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SubjectRe: [PATCH v6 09/22] vfio: VFIO_IOMMU_BIND/UNBIND_MSI
On Sun, 17 Mar 2019 18:22:19 +0100
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>
>
> ---
> 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 | 58 +++++++++++++++++++++++++++++++++
> include/uapi/linux/vfio.h | 29 +++++++++++++++++
> 2 files changed, 87 insertions(+)
>
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index 12a40b9db6aa..66513679081b 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -1710,6 +1710,25 @@ static int vfio_cache_inv_fn(struct device *dev, void *data)
> return iommu_cache_invalidate(d, dev, &ustruct->info);
> }
>
> +static int vfio_bind_msi_fn(struct device *dev, void *data)
> +{
> + struct vfio_iommu_type1_bind_msi *ustruct =
> + (struct vfio_iommu_type1_bind_msi *)data;
> + struct iommu_domain *d = iommu_get_domain_for_dev(dev);
> +
> + return iommu_bind_guest_msi(d, dev, ustruct->iova,
> + ustruct->gpa, ustruct->size);
> +}
> +
> +static int vfio_unbind_msi_fn(struct device *dev, void *data)
> +{
> + dma_addr_t *iova = (dma_addr_t *)data;
> + struct iommu_domain *d = iommu_get_domain_for_dev(dev);

Same as previous, we can encapsulate domain in our own struct to avoid
a lookup.

> +
> + iommu_unbind_guest_msi(d, dev, *iova);

Is it strange that iommu-core is exposing these interfaces at a device
level if every one of them requires us to walk all the devices? Thanks,

Alex

> + return 0;
> +}
> +
> static long vfio_iommu_type1_ioctl(void *iommu_data,
> unsigned int cmd, unsigned long arg)
> {
> @@ -1814,6 +1833,45 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
> vfio_cache_inv_fn);
> mutex_unlock(&iommu->lock);
> return ret;
> + } else if (cmd == VFIO_IOMMU_BIND_MSI) {
> + struct vfio_iommu_type1_bind_msi ustruct;
> + int ret;
> +
> + 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;
> +
> + mutex_lock(&iommu->lock);
> + ret = vfio_iommu_for_each_dev(iommu, &ustruct,
> + vfio_bind_msi_fn);
> + if (ret)
> + vfio_iommu_for_each_dev(iommu, &ustruct.iova,
> + vfio_unbind_msi_fn);
> + mutex_unlock(&iommu->lock);
> + return ret;
> + } else if (cmd == VFIO_IOMMU_UNBIND_MSI) {
> + struct vfio_iommu_type1_unbind_msi ustruct;
> + int ret;
> +
> + 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;
> +
> + mutex_lock(&iommu->lock);
> + ret = vfio_iommu_for_each_dev(iommu, &ustruct.iova,
> + vfio_unbind_msi_fn);
> + mutex_unlock(&iommu->lock);
> + return ret;
> }
>
> return -ENOTTY;
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 29f0ef2d805d..6763389b6adc 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -789,6 +789,35 @@ 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 -------- */
>
> /*

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