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IOMMU Fixes for Linux v5.9-rc5

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Two fixes for the AMD IOMMU driver:
 
 	- Fix a potential NULL-ptr dereference found by smatch
 
 	- Fix interrupt remapping when a device is assigned to a guest
 	  and AVIC is enabled.
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Merge tag 'iommu-fixes-v5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:
 "Two fixes for the AMD IOMMU driver:

   - Fix a potential NULL-ptr dereference found by smatch

   - Fix interrupt remapping when a device is assigned to a guest and
     AVIC is enabled"

* tag 'iommu-fixes-v5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/amd: Restore IRTE.RemapEn bit for amd_iommu_activate_guest_mode
  iommu/amd: Fix potential @entry null deref
This commit is contained in:
Linus Torvalds 2020-09-18 11:20:34 -07:00
commit 1fd79656f7
1 changed files with 7 additions and 1 deletions
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8
drivers/iommu/amd/iommu.c
View File

@ -3840,14 +3840,18 @@ int amd_iommu_activate_guest_mode(void *data)
{
struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
u64 valid;
if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
!entry || entry->lo.fields_vapic.guest_mode)
return 0;
valid = entry->lo.fields_vapic.valid;
entry->lo.val = 0;
entry->hi.val = 0;
entry->lo.fields_vapic.valid = valid;
entry->lo.fields_vapic.guest_mode = 1;
entry->lo.fields_vapic.ga_log_intr = 1;
entry->hi.fields.ga_root_ptr = ir_data->ga_root_ptr;
@ -3864,12 +3868,14 @@ int amd_iommu_deactivate_guest_mode(void *data)
struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
struct irq_cfg *cfg = ir_data->cfg;
u64 valid = entry->lo.fields_remap.valid;
u64 valid;
if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
!entry || !entry->lo.fields_vapic.guest_mode)
return 0;
valid = entry->lo.fields_remap.valid;
entry->lo.val = 0;
entry->hi.val = 0;