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dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C From: Shameer Kolothum To: , CC: , , , , , , , , , , , , , , , Subject: [PATCH v5 14/32] hw/arm/smmuv3-accel: Install SMMUv3 GBPA based hwpt Date: Fri, 31 Oct 2025 10:49:47 +0000 Message-ID: <20251031105005.24618-15-skolothumtho@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251031105005.24618-1-skolothumtho@nvidia.com> References: <20251031105005.24618-1-skolothumtho@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.126.231.35] X-ClientProxiedBy: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE36:EE_|DS2PR12MB9614:EE_ X-MS-Office365-Filtering-Correlation-Id: 240fb212-9f89-40fc-f6c8-08de186bc5fd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="utf-8" When the Guest reboots or updates the GBPA we need to attach a nested HWPT based on the GBPA register values. Signed-off-by: Shameer Kolothum Reviewed-by: Eric Auger --- hw/arm/smmuv3-accel.c | 42 ++++++++++++++++++++++++++++++++++++++++++ hw/arm/smmuv3-accel.h | 8 ++++++++ hw/arm/smmuv3.c | 2 ++ 3 files changed, 52 insertions(+) diff --git a/hw/arm/smmuv3-accel.c b/hw/arm/smmuv3-accel.c index c74e95a0ea..0573ae3772 100644 --- a/hw/arm/smmuv3-accel.c +++ b/hw/arm/smmuv3-accel.c @@ -479,6 +479,48 @@ static const PCIIOMMUOps smmuv3_accel_ops =3D { .unset_iommu_device =3D smmuv3_accel_unset_iommu_device, }; =20 + +/* Based on SMUUv3 GBPA configuration, attach a corresponding HWPT */ +void smmuv3_accel_gbpa_update(SMMUv3State *s) +{ + SMMUv3AccelDevice *accel_dev; + Error *local_err =3D NULL; + SMMUViommu *vsmmu; + uint32_t hwpt_id; + + if (!s->accel || !s->s_accel->vsmmu) { + return; + } + + vsmmu =3D s->s_accel->vsmmu; + /* + * The Linux kernel does not allow configuring GBPA MemAttr, MTCFG, + * ALLOCCFG, SHCFG, PRIVCFG, or INSTCFG fields for a vSTE. Host kernel + * has final control over these parameters. Hence, use one of the + * pre-allocated HWPTs depending on GBPA.ABORT value. + */ + if (s->gbpa & SMMU_GBPA_ABORT) { + hwpt_id =3D vsmmu->abort_hwpt_id; + } else { + hwpt_id =3D vsmmu->bypass_hwpt_id; + } + + QLIST_FOREACH(accel_dev, &vsmmu->device_list, next) { + if (!host_iommu_device_iommufd_attach_hwpt(accel_dev->idev, hwpt_i= d, + &local_err)) { + error_append_hint(&local_err, "Failed to attach GBPA hwpt id %= u " + "for dev id %u", hwpt_id, accel_dev->idev->d= evid); + error_report_err(local_err); + } + } +} + +void smmuv3_accel_reset(SMMUv3State *s) +{ + /* Attach a HWPT based on GBPA reset value */ + smmuv3_accel_gbpa_update(s); +} + static void smmuv3_accel_as_init(SMMUv3State *s) { =20 diff --git a/hw/arm/smmuv3-accel.h b/hw/arm/smmuv3-accel.h index 73b44cd7be..8931e83dc5 100644 --- a/hw/arm/smmuv3-accel.h +++ b/hw/arm/smmuv3-accel.h @@ -51,6 +51,8 @@ bool smmuv3_accel_install_nested_ste(SMMUv3State *s, SMMU= Device *sdev, int sid, Error **errp); bool smmuv3_accel_install_nested_ste_range(SMMUv3State *s, SMMUSIDRange *r= ange, Error **errp); +void smmuv3_accel_gbpa_update(SMMUv3State *s); +void smmuv3_accel_reset(SMMUv3State *s); #else static inline void smmuv3_accel_init(SMMUv3State *s) { @@ -67,6 +69,12 @@ smmuv3_accel_install_nested_ste_range(SMMUv3State *s, SM= MUSIDRange *range, { return true; } +static inline void smmuv3_accel_gbpa_update(SMMUv3State *s) +{ +} +static inline void smmuv3_accel_reset(SMMUv3State *s) +{ +} #endif =20 #endif /* HW_ARM_SMMUV3_ACCEL_H */ diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c index 1fd8aaa0c7..cc32b618ed 100644 --- a/hw/arm/smmuv3.c +++ b/hw/arm/smmuv3.c @@ -1603,6 +1603,7 @@ static MemTxResult smmu_writel(SMMUv3State *s, hwaddr= offset, if (data & R_GBPA_UPDATE_MASK) { /* Ignore update bit as write is synchronous. */ s->gbpa =3D data & ~R_GBPA_UPDATE_MASK; + smmuv3_accel_gbpa_update(s); } return MEMTX_OK; case A_STRTAB_BASE: /* 64b */ @@ -1885,6 +1886,7 @@ static void smmu_reset_exit(Object *obj, ResetType ty= pe) } =20 smmuv3_init_regs(s); + smmuv3_accel_reset(s); } =20 static void smmu_realize(DeviceState *d, Error **errp) --=20 2.43.0