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From: David Hildenbrand <david@redhat.com>
To: qemu-devel@nongnu.org
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
	Wei Yang <richard.weiyang@linux.alibaba.com>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	David Hildenbrand <david@redhat.com>,
	"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
	Peter Xu <peterx@redhat.com>, Auger Eric <eric.auger@redhat.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	teawater <teawaterz@linux.alibaba.com>,
	Igor Mammedov <imammedo@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Marek Kedzierski <mkedzier@redhat.com>
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	[thread overview]
Message-ID: <20210413095531.25603-8-david@redhat.com> (raw)
In-Reply-To: <20210413095531.25603-1-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>
---
 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



  parent reply	other threads:[~2021-04-13 10:04 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13  9:55 [PATCH RESEND v7 00/13] virtio-mem: vfio support David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 01/13] memory: Introduce RamDiscardManager for RAM memory regions David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 02/13] memory: Helpers to copy/free a MemoryRegionSection David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 03/13] virtio-mem: Factor out traversing unplugged ranges David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 04/13] virtio-mem: Don't report errors when ram_block_discard_range() fails David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 05/13] virtio-mem: Implement RamDiscardManager interface David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 06/13] vfio: Support for RamDiscardManager in the !vIOMMU case David Hildenbrand
2021-04-13  9:55 ` David Hildenbrand [this message]
2021-04-13  9:55 ` [PATCH RESEND v7 08/13] vfio: Sanity check maximum number of DMA mappings with RamDiscardManager David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 09/13] vfio: Support for RamDiscardManager in the vIOMMU case David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 10/13] softmmu/physmem: Don't use atomic operations in ram_block_discard_(disable|require) David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 11/13] softmmu/physmem: Extend ram_block_discard_(require|disable) by two discard types David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 12/13] virtio-mem: Require only coordinated discards David Hildenbrand
2021-04-13  9:55 ` [PATCH RESEND v7 13/13] vfio: Disable only uncoordinated discards for VFIO_TYPE1 iommus David Hildenbrand

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