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iommu/amd: Fix IOMMU AVIC not properly update the is_run bit in IRTE

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commit 730ad0ede130015a773229573559e97ba0943065 upstream.

Commit b9c6ff94e4 ("iommu/amd: Re-factor guest virtual APIC
(de-)activation code") accidentally left out the ir_data pointer when
calling modity_irte_ga(), which causes the function amd_iommu_update_ga()
to return prematurely due to struct amd_ir_data.ref is NULL and
the "is_run" bit of IRTE does not get updated properly.

This results in bad I/O performance since IOMMU AVIC always generate GA Log
entry and notify IOMMU driver and KVM when it receives interrupt from the
PCI pass-through device instead of directly inject interrupt to the vCPU.

Fixes by passing ir_data when calling modify_irte_ga() as done previously.

Fixes: b9c6ff94e4 ("iommu/amd: Re-factor guest virtual APIC (de-)activation code")
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suravee Suthikulpanit 2020-03-12 05:18:39 -05:00 • committed by Greg Kroah-Hartman
commit 62fd4e348d
1 changed files with 2 additions and 2 deletions
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4
drivers/iommu/amd_iommu.c
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@ -4421,7 +4421,7 @@ int amd_iommu_activate_guest_mode(void *data)
entry->lo.fields_vapic.ga_tag = ir_data->ga_tag;
return modify_irte_ga(ir_data->irq_2_irte.devid,
ir_data->irq_2_irte.index, entry, NULL);
ir_data->irq_2_irte.index, entry, ir_data);
}
EXPORT_SYMBOL(amd_iommu_activate_guest_mode);
@ -4447,7 +4447,7 @@ int amd_iommu_deactivate_guest_mode(void *data)
APICID_TO_IRTE_DEST_HI(cfg->dest_apicid);
return modify_irte_ga(ir_data->irq_2_irte.devid,
ir_data->irq_2_irte.index, entry, NULL);
ir_data->irq_2_irte.index, entry, ir_data);
}
EXPORT_SYMBOL(amd_iommu_deactivate_guest_mode);