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[PATCH RESEND v7 07/13] vfio: Query and store the maximum number of poss
From: |
David Hildenbrand |
Subject: |
[PATCH RESEND v7 07/13] vfio: Query and store the maximum number of possible DMA mappings |
Date: |
Tue, 13 Apr 2021 11:55:25 +0200 |
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>
---
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 5af7755227..79628d60ae 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);
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 681432213d..8af11b0a76 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;
--
2.30.2
- [PATCH RESEND v7 00/13] virtio-mem: vfio support, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 01/13] memory: Introduce RamDiscardManager for RAM memory regions, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 02/13] memory: Helpers to copy/free a MemoryRegionSection, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 03/13] virtio-mem: Factor out traversing unplugged ranges, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 04/13] virtio-mem: Don't report errors when ram_block_discard_range() fails, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 05/13] virtio-mem: Implement RamDiscardManager interface, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 06/13] vfio: Support for RamDiscardManager in the !vIOMMU case, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 07/13] vfio: Query and store the maximum number of possible DMA mappings,
David Hildenbrand <=
- [PATCH RESEND v7 08/13] vfio: Sanity check maximum number of DMA mappings with RamDiscardManager, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 09/13] vfio: Support for RamDiscardManager in the vIOMMU case, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 10/13] softmmu/physmem: Don't use atomic operations in ram_block_discard_(disable|require), David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 11/13] softmmu/physmem: Extend ram_block_discard_(require|disable) by two discard types, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 12/13] virtio-mem: Require only coordinated discards, David Hildenbrand, 2021/04/13
- [PATCH RESEND v7 13/13] vfio: Disable only uncoordinated discards for VFIO_TYPE1 iommus, David Hildenbrand, 2021/04/13