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hw/arm/virt: Declare virtio-mmio as dma cache coherent in ACPI 

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 <agraf@suse.de>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Shannon Zhao <shannon.zhao@linaro.org>
Message-id: 1486644810-33181-3-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 054bb7b215
commit 76266d9913
1 changed files with 1 additions and 0 deletions
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hw/arm/virt-acpi-build.c
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@ -135,6 +135,7 @@ static void acpi_dsdt_add_virtio(Aml *scope,
Aml *dev = aml_device("VR%02u", i); Aml *dev = aml_device("VR%02u", i);
aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0005"))); 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("_UID", aml_int(i)));
aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
Aml *crs = aml_resource_template(); Aml *crs = aml_resource_template();
aml_append(crs, aml_memory32_fixed(base, size, AML_READ_WRITE)); aml_append(crs, aml_memory32_fixed(base, size, AML_READ_WRITE));