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Re: [PATCH v8 05/13] xen: extend domctl interface for cache coloring
- To: Carlo Nonato <carlo.nonato@xxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 6 May 2024 14:05:12 +0200
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- Cc: andrea.bastoni@xxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Marco Solieri <marco.solieri@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 06 May 2024 12:05:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.05.2024 18:55, Carlo Nonato wrote:
> Add a new domctl hypercall to allow the user to set LLC coloring
> configurations. Colors can be set only once, just after domain creation,
> since recoloring isn't supported.
>
> Based on original work from: Luca Miccio <lucmiccio@xxxxxxxxx>
>
> Signed-off-by: Carlo Nonato <carlo.nonato@xxxxxxxxxxxxxxx>
> Signed-off-by: Marco Solieri <marco.solieri@xxxxxxxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
with one remark:
> @@ -226,6 +226,46 @@ void domain_llc_coloring_free(struct domain *d)
> xfree(__va(__pa(d->llc_colors)));
> }
>
> +int domain_set_llc_colors(struct domain *d,
> + const struct xen_domctl_set_llc_colors *config)
> +{
> + unsigned int *colors;
> +
> + if ( d->num_llc_colors )
> + return -EEXIST;
> +
> + if ( !config->num_llc_colors )
> + {
> + domain_set_default_colors(d);
> + return 0;
> + }
> +
> + if ( config->num_llc_colors > max_nr_colors )
> + return -EINVAL;
> +
> + colors = xmalloc_array(unsigned int, config->num_llc_colors);
> + if ( !colors )
> + return -ENOMEM;
> +
> + if ( copy_from_guest(colors, config->llc_colors, config->num_llc_colors)
> )
> + {
> + xfree(colors);
> + return -EFAULT;
> + }
> +
> + if ( !check_colors(colors, config->num_llc_colors) )
> + {
> + printk(XENLOG_ERR "Bad LLC color config for %pd\n", d);
Slightly shorter (and more in line with what we have elsewhere) as
printk(XENLOG_ERR "%pd: bad LLC color config\n", d);
Jan
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