[PATCH 1/4] avoid halted state for in kernel irqchip

From: Glauber Costa <glommer@redhat.com>
To: kvm@vger.kernel.org
Cc: avi@redhat.com
Subject: [PATCH 1/4] avoid halted state for in kernel irqchip
Date: Wed,  3 Jun 2009 14:25:41 -0400	[thread overview]
Message-ID: <1244053544-12074-2-git-send-email-glommer@redhat.com> (raw)
In-Reply-To: <1244053544-12074-1-git-send-email-glommer@redhat.com>

This patch is part of a series that tries to provide
a kvm-free apic implementation. In the last interation,
Jan pointed out that halted state management with in kernel
irqchip gets quite messy. I don't disagree.

It broke this series specifically, as init IPIs had the
halted state set. The solution would be to rework halted
state management. But I'm too lazy. Besides, gleb told me
he would do it, which makes it his problem, not mine. ;-)

This patch can be used to bypass the problem entirely:
if kvm apic do not call apic_init_ipi, but a version of it
that does everything but mangling around with cpu states,
the problem becomes a non issue, and my glorious series
can be applied.

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 hw/apic.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/apic.c b/hw/apic.c
index 86aa6b6..862289d 100644
--- a/hw/apic.c
+++ b/hw/apic.c
@@ -443,8 +443,7 @@ static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask,
     }
 }
 
-
-static void apic_init_ipi(APICState *s)
+static void apic_init_ipi_state(APICState *s)
 {
     int i;
 
@@ -466,6 +465,11 @@ static void apic_init_ipi(APICState *s)
     s->next_time = 0;
 
     cpu_reset(s->cpu_env);
+}
+
+static void apic_init_ipi(APICState *s)
+{
+    apic_init_ipi_state(s);
 
     if (!(s->apicbase & MSR_IA32_APICBASE_BSP) &&
         (!kvm_enabled() || !qemu_kvm_irqchip_in_kernel()))
-- 
1.5.6.6

