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qdev: Introduce DEFINE_PROP_RESERVED_REGION

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Introduce a new property defining a reserved region:
<low address>:<high address>:<type>.

This will be used to encode reserved IOVA regions.

For instance, in virtio-iommu use case, reserved IOVA regions
will be passed by the machine code to the virtio-iommu-pci
device (an array of those). The type of the reserved region
will match the virtio_iommu_probe_resv_mem subtype value:
- VIRTIO_IOMMU_RESV_MEM_T_RESERVED (0)
- VIRTIO_IOMMU_RESV_MEM_T_MSI (1)

on PC/Q35 machine, this will be used to inform the
virtio-iommu-pci device it should bypass the MSI region.
The reserved region will be: 0xfee00000:0xfeefffff:1.

On ARM, we can declare the ITS MSI doorbell as an MSI
region to prevent MSIs from being mapped on guest side.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20200629070404.10969-2-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2020-07-03 16:59:41 +01:00 • committed by Peter Maydell
parent 6552bbc6a3
commit f78069253c
4 changed files with 99 additions and 0 deletions
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3
include/hw/qdev-properties.h
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@ -19,6 +19,7 @@ extern const PropertyInfo qdev_prop_string;
extern const PropertyInfo qdev_prop_chr;
extern const PropertyInfo qdev_prop_tpm;
extern const PropertyInfo qdev_prop_macaddr;
extern const PropertyInfo qdev_prop_reserved_region;
extern const PropertyInfo qdev_prop_on_off_auto;
extern const PropertyInfo qdev_prop_multifd_compression;
extern const PropertyInfo qdev_prop_losttickpolicy;
@ -184,6 +185,8 @@ extern const PropertyInfo qdev_prop_pcie_link_width;
DEFINE_PROP(_n, _s, _f, qdev_prop_drive_iothread, BlockBackend *)
#define DEFINE_PROP_MACADDR(_n, _s, _f) \
DEFINE_PROP(_n, _s, _f, qdev_prop_macaddr, MACAddr)
#define DEFINE_PROP_RESERVED_REGION(_n, _s, _f) \
DEFINE_PROP(_n, _s, _f, qdev_prop_reserved_region, ReservedRegion)
#define DEFINE_PROP_ON_OFF_AUTO(_n, _s, _f, _d) \
DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_on_off_auto, OnOffAuto)
#define DEFINE_PROP_MULTIFD_COMPRESSION(_n, _s, _f, _d) \