irqchip/gic-v3-its: Setup VLPI properties at map time

So far, we require the hypervisor to update the VLPI properties
once the the VLPI mapping has been established. While this
makes it easy for the ITS driver, it creates a window where
an incoming interrupt can be delivered with an unknown set
of properties. Not very nice.

Instead, let's add a "properties" field to the mapping structure,
and use that to configure the VLPI before it actually gets mapped.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2017-10-26 10:44:07 +01:00
parent 05f3647359
commit d4d7b4ad2f
2 changed files with 18 additions and 2 deletions

View File

@ -1008,9 +1008,15 @@ static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)
if (irqd_is_forwarded_to_vcpu(d)) {
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
u32 event = its_get_event_id(d);
struct its_vlpi_map *map;
prop_page = its_dev->event_map.vm->vprop_page;
hwirq = its_dev->event_map.vlpi_maps[event].vintid;
map = &its_dev->event_map.vlpi_maps[event];
hwirq = map->vintid;
/* Remember the updated property */
map->properties &= ~clr;
map->properties |= set | LPI_PROP_GROUP1;
} else {
prop_page = gic_rdists->prop_page;
hwirq = d->hwirq;
@ -1249,12 +1255,20 @@ static int its_vlpi_map(struct irq_data *d, struct its_cmd_info *info)
/* Ensure all the VPEs are mapped on this ITS */
its_map_vm(its_dev->its, info->map->vm);
/*
* Flag the interrupt as forwarded so that we can
* start poking the virtual property table.
*/
irqd_set_forwarded_to_vcpu(d);
/* Write out the property to the prop table */
lpi_write_config(d, 0xff, info->map->properties);
/* Drop the physical mapping */
its_send_discard(its_dev, event);
/* and install the virtual one */
its_send_vmapti(its_dev, event);
irqd_set_forwarded_to_vcpu(d);
/* Increment the number of VLPIs */
its_dev->event_map.nr_vlpis++;

View File

@ -71,12 +71,14 @@ struct its_vpe {
* @vm: Pointer to the GICv4 notion of a VM
* @vpe: Pointer to the GICv4 notion of a virtual CPU (VPE)
* @vintid: Virtual LPI number
* @properties: Priority and enable bits (as written in the prop table)
* @db_enabled: Is the VPE doorbell to be generated?
*/
struct its_vlpi_map {
struct its_vm *vm;
struct its_vpe *vpe;
u32 vintid;
u8 properties;
bool db_enabled;
};