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From e6147c5a23a75361b1374bfb4b96403d243b5c38 Mon Sep 17 00:00:00 2001
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From: Cornelia Huck <cohuck@redhat.com>
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Date: Tue, 19 Jan 2021 12:50:43 -0500
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Subject: [PATCH 4/7] vfio: Find DMA available capability
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RH-Author: Cornelia Huck <cohuck@redhat.com>
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Message-id: <20210119125046.472811-5-cohuck@redhat.com>
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Patchwork-id: 100677
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 4/7] vfio: Find DMA available capability
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Bugzilla: 1905391
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Auger Eric <eric.auger@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Matthew Rosato <mjrosato@linux.ibm.com>
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The underlying host may be limiting the number of outstanding DMA
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requests for type 1 IOMMU. Add helper functions to check for the
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DMA available capability and retrieve the current number of DMA
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mappings allowed.
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Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
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Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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[aw: vfio_get_info_dma_avail moved inside CONFIG_LINUX]
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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(cherry picked from commit 7486a62845b1e12011dd99973e4739f69d57cd38)
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/vfio/common.c | 31 +++++++++++++++++++++++++++++++
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include/hw/vfio/vfio-common.h | 2 ++
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2 files changed, 33 insertions(+)
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diff --git a/hw/vfio/common.c b/hw/vfio/common.c
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index 77d62d2dcdf..23efdfadebd 100644
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--- a/hw/vfio/common.c
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+++ b/hw/vfio/common.c
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@@ -850,6 +850,37 @@ vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
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return vfio_get_cap((void *)info, info->cap_offset, id);
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}
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+static struct vfio_info_cap_header *
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+vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
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+{
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+ if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
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+ return NULL;
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+ }
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+
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+ return vfio_get_cap((void *)info, info->cap_offset, id);
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+}
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+
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+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
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+ unsigned int *avail)
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+{
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+ struct vfio_info_cap_header *hdr;
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+ struct vfio_iommu_type1_info_dma_avail *cap;
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+
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+ /* If the capability cannot be found, assume no DMA limiting */
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+ hdr = vfio_get_iommu_type1_info_cap(info,
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+ VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
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+ if (hdr == NULL) {
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+ return false;
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+ }
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+
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+ if (avail != NULL) {
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+ cap = (void *) hdr;
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+ *avail = cap->avail;
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+ }
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+
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+ return true;
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+}
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+
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static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
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struct vfio_region_info *info)
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{
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diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
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index fd564209ac7..aa6cbe4a998 100644
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--- a/include/hw/vfio/vfio-common.h
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+++ b/include/hw/vfio/vfio-common.h
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@@ -191,6 +191,8 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
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bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type);
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struct vfio_info_cap_header *
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vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id);
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+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
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+ unsigned int *avail);
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#endif
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extern const MemoryListener vfio_prereg_listener;
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--
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2.27.0
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