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Fri, 3 Jul 2020 06:08:21 +0000 From: "Liu, Yi L" To: Alex Williamson CC: "eric.auger@redhat.com" , "baolu.lu@linux.intel.com" , "joro@8bytes.org" , "Tian, Kevin" , "jacob.jun.pan@linux.intel.com" , "Raj, Ashok" , "Tian, Jun J" , "Sun, Yi Y" , "jean-philippe@linaro.org" , "peterx@redhat.com" , "Wu, Hao" , "iommu@lists.linux-foundation.org" , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH v3 04/14] vfio: Add PASID allocation/free support Thread-Topic: [PATCH v3 04/14] vfio: Add PASID allocation/free support Thread-Index: AQHWSgRR5bz4tOM/oUaIsA0C5MG6Daj02DkAgACTvOA= Date: Fri, 3 Jul 2020 06:08:21 +0000 Message-ID: References: <1592988927-48009-1-git-send-email-yi.l.liu@intel.com> <1592988927-48009-5-git-send-email-yi.l.liu@intel.com> <20200702151702.1baa65cb@x1.home> In-Reply-To: <20200702151702.1baa65cb@x1.home> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-reaction: no-action dlp-version: 11.2.0.6 dlp-product: dlpe-windows authentication-results: redhat.com; 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x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CY4PR11MB1432.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c921a38e-d5c2-4954-8f00-08d81f177d4f X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Jul 2020 06:08:21.8040 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Lg4ROJlbblHXYopkqpbL8chNyxiJ7NERmw9NnLCTDZysFKb2fSVIH1Zxi+OqmneqyTODRRsq423BYcDH9BJHcQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR11MB1784 X-OriginatorOrg: intel.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Alex, > From: Alex Williamson > Sent: Friday, July 3, 2020 5:17 AM >=20 > On Wed, 24 Jun 2020 01:55:17 -0700 > Liu Yi L wrote: >=20 > > Shared Virtual Addressing (a.k.a Shared Virtual Memory) allows sharing > > multiple process virtual address spaces with the device for simplified > > programming model. PASID is used to tag an virtual address space in > > DMA requests and to identify the related translation structure in > > IOMMU. When a PASID-capable device is assigned to a VM, we want the > > same capability of using PASID to tag guest process virtual address > > spaces to achieve virtual SVA (vSVA). > > > > PASID management for guest is vendor specific. Some vendors (e.g. > > Intel > > VT-d) requires system-wide managed PASIDs cross all devices, > > regardless of whether a device is used by host or assigned to guest. > > Other vendors (e.g. ARM SMMU) may allow PASIDs managed per-device thus > > could be fully delegated to the guest for assigned devices. > > > > For system-wide managed PASIDs, this patch introduces a vfio module to > > handle explicit PASID alloc/free requests from guest. Allocated PASIDs > > are associated to a process (or, mm_struct) in IOASID core. A vfio_mm > > object is introduced to track mm_struct. Multiple VFIO containers > > within a process share the same vfio_mm object. > > > > A quota mechanism is provided to prevent malicious user from > > exhausting available PASIDs. Currently the quota is a global parameter > > applied to all VFIO devices. In the future per-device quota might be su= pported > too. > > > > Cc: Kevin Tian > > CC: Jacob Pan > > Cc: Eric Auger > > Cc: Jean-Philippe Brucker > > Cc: Joerg Roedel > > Cc: Lu Baolu > > Suggested-by: Alex Williamson > > Signed-off-by: Liu Yi L > > --- > > v1 -> v2: > > *) added in v2, split from the pasid alloc/free support of v1 > > --- > > drivers/vfio/Kconfig | 5 ++ > > drivers/vfio/Makefile | 1 + > > drivers/vfio/vfio_pasid.c | 151 > ++++++++++++++++++++++++++++++++++++++++++++++ > > include/linux/vfio.h | 28 +++++++++ > > 4 files changed, 185 insertions(+) > > create mode 100644 drivers/vfio/vfio_pasid.c > > > > diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig index > > fd17db9..3d8a108 100644 > > --- a/drivers/vfio/Kconfig > > +++ b/drivers/vfio/Kconfig > > @@ -19,6 +19,11 @@ config VFIO_VIRQFD > > depends on VFIO && EVENTFD > > default n > > > > +config VFIO_PASID > > + tristate > > + depends on IOASID && VFIO > > + default n > > + > > menuconfig VFIO > > tristate "VFIO Non-Privileged userspace driver framework" > > depends on IOMMU_API > > diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile index > > de67c47..bb836a3 100644 > > --- a/drivers/vfio/Makefile > > +++ b/drivers/vfio/Makefile > > @@ -3,6 +3,7 @@ vfio_virqfd-y :=3D virqfd.o > > > > obj-$(CONFIG_VFIO) +=3D vfio.o > > obj-$(CONFIG_VFIO_VIRQFD) +=3D vfio_virqfd.o > > +obj-$(CONFIG_VFIO_PASID) +=3D vfio_pasid.o > > obj-$(CONFIG_VFIO_IOMMU_TYPE1) +=3D vfio_iommu_type1.o > > obj-$(CONFIG_VFIO_IOMMU_SPAPR_TCE) +=3D vfio_iommu_spapr_tce.o > > obj-$(CONFIG_VFIO_SPAPR_EEH) +=3D vfio_spapr_eeh.o diff --git > > a/drivers/vfio/vfio_pasid.c b/drivers/vfio/vfio_pasid.c new file mode > > 100644 index 0000000..dd5b6d1 > > --- /dev/null > > +++ b/drivers/vfio/vfio_pasid.c > > @@ -0,0 +1,151 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* > > + * Copyright (C) 2020 Intel Corporation. > > + * Author: Liu Yi L > > + * > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#define DRIVER_VERSION "0.1" > > +#define DRIVER_AUTHOR "Liu Yi L " > > +#define DRIVER_DESC "PASID management for VFIO bus drivers" > > + > > +#define VFIO_DEFAULT_PASID_QUOTA 1000 > > +static int pasid_quota =3D VFIO_DEFAULT_PASID_QUOTA; > > +module_param_named(pasid_quota, pasid_quota, uint, 0444); > > +MODULE_PARM_DESC(pasid_quota, > > + " Set the quota for max number of PASIDs that an application is > > +allowed to request (default 1000)"); > > + > > +struct vfio_mm_token { > > + unsigned long long val; > > +}; > > + > > +struct vfio_mm { > > + struct kref kref; > > + struct vfio_mm_token token; > > + int ioasid_sid; > > + int pasid_quota; > > + struct list_head next; > > +}; > > + > > +static struct vfio_pasid { > > + struct mutex vfio_mm_lock; > > + struct list_head vfio_mm_list; > > +} vfio_pasid; > > + > > +/* called with vfio.vfio_mm_lock held */ static void > > +vfio_mm_release(struct kref *kref) { > > + struct vfio_mm *vmm =3D container_of(kref, struct vfio_mm, kref); > > + > > + list_del(&vmm->next); > > + mutex_unlock(&vfio_pasid.vfio_mm_lock); > > + ioasid_free_set(vmm->ioasid_sid, true); > > + kfree(vmm); > > +} > > + > > +void vfio_mm_put(struct vfio_mm *vmm) { > > + kref_put_mutex(&vmm->kref, vfio_mm_release, > > +&vfio_pasid.vfio_mm_lock); } > > + > > +static void vfio_mm_get(struct vfio_mm *vmm) { > > + kref_get(&vmm->kref); > > +} > > + > > +struct vfio_mm *vfio_mm_get_from_task(struct task_struct *task) { > > + struct mm_struct *mm =3D get_task_mm(task); > > + struct vfio_mm *vmm; > > + unsigned long long val =3D (unsigned long long) mm; > > + int ret; > > + > > + mutex_lock(&vfio_pasid.vfio_mm_lock); > > + /* Search existing vfio_mm with current mm pointer */ > > + list_for_each_entry(vmm, &vfio_pasid.vfio_mm_list, next) { > > + if (vmm->token.val =3D=3D val) { > > + vfio_mm_get(vmm); > > + goto out; > > + } > > + } > > + > > + vmm =3D kzalloc(sizeof(*vmm), GFP_KERNEL); > > + if (!vmm) > > + return ERR_PTR(-ENOMEM); >=20 > lock leaked, mm leaked. oh, yes. silly mistake. > > + > > + /* > > + * IOASID core provides a 'IOASID set' concept to track all > > + * PASIDs associated with a token. Here we use mm_struct as > > + * the token and create a IOASID set per mm_struct. All the > > + * containers of the process share the same IOASID set. > > + */ > > + ret =3D ioasid_alloc_set((struct ioasid_set *) mm, pasid_quota, > > + &vmm->ioasid_sid); > > + if (ret) { > > + kfree(vmm); > > + return ERR_PTR(ret); >=20 > lock leaked, mm leaked. got it. > > + } > > + > > + kref_init(&vmm->kref); > > + vmm->token.val =3D (unsigned long long) mm; >=20 > We already have it in @val. yep, let me use val directly. > > + vmm->pasid_quota =3D pasid_quota; >=20 > This field on the structure and this assignment seems to serve no purpose= . yeah, it's used in prior version. let me drop it. if we still want it, may = add later. > Thanks, >=20 > Alex >=20 > > + > > + list_add(&vmm->next, &vfio_pasid.vfio_mm_list); > > +out: > > + mutex_unlock(&vfio_pasid.vfio_mm_lock); > > + mmput(mm); > > + return vmm; > > +} > > + > > +int vfio_pasid_alloc(struct vfio_mm *vmm, int min, int max) { > > + ioasid_t pasid; > > + > > + pasid =3D ioasid_alloc(vmm->ioasid_sid, min, max, NULL); > > + > > + return (pasid =3D=3D INVALID_IOASID) ? -ENOSPC : pasid; } > > + > > +void vfio_pasid_free_range(struct vfio_mm *vmm, > > + ioasid_t min, ioasid_t max) > > +{ > > + ioasid_t pasid =3D min; > > + > > + if (min > max) > > + return; > > + > > + /* > > + * IOASID core will notify PASID users (e.g. IOMMU driver) to > > + * teardown necessary structures depending on the to-be-freed > > + * PASID. > > + */ > > + for (; pasid <=3D max; pasid++) > > + ioasid_free(pasid); > > +} > > + > > +static int __init vfio_pasid_init(void) { > > + mutex_init(&vfio_pasid.vfio_mm_lock); > > + INIT_LIST_HEAD(&vfio_pasid.vfio_mm_list); > > + return 0; > > +} > > + > > +static void __exit vfio_pasid_exit(void) { > > + WARN_ON(!list_empty(&vfio_pasid.vfio_mm_list)); > > +} > > + > > +module_init(vfio_pasid_init); > > +module_exit(vfio_pasid_exit); > > + > > +MODULE_VERSION(DRIVER_VERSION); > > +MODULE_LICENSE("GPL v2"); > > +MODULE_AUTHOR(DRIVER_AUTHOR); > > +MODULE_DESCRIPTION(DRIVER_DESC); > > diff --git a/include/linux/vfio.h b/include/linux/vfio.h index > > 38d3c6a..74e077d 100644 > > --- a/include/linux/vfio.h > > +++ b/include/linux/vfio.h > > @@ -97,6 +97,34 @@ extern int vfio_register_iommu_driver(const struct > > vfio_iommu_driver_ops *ops); extern void vfio_unregister_iommu_driver( > > const struct vfio_iommu_driver_ops *ops); > > > > +struct vfio_mm; > > +#if IS_ENABLED(CONFIG_VFIO_PASID) > > +extern struct vfio_mm *vfio_mm_get_from_task(struct task_struct > > +*task); extern void vfio_mm_put(struct vfio_mm *vmm); extern int > > +vfio_pasid_alloc(struct vfio_mm *vmm, int min, int max); extern void > > +vfio_pasid_free_range(struct vfio_mm *vmm, > > + ioasid_t min, ioasid_t max); > > +#else > > +static inline struct vfio_mm *vfio_mm_get_from_task(struct > > +task_struct *task) { > > + return NULL; > > +} > > + > > +static inline void vfio_mm_put(struct vfio_mm *vmm) { } > > + > > +static inline int vfio_pasid_alloc(struct vfio_mm *vmm, int min, int > > +max) { > > + return -ENOTTY; > > +} > > + > > +static inline void vfio_pasid_free_range(struct vfio_mm *vmm, > > + ioasid_t min, ioasid_t max) > > +{ > > +} > > +#endif /* CONFIG_VFIO_PASID */ > > + > > /* > > * External user API > > */