[Qemu-devel] [PULL 07/12] hw/arm/virt: Declare fwcfg as dma cache coherent in ACPI

[Peter Maydell]

From: Alexander Graf <address@hidden>

Fw-cfg recently learned how to directly access guest memory and does 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 8955a9d..0835e59 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -90,6 +90,7 @@ static void acpi_dsdt_add_fw_cfg(Aml *scope, const 
MemMapEntry *fw_cfg_memmap)
     aml_append(dev, aml_name_decl("_HID", aml_string("QEMU0002")));
     /* device present, functioning, decoding, not shown in UI */
     aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
+    aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
 
     Aml *crs = aml_resource_template();
     aml_append(crs, aml_memory32_fixed(fw_cfg_memmap->base,
-- 
2.7.4