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

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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
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18
drivers/irqchip/irq-gic-v3-its.c
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@@ -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++;