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| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2020-09-16 14:17:20 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2020-09-18 12:17:19 +0300 |
| commit | e97685abd5d711c885053d4949178f7ab9acbaef (patch) | |
| tree | cd93e24c8e9c84af9e8c72a5f15df21140a85acb /CREDITS | |
| parent | 14c4acc5ed22c21f9821103be7c48efdf9763584 (diff) | |
| download | linux-e97685abd5d711c885053d4949178f7ab9acbaef.tar.xz | |
iommu/amd: Restore IRTE.RemapEn bit for amd_iommu_activate_guest_mode
Commit e52d58d54a32 ("iommu/amd: Use cmpxchg_double() when updating
128-bit IRTE") removed an assumption that modify_irte_ga always set
the valid bit, which requires the callers to set the appropriate value
for the struct irte_ga.valid bit before calling the function.
Similar to the commit 26e495f34107 ("iommu/amd: Restore IRTE.RemapEn
bit after programming IRTE"), which is for the function
amd_iommu_deactivate_guest_mode().
The same change is also needed for the amd_iommu_activate_guest_mode().
Otherwise, this could trigger IO_PAGE_FAULT for the VFIO based VMs with
AVIC enabled.
Fixes: e52d58d54a321 ("iommu/amd: Use cmpxchg_double() when updating 128-bit IRTE")
Reported-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Tested-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/r/20200916111720.43913-1-suravee.suthikulpanit@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'CREDITS')
0 files changed, 0 insertions, 0 deletions