Re: [Xen-devel] [PATCH RFC v2 09/12] xen/arm: Data abort exception (R/W) mem_events.

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hello Tamas,

On 27/08/14 10:06, Tamas K Lengyel wrote:
>   /*
>    * Lookup the MFN corresponding to a domain's PFN.
>    *
>    * There are no processor functions to do a stage 2 only lookup therefore we
>    * do a a software walk.
> + *
> + * [IN]:  d      Domain
> + * [IN]:  paddr  IPA
> + * [IN]:  a      (Optional) Update PTE access permission
> + * [OUT]: t      (Optional) Return PTE type
>    */
> -paddr_t p2m_lookup(struct domain *d, paddr_t paddr, p2m_type_t *t)
> +paddr_t p2m_lookup(struct domain *d,
> +    paddr_t paddr,
> +    p2m_access_t *a,
> +    p2m_type_t *t)
The indentation looks wrong here.

>   {
>       struct p2m_domain *p2m = &d->arch.p2m;
> -    lpae_t pte, *first = NULL, *second = NULL, *third = NULL;
> +    lpae_t pte, *pte_loc, *first = NULL, *second = NULL, *third = NULL;
>       paddr_t maddr = INVALID_PADDR;
>       paddr_t mask;
>       p2m_type_t _t;
> @@ -167,20 +251,20 @@ paddr_t p2m_lookup(struct domain *d, paddr_t paddr, 
> p2m_type_t *t)
>
>       *t = p2m_invalid;
>
> -    spin_lock(&p2m->lock);
> -
If you need a version with the lock already taken, please introduce a 
new function (i.e p2m_lookup_locked or smth else) rather than move the 
lock in every caller.
Regards,

--
Julien Grall

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