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[PULL 09/15] vfio: Query and store the maximum number of possible DMA ma
From: |
Eduardo Habkost |
Subject: |
[PULL 09/15] vfio: Query and store the maximum number of possible DMA mappings |
Date: |
Wed, 7 Jul 2021 15:32:35 -0400 |
From: David Hildenbrand <david@redhat.com>
Let's query the maximum number of possible DMA mappings by querying the
available mappings when creating the container (before any mappings are
created). We'll use this informaton soon to perform some sanity checks
and warn the user.
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Auger Eric <eric.auger@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: teawater <teawaterz@linux.alibaba.com>
Cc: Marek Kedzierski <mkedzier@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210413095531.25603-8-david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
include/hw/vfio/vfio-common.h | 1 +
hw/vfio/common.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 681432213d1..8af11b0a769 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -88,6 +88,7 @@ typedef struct VFIOContainer {
uint64_t dirty_pgsizes;
uint64_t max_dirty_bitmap_size;
unsigned long pgsizes;
+ unsigned int dma_max_mappings;
QLIST_HEAD(, VFIOGuestIOMMU) giommu_list;
QLIST_HEAD(, VFIOHostDMAWindow) hostwin_list;
QLIST_HEAD(, VFIOGroup) group_list;
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 5af77552279..79628d60aed 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1931,6 +1931,7 @@ static int vfio_connect_container(VFIOGroup *group,
AddressSpace *as,
container->fd = fd;
container->error = NULL;
container->dirty_pages_supported = false;
+ container->dma_max_mappings = 0;
QLIST_INIT(&container->giommu_list);
QLIST_INIT(&container->hostwin_list);
QLIST_INIT(&container->vrdl_list);
@@ -1962,7 +1963,10 @@ static int vfio_connect_container(VFIOGroup *group,
AddressSpace *as,
vfio_host_win_add(container, 0, (hwaddr)-1, info->iova_pgsizes);
container->pgsizes = info->iova_pgsizes;
+ /* The default in the kernel ("dma_entry_limit") is 65535. */
+ container->dma_max_mappings = 65535;
if (!ret) {
+ vfio_get_info_dma_avail(info, &container->dma_max_mappings);
vfio_get_iommu_info_migration(container, info);
}
g_free(info);
--
2.31.1
- [PULL 00/15] Machine queue, 2021-07-07, Eduardo Habkost, 2021/07/07
- [PULL 02/15] Deprecate pmem=on with non-DAX capable backend file, Eduardo Habkost, 2021/07/07
- [PULL 04/15] memory: Helpers to copy/free a MemoryRegionSection, Eduardo Habkost, 2021/07/07
- [PULL 03/15] memory: Introduce RamDiscardManager for RAM memory regions, Eduardo Habkost, 2021/07/07
- [PULL 01/15] vmbus: Don't make QOM property registration conditional, Eduardo Habkost, 2021/07/07
- [PULL 05/15] virtio-mem: Factor out traversing unplugged ranges, Eduardo Habkost, 2021/07/07
- [PULL 06/15] virtio-mem: Don't report errors when ram_block_discard_range() fails, Eduardo Habkost, 2021/07/07
- [PULL 07/15] virtio-mem: Implement RamDiscardManager interface, Eduardo Habkost, 2021/07/07
- [PULL 09/15] vfio: Query and store the maximum number of possible DMA mappings,
Eduardo Habkost <=
- [PULL 10/15] vfio: Sanity check maximum number of DMA mappings with RamDiscardManager, Eduardo Habkost, 2021/07/07
- [PULL 08/15] vfio: Support for RamDiscardManager in the !vIOMMU case, Eduardo Habkost, 2021/07/07
- [PULL 11/15] vfio: Support for RamDiscardManager in the vIOMMU case, Eduardo Habkost, 2021/07/07
- [PULL 12/15] softmmu/physmem: Don't use atomic operations in ram_block_discard_(disable|require), Eduardo Habkost, 2021/07/07
- [PULL 13/15] softmmu/physmem: Extend ram_block_discard_(require|disable) by two discard types, Eduardo Habkost, 2021/07/07
- [PULL 15/15] vfio: Disable only uncoordinated discards for VFIO_TYPE1 iommus, Eduardo Habkost, 2021/07/07
- [PULL 14/15] virtio-mem: Require only coordinated discards, Eduardo Habkost, 2021/07/07
- Re: [PULL 00/15] Machine queue, 2021-07-07, Peter Maydell, 2021/07/08