From: Michal Privoznik <mprivozn@redhat.com>
Date: Wed, 21 Jan 2026 12:00:39 +0000 (+0100)
Subject: qemu_command: Generate granule prop for virtio-iommu
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9373d8da6aca6a23c0cf17cddc07aac940d28994;p=thirdparty%2Flibvirt.git

qemu_command: Generate granule prop for virtio-iommu

Resolves: https://issues.redhat.com/browse/RHEL-76269
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
---

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 85f24c6307..069211e139 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6358,6 +6358,7 @@ qemuBuildIOMMUCommandLine(virCommand *cmd,
         virDomainIOMMUDef *iommu = def->iommus[i];
         g_autoptr(virJSONValue) props = NULL;
         g_autoptr(virJSONValue) wrapperProps = NULL;
+        g_autofree char *granule_mode = NULL;
 
         switch (iommu->model) {
         case VIR_DOMAIN_IOMMU_MODEL_INTEL:
@@ -6379,10 +6380,19 @@ qemuBuildIOMMUCommandLine(virCommand *cmd,
             break;
 
         case VIR_DOMAIN_IOMMU_MODEL_VIRTIO:
+            if (iommu->granule != 0) {
+                if (iommu->granule == -1) {
+                    granule_mode = g_strdup("host");
+                } else {
+                    granule_mode = g_strdup_printf("%dk", iommu->granule);
+                }
+            }
+
             if (virJSONValueObjectAdd(&props,
                                       "s:driver", "virtio-iommu",
                                       "s:id", iommu->info.alias,
                                       "p:aw-bits", iommu->aw_bits,
+                                      "S:granule", granule_mode,
                                       NULL) < 0) {
                 return -1;
             }
diff --git a/tests/qemuxmlconfdata/virtio-iommu-aarch64.aarch64-latest.args b/tests/qemuxmlconfdata/virtio-iommu-aarch64.aarch64-latest.args
index 071bc00b34..3c9cc0e9d1 100644
--- a/tests/qemuxmlconfdata/virtio-iommu-aarch64.aarch64-latest.args
+++ b/tests/qemuxmlconfdata/virtio-iommu-aarch64.aarch64-latest.args
@@ -28,7 +28,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
 -rtc base=utc \
 -no-shutdown \
 -boot strict=on \
--device '{"driver":"virtio-iommu","id":"iommu0","aw-bits":48,"bus":"pcie.0","addr":"0x1"}' \
+-device '{"driver":"virtio-iommu","id":"iommu0","aw-bits":48,"granule":"64k","bus":"pcie.0","addr":"0x1"}' \
 -audiodev '{"id":"audio1","driver":"none"}' \
 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
 -msg timestamp=on
diff --git a/tests/qemuxmlconfdata/virtio-iommu-x86_64.x86_64-latest.args b/tests/qemuxmlconfdata/virtio-iommu-x86_64.x86_64-latest.args
index c2dbfd25ad..0d49128149 100644
--- a/tests/qemuxmlconfdata/virtio-iommu-x86_64.x86_64-latest.args
+++ b/tests/qemuxmlconfdata/virtio-iommu-x86_64.x86_64-latest.args
@@ -26,7 +26,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
 -rtc base=utc \
 -no-shutdown \
 -boot strict=on \
--device '{"driver":"virtio-iommu","id":"iommu0","bus":"pcie.0","addr":"0x1"}' \
+-device '{"driver":"virtio-iommu","id":"iommu0","granule":"host","bus":"pcie.0","addr":"0x1"}' \
 -audiodev '{"id":"audio1","driver":"none"}' \
 -global ICH9-LPC.noreboot=off \
 -watchdog-action reset \