On Thu, 01 Apr 2021 14:55:54 +0100,
Alexandru Elisei wrote:
[...]
> Had another go at this, and as I was looking at the code, I realized that
> conceptually, trapping debug registers access (MDCR_EL2.TDA) is tied to:
>
> - KVM_ARM64_DEBUG_DIRTY *not* being set (guest is debugging itself and
Hi Marc,
On 3/30/21 8:57 PM, Marc Zyngier wrote:
> On Tue, 30 Mar 2021 18:49:54 +0100,
> Alexandru Elisei wrote:
>> Hi Marc,
>>
>> On 3/30/21 6:13 PM, Alexandru Elisei wrote:
>>> [..]
> +}
> +
> /**
> * kvm_arm_reset_debug_ptr - reset the debug ptr to point to the vcpu
>
On Wed, 31 Mar 2021 16:25:46 +0100,
Alexandru Elisei wrote:
>
> Hi Marc,
>
> On 3/30/21 9:07 PM, Marc Zyngier wrote:
[...]
> > I think it would be absolutely fine to make the slow path of
> > kvm_vcpu_first_run_init() run with preempt disabled. This happens so
> > rarely that that it isn't
Hi Marc,
On 3/30/21 9:07 PM, Marc Zyngier wrote:
> On Tue, 30 Mar 2021 18:13:07 +0100,
> Alexandru Elisei wrote:
>> Hi Marc,
>>
>> Thanks for having a look!
>>
>> On 3/30/21 10:55 AM, Marc Zyngier wrote:
>>> Hi Alex,
>>>
>>> On Tue, 23 Mar 2021 18:00:57 +,
>>> Alexandru Elisei wrote:
Hi Marc,
On 3/30/21 8:57 PM, Marc Zyngier wrote:
> On Tue, 30 Mar 2021 18:49:54 +0100,
> Alexandru Elisei wrote:
>> Hi Marc,
>>
>> On 3/30/21 6:13 PM, Alexandru Elisei wrote:
>>> [..]
> +}
> +
> /**
> * kvm_arm_reset_debug_ptr - reset the debug ptr to point to the vcpu
>
On Tue, 30 Mar 2021 18:13:07 +0100,
Alexandru Elisei wrote:
>
> Hi Marc,
>
> Thanks for having a look!
>
> On 3/30/21 10:55 AM, Marc Zyngier wrote:
> > Hi Alex,
> >
> > On Tue, 23 Mar 2021 18:00:57 +,
> > Alexandru Elisei wrote:
> >> When a VCPU is created, the kvm_vcpu struct is
On Tue, 30 Mar 2021 18:49:54 +0100,
Alexandru Elisei wrote:
>
> Hi Marc,
>
> On 3/30/21 6:13 PM, Alexandru Elisei wrote:
> > [..]
> >>> +}
> >>> +
> >>> /**
> >>> * kvm_arm_reset_debug_ptr - reset the debug ptr to point to the vcpu
> >>> state
> >>> */
> >>> @@ -83,12 +137,7 @@ void
Hi Marc,
On 3/30/21 6:13 PM, Alexandru Elisei wrote:
> [..]
>>> +}
>>> +
>>> /**
>>> * kvm_arm_reset_debug_ptr - reset the debug ptr to point to the vcpu state
>>> */
>>> @@ -83,12 +137,7 @@ void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu)
>>> * @vcpu: the vcpu pointer
>>> *
>>> *
Hi Marc,
Thanks for having a look!
On 3/30/21 10:55 AM, Marc Zyngier wrote:
> Hi Alex,
>
> On Tue, 23 Mar 2021 18:00:57 +,
> Alexandru Elisei wrote:
>> When a VCPU is created, the kvm_vcpu struct is initialized to zero in
>> kvm_vm_ioctl_create_vcpu(). On VHE systems, the first time
>>
Hi Alex,
On Tue, 23 Mar 2021 18:00:57 +,
Alexandru Elisei wrote:
>
> When a VCPU is created, the kvm_vcpu struct is initialized to zero in
> kvm_vm_ioctl_create_vcpu(). On VHE systems, the first time
> vcpu.arch.mdcr_el2 is loaded on hardware is in vcpu_load(), before it is
> set to a
When a VCPU is created, the kvm_vcpu struct is initialized to zero in
kvm_vm_ioctl_create_vcpu(). On VHE systems, the first time
vcpu.arch.mdcr_el2 is loaded on hardware is in vcpu_load(), before it is
set to a sensible value in kvm_arm_setup_debug() later in the run loop. The
result is that KVM
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