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Re: [PULL v3 23/32] s390x/pci: Add routine to get the vfio dma available
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PULL v3 23/32] s390x/pci: Add routine to get the vfio dma available count |
Date: |
Tue, 3 Nov 2020 06:49:13 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1 |
Hi Matthew,
On 11/1/20 10:02 PM, Alex Williamson wrote:
> From: Matthew Rosato <mjrosato@linux.ibm.com>
>
> Create new files for separating out vfio-specific work for s390
> pci. Add the first such routine, which issues VFIO_IOMMU_GET_INFO
> ioctl to collect the current dma available count.
>
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> [aw: Fix non-Linux build with CONFIG_LINUX]
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> ---
> hw/s390x/meson.build | 1 +
> hw/s390x/s390-pci-vfio.c | 54
> ++++++++++++++++++++++++++++++++++++++
> include/hw/s390x/s390-pci-vfio.h | 24 +++++++++++++++++
> 3 files changed, 79 insertions(+)
> create mode 100644 hw/s390x/s390-pci-vfio.c
> create mode 100644 include/hw/s390x/s390-pci-vfio.h
>
> diff --git a/hw/s390x/meson.build b/hw/s390x/meson.build
> index 948ceae7a7b3..f4663a835514 100644
> --- a/hw/s390x/meson.build
> +++ b/hw/s390x/meson.build
> @@ -27,6 +27,7 @@ s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
> ))
> s390x_ss.add(when: 'CONFIG_S390_CCW_VIRTIO', if_true:
> files('s390-virtio-ccw.c'))
> s390x_ss.add(when: 'CONFIG_TERMINAL3270', if_true: files('3270-ccw.c'))
> +s390x_ss.add(when: 'CONFIG_LINUX', if_true: files('s390-pci-vfio.c'))
>
> virtio_ss = ss.source_set()
> virtio_ss.add(files('virtio-ccw.c'))
> diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
> new file mode 100644
> index 000000000000..cb3f4d98adf8
> --- /dev/null
> +++ b/hw/s390x/s390-pci-vfio.c
> @@ -0,0 +1,54 @@
> +/*
> + * s390 vfio-pci interfaces
> + *
> + * Copyright 2020 IBM Corp.
> + * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or (at
> + * your option) any later version. See the COPYING file in the top-level
> + * directory.
> + */
> +
> +#include <sys/ioctl.h>
> +
> +#include "qemu/osdep.h"
> +#include "hw/s390x/s390-pci-vfio.h"
> +#include "hw/vfio/vfio-common.h"
> +
> +/*
> + * Get the current DMA available count from vfio. Returns true if vfio is
> + * limiting DMA requests, false otherwise. The current available count read
> + * from vfio is returned in avail.
> + */
> +bool s390_pci_update_dma_avail(int fd, unsigned int *avail)
> +{
> + g_autofree struct vfio_iommu_type1_info *info;
> + uint32_t argsz;
> +
> + assert(avail);
> +
> + argsz = sizeof(struct vfio_iommu_type1_info);
> + info = g_malloc0(argsz);
> +
> + /*
> + * If the specified argsz is not large enough to contain all capabilities
> + * it will be updated upon return from the ioctl. Retry until we have
> + * a big enough buffer to hold the entire capability chain.
> + */
> +retry:
> + info->argsz = argsz;
> +
> + if (ioctl(fd, VFIO_IOMMU_GET_INFO, info)) {
> + return false;
> + }
> +
> + if (info->argsz > argsz) {
> + argsz = info->argsz;
> + info = g_realloc(info, argsz);
> + goto retry;
> + }
> +
> + /* If the capability exists, update with the current value */
> + return vfio_get_info_dma_avail(info, avail);
> +}
--without-default-devices configuration is broken, bisected
to this commit:
hw/s390x/s390-pci-vfio.c:52: undefined reference to
`vfio_get_info_dma_avail'
Can you have a look please?
Thanks.
- [PULL v3 14/32] vfio: Dirty page tracking when vIOMMU is enabled, (continued)
- [PULL v3 14/32] vfio: Dirty page tracking when vIOMMU is enabled, Alex Williamson, 2020/11/01
- [PULL v3 15/32] vfio: Add ioctl to get dirty pages bitmap during dma unmap, Alex Williamson, 2020/11/01
- [PULL v3 16/32] vfio: Make vfio-pci device migration capable, Alex Williamson, 2020/11/01
- [PULL v3 17/32] qapi: Add VFIO devices migration stats in Migration stats, Alex Williamson, 2020/11/01
- [PULL v3 18/32] update-linux-headers: Add vfio_zdev.h, Alex Williamson, 2020/11/01
- [PULL v3 19/32] linux-headers: update against 5.10-rc1, Alex Williamson, 2020/11/01
- [PULL v3 20/32] s390x/pci: Move header files to include/hw/s390x, Alex Williamson, 2020/11/01
- [PULL v3 21/32] vfio: Create shared routine for scanning info capabilities, Alex Williamson, 2020/11/01
- [PULL v3 22/32] vfio: Find DMA available capability, Alex Williamson, 2020/11/01
- [PULL v3 23/32] s390x/pci: Add routine to get the vfio dma available count, Alex Williamson, 2020/11/01
- Re: [PULL v3 23/32] s390x/pci: Add routine to get the vfio dma available count,
Philippe Mathieu-Daudé <=
[PULL v3 24/32] s390x/pci: Honor DMA limits set by vfio, Alex Williamson, 2020/11/01
[PULL v3 26/32] s390x/pci: use a PCI Group structure, Alex Williamson, 2020/11/01