feat: Enable ACPI by default for LoongArch virt machines

        Add ACPI default enable for LoongArch64 virt machines to fix black
        screen issue after GRUB boot. LoongArch virt requires ACPI for proper
        display initialization - without ACPI, the guest DRM driver cannot
        initialize the display controller.

        The patch modifies qemuDomainDefAddDefaultDevices() to set
        FEATURE_ACPI to VIR_TRISTATE_SWITCH_ON for LoongArch virt machines.
        This aligns with how libvirt 10.7.0 handles LoongArch display support.

        Log: Enable ACPI by default for LoongArch virt to fix display initialization

        Influence:
        1. Test LoongArch64 VM display works correctly after GRUB boot
        2. Verify ACPI is enabled in QEMU command line for LoongArch virt
        3. Check display controller initialization in guest dmesg logs
        4. Validate no regression on other architectures (x86, ARM, RISC-V)
        5. Test virt-manager can create and run LoongArch64 VMs with display

        feat: 为 LoongArch virt 机器默认启用 ACPI

        为 LoongArch64 virt 机器添加 ACPI 默认启用，修复 GRUB 启动后黑屏问题。
        LoongArch virt 需要 ACPI 来正确初始化显示 - 没有 ACPI，客 DRM 驱动
        无法初始化显示控制器。

        该补丁修改 qemuDomainDefAddDefaultDevices() 为 LoongArch virt 机器
        设置 FEATURE_ACPI 为 VIR_TRISTATE_SWITCH_ON。
        这与 libvirt 10.7.0 处理 LoongArch 显示支持的方式一致。

        Log: 为 LoongArch virt 默认启用 ACPI 以修复显示初始化

        Influence:
        1. 测试 LoongArch64 虚拟机显示在 GRUB 启动后正常工作
        2. 验证 ACPI 在 LoongArch virt 的 QEMU 命令行中已启用
        3. 在客 dmesg 日志中检查显示控制器初始化
        4. 验证其他架构无回归（x86, ARM, RISC-V）
        5. 测试 virt-manager 可以创建并运行带显示的 LoongArch64 虚拟机

        repo: libvirt #master

Author: Zeno-sole

debian/changelog

@@ -1,3 +1,12 @@
+libvirt (10.7.0+really9.10.0-1deepin16) unstable; urgency=medium
+
+  * Enable ACPI by default for LoongArch virt machines
+    - Fixes black screen issue after GRUB boot on LoongArch virt machines
+    - LoongArch virt requires ACPI for proper display initialization
+    - Without ACPI, guest DRM driver cannot initialize display controller
+
+ -- lichenggang <lichenggang@uniontech.com>  Fri, 15 May 2026 10:30:00 +0800
+
 libvirt (10.7.0+really9.10.0-1deepin15) unstable; urgency=medium
 
   * Fix virtio-iommu test expected output for LoongArch support

debian/patches/enable-acpi-for-loongarch-virt.patch

@@ -0,0 +1,23 @@
+
+--- libvirt-10.7.0+really9.10.0.orig/src/qemu/qemu_domain.c
++++ libvirt-10.7.0+really9.10.0/src/qemu/qemu_domain.c
+@@ -4161,11 +4161,14 @@ qemuDomainDefAddDefaultDevices(virQEMUDr
+         break;
+ 
+     case VIR_ARCH_LOONGARCH64:
+-        addPCIeRoot = true;
+-        if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_QEMU_XHCI))
+-            usbModel = VIR_DOMAIN_CONTROLLER_MODEL_USB_QEMU_XHCI;
+-        else
+-            addDefaultUSB = false;
++        addDefaultUSB = false;
++        if (qemuDomainIsLoongArchVirt(def)) {
++            addPCIeRoot = virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_GPEX);
++            /* LoongArch virt requires ACPI for proper display initialization */
++            def->features[VIR_DOMAIN_FEATURE_ACPI] = VIR_TRISTATE_SWITCH_ON;
++            if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_QEMU_XHCI))
++                usbModel = VIR_DOMAIN_CONTROLLER_MODEL_USB_QEMU_XHCI;
++        }
+         break;
+ 
+     case VIR_ARCH_ARMV6L:

debian/patches/series

@@ -14,3 +14,4 @@ backport/0003-src-Add-ARM-CCA-support-in-domain-schema.patch
 fix-firmware-descriptor-parsing.patch
 add-loongarch64-arch-support.patch
 fix-virtio-iommu-test-expected-output.patch
+enable-acpi-for-loongarch-virt.patch