[Qemu-devel] [PULL 06/12] hw/arm/virt: Declare virtio-mmio as dma cache coherent in ACPI

[Peter Maydell]

From: Alexander Graf <address@hidden>

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>
Reviewed-by: Laszlo Ersek <address@hidden>
Reviewed-by: Ard Biesheuvel <address@hidden>
Reviewed-by: Shannon Zhao <address@hidden>
Message-id: address@hidden
Signed-off-by: Peter Maydell <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));
-- 
2.7.4