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virtio-iommu: Implement RESV_MEM probe request

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This patch implements the PROBE request. At the moment,
only THE RESV_MEM property is handled. The first goal is
to report iommu wide reserved regions such as the MSI regions
set by the machine code. On x86 this will be the IOAPIC MSI
region, [0xFEE00000 - 0xFEEFFFFF], on ARM this may be the ITS
doorbell.

In the future we may introduce per device reserved regions.
This will be useful when protecting host assigned devices
which may expose their own reserved regions

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20200629070404.10969-3-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2020-07-03 16:59:42 +01:00 • committed by Peter Maydell
parent f78069253c
commit 1733eebb9e
3 changed files with 93 additions and 4 deletions
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2
include/hw/virtio/virtio-iommu.h
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@ -53,6 +53,8 @@ typedef struct VirtIOIOMMU {
GHashTable *as_by_busptr;
IOMMUPciBus *iommu_pcibus_by_bus_num[PCI_BUS_MAX];
PCIBus *primary_bus;
ReservedRegion *reserved_regions;
uint32_t nb_reserved_regions;
GTree *domains;
QemuMutex mutex;
GTree *endpoints;