From: Auger Eric <eric.auger@redhat.com>
To: Keqian Zhu <zhukeqian1@huawei.com>,
eric.auger.pro@gmail.com, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, will@kernel.org, joro@8bytes.org,
maz@kernel.org, robin.murphy@arm.com, alex.williamson@redhat.com
Cc: jean-philippe@linaro.org, vivek.gautam@arm.com, zhangfei.gao@linaro.org
Subject: Re: [PATCH v11 01/13] vfio: VFIO_IOMMU_SET_PASID_TABLE
Date: Mon, 22 Feb 2021 11:53:38 +0100 [thread overview]
Message-ID: <e476f85d-f49f-f9a6-3232-e99a4cb5a0a2@redhat.com> (raw)
In-Reply-To: <84a111da-1969-1701-9a6d-cae8d7c285c6@huawei.com>
Hi Keqian,
On 2/2/21 1:34 PM, Keqian Zhu wrote:
> Hi Eric,
>
> On 2020/11/16 19:00, Eric Auger wrote:
>> From: "Liu, Yi L" <yi.l.liu@linux.intel.com>
>>
>> This patch adds an VFIO_IOMMU_SET_PASID_TABLE ioctl
>> which aims to pass the virtual iommu guest configuration
>> to the host. This latter takes the form of the so-called
>> PASID table.
>>
>> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
>> Signed-off-by: Liu, Yi L <yi.l.liu@linux.intel.com>
>> Signed-off-by: Eric Auger <eric.auger@redhat.com>
>>
>> ---
>> v11 -> v12:
>> - use iommu_uapi_set_pasid_table
>> - check SET and UNSET are not set simultaneously (Zenghui)
>>
>> v8 -> v9:
>> - Merge VFIO_IOMMU_ATTACH/DETACH_PASID_TABLE into a single
>> VFIO_IOMMU_SET_PASID_TABLE ioctl.
>>
>> v6 -> v7:
>> - add a comment related to VFIO_IOMMU_DETACH_PASID_TABLE
>>
>> v3 -> v4:
>> - restore ATTACH/DETACH
>> - add unwind on failure
>>
>> v2 -> v3:
>> - s/BIND_PASID_TABLE/SET_PASID_TABLE
>>
>> v1 -> v2:
>> - s/BIND_GUEST_STAGE/BIND_PASID_TABLE
>> - remove the struct device arg
>> ---
>> drivers/vfio/vfio_iommu_type1.c | 65 +++++++++++++++++++++++++++++++++
>> include/uapi/linux/vfio.h | 19 ++++++++++
>> 2 files changed, 84 insertions(+)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index 67e827638995..87ddd9e882dc 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -2587,6 +2587,41 @@ static int vfio_iommu_iova_build_caps(struct vfio_iommu *iommu,
>> return ret;
>> }
>>
>> +static void
>> +vfio_detach_pasid_table(struct vfio_iommu *iommu)
>> +{
>> + struct vfio_domain *d;
>> +
>> + mutex_lock(&iommu->lock);
>> + list_for_each_entry(d, &iommu->domain_list, next)
>> + iommu_detach_pasid_table(d->domain);
>> +
>> + mutex_unlock(&iommu->lock);
>> +}
>> +
>> +static int
>> +vfio_attach_pasid_table(struct vfio_iommu *iommu, unsigned long arg)
>> +{
>> + struct vfio_domain *d;
>> + int ret = 0;
>> +
>> + mutex_lock(&iommu->lock);
>> +
>> + list_for_each_entry(d, &iommu->domain_list, next) {
>> + ret = iommu_uapi_attach_pasid_table(d->domain, (void __user *)arg);
> This design is not very clear to me. This assumes all iommu_domains share the same pasid table.
>
> As I understand, it's reasonable when there is only one group in the domain, and only one domain in the vfio_iommu.
> If more than one group in the vfio_iommu, the guest may put them into different guest iommu_domain, then they have different pasid table.
>
> Is this the use scenario?
the vfio_iommu is attached to a container. all the groups within a
container share the same set of page tables (linux
Documentation/driver-api/vfio.rst). So to me if you want to use
different pasid tables, the groups need to be attached to different
containers. Does that make sense to you?
Thanks
Eric
>
> Thanks,
> Keqian
>
>> + if (ret)
>> + goto unwind;
>> + }
>> + goto unlock;
>> +unwind:
>> + list_for_each_entry_continue_reverse(d, &iommu->domain_list, next) {
>> + iommu_detach_pasid_table(d->domain);
>> + }
>> +unlock:
>> + mutex_unlock(&iommu->lock);
>> + return ret;
>> +}
>> +
>> static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,
>> struct vfio_info_cap *caps)
>> {
>> @@ -2747,6 +2782,34 @@ static int vfio_iommu_type1_unmap_dma(struct vfio_iommu *iommu,
>> -EFAULT : 0;
>> }
>>
>> +static int vfio_iommu_type1_set_pasid_table(struct vfio_iommu *iommu,
>> + unsigned long arg)
>> +{
>> + struct vfio_iommu_type1_set_pasid_table spt;
>> + unsigned long minsz;
>> + int ret = -EINVAL;
>> +
>> + minsz = offsetofend(struct vfio_iommu_type1_set_pasid_table, flags);
>> +
>> + if (copy_from_user(&spt, (void __user *)arg, minsz))
>> + return -EFAULT;
>> +
>> + if (spt.argsz < minsz)
>> + return -EINVAL;
>> +
>> + if (spt.flags & VFIO_PASID_TABLE_FLAG_SET &&
>> + spt.flags & VFIO_PASID_TABLE_FLAG_UNSET)
>> + return -EINVAL;
>> +
>> + if (spt.flags & VFIO_PASID_TABLE_FLAG_SET)
>> + ret = vfio_attach_pasid_table(iommu, arg + minsz);
>> + else if (spt.flags & VFIO_PASID_TABLE_FLAG_UNSET) {
>> + vfio_detach_pasid_table(iommu);
>> + ret = 0;
>> + }
>> + return ret;
>> +}
>> +
>> static int vfio_iommu_type1_dirty_pages(struct vfio_iommu *iommu,
>> unsigned long arg)
>> {
>> @@ -2867,6 +2930,8 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
>> return vfio_iommu_type1_unmap_dma(iommu, arg);
>> case VFIO_IOMMU_DIRTY_PAGES:
>> return vfio_iommu_type1_dirty_pages(iommu, arg);
>> + case VFIO_IOMMU_SET_PASID_TABLE:
>> + return vfio_iommu_type1_set_pasid_table(iommu, arg);
>> default:
>> return -ENOTTY;
>> }
>> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
>> index 2f313a238a8f..78ce3ce6c331 100644
>> --- a/include/uapi/linux/vfio.h
>> +++ b/include/uapi/linux/vfio.h
>> @@ -14,6 +14,7 @@
>>
>> #include <linux/types.h>
>> #include <linux/ioctl.h>
>> +#include <linux/iommu.h>
>>
>> #define VFIO_API_VERSION 0
>>
>> @@ -1180,6 +1181,24 @@ struct vfio_iommu_type1_dirty_bitmap_get {
>>
>> #define VFIO_IOMMU_DIRTY_PAGES _IO(VFIO_TYPE, VFIO_BASE + 17)
>>
>> +/*
>> + * VFIO_IOMMU_SET_PASID_TABLE - _IOWR(VFIO_TYPE, VFIO_BASE + 22,
>> + * struct vfio_iommu_type1_set_pasid_table)
>> + *
>> + * The SET operation passes a PASID table to the host while the
>> + * UNSET operation detaches the one currently programmed. Setting
>> + * a table while another is already programmed replaces the old table.
>> + */
>> +struct vfio_iommu_type1_set_pasid_table {
>> + __u32 argsz;
>> + __u32 flags;
>> +#define VFIO_PASID_TABLE_FLAG_SET (1 << 0)
>> +#define VFIO_PASID_TABLE_FLAG_UNSET (1 << 1)
>> + struct iommu_pasid_table_config config; /* used on SET */
>> +};
>> +
>> +#define VFIO_IOMMU_SET_PASID_TABLE _IO(VFIO_TYPE, VFIO_BASE + 22)
>> +
>> /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
>>
>> /*
>>
>
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next prev parent reply other threads:[~2021-02-22 10:53 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-16 11:00 [PATCH v11 00/13] SMMUv3 Nested Stage Setup (VFIO part) Eric Auger
2020-11-16 11:00 ` [PATCH v11 01/13] vfio: VFIO_IOMMU_SET_PASID_TABLE Eric Auger
2020-11-17 2:11 ` kernel test robot
2020-11-24 21:31 ` Alex Williamson
2021-02-02 12:34 ` Keqian Zhu
2021-02-22 10:53 ` Auger Eric [this message]
2021-02-22 12:20 ` Keqian Zhu
2021-02-22 16:12 ` Auger Eric
2020-11-16 11:00 ` [PATCH v11 02/13] vfio: VFIO_IOMMU_CACHE_INVALIDATE Eric Auger
2020-11-16 11:00 ` [PATCH v11 03/13] vfio: VFIO_IOMMU_SET_MSI_BINDING Eric Auger
2021-02-02 12:08 ` Keqian Zhu
2020-11-16 11:00 ` [PATCH v11 04/13] vfio/pci: Add VFIO_REGION_TYPE_NESTED region type Eric Auger
2020-12-17 11:49 ` Kunkun Jiang
2021-02-23 12:45 ` Shenming Lu
2021-02-23 12:57 ` Auger Eric
2020-11-16 11:00 ` [PATCH v11 05/13] vfio/pci: Register an iommu fault handler Eric Auger
2020-11-16 13:51 ` kernel test robot
2020-11-16 19:30 ` kernel test robot
2020-11-16 11:00 ` [PATCH v11 06/13] vfio/pci: Allow to mmap the fault queue Eric Auger
2020-11-16 11:00 ` [PATCH v11 07/13] vfio: Use capability chains to handle device specific irq Eric Auger
2020-11-16 11:00 ` [PATCH v11 08/13] vfio/pci: Add framework for custom interrupt indices Eric Auger
2020-11-23 12:51 ` Shameerali Kolothum Thodi
2020-11-24 8:35 ` Auger Eric
2020-11-16 11:00 ` [PATCH v11 09/13] vfio: Add new IRQ for DMA fault reporting Eric Auger
2020-11-16 11:00 ` [PATCH v11 10/13] vfio/pci: Register and allow DMA FAULT IRQ signaling Eric Auger
2020-11-16 11:00 ` [PATCH v11 11/13] vfio: Document nested stage control Eric Auger
2020-11-16 11:00 ` [PATCH v11 12/13] vfio/pci: Register a DMA fault response region Eric Auger
2021-01-08 15:19 ` Shameerali Kolothum Thodi
2021-02-18 10:36 ` Shameerali Kolothum Thodi
2021-02-18 10:48 ` Auger Eric
2020-11-16 11:00 ` [PATCH v11 13/13] vfio/pci: Inject page response upon response region fill Eric Auger
2021-03-15 18:04 ` [PATCH v11 00/13] SMMUv3 Nested Stage Setup (VFIO part) Krishna Reddy
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