From: Shameer Kolothum <skolothumtho@nvidia.com>
Date: Thu, 29 Jan 2026 13:32:05 +0000 (+0000)
Subject: hw/arm/virt: Set msi-gpa property
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ec2700dcbf72c6bbeb00322e5258f999071d9d5;p=thirdparty%2Fqemu.git

hw/arm/virt: Set msi-gpa property

Set the MSI doorbell GPA property for accelerated SMMUv3 devices for use
by KVM MSI setup. Also, since any meaningful use of vfio-pci devices with
an accelerated SMMUv3 requires both KVM and a kernel irqchip, ensure
those are specified when accel=on is selected.

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
Message-id: 20260126104342.253965-19-skolothumtho@nvidia.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 4badc1a734..91fec582ed 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -3061,6 +3061,26 @@ static void virt_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
             object_property_set_link(OBJECT(dev), "secure-memory",
                                      OBJECT(vms->secure_sysmem), NULL);
         }
+        if (object_property_find(OBJECT(dev), "accel") &&
+            object_property_get_bool(OBJECT(dev), "accel", &error_abort)) {
+            hwaddr db_start = 0;
+
+            if (!kvm_enabled() || !kvm_irqchip_in_kernel()) {
+                error_setg(errp, "SMMUv3 accel=on requires KVM with "
+                           "kernel-irqchip=on support");
+                return;
+            }
+
+            if (vms->msi_controller == VIRT_MSI_CTRL_ITS) {
+                /* GITS_TRANSLATER page + offset */
+                db_start = base_memmap[VIRT_GIC_ITS].base + 0x10000 + 0x40;
+            } else if (vms->msi_controller == VIRT_MSI_CTRL_GICV2M) {
+                /* MSI_SETSPI_NS page + offset */
+                db_start = base_memmap[VIRT_GIC_V2M].base + 0x40;
+            }
+            object_property_set_uint(OBJECT(dev), "msi-gpa", db_start,
+                                     &error_abort);
+        }
     }
 }