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From: Maxim Levitsky <>
Cc: "open list:AMD IOMMU AMD-VI" <>,
	Maxim Levitsky <>,
	Joao Martins <>
Subject: [PATCH] iommu/amd: fix interrupt remapping for avic
Date: Sun, 13 Sep 2020 15:42:11 +0300	[thread overview]
Message-ID: <> (raw)

Commit e52d58d54a32 ("iommu/amd: Use cmpxchg_double() when updating 128-bit IRTE")
accidentally removed an assumption that modify_irte_ga always set the valid bit
and amd_iommu_activate_guest_mode relied on that.

Side effect of this is that on my machine, VFIO based VMs with AVIC enabled
would eventually crash and show IOMMU errors like that:

AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0055 address=0xfffffffdf8000000 flags=0x0008]

Fixes: e52d58d54a321 ("iommu/amd: Use cmpxchg_double() when updating 128-bit IRTE")
Signed-off-by: Maxim Levitsky <>
 drivers/iommu/amd/iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 07ae8b93887e5..aff4cc1869356 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3853,6 +3853,7 @@ int amd_iommu_activate_guest_mode(void *data)
 	entry->hi.fields.ga_root_ptr       = ir_data->ga_root_ptr;
 	entry->hi.fields.vector            = ir_data->ga_vector;
 	entry->lo.fields_vapic.ga_tag      = ir_data->ga_tag;
+	entry->lo.fields_remap.valid = 1;
 	return modify_irte_ga(ir_data->irq_2_irte.devid,
 			      ir_data->irq_2_irte.index, entry, ir_data);

iommu mailing list

             reply	other threads:[~2020-09-13 15:20 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-13 12:42 Maxim Levitsky [this message]
2020-09-14 14:48 ` Suravee Suthikulpanit
2020-09-15 11:25   ` Maxim Levitsky
2020-09-15 12:30     ` Suravee Suthikulpanit
2020-09-15 13:19       ` Joao Martins
2020-09-16 10:38         ` Suravee Suthikulpanit

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