iommu/amd: Enable vAPIC interrupt remapping mode by default
Introduce struct iommu_dev_data.use_vapic flag, which IOMMU driver
uses to determine if it should enable vAPIC support, by setting
the ga_mode bit in the device's interrupt remapping table entry.
Currently, it is enabled for all pass-through device if vAPIC mode
is enabled.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 69fc57e..a7aa0e7 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -137,6 +137,7 @@
bool pri_tlp; /* PASID TLB required for
PPR completions */
u32 errata; /* Bitmap for errata to apply */
+ bool use_vapic; /* Enable device to use vapic mode */
};
/*
@@ -3015,6 +3016,12 @@
if (!iommu)
return;
+#ifdef CONFIG_IRQ_REMAP
+ if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) &&
+ (dom->type == IOMMU_DOMAIN_UNMANAGED))
+ dev_data->use_vapic = 0;
+#endif
+
iommu_completion_wait(iommu);
}
@@ -3040,6 +3047,15 @@
ret = attach_device(dev, domain);
+#ifdef CONFIG_IRQ_REMAP
+ if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
+ if (dom->type == IOMMU_DOMAIN_UNMANAGED)
+ dev_data->use_vapic = 1;
+ else
+ dev_data->use_vapic = 0;
+ }
+#endif
+
iommu_completion_wait(iommu);
return ret;
@@ -3801,7 +3817,7 @@
static void irte_prepare(void *entry,
u32 delivery_mode, u32 dest_mode,
- u8 vector, u32 dest_apicid)
+ u8 vector, u32 dest_apicid, int devid)
{
union irte *irte = (union irte *) entry;
@@ -3815,13 +3831,14 @@
static void irte_ga_prepare(void *entry,
u32 delivery_mode, u32 dest_mode,
- u8 vector, u32 dest_apicid)
+ u8 vector, u32 dest_apicid, int devid)
{
struct irte_ga *irte = (struct irte_ga *) entry;
+ struct iommu_dev_data *dev_data = search_dev_data(devid);
irte->lo.val = 0;
irte->hi.val = 0;
- irte->lo.fields_remap.guest_mode = 0;
+ irte->lo.fields_remap.guest_mode = dev_data ? dev_data->use_vapic : 0;
irte->lo.fields_remap.int_type = delivery_mode;
irte->lo.fields_remap.dm = dest_mode;
irte->hi.fields.vector = vector;
@@ -3875,11 +3892,14 @@
u8 vector, u32 dest_apicid)
{
struct irte_ga *irte = (struct irte_ga *) entry;
+ struct iommu_dev_data *dev_data = search_dev_data(devid);
- irte->hi.fields.vector = vector;
- irte->lo.fields_remap.destination = dest_apicid;
- irte->lo.fields_remap.guest_mode = 0;
- modify_irte_ga(devid, index, irte, NULL);
+ if (!dev_data || !dev_data->use_vapic) {
+ irte->hi.fields.vector = vector;
+ irte->lo.fields_remap.destination = dest_apicid;
+ irte->lo.fields_remap.guest_mode = 0;
+ modify_irte_ga(devid, index, irte, NULL);
+ }
}
#define IRTE_ALLOCATED (~1U)
@@ -4022,7 +4042,7 @@
data->irq_2_irte.index = index + sub_handle;
iommu->irte_ops->prepare(data->entry, apic->irq_delivery_mode,
apic->irq_dest_mode, irq_cfg->vector,
- irq_cfg->dest_apicid);
+ irq_cfg->dest_apicid, devid);
switch (info->type) {
case X86_IRQ_ALLOC_TYPE_IOAPIC:
@@ -4222,6 +4242,14 @@
struct amd_ir_data *ir_data = data->chip_data;
struct irte_ga *irte = (struct irte_ga *) ir_data->entry;
struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
+ struct iommu_dev_data *dev_data = search_dev_data(irte_info->devid);
+
+ /* Note:
+ * This device has never been set up for guest mode.
+ * we should not modify the IRTE
+ */
+ if (!dev_data || !dev_data->use_vapic)
+ return 0;
pi_data->ir_data = ir_data;
