From 8e26317a3d619a2cc00d1270a00886c7a1241a97 Mon Sep 17 00:00:00 2001
From: Ivan Kardykov <kardykov@tabit.pro>
Date: Wed, 7 Jul 2021 15:24:02 +0300
Subject: [PATCH] Add Intel GVT-g support (xengt device)

---
 qemu/patches/qemu-stub-xengt-support.patch | 91 ++++++++++++++++++++++
 qemu/patches/series                        |  1 +
 rpm_spec/xen-hvm-stubdom-linux.spec.in     |  2 +
 3 files changed, 94 insertions(+)
 create mode 100644 qemu/patches/qemu-stub-xengt-support.patch

diff --git a/qemu/patches/qemu-stub-xengt-support.patch b/qemu/patches/qemu-stub-xengt-support.patch
new file mode 100644
index 0000000..6b3c5dd
--- /dev/null
+++ b/qemu/patches/qemu-stub-xengt-support.patch
@@ -0,0 +1,91 @@
+From 01818d9d2af100d56e2701690bbac4a87576f0e9 Mon Sep 17 00:00:00 2001
+From: Ivan Kardykov <kardykov@tabit.pro>
+Date: Sun, 2 Jan 2022 23:36:21 +0300
+Subject: [PATCH] Add stubdom xengt support
+
+---
+ hw/pci/pci.c            | 4 ++++
+ include/sysemu/sysemu.h | 2 +-
+ qemu-options.hx         | 7 ++++++-
+ softmmu/vl.c            | 5 +++++
+ 4 files changed, 16 insertions(+), 2 deletions(-)
+
+diff --git a/hw/pci/pci.c b/hw/pci/pci.c
+index 23d2ae2ab..40838559a 100644
+--- a/hw/pci/pci.c
++++ b/hw/pci/pci.c
+@@ -1062,6 +1062,10 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev,
+     if (devfn < 0) {
+         for(devfn = bus->devfn_min ; devfn < ARRAY_SIZE(bus->devices);
+             devfn += PCI_FUNC_MAX) {
++            /* If vGT/XenGT is in use, reserve 00:02.* for the IGD */
++            if (vga_interface_type == VGA_VGT && devfn == 0x10)
++                continue;
++
+             if (pci_bus_devfn_available(bus, devfn) &&
+                    !pci_bus_devfn_reserved(bus, devfn)) {
+                 goto found;
+diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
+index 8fae66717..a6d228927 100644
+--- a/include/sysemu/sysemu.h
++++ b/include/sysemu/sysemu.h
+@@ -28,7 +28,7 @@ extern int autostart;
+ 
+ typedef enum {
+     VGA_NONE, VGA_STD, VGA_CIRRUS, VGA_VMWARE, VGA_XENFB, VGA_QXL,
+-    VGA_TCX, VGA_CG3, VGA_DEVICE, VGA_VIRTIO,
++    VGA_TCX, VGA_CG3, VGA_DEVICE, VGA_VIRTIO, VGA_VGT,
+     VGA_TYPE_MAX,
+ } VGAInterfaceType;
+ 
+diff --git a/qemu-options.hx b/qemu-options.hx
+index 83aa59a92..07d2696e4 100644
+--- a/qemu-options.hx
++++ b/qemu-options.hx
+@@ -2131,7 +2131,7 @@ SRST
+ ERST
+ 
+ DEF("vga", HAS_ARG, QEMU_OPTION_vga,
+-    "-vga [std|cirrus|vmware|qxl|xenfb|tcx|cg3|virtio|none]\n"
++    "-vga [std|cirrus|vmware|qxl|xenfb|tcx|cg3|virtio|xengt|none]\n"
+     "                select video card type\n", QEMU_ARCH_ALL)
+ SRST
+ ``-vga type``
+@@ -2175,6 +2175,11 @@ SRST
+     ``virtio``
+         Virtio VGA card.
+ 
++    ``xengt``
++        Intel IGD card based on mediated pass-through technique. A single
++        IGD card can be used to accelerate multiple VMs, which each run
++        native graphics driver inside.
++
+     ``none``
+         Disable VGA card.
+ ERST
+diff --git a/softmmu/vl.c b/softmmu/vl.c
+index 5ca11e746..116095d5d 100644
+--- a/softmmu/vl.c
++++ b/softmmu/vl.c
+@@ -906,6 +906,10 @@ static const VGAInterfaceInfo vga_interfaces[VGA_TYPE_MAX] = {
+         .opt_name = "xenfb",
+         .name = "Xen paravirtualized framebuffer",
+     },
++    [VGA_VGT] = {
++        .opt_name = "xengt",
++        .name = "Intel GVT-g",
++    },
+ };
+ 
+ static bool vga_interface_available(VGAInterfaceType t)
+@@ -960,6 +964,7 @@ static void select_vgahw(const MachineClass *machine_class, const char *p)
+                 exit(1);
+             }
+             vga_interface_type = t;
++            printf("%s vga is %s\n", __func__, ti->opt_name);
+             break;
+         }
+     }
+-- 
+2.31.1
+
diff --git a/qemu/patches/series b/qemu/patches/series
index c4a67c5..e383f41 100644
--- a/qemu/patches/series
+++ b/qemu/patches/series
@@ -18,3 +18,4 @@
 0018-pc-bios-ignore-prebuilt-binaries.patch
 seabios-python3.patch
 vgasrc-ignore-.node.gnu.property-binutils-2.36-suppo.patch
+qemu-stub-xengt-support.patch
diff --git a/rpm_spec/xen-hvm-stubdom-linux.spec.in b/rpm_spec/xen-hvm-stubdom-linux.spec.in
index 3d8dfb8..2035914 100644
--- a/rpm_spec/xen-hvm-stubdom-linux.spec.in
+++ b/rpm_spec/xen-hvm-stubdom-linux.spec.in
@@ -15,6 +15,8 @@ URL: https://www.qubes-os.org/
 
 Requires: xen-libs >= 2001:4.14.3-5
 
+Provides: xen-hvm-stubdom-gvt
+
 BuildRequires: quilt
 
 # QEMU