     if (cpu->interrupt_request & CPU_INTERRUPT_INIT) {
         DPRINTF("\nhax_vcpu_hax_exec: handling INIT for %d\n",
                 cpu->cpu_index);
@@ -493,6 +515,16 @@ static int hax_vcpu_hax_exec(CPUArchState *env)
         hax_vcpu_sync_state(env, 1);
     }
 
+    if (cpu->halted) {
+        /* If this vcpu is halted, we must not ask HAXM to run it. Instead, we
+         * break out of hax_smp_cpu_exec() as if this vcpu had executed HLT.
+         * That way, this vcpu thread will be trapped in qemu_wait_io_event(),
+         * until the vcpu is unhalted.
+         */
+        cpu->exception_index = EXCP_HLT;
+        return 0;
+    }
+
     do {
         int hax_ret;