On 2015/7/9 19:50, Christoffer Dall wrote:
> On Tue, Jul 07, 2015 at 11:24:06AM +0100, Will Deacon wrote:
>> On Tue, Jul 07, 2015 at 11:06:57AM +0100, Zhichao Huang wrote:
>>> Chazy and me are talking about how to reduce the saving/restoring
>>> overhead for debug registers.
>>> We want to add a s
On July 9, 2015 1:08:55 AM GMT+08:00, Will Deacon wrote:
>On Wed, Jul 08, 2015 at 11:50:22AM +0100, Zhichao Huang wrote:
>> Are you happy with this?:
>
>You miss the reserved breakpoint, I think.
Sorry, I can't quite understand. What is the reserved breakpoint?
When arch_[iu]ninstall_hw_breakp
On Tue, Jul 07, 2015 at 11:24:06AM +0100, Will Deacon wrote:
> On Tue, Jul 07, 2015 at 11:06:57AM +0100, Zhichao Huang wrote:
> > Chazy and me are talking about how to reduce the saving/restoring
> > overhead for debug registers.
> > We want to add a state in hw_breakpoint.c to indicate whether the
On Wed, Jul 08, 2015 at 11:50:22AM +0100, Zhichao Huang wrote:
> Are you happy with this?:
You miss the reserved breakpoint, I think.
I also still don't understand why this is preferable to trapping.
Will
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Hi, Will,
Are you happy with this?:
diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
+bool hw_breakpoint_enabled(void)
+{
+struct perf_event **slots;
+int i;
+
+slots = this_cpu_ptr(bp_on_reg);
+for (i = 0; i < core_num_brps; i++) {
+if (slot
On Tue, Jul 07, 2015 at 11:06:57AM +0100, Zhichao Huang wrote:
> Chazy and me are talking about how to reduce the saving/restoring
> overhead for debug registers.
> We want to add a state in hw_breakpoint.c to indicate whether the host
> enable any hwbrpts or not (might export a fuction that kvm ca
Hi, Will,
Chazy and me are talking about how to reduce the saving/restoring
overhead for debug registers.
We want to add a state in hw_breakpoint.c to indicate whether the host
enable any hwbrpts or not (might export a fuction that kvm can call),
then we can read this state from memory instead of
On Fri, Jul 03, 2015 at 05:54:47PM +0800, Zhichao Huang wrote:
>
>
> On June 30, 2015 5:20:20 PM GMT+08:00, Christoffer Dall
> wrote:
> >On Mon, Jun 22, 2015 at 06:41:31PM +0800, Zhichao Huang wrote:
> >> The trapping code keeps track of the state of the debug registers,
> >> allowing for the s
On June 30, 2015 5:20:20 PM GMT+08:00, Christoffer Dall
wrote:
>On Mon, Jun 22, 2015 at 06:41:31PM +0800, Zhichao Huang wrote:
>> The trapping code keeps track of the state of the debug registers,
>> allowing for the switch code to implement a lazy switching strategy.
>>
>> Signed-off-by: Zhic
On Mon, Jun 22, 2015 at 06:41:31PM +0800, Zhichao Huang wrote:
> The trapping code keeps track of the state of the debug registers,
> allowing for the switch code to implement a lazy switching strategy.
>
> Signed-off-by: Zhichao Huang
> ---
> arch/arm/include/asm/kvm_asm.h | 3 +++
> arch/arm
The trapping code keeps track of the state of the debug registers,
allowing for the switch code to implement a lazy switching strategy.
Signed-off-by: Zhichao Huang
---
arch/arm/include/asm/kvm_asm.h | 3 +++
arch/arm/include/asm/kvm_host.h | 3 +++
arch/arm/kernel/asm-offsets.c | 1 +
arc
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