[Qemu-devel] [PATCH uq/master 2/2] kvm: forward INIT signals coming from the chipset

[Paolo Bonzini <pbonzini@redhat.com>]

CPU_INTERRUPT_INIT can also be generated if you have an internal APIC,
since the keyboard controller and the southbridge can also pulse the
CPU's INIT# pin.

Exit the VCPU is one is received, and process it by changing the
mp_state to KVM_MP_STATE_INIT_RECEIVED.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target-i386/kvm.c | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 0cf413d..56de77c 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -1772,14 +1772,15 @@ void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
         }
     }
 
-    if (!kvm_irqchip_in_kernel()) {
-        /* Force the VCPU out of its inner loop to process any INIT requests
-         * or pending TPR access reports. */
-        if (env->interrupt_request &
-            (CPU_INTERRUPT_INIT | CPU_INTERRUPT_TPR)) {
-            cpu->exit_request = 1;
-        }
+    /* Force the VCPU out of its inner loop to process any INIT requests
+     * or (for userspace APIC, but it is cheap to combine the checks here)
+     * pending TPR access reports.
+     */
+    if (env->interrupt_request & (CPU_INTERRUPT_INIT | CPU_INTERRUPT_TPR)) {
+        cpu->exit_request = 1;
+    }
 
+    if (!kvm_irqchip_in_kernel()) {
         /* Try to inject an interrupt if the guest can accept it */
         if (run->ready_for_interrupt_injection &&
             (env->interrupt_request & CPU_INTERRUPT_HARD) &&
@@ -1835,6 +1836,7 @@ int kvm_arch_process_async_events(CPUState *cs)
 {
     X86CPU *cpu = X86_CPU(cs);
     CPUX86State *env = &cpu->env;
+    int ret;
 
     if (env->interrupt_request & CPU_INTERRUPT_MCE) {
         /* We must not raise CPU_INTERRUPT_MCE if it's not supported. */
@@ -1859,6 +1861,20 @@ int kvm_arch_process_async_events(CPUState *cs)
         }
     }
 
+    if (env->interrupt_request & CPU_INTERRUPT_INIT) {
+        kvm_cpu_synchronize_state(env);
+        if (kvm_irqchip_in_kernel()) {
+            env->mp_state = KVM_MP_STATE_INIT_RECEIVED;
+            env->interrupt_request = 0;
+            ret = kvm_put_mp_state(cpu);
+            if (ret < 0) {
+                return ret;
+            }
+        } else {
+            do_cpu_init(cpu);
+        }
+    }
+
     if (kvm_irqchip_in_kernel()) {
         return 0;
     }
@@ -1872,10 +1888,6 @@ int kvm_arch_process_async_events(CPUState *cs)
         (env->interrupt_request & CPU_INTERRUPT_NMI)) {
         env->halted = 0;
     }
-    if (env->interrupt_request & CPU_INTERRUPT_INIT) {
-        kvm_cpu_synchronize_state(env);
-        do_cpu_init(cpu);
-    }
     if (env->interrupt_request & CPU_INTERRUPT_SIPI) {
         kvm_cpu_synchronize_state(env);
         do_cpu_sipi(cpu);
-- 
1.8.1.4