Re: [RFC v2 1/6] xen/arm: Save and restore support with hvm context hypercalls

[Julien Grall <julien.grall@linaro.org>]

On 05/13/2014 05:44 PM, Wei Huang wrote:
> On 05/13/2014 11:37 AM, Julien Grall wrote:
>> On 05/13/2014 05:18 PM, Wei Huang wrote:
>>> Given the comments from you and Andrew, I will revise the context struct
>>> to the following format. With this, we can get rid of most problems
>>> (switch/case/...).
>>
>> With this solution, you will duplicate code to save/restore the timer.
> The code size will be reduced and looks cleaner? Here is the example:

LGTM except ...

> static int hvm_timer_save(struct domain *d, hvm_domain_context_t *h)
> {
>     struct hvm_arm_timer ctxt;
>     struct vcpu *v;
>     int rc = 0;
> 
>     /* Save the state of vtimer and ptimer */
>     for_each_vcpu( d, v )
>     {
>         /* save phys_timer */
>         ctxt.phys_cval = v->arch.phys_timer.cval;
>         ctxt.phys_ctl = v->arch.phys_timer.ctl;
>         ctxt.phys_vtb_offset = d->arch.phys_timer_base.offset;
> 
>         /* save virt_timer */
>         ctxt.virt_cval = v->arch.virt_timer.cval;
>         ctxt.virt_ctl = v->arch.virt_timer.ctl;
>         ctxt.virt_vtb_offset = d->arch.virt_timer_base.offset;

I think you need to store d->arch.virt_timer_base.offset in ns rather
than ticks.

Regards,

-- 
Julien Grall