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iommu/amd: Introduce amd_iommu_update_ga()

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Introduces a new IOMMU API, amd_iommu_update_ga(), which allows
KVM (SVM) to update existing posted interrupt IOMMU IRTE when
load/unload vcpu.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Suravee Suthikulpanit 2016-08-23 13:52:38 -05:00 committed by Joerg Roedel
parent bd6fcefc66
commit 8dbea3fd7b
3 changed files with 49 additions and 0 deletions
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39
drivers/iommu/amd_iommu.c
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@ -4269,4 +4269,43 @@ int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
return 0;
}
int amd_iommu_update_ga(int cpu, bool is_run, void *data)
{
unsigned long flags;
struct amd_iommu *iommu;
struct irq_remap_table *irt;
struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
int devid = ir_data->irq_2_irte.devid;
struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
struct irte_ga *ref = (struct irte_ga *) ir_data->ref;
if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
!ref || !entry || !entry->lo.fields_vapic.guest_mode)
return 0;
iommu = amd_iommu_rlookup_table[devid];
if (!iommu)
return -ENODEV;
irt = get_irq_table(devid, false);
if (!irt)
return -ENODEV;
spin_lock_irqsave(&irt->lock, flags);
if (ref->lo.fields_vapic.guest_mode) {
if (cpu >= 0)
ref->lo.fields_vapic.destination = cpu;
ref->lo.fields_vapic.is_run = is_run;
barrier();
}
spin_unlock_irqrestore(&irt->lock, flags);
iommu_flush_irt(iommu, devid);
iommu_completion_wait(iommu);
return 0;
}
EXPORT_SYMBOL(amd_iommu_update_ga);
#endif

1
drivers/iommu/amd_iommu_types.h
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@ -810,6 +810,7 @@ struct amd_ir_data {
struct irq_2_irte irq_2_irte;
struct msi_msg msi_entry;
void *entry; /* Pointer to union irte or struct irte_ga */
void *ref; /* Pointer to the actual irte */
};
struct amd_irte_ops {

9
include/linux/amd-iommu.h
View File

@ -179,6 +179,9 @@ static inline int amd_iommu_detect(void) { return -ENODEV; }
/* IOMMU AVIC Function */
extern int amd_iommu_register_ga_log_notifier(int (*notifier)(u32));
extern int
amd_iommu_update_ga(int cpu, bool is_run, void *data);
#else /* defined(CONFIG_AMD_IOMMU) && defined(CONFIG_IRQ_REMAP) */
static inline int
@ -187,6 +190,12 @@ amd_iommu_register_ga_log_notifier(int (*notifier)(u32))
return 0;
}
static inline int
amd_iommu_update_ga(int cpu, bool is_run, void *data)
{
return 0;
}
#endif /* defined(CONFIG_AMD_IOMMU) && defined(CONFIG_IRQ_REMAP) */
#endif /* _ASM_X86_AMD_IOMMU_H */