* [PATCH v2] iommu/amd: Fix interrupt remapping when disable guest_mode
@ 2017-06-26 9:28 Suravee Suthikulpanit
2017-06-28 9:07 ` Joerg Roedel
2017-06-28 12:44 ` Joerg Roedel
0 siblings, 2 replies; 4+ messages in thread
From: Suravee Suthikulpanit @ 2017-06-26 9:28 UTC (permalink / raw)
To: iommu, linux-kernel; +Cc: joro, Suravee Suthikulpanit, Joerg Roedel
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>
---
Changes in v2:
* Fix compiler warning of unused variable 'dev_data' in
irte_ga_prepare().
drivers/iommu/amd_iommu.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b17536d6..3f25d88 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);
}
}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2] iommu/amd: Fix interrupt remapping when disable guest_mode
2017-06-26 9:28 [PATCH v2] iommu/amd: Fix interrupt remapping when disable guest_mode Suravee Suthikulpanit
@ 2017-06-28 9:07 ` Joerg Roedel
2017-06-28 12:44 ` Joerg Roedel
1 sibling, 0 replies; 4+ messages in thread
From: Joerg Roedel @ 2017-06-28 9:07 UTC (permalink / raw)
To: Suravee Suthikulpanit; +Cc: iommu, linux-kernel, Joerg Roedel
Hi Suravee,
On Mon, Jun 26, 2017 at 04:28:04AM -0500, Suravee Suthikulpanit wrote:
> 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>
Can you please provide a 'Fixes:' tag too? No need to resend the whole
patch, just reply with the tag and I'll add it when applying this patch.
Thanks,
Joerg
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2] iommu/amd: Fix interrupt remapping when disable guest_mode
2017-06-26 9:28 [PATCH v2] iommu/amd: Fix interrupt remapping when disable guest_mode Suravee Suthikulpanit
2017-06-28 9:07 ` Joerg Roedel
@ 2017-06-28 12:44 ` Joerg Roedel
2017-06-29 3:27 ` Suravee Suthikulpanit
1 sibling, 1 reply; 4+ messages in thread
From: Joerg Roedel @ 2017-06-28 12:44 UTC (permalink / raw)
To: Suravee Suthikulpanit; +Cc: iommu, linux-kernel, Joerg Roedel
On Mon, Jun 26, 2017 at 04:28:04AM -0500, Suravee Suthikulpanit wrote:
> 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>
Nervermind, I added this fixes line and applied the patch:
Fixes: d98de49a53e48 ('iommu/amd: Enable vAPIC interrupt remapping mode by default'
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2] iommu/amd: Fix interrupt remapping when disable guest_mode
2017-06-28 12:44 ` Joerg Roedel
@ 2017-06-29 3:27 ` Suravee Suthikulpanit
0 siblings, 0 replies; 4+ messages in thread
From: Suravee Suthikulpanit @ 2017-06-29 3:27 UTC (permalink / raw)
To: Joerg Roedel; +Cc: iommu, linux-kernel, Joerg Roedel
On 6/28/17 19:44, Joerg Roedel wrote:
> On Mon, Jun 26, 2017 at 04:28:04AM -0500, Suravee Suthikulpanit wrote:
>> 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>
>
> Nervermind, I added this fixes line and applied the patch:
>
> Fixes: d98de49a53e48 ('iommu/amd: Enable vAPIC interrupt remapping mode by default'
>
Thanks,
Suravee
^ permalink raw reply [flat|nested] 4+ messages in thread
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2017-06-26 9:28 [PATCH v2] iommu/amd: Fix interrupt remapping when disable guest_mode Suravee Suthikulpanit
2017-06-28 9:07 ` Joerg Roedel
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