diff mbox

[v2,01/10] hw/mips/cputimer: Don't start periodic timer in KVM mode

Message ID 1387203165-5553-2-git-send-email-james.hogan@imgtec.com (mailing list archive)
State New, archived
Headers show

Commit Message

James Hogan Dec. 16, 2013, 2:12 p.m. UTC 
From: Sanjay Lal <sanjayl@kymasys.com>

Compare/Count timer interrupts are handled in-kernel for KVM, so don't
bother starting it in QEMU.

Signed-off-by: Sanjay Lal <sanjayl@kymasys.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
---
Changes in v2:
 - Expand commit message
 - Rebase on v1.7.0
 - Wrap comment
---
 hw/mips/cputimer.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

Comments

Aurelien Jarno Dec. 21, 2013, 3:34 p.m. UTC | #1 
On Mon, Dec 16, 2013 at 02:12:36PM +0000, James Hogan wrote:
> From: Sanjay Lal <sanjayl@kymasys.com>
> 
> Compare/Count timer interrupts are handled in-kernel for KVM, so don't
> bother starting it in QEMU.
> 
> Signed-off-by: Sanjay Lal <sanjayl@kymasys.com>
> Signed-off-by: James Hogan <james.hogan@imgtec.com>
> Cc: Aurelien Jarno <aurelien@aurel32.net>
> ---
> Changes in v2:
>  - Expand commit message
>  - Rebase on v1.7.0
>  - Wrap comment
> ---
>  hw/mips/cputimer.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/mips/cputimer.c b/hw/mips/cputimer.c
> index c8b4b00..52570fd 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
>  
> @@ -141,7 +142,13 @@ 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);
> -    env->CP0_Compare = 0;
> -    cpu_mips_store_count(env, 1);
> +    /*
> +     * If we're in KVM mode, don't start the periodic timer, that is handled in
> +     * kernel.
> +     */
> +    if (!kvm_enabled()) {
> +        env->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &mips_timer_cb, env);
> +        env->CP0_Compare = 0;
> +        cpu_mips_store_count(env, 1);
> +    }
>  }

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
diff mbox

Patch

diff --git a/hw/mips/cputimer.c b/hw/mips/cputimer.c
index c8b4b00..52570fd 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
 
@@ -141,7 +142,13 @@  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);
-    env->CP0_Compare = 0;
-    cpu_mips_store_count(env, 1);
+    /*
+     * If we're in KVM mode, don't start the periodic timer, that is handled in
+     * kernel.
+     */
+    if (!kvm_enabled()) {
+        env->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &mips_timer_cb, env);
+        env->CP0_Compare = 0;
+        cpu_mips_store_count(env, 1);
+    }
 }