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target-arm: Declare virtio-mmio as dma-coherent in dt

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QEMU emulated hardware is always dma coherent with its guest. We do
annotate that correctly on the PCI host controller, but left out
virtio-mmio.

Recent kernels have started to interpret that flag rather than take
dma coherency as granted with virtio-mmio. While that is considered
a kernel bug, as it breaks previously working systems, it showed that
our dt description is incomplete.

This patch adds the respective marker that allows guest OSs to evaluate
that our virtio-mmio devices are indeed cache coherent.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 1486644810-33181-2-git-send-email-agraf@suse.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alexander Graf 2017-02-10 17:40:29 +00:00 committed by Peter Maydell
parent d6f02ce3b8
commit 054bb7b215
2 changed files with 2 additions and 0 deletions
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1
hw/arm/vexpress.c
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@ -452,6 +452,7 @@ static int add_virtio_mmio_node(void *fdt, uint32_t acells, uint32_t scells,
acells, addr, scells, size);
qemu_fdt_setprop_cells(fdt, nodename, "interrupt-parent", intc);
qemu_fdt_setprop_cells(fdt, nodename, "interrupts", 0, irq, 1);
qemu_fdt_setprop(fdt, nodename, "dma-coherent", NULL, 0);
g_free(nodename);
if (rc) {
return -1;

1
hw/arm/virt.c
View File

@ -797,6 +797,7 @@ static void create_virtio_devices(const VirtMachineState *vms, qemu_irq *pic)
qemu_fdt_setprop_cells(vms->fdt, nodename, "interrupts",
GIC_FDT_IRQ_TYPE_SPI, irq,
GIC_FDT_IRQ_FLAGS_EDGE_LO_HI);
qemu_fdt_setprop(vms->fdt, nodename, "dma-coherent", NULL, 0);
g_free(nodename);
}
}