This is a note to let you know that I've just added the patch titled iommu/amd: Restore IRTE.RemapEn bit after programming IRTE to the 5.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iommu-amd-restore-irte.remapen-bit-after-programming.patch and it can be found in the queue-5.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit c3951941e1e210489b837237dfbd3a0411a62510 Author: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> Date: Thu Sep 3 09:38:21 2020 +0000 iommu/amd: Restore IRTE.RemapEn bit after programming IRTE [ Upstream commit 26e495f341075c09023ba16dee9a7f37a021e745 ] Currently, the RemapEn (valid) bit is accidentally cleared when programming IRTE w/ guestMode=0. It should be restored to the prior state. Fixes: b9fc6b56f478 ("iommu/amd: Implements irq_set_vcpu_affinity() hook to setup vapic mode for pass-through devices") Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> Reviewed-by: Joao Martins <joao.m.martins@xxxxxxxxxx> Link: https://lore.kernel.org/r/20200903093822.52012-2-suravee.suthikulpanit@xxxxxxx Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 2f22326ee4dfe..d7b037891fb7e 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -3841,6 +3841,7 @@ 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; if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) || !entry || !entry->lo.fields_vapic.guest_mode) @@ -3849,6 +3850,7 @@ int amd_iommu_deactivate_guest_mode(void *data) entry->lo.val = 0; entry->hi.val = 0; + entry->lo.fields_remap.valid = valid; entry->lo.fields_remap.dm = apic->irq_dest_mode; entry->lo.fields_remap.int_type = apic->irq_delivery_mode; entry->hi.fields.vector = cfg->vector;