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Message-ID: <77c0e8bf-1a61-c009-ab18-a62d9fe2f8a0@nvidia.com>
Date: Tue, 25 Oct 2016 02:52:39 +0530
From: Kirti Wankhede <kwankhede@...dia.com>
To: Alex Williamson <alex.williamson@...hat.com>
CC: <pbonzini@...hat.com>, <kraxel@...hat.com>, <cjia@...dia.com>,
<qemu-devel@...gnu.org>, <kvm@...r.kernel.org>,
<kevin.tian@...el.com>, <jike.song@...el.com>,
<bjsdjshi@...ux.vnet.ibm.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 06/12] vfio_pci: Update vfio_pci to use
vfio_info_add_capability()
On 10/21/2016 12:54 AM, Alex Williamson wrote:
> On Tue, 18 Oct 2016 02:52:06 +0530
> Kirti Wankhede <kwankhede@...dia.com> wrote:
>
>> Update msix_sparse_mmap_cap() to use vfio_info_add_capability()
>> Update region type capability to use vfio_info_add_capability()
>> Can't split this commit for MSIx and region_type cap since there is a
>> common code which need to be updated for both the cases.
>>
>> Signed-off-by: Kirti Wankhede <kwankhede@...dia.com>
>> Signed-off-by: Neo Jia <cjia@...dia.com>
>> Change-Id: I52bb28c7875a6da5a79ddad1843e6088aff58a45
>> ---
>> drivers/vfio/pci/vfio_pci.c | 72 +++++++++++++++++----------------------------
>> 1 file changed, 27 insertions(+), 45 deletions(-)
>>
>> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
>> index d624a527777f..1ec0565b48ea 100644
>> --- a/drivers/vfio/pci/vfio_pci.c
>> +++ b/drivers/vfio/pci/vfio_pci.c
>> @@ -556,12 +556,12 @@ static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
>> }
>>
>> static int msix_sparse_mmap_cap(struct vfio_pci_device *vdev,
>> + struct vfio_region_info *info,
>> struct vfio_info_cap *caps)
>> {
>> - struct vfio_info_cap_header *header;
>> struct vfio_region_info_cap_sparse_mmap *sparse;
>> size_t end, size;
>> - int nr_areas = 2, i = 0;
>> + int nr_areas = 2, i = 0, ret;
>>
>> end = pci_resource_len(vdev->pdev, vdev->msix_bar);
>>
>> @@ -572,13 +572,10 @@ static int msix_sparse_mmap_cap(struct vfio_pci_device *vdev,
>>
>> size = sizeof(*sparse) + (nr_areas * sizeof(*sparse->areas));
>>
>> - header = vfio_info_cap_add(caps, size,
>> - VFIO_REGION_INFO_CAP_SPARSE_MMAP, 1);
>> - if (IS_ERR(header))
>> - return PTR_ERR(header);
>> + sparse = kzalloc(size, GFP_KERNEL);
>> + if (!sparse)
>> + return -ENOMEM;
>>
>> - sparse = container_of(header,
>> - struct vfio_region_info_cap_sparse_mmap, header);
>> sparse->nr_areas = nr_areas;
>>
>> if (vdev->msix_offset & PAGE_MASK) {
>> @@ -594,26 +591,11 @@ static int msix_sparse_mmap_cap(struct vfio_pci_device *vdev,
>> i++;
>> }
>>
>> - return 0;
>> -}
>> -
>> -static int region_type_cap(struct vfio_pci_device *vdev,
>> - struct vfio_info_cap *caps,
>> - unsigned int type, unsigned int subtype)
>> -{
>> - struct vfio_info_cap_header *header;
>> - struct vfio_region_info_cap_type *cap;
>> -
>> - header = vfio_info_cap_add(caps, sizeof(*cap),
>> - VFIO_REGION_INFO_CAP_TYPE, 1);
>> - if (IS_ERR(header))
>> - return PTR_ERR(header);
>> + ret = vfio_info_add_capability(info, caps,
>> + VFIO_REGION_INFO_CAP_SPARSE_MMAP, sparse);
>> + kfree(sparse);
>>
>> - cap = container_of(header, struct vfio_region_info_cap_type, header);
>> - cap->type = type;
>> - cap->subtype = subtype;
>> -
>> - return 0;
>> + return ret;
>> }
>>
>> int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
>> @@ -704,7 +686,8 @@ static long vfio_pci_ioctl(void *device_data,
>> if (vdev->bar_mmap_supported[info.index]) {
>> info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
>> if (info.index == vdev->msix_bar) {
>> - ret = msix_sparse_mmap_cap(vdev, &caps);
>> + ret = msix_sparse_mmap_cap(vdev, &info,
>> + &caps);
>> if (ret)
>> return ret;
>> }
>> @@ -752,6 +735,9 @@ static long vfio_pci_ioctl(void *device_data,
>>
>> break;
>> default:
>> + {
>> + struct vfio_region_info_cap_type cap_type;
>> +
>> if (info.index >=
>> VFIO_PCI_NUM_REGIONS + vdev->num_regions)
>> return -EINVAL;
>> @@ -762,27 +748,23 @@ static long vfio_pci_ioctl(void *device_data,
>> info.size = vdev->region[i].size;
>> info.flags = vdev->region[i].flags;
>>
>> - ret = region_type_cap(vdev, &caps,
>> - vdev->region[i].type,
>> - vdev->region[i].subtype);
>> + cap_type.type = vdev->region[i].type;
>> + cap_type.subtype = vdev->region[i].subtype;
>> +
>> + ret = vfio_info_add_capability(&info, &caps,
>> + VFIO_REGION_INFO_CAP_TYPE,
>> + &cap_type);
>> if (ret)
>> return ret;
>> +
>> + }
>> }
>>
>> - if (caps.size) {
>> - info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
>> - 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);
>
> I prefer the case above, I'm fine with breaking out helpers to build a
> buffer containing the capability chain, but I would rather have the
> caller manage placing that back into the return structure. That also
> allows the helper to be independent of the structure we're operating
> on, it could be a region_info, irq_info, device_info, etc. It only
> needs to know the layout of the capability type we're trying to add,
> not the info structure itself. Thanks,
>
The capability feature is for region_info (VFIO_REGION_INFO_FLAG_CAPS),
then structure we are operating couldn't be irq_info or device_info, right?
Kirti.
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