[Qemu-devel] [PATCH 03/15] kvm: Install optimized interrupt handlers

[Jan Kiszka]

KVM only requires to set the raised IRQ in CPUState and, if the user
space irqchip is used, to kick the receiving vcpu if it is remote.

Signed-off-by: Jan Kiszka <address@hidden>
---
 kvm-all.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index 226843c..c460d45 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -650,6 +650,20 @@ static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {
     .log_stop = kvm_log_stop,
 };
 
+static void kvm_handle_interrupt(CPUState *env, int mask)
+{
+    env->interrupt_request |= mask;
+
+    if (!qemu_cpu_self(env)) {
+        qemu_cpu_kick(env);
+    }
+}
+
+static void kvm_handle_interrupt_kernel_irqchip(CPUState *env, int mask)
+{
+    env->interrupt_request |= mask;
+}
+
 int kvm_init(void)
 {
     static const char upgrade_note[] =
@@ -758,6 +772,9 @@ int kvm_init(void)
 
     s->many_ioeventfds = kvm_check_many_ioeventfds();
 
+    cpu_interrupt_handler = kvm_irqchip_in_kernel() ?
+        kvm_handle_interrupt_kernel_irqchip : kvm_handle_interrupt;
+
     return 0;
 
 err:
-- 
1.7.1