[Qemu-devel] [PATCH] kvm-all.c: Move init of irqchip_inject_ioctl out of kvm_irqchip_create()

[Peter Maydell]

Move the init of the irqchip_inject_ioctl field of KVMState out of
kvm_irqchip_create() and into kvm_init(), so that kvm_set_irq()
can be used even when no irqchip is created (for architectures
that support async interrupt notification even without an in
kernel irqchip).

Signed-off-by: Peter Maydell <address@hidden>
---
We can't just set irqchip_inject_ioctl in target-*/kvm.c because
the KVMState struct layout is private to kvm-all.c. Moving the
default initialisation of this field seemed the simplest approach.
It's safe because the use in kvm_set_irq() is guarded by a check of
kvm_async_interrupts_enabled().

The other approach would be to have a helper function for setting
the field, but that seems overkill when KVM_IRQ_LINE is the standard
default value. (KVM_IRQ_LINE_STATUS seems to be undocumented,
incidentally. I am going to assume it's another x86ism until somebody
does document it :-))

 kvm-all.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kvm-all.c b/kvm-all.c
index 6def6c9..9a1f001 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1200,7 +1200,6 @@ static int kvm_irqchip_create(KVMState *s)
         return ret;
     }
 
-    s->irqchip_inject_ioctl = KVM_IRQ_LINE;
     if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) {
         s->irqchip_inject_ioctl = KVM_IRQ_LINE_STATUS;
     }
@@ -1321,6 +1320,8 @@ int kvm_init(void)
     s->direct_msi = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
 #endif
 
+    s->irqchip_inject_ioctl = KVM_IRQ_LINE;
+
     ret = kvm_arch_init(s);
     if (ret < 0) {
         goto err;
-- 
1.7.9.5