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charset="utf-8" vintf->hyp_own is finalized in tegra241_vintf_hw_init(). On the other hand, tegra241_vcmdq_alloc_smmu_cmdq() is called via an init_structures callback, which is earlier than tegra241_vintf_hw_init(). This results in the supports_cmd op always being set to the guest function, although this doesn't break any functionality nor have some noticeable perf impact since non-invalidation commands are not issued in the perf sensitive context. Fix this by moving supports_cmd to tegra241_vcmdq_hw_init(). After this change, - For a guest kernel, this will be a status quo - For a host kernel, non-invalidation commands will be issued to VCMDQ(s) Fixes: a9d40285bdef ("iommu/tegra241-cmdqv: Limit CMDs for VCMDQs of a gues= t owned VINTF") Reported-by: Eric Auger Reported-by: Shameer Kolothum Closes: https://lore.kernel.org/qemu-devel/CH3PR12MB754836BEE54E39B30C7210C= 0AB44A@CH3PR12MB7548.namprd12.prod.outlook.com/ Signed-off-by: Nicolin Chen Reviewed-by: Eric Auger --- drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c b/drivers/iommu= /arm/arm-smmu-v3/tegra241-cmdqv.c index 6fe5563eaf9eb..83f6e9f6c51d6 100644 --- a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c +++ b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c @@ -479,6 +479,10 @@ static int tegra241_vcmdq_hw_init(struct tegra241_vcmd= q *vcmdq) /* Reset VCMDQ */ tegra241_vcmdq_hw_deinit(vcmdq); =20 + /* vintf->hyp_own is a HW state finalized in tegra241_vintf_hw_init() */ + if (!vcmdq->vintf->hyp_own) + vcmdq->cmdq.supports_cmd =3D tegra241_guest_vcmdq_supports_cmd; + /* Configure and enable VCMDQ */ writeq_relaxed(vcmdq->cmdq.q.q_base, REG_VCMDQ_PAGE1(vcmdq, BASE)); =20 @@ -639,9 +643,6 @@ static int tegra241_vcmdq_alloc_smmu_cmdq(struct tegra2= 41_vcmdq *vcmdq) q->q_base =3D q->base_dma & VCMDQ_ADDR; q->q_base |=3D FIELD_PREP(VCMDQ_LOG2SIZE, q->llq.max_n_shift); =20 - if (!vcmdq->vintf->hyp_own) - cmdq->supports_cmd =3D tegra241_guest_vcmdq_supports_cmd; - return arm_smmu_cmdq_init(smmu, cmdq); } =20 --=20 2.43.0 From nobody Tue Apr 7 13:06:53 2026 Received: from SN4PR0501CU005.outbound.protection.outlook.com (mail-southcentralusazon11011006.outbound.protection.outlook.com [40.93.194.6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 266E92D061D; Fri, 13 Mar 2026 00:37:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.93.194.6 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773362236; 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charset="utf-8" From hardware implementation perspective, a guest tegra241-cmdqv hardware is different than the host hardware: - Host HW is backed by a VINTF (HYP_OWN=3D1) - Guest HW is backed by a VINTF (HYP_OWN=3D0) The kernel driver has an implementation requirement of the HYP_OWN bit in the VM. So, VMM must follow that to allow the same copy of Linux to work. Add this requirement to the uAPI, which is currently missing. Fixes: 4dc0d12474f9 ("iommu/tegra241-cmdqv: Add user-space use support") Signed-off-by: Nicolin Chen Reviewed-by: Eric Auger Reviewed-by: Jason Gunthorpe --- include/uapi/linux/iommufd.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 1dafbc552d37d..f63edbe71d542 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -1052,6 +1052,11 @@ struct iommu_fault_alloc { enum iommu_viommu_type { IOMMU_VIOMMU_TYPE_DEFAULT =3D 0, IOMMU_VIOMMU_TYPE_ARM_SMMUV3 =3D 1, + /* + * TEGRA241_CMDQV requirements (otherwise, VCMDQs will not work) + * - Kernel will allocate a VINTF (HYP_OWN=3D0) to back this VIOMMU. So, + * VMM must wire the HYP_OWN bit to 0 in guest VINTF_CONFIG register + */ IOMMU_VIOMMU_TYPE_TEGRA241_CMDQV =3D 2, }; =20 --=20 2.43.0