[Qemu-devel] [PATCH v5 02/12] hw/mips/cputimer: Don't start periodic timer in KVM mode

[James Hogan]

From: Sanjay Lal <address@hidden>

Compare/Count timer interrupts are handled in-kernel for KVM. Therefore
don't bother creating the timer at init time if KVM is enabled. This
will conveniently avoid attempts to set the timeout when
cpu_mips_store_count() is called at reset with KVM enabled, treating the
timer as stopped so that CP0_Count is modified directly.

Signed-off-by: Sanjay Lal <address@hidden>
address@hidden: Update after "target-mips: Reset CPU timer
consistently" which moves timer start to reset time]
Signed-off-by: James Hogan <address@hidden>
Cc: Aurelien Jarno <address@hidden>
Cc: Paolo Bonzini <address@hidden>
---
Changes in v5:
 - Update commit message and comment in cpu_mips_clock_init() after the
   patch "target-mips: Reset CPU timer consistently") (Paolo Bonzini).

Changes in v2:
 - Expand commit message
 - Rebase on v1.7.0
 - Wrap comment
---
 hw/mips/cputimer.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/hw/mips/cputimer.c b/hw/mips/cputimer.c
index 6900a745c60c..577c9aeab877 100644
--- a/hw/mips/cputimer.c
+++ b/hw/mips/cputimer.c
@@ -23,6 +23,7 @@
 #include "hw/hw.h"
 #include "hw/mips/cpudevs.h"
 #include "qemu/timer.h"
+#include "sysemu/kvm.h"
 
 #define TIMER_FREQ     100 * 1000 * 1000
 
@@ -146,5 +147,11 @@ static void mips_timer_cb (void *opaque)
 
 void cpu_mips_clock_init (CPUMIPSState *env)
 {
-    env->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &mips_timer_cb, env);
+    /*
+     * If we're in KVM mode, don't create the periodic timer, that is handled 
in
+     * kernel.
+     */
+    if (!kvm_enabled()) {
+        env->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &mips_timer_cb, env);
+    }
 }
-- 
1.9.3