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hw/misc/ivshmem-flat: Add ivshmem-flat device

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Add a new device, ivshmem-flat, which is similar to the ivshmem PCI but
does not require a PCI bus. It's meant to be used on machines like those
with Cortex-M MCUs, which usually lack a PCI/PCIe bus, e.g. lm3s6965evb
and mps2-an385.

The device currently only supports the sysbus bus.

The new device, just like the ivshmem PCI device, supports both peer
notification via hardware interrupts and shared memory.

The device shared memory size can be set using the 'shmem-size' option
and it defaults to 4 MiB, which is the default size of shmem allocated
by the ivshmem server.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1134
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
[PMD: Rebased updating Property and using DEFINE_TYPES macro]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20241216141818.111255-2-gustavo.romero@linaro.org>
This commit is contained in:
Gustavo Romero 2023-11-27 05:20:20 +00:00 • committed by Philippe Mathieu-Daudé
parent ff871d0462
commit e6c33efed3
7 changed files with 601 additions and 0 deletions
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5
hw/misc/Kconfig
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@ -72,6 +72,11 @@ config IVSHMEM_DEVICE
default y if PCI_DEVICES
depends on PCI && LINUX && IVSHMEM && MSI_NONBROKEN
config IVSHMEM_FLAT_DEVICE
bool
default y
depends on LINUX && IVSHMEM
config ECCMEMCTL
bool