[SeaBIOS] [PATCH] virtio: IOMMU support

[Jason Wang]

Since we don't enable IOMMU at all, we can then simply enable the
IOMMU support by claiming the support of VIRITO_F_IOMMU_PLATFORM. This
fixes booting failure when iommu_platform is set from qemu cli.

Signed-off-by: Jason Wang <jasowang at redhat.com>
---
 src/hw/virtio-blk.c  | 3 ++-
 src/hw/virtio-ring.h | 1 +
 src/hw/virtio-scsi.c | 3 ++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/hw/virtio-blk.c b/src/hw/virtio-blk.c
index dca7855..901b8f5 100644
--- a/src/hw/virtio-blk.c
+++ b/src/hw/virtio-blk.c
@@ -118,13 +118,14 @@ init_virtio_blk(void *data)
         struct vp_device *vp = &vdrive->vp;
         u64 features = vp_get_features(vp);
         u64 version1 = 1ull << VIRTIO_F_VERSION_1;
+        u64 iommu_platform = 1ull << VIRTIO_F_IOMMU_PLATFORM;
         u64 blk_size = 1ull << VIRTIO_BLK_F_BLK_SIZE;
         if (!(features & version1)) {
             dprintf(1, "modern device without virtio_1 feature bit: %pP\n", pci);
             goto fail;
         }
 
-        features = features & (version1 | blk_size);
+        features = features & (version1 | iommu_platform | blk_size);
         vp_set_features(vp, features);
         status |= VIRTIO_CONFIG_S_FEATURES_OK;
         vp_set_status(vp, status);
diff --git a/src/hw/virtio-ring.h b/src/hw/virtio-ring.h
index 7665fd5..8604a01 100644
--- a/src/hw/virtio-ring.h
+++ b/src/hw/virtio-ring.h
@@ -18,6 +18,7 @@
 
 /* v1.0 compliant. */
 #define VIRTIO_F_VERSION_1              32
+#define VIRTIO_F_IOMMU_PLATFORM         33
 
 #define MAX_QUEUE_NUM      (128)
 
diff --git a/src/hw/virtio-scsi.c b/src/hw/virtio-scsi.c
index 7490ec0..4eea5c3 100644
--- a/src/hw/virtio-scsi.c
+++ b/src/hw/virtio-scsi.c
@@ -163,12 +163,13 @@ init_virtio_scsi(void *data)
     if (vp->use_modern) {
         u64 features = vp_get_features(vp);
         u64 version1 = 1ull << VIRTIO_F_VERSION_1;
+        u64 iommu_platform = 1ull << VIRTIO_F_IOMMU_PLATFORM;
         if (!(features & version1)) {
             dprintf(1, "modern device without virtio_1 feature bit: %pP\n", pci);
             goto fail;
         }
 
-        vp_set_features(vp, version1);
+        vp_set_features(vp, features & (version1 | iommu_platform));
         status |= VIRTIO_CONFIG_S_FEATURES_OK;
         vp_set_status(vp, status);
         if (!(vp_get_status(vp) & VIRTIO_CONFIG_S_FEATURES_OK)) {
-- 
2.7.4