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[Qemu-devel] [PATCH v2 2/4] hw/arm/virt: Declare virtio-mmio as dma cach

From: Alexander Graf
Subject: [Qemu-devel] [PATCH v2 2/4] hw/arm/virt: Declare virtio-mmio as dma cache coherent in ACPI
Date: Thu, 9 Feb 2017 13:53:28 +0100

Virtio-mmio devices can directly access guest memory and do so in cache
coherent fashion. Tell the guest about that fact when it's using ACPI.

Signed-off-by: Alexander Graf <address@hidden>
 hw/arm/virt-acpi-build.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 07a10ac..8955a9d 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -135,6 +135,7 @@ static void acpi_dsdt_add_virtio(Aml *scope,
         Aml *dev = aml_device("VR%02u", i);
         aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0005")));
         aml_append(dev, aml_name_decl("_UID", aml_int(i)));
+        aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
         Aml *crs = aml_resource_template();
         aml_append(crs, aml_memory32_fixed(base, size, AML_READ_WRITE));

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