From: Auger Eric <eric.auger@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: eric.auger.pro@gmail.com, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, joro@8bytes.org,
jacob.jun.pan@linux.intel.com, yi.l.liu@intel.com,
jean-philippe.brucker@arm.com, will.deacon@arm.com,
robin.murphy@arm.com, kevin.tian@intel.com, ashok.raj@intel.com,
marc.zyngier@arm.com, peter.maydell@linaro.org,
vincent.stehle@arm.com
Subject: Re: [PATCH v8 24/29] vfio: VFIO_IOMMU_BIND/UNBIND_MSI
Date: Fri, 7 Jun 2019 10:30:00 +0200 [thread overview]
Message-ID: <0859eb67-4f77-1adb-7b34-2969060211c5@redhat.com> (raw)
In-Reply-To: <20190603163227.4d00476a@x1.home>
Hi Alex,
On 6/4/19 12:32 AM, Alex Williamson wrote:
> On Sun, 26 May 2019 18:09:59 +0200
> Eric Auger <eric.auger@redhat.com> wrote:
>
>> This patch adds the VFIO_IOMMU_BIND/UNBIND_MSI ioctl which aim
>> to pass/withdraw the guest MSI binding to/from the host.
>>
>> Signed-off-by: Eric Auger <eric.auger@redhat.com>
>>
>> ---
>> v6 -> v7:
>> - removed the dev arg
>>
>> v3 -> v4:
>> - add UNBIND
>> - unwind on BIND error
>>
>> v2 -> v3:
>> - adapt to new proto of bind_guest_msi
>> - directly use vfio_iommu_for_each_dev
>>
>> v1 -> v2:
>> - s/vfio_iommu_type1_guest_msi_binding/vfio_iommu_type1_bind_guest_msi
>> ---
>> drivers/vfio/vfio_iommu_type1.c | 64 +++++++++++++++++++++++++++++++++
>> include/uapi/linux/vfio.h | 29 +++++++++++++++
>> 2 files changed, 93 insertions(+)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index 6fda4fbc9bfa..18142cb078a3 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -1832,6 +1832,42 @@ static int vfio_cache_inv_fn(struct device *dev, void *data)
>> return iommu_cache_invalidate(dc->domain, dev, &ustruct->info);
>> }
>>
>> +static int
>> +vfio_bind_msi(struct vfio_iommu *iommu,
>> + dma_addr_t giova, phys_addr_t gpa, size_t size)
>> +{
>> + struct vfio_domain *d;
>> + int ret = 0;
>> +
>> + mutex_lock(&iommu->lock);
>> +
>> + list_for_each_entry(d, &iommu->domain_list, next) {
>> + ret = iommu_bind_guest_msi(d->domain, giova, gpa, size);
>> + if (ret)
>> + goto unwind;
>> + }
>> + goto unlock;
>> +unwind:
>> + list_for_each_entry_continue_reverse(d, &iommu->domain_list, next) {
>> + iommu_unbind_guest_msi(d->domain, giova);
>> + }
>> +unlock:
>> + mutex_unlock(&iommu->lock);
>> + return ret;
>> +}
>> +
>> +static void
>> +vfio_unbind_msi(struct vfio_iommu *iommu, dma_addr_t giova)
>> +{
>> + struct vfio_domain *d;
>> +
>> + mutex_lock(&iommu->lock);
>> + list_for_each_entry(d, &iommu->domain_list, next) {
>> + iommu_unbind_guest_msi(d->domain, giova);
>> + }
>> + mutex_unlock(&iommu->lock);
>> +}
>> +
>> static long vfio_iommu_type1_ioctl(void *iommu_data,
>> unsigned int cmd, unsigned long arg)
>> {
>> @@ -1936,6 +1972,34 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
>> &ustruct);
>> mutex_unlock(&iommu->lock);
>> return ret;
>> + } else if (cmd == VFIO_IOMMU_BIND_MSI) {
>> + struct vfio_iommu_type1_bind_msi ustruct;
>> +
>> + minsz = offsetofend(struct vfio_iommu_type1_bind_msi,
>> + size);
>> +
>> + if (copy_from_user(&ustruct, (void __user *)arg, minsz))
>> + return -EFAULT;
>> +
>> + if (ustruct.argsz < minsz || ustruct.flags)
>> + return -EINVAL;
>> +
>> + return vfio_bind_msi(iommu, ustruct.iova, ustruct.gpa,
>> + ustruct.size);
>> + } else if (cmd == VFIO_IOMMU_UNBIND_MSI) {
>> + struct vfio_iommu_type1_unbind_msi ustruct;
>> +
>> + minsz = offsetofend(struct vfio_iommu_type1_unbind_msi,
>> + iova);
>> +
>> + if (copy_from_user(&ustruct, (void __user *)arg, minsz))
>> + return -EFAULT;
>> +
>> + if (ustruct.argsz < minsz || ustruct.flags)
>> + return -EINVAL;
>> +
>> + vfio_unbind_msi(iommu, ustruct.iova);
>> + return 0;
>> }
>>
>> return -ENOTTY;
>> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
>> index 055aa9b9745a..2774a1ab37ae 100644
>> --- a/include/uapi/linux/vfio.h
>> +++ b/include/uapi/linux/vfio.h
>> @@ -798,6 +798,35 @@ struct vfio_iommu_type1_cache_invalidate {
>> };
>> #define VFIO_IOMMU_CACHE_INVALIDATE _IO(VFIO_TYPE, VFIO_BASE + 24)
>>
>> +/**
>> + * VFIO_IOMMU_BIND_MSI - _IOWR(VFIO_TYPE, VFIO_BASE + 25,
>> + * struct vfio_iommu_type1_bind_msi)
>> + *
>> + * Pass a stage 1 MSI doorbell mapping to the host so that this
>> + * latter can build a nested stage2 mapping
>> + */
>> +struct vfio_iommu_type1_bind_msi {
>> + __u32 argsz;
>> + __u32 flags;
>> + __u64 iova;
>> + __u64 gpa;
>> + __u64 size;
>> +};
>> +#define VFIO_IOMMU_BIND_MSI _IO(VFIO_TYPE, VFIO_BASE + 25)
>> +
>> +/**
>> + * VFIO_IOMMU_UNBIND_MSI - _IOWR(VFIO_TYPE, VFIO_BASE + 26,
>> + * struct vfio_iommu_type1_unbind_msi)
>> + *
>> + * Unregister an MSI mapping
>> + */
>> +struct vfio_iommu_type1_unbind_msi {
>> + __u32 argsz;
>> + __u32 flags;
>> + __u64 iova;
>> +};
>> +#define VFIO_IOMMU_UNBIND_MSI _IO(VFIO_TYPE, VFIO_BASE + 26)
>> +
>> /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
>>
>> /*
>
> And another pair of ioctls. Maybe think about how we can reduce the
> ioctl bloat of this series. I don't want to impose an awkward
> interface for the sake of fewer ioctls, but I also don't want us
> casually burning through ioctls.
OK, understood.
Thanks
Eric
>
next prev parent reply other threads:[~2019-06-07 8:30 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-26 16:09 [PATCH v8 00/29] SMMUv3 Nested Stage Setup Eric Auger
2019-05-26 16:09 ` [PATCH v8 01/29] driver core: Add per device iommu param Eric Auger
2019-05-26 16:09 ` [PATCH v8 02/29] iommu: Introduce device fault data Eric Auger
2019-05-26 16:09 ` [PATCH v8 03/29] iommu: Introduce device fault report API Eric Auger
2019-05-26 16:09 ` [PATCH v8 04/29] iommu: Add recoverable fault reporting Eric Auger
2019-06-03 22:31 ` Alex Williamson
2019-06-04 15:48 ` Jacob Pan
2019-05-26 16:09 ` [PATCH v8 05/29] iommu: Add a timeout parameter for PRQ response Eric Auger
2019-06-03 22:32 ` Alex Williamson
2019-06-04 10:52 ` Jean-Philippe Brucker
2019-06-04 15:50 ` Jacob Pan
2019-05-26 16:09 ` [PATCH v8 06/29] trace/iommu: Add sva trace events Eric Auger
2019-05-26 16:09 ` [PATCH v8 07/29] iommu: Use device fault trace event Eric Auger
2019-05-26 16:09 ` [PATCH v8 08/29] iommu: Introduce attach/detach_pasid_table API Eric Auger
2019-05-26 16:09 ` [PATCH v8 09/29] iommu: Introduce cache_invalidate API Eric Auger
2019-05-26 16:09 ` [PATCH v8 10/29] iommu: Introduce bind/unbind_guest_msi Eric Auger
2019-05-26 16:09 ` [PATCH v8 11/29] iommu/arm-smmu-v3: Maintain a SID->device structure Eric Auger
2019-05-26 16:09 ` [PATCH v8 12/29] iommu/smmuv3: Dynamically allocate s1_cfg and s2_cfg Eric Auger
2019-05-26 16:09 ` [PATCH v8 13/29] iommu/smmuv3: Get prepared for nested stage support Eric Auger
2019-05-26 16:09 ` [PATCH v8 14/29] iommu/smmuv3: Implement attach/detach_pasid_table Eric Auger
2019-05-26 16:09 ` [PATCH v8 15/29] iommu/smmuv3: Introduce __arm_smmu_tlb_inv_asid/s1_range_nosync Eric Auger
2019-05-26 16:09 ` [PATCH v8 16/29] iommu/smmuv3: Implement cache_invalidate Eric Auger
2019-05-26 16:09 ` [PATCH v8 17/29] dma-iommu: Implement NESTED_MSI cookie Eric Auger
2019-05-26 16:09 ` [PATCH v8 18/29] iommu/smmuv3: Nested mode single MSI doorbell per domain enforcement Eric Auger
2019-05-26 16:09 ` [PATCH v8 19/29] iommu/smmuv3: Enforce incompatibility between nested mode and HW MSI regions Eric Auger
2019-05-26 16:09 ` [PATCH v8 20/29] iommu/smmuv3: Implement bind/unbind_guest_msi Eric Auger
2019-05-26 16:09 ` [PATCH v8 21/29] iommu/smmuv3: Report non recoverable faults Eric Auger
2019-05-26 16:09 ` [PATCH v8 22/29] vfio: VFIO_IOMMU_ATTACH/DETACH_PASID_TABLE Eric Auger
2019-06-03 22:32 ` Alex Williamson
2019-05-26 16:09 ` [PATCH v8 23/29] vfio: VFIO_IOMMU_CACHE_INVALIDATE Eric Auger
2019-06-14 12:38 ` Liu, Yi L
2019-06-14 13:17 ` Auger Eric
2019-05-26 16:09 ` [PATCH v8 24/29] vfio: VFIO_IOMMU_BIND/UNBIND_MSI Eric Auger
2019-06-03 22:32 ` Alex Williamson
2019-06-07 8:30 ` Auger Eric [this message]
2019-05-26 16:10 ` [PATCH v8 25/29] vfio-pci: Add a new VFIO_REGION_TYPE_NESTED region type Eric Auger
2019-06-03 22:31 ` Alex Williamson
2019-06-07 8:28 ` Auger Eric
2019-06-07 12:47 ` Jean-Philippe Brucker
2019-06-07 16:29 ` Alex Williamson
2019-05-26 16:10 ` [PATCH v8 26/29] vfio-pci: Register an iommu fault handler Eric Auger
2019-06-03 22:31 ` Alex Williamson
2019-06-04 16:11 ` Auger Eric
2019-06-05 22:45 ` Jacob Pan
2019-06-06 18:54 ` Jean-Philippe Brucker
2019-06-06 20:29 ` Jacob Pan
2019-06-07 7:02 ` Auger Eric
2019-06-07 10:28 ` Jean-Philippe Brucker
2019-06-07 17:43 ` Jacob Pan
2019-06-10 12:45 ` Jean-Philippe Brucker
2019-06-10 21:31 ` Jacob Pan
2019-06-11 13:14 ` Jean-Philippe Brucker
2019-06-12 18:53 ` Jacob Pan
2019-06-18 14:04 ` Jean-Philippe Brucker
2019-06-19 0:19 ` Jacob Pan
2019-06-19 11:44 ` Jean-Philippe Brucker
2019-07-11 13:07 ` Auger Eric
2019-06-07 12:48 ` Jean-Philippe Brucker
2019-06-07 14:18 ` Auger Eric
2019-05-26 16:10 ` [PATCH v8 27/29] vfio_pci: Allow to mmap the fault queue Eric Auger
2019-05-26 16:10 ` [PATCH v8 28/29] vfio-pci: Add VFIO_PCI_DMA_FAULT_IRQ_INDEX Eric Auger
2019-06-03 22:31 ` Alex Williamson
2019-06-04 16:11 ` Auger Eric
2019-05-26 16:10 ` [PATCH v8 29/29] vfio: Document nested stage control Eric Auger
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