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[PATCH v5 05/11] vfio: Query and store the maximum number of possible DM
From: |
David Hildenbrand |
Subject: |
[PATCH v5 05/11] vfio: Query and store the maximum number of possible DMA mappings |
Date: |
Thu, 21 Jan 2021 12:05:34 +0100 |
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>
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>
---
hw/vfio/common.c | 4 ++++
include/hw/vfio/vfio-common.h | 1 +
2 files changed, 5 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index f68370de6c..78be813a53 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1937,6 +1937,7 @@ 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);
@@ -1968,7 +1969,10 @@ 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);
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index af6f8d1b22..4b28c6e8ac 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;
--
2.29.2
- [PATCH v5 00/11] virtio-mem: vfio support, David Hildenbrand, 2021/01/21
- [PATCH v5 01/11] memory: Introduce RamDiscardMgr for RAM memory regions, David Hildenbrand, 2021/01/21
- [PATCH v5 02/11] virtio-mem: Factor out traversing unplugged ranges, David Hildenbrand, 2021/01/21
- [PATCH v5 03/11] virtio-mem: Implement RamDiscardMgr interface, David Hildenbrand, 2021/01/21
- [PATCH v5 04/11] vfio: Support for RamDiscardMgr in the !vIOMMU case, David Hildenbrand, 2021/01/21
- [PATCH v5 05/11] vfio: Query and store the maximum number of possible DMA mappings,
David Hildenbrand <=
- [PATCH v5 06/11] vfio: Sanity check maximum number of DMA mappings with RamDiscardMgr, David Hildenbrand, 2021/01/21
- [PATCH v5 07/11] vfio: Support for RamDiscardMgr in the vIOMMU case, David Hildenbrand, 2021/01/21
- [PATCH v5 08/11] softmmu/physmem: Don't use atomic operations in ram_block_discard_(disable|require), David Hildenbrand, 2021/01/21
- [PATCH v5 09/11] softmmu/physmem: Extend ram_block_discard_(require|disable) by two discard types, David Hildenbrand, 2021/01/21
- [PATCH v5 11/11] vfio: Disable only uncoordinated discards for VFIO_TYPE1 iommus, David Hildenbrand, 2021/01/21
- [PATCH v5 10/11] virtio-mem: Require only coordinated discards, David Hildenbrand, 2021/01/21
- Re: [PATCH v5 00/11] virtio-mem: vfio support, Michael S. Tsirkin, 2021/01/27