Re: [Xen-devel] [PATCH v1 10/11] xsplice: Add support for exception tables

[Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>]

On 11/27/2015 04:28 PM, Martin Pohlack wrote:
> On 03.11.2015 19:16, Ross Lagerwall wrote:
> > +#ifdef CONFIG_X86
> > +unsigned long search_module_extables(unsigned long addr)
> > +{
> > +    struct payload *data;
> > +    unsigned long ret;
> > +
> > +    /* No locking since this list is only ever changed during apply or revert
> > +     * context. */
> How do you make sure that no exception is triggered in the patching
> process itself (also for future code changes)?
>
> Could we use a lockless update on the list of module ex-tables?
That seems like overkill. The patching process either simply does 
list_add_tail or list_del to update the list, so unless you expect those 
to generate exceptions, I don't think you gain anything by doing 
lockless updates.
--
Ross Lagerwall

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