diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2017-06-26 04:28:04 -0500 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-06-28 14:44:56 +0200 |
| commit | 84a21dbdef0b96d773599c33c2afbb002198d303 (patch) | |
| tree | e6056e1911ed1f54c808f99937d41bcae2088488 | |
| parent | 7304e8f28bb2f3cb2baf37c1bb2caa0f54ca4e43 (diff) | |
| download | linux-84a21dbdef0b96d773599c33c2afbb002198d303.tar.bz2 | |
iommu/amd: Fix interrupt remapping when disable guest_mode
Pass-through devices to VM guest can get updated IRQ affinity
information via irq_set_affinity() when not running in guest mode.
Currently, AMD IOMMU driver in GA mode ignores the updated information
if the pass-through device is setup to use vAPIC regardless of guest_mode.
This could cause invalid interrupt remapping.
Also, the guest_mode bit should be set and cleared only when
SVM updates posted-interrupt interrupt remapping information.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Joerg Roedel <jroedel@suse.de>
Fixes: d98de49a53e48 ('iommu/amd: Enable vAPIC interrupt remapping mode by default')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 63cacf5d6cf2..0f1219fa8561 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -3879,11 +3879,9 @@ static void irte_ga_prepare(void *entry, 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 = 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; @@ -3939,10 +3937,10 @@ static void irte_ga_set_affinity(void *entry, u16 devid, u16 index, struct irte_ga *irte = (struct irte_ga *) entry; struct iommu_dev_data *dev_data = search_dev_data(devid); - if (!dev_data || !dev_data->use_vapic) { + if (!dev_data || !dev_data->use_vapic || + !irte->lo.fields_remap.guest_mode) { 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); } } |