On Sun, 26 May 2019 18:09:59 +0200 Eric Auger <[email protected]> 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 <[email protected]> > > --- > 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. _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
