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Message-ID: <bbef66d2-badc-f992-32a8-1bd61e6662e0@redhat.com>
Date: Tue, 23 Jan 2018 12:16:50 +0100
From: Auger Eric <eric.auger@...hat.com>
To: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
linuxarm@...wei.com, john.garry@...wei.com, xuwei5@...ilicon.com
Subject: Re: [RFC v2 4/5] vfio/type1: Add IOVA range capability support
Hi Shameer,
On 12/01/18 17:45, Shameer Kolothum wrote:
> This allows the user-space to retrieve the supported IOVA
> range(s), excluding any reserved regions. The implementation
> is based on capability chains, added to VFIO_IOMMU_GET_INFO ioctl.
>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
> ---
> drivers/vfio/vfio_iommu_type1.c | 91 +++++++++++++++++++++++++++++++++++++++++
> include/uapi/linux/vfio.h | 23 +++++++++++
> 2 files changed, 114 insertions(+)
>
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index 47ea490..dc6ed85 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -1893,6 +1893,67 @@ static int vfio_domains_have_iommu_cache(struct vfio_iommu *iommu)
> return ret;
> }
>
> +static int vfio_add_iova_cap(struct vfio_info_cap *caps, void *cap_type,
can't you pass cap_type directly as a struct vfio_iommu_type1_info_cap_iova?
Also maybe using more explicit name for cap_type such as cap_iova_ranges?
> + size_t size)
> +{
> + struct vfio_info_cap_header *header;
> + struct vfio_iommu_type1_info_cap_iova *iova_cap, *iova = cap_type;
> +
> + header = vfio_info_cap_add(caps, size,
> + VFIO_IOMMU_TYPE1_INFO_CAP_IOVA, 1);
> + if (IS_ERR(header))
> + return PTR_ERR(header);
> +
> + iova_cap = container_of(header,
> + struct vfio_iommu_type1_info_cap_iova, header);
> + iova_cap->nr_iovas = iova->nr_iovas;
> + memcpy(iova_cap->iova_ranges, iova->iova_ranges,
> + iova->nr_iovas * sizeof(*iova->iova_ranges));
> + return 0;
> +}
> +
> +static int vfio_build_iommu_iova_caps(struct vfio_iommu *iommu,
> + struct vfio_info_cap *caps)
> +{
> + struct vfio_iommu_type1_info_cap_iova *iova_cap;
> + struct vfio_iova *iova;
> + size_t size;
> + int iovas = 0, i = 0, ret;
> +
> + mutex_lock(&iommu->lock);
> +
> + list_for_each_entry(iova, &iommu->iova_list, list)
> + iovas++;
> +
> + if (!iovas) {
> + ret = EINVAL;
> + goto out_unlock;
> + }
> +
> + size = sizeof(*iova_cap) + (iovas * sizeof(*iova_cap->iova_ranges));
> +
> + iova_cap = kzalloc(size, GFP_KERNEL);
> + if (!iova_cap) {
> + ret = -ENOMEM;
> + goto out_unlock;
> + }
> +
> + iova_cap->nr_iovas = iovas;
> +
> + list_for_each_entry(iova, &iommu->iova_list, list) {
> + iova_cap->iova_ranges[i].start = iova->start;
> + iova_cap->iova_ranges[i].end = iova->end;
> + i++;
> + }
> +
> + ret = vfio_add_iova_cap(caps, iova_cap, size);
> +
> + kfree(iova_cap);
> +out_unlock:
> + mutex_unlock(&iommu->lock);
> + return ret;
> +}
> +
> static long vfio_iommu_type1_ioctl(void *iommu_data,
> unsigned int cmd, unsigned long arg)
> {
> @@ -1914,6 +1975,8 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
> }
> } else if (cmd == VFIO_IOMMU_GET_INFO) {
> struct vfio_iommu_type1_info info;
> + struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
> + int ret;
>
> minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
>
> @@ -1927,6 +1990,34 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
>
> info.iova_pgsizes = vfio_pgsize_bitmap(iommu);
>
> + if (info.argsz == minsz)
> + goto done;
> +
> + ret = vfio_build_iommu_iova_caps(iommu, &caps);
> + if (ret)
> + return ret;
> +
> + if (caps.size) {
> + info.flags |= VFIO_IOMMU_INFO_CAPS;
> + minsz = offsetofend(struct vfio_iommu_type1_info,
> + cap_offset);
> + if (info.argsz < sizeof(info) + caps.size) {
> + info.argsz = sizeof(info) + caps.size;
> + info.cap_offset = 0;
> + } else {
> + vfio_info_cap_shift(&caps, sizeof(info));
> + if (copy_to_user((void __user *)arg +
> + sizeof(info), caps.buf,
> + caps.size)) {
> + kfree(caps.buf);
> + return -EFAULT;
> + }
> + info.cap_offset = sizeof(info);
> + }
> +
> + kfree(caps.buf);
> + }
> +done:
> return copy_to_user((void __user *)arg, &info, minsz) ?
> -EFAULT : 0;
>
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index e3301db..8671448 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -517,7 +517,30 @@ struct vfio_iommu_type1_info {
> __u32 argsz;
> __u32 flags;
> #define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info */
> +#define VFIO_IOMMU_INFO_CAPS (1 << 1) /* Info supports caps */
> __u64 iova_pgsizes; /* Bitmap of supported page sizes */
> + __u32 cap_offset; /* Offset within info struct of first cap */
> +};
> +
> +/*
> + * The IOVA capability allows to report the valid IOVA range(s)
> + * excluding any reserved regions associated with dev group. Any dma
> + * map attempt outside the valid iova range will return error.
> + *
> + * The structures below define version 1 of this capability.
> + */
> +#define VFIO_IOMMU_TYPE1_INFO_CAP_IOVA 1
VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE ?
> +
> +struct vfio_iova_range {
> + __u64 start;
> + __u64 end;
> +};
> +
> +struct vfio_iommu_type1_info_cap_iova {
cap_iova_ranges?
> + struct vfio_info_cap_header header;
> + __u32 nr_iovas;
> + __u32 reserved;
> + struct vfio_iova_range iova_ranges[];
> };
>
> #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
>
Otherwise looks good to me.
Thanks
Eric
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