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[PATCH v2 09/22] vfio/common: init HostIOMMUContext per-container
From: |
Liu Yi L |
Subject: |
[PATCH v2 09/22] vfio/common: init HostIOMMUContext per-container |
Date: |
Sun, 29 Mar 2020 21:24:48 -0700 |
In this patch, QEMU firstly gets iommu info from kernel to check the
supported capabilities by a VFIO_IOMMU_TYPE1_NESTING iommu. And inits
HostIOMMUContet instance.
Cc: Kevin Tian <address@hidden>
Cc: Jacob Pan <address@hidden>
Cc: Peter Xu <address@hidden>
Cc: Eric Auger <address@hidden>
Cc: Yi Sun <address@hidden>
Cc: David Gibson <address@hidden>
Cc: Alex Williamson <address@hidden>
Signed-off-by: Liu Yi L <address@hidden>
---
hw/vfio/common.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 99 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 5f3534d..44b142c 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1226,10 +1226,89 @@ static int
vfio_host_iommu_ctx_pasid_free(HostIOMMUContext *iommu_ctx,
return 0;
}
+/**
+ * Get iommu info from host. Caller of this funcion should free
+ * the memory pointed by the returned pointer stored in @info
+ * after a successful calling when finished its usage.
+ */
+static int vfio_get_iommu_info(VFIOContainer *container,
+ struct vfio_iommu_type1_info **info)
+{
+
+ size_t argsz = sizeof(struct vfio_iommu_type1_info);
+
+ *info = g_malloc0(argsz);
+
+retry:
+ (*info)->argsz = argsz;
+
+ if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
+ g_free(*info);
+ *info = NULL;
+ return -errno;
+ }
+
+ if (((*info)->argsz > argsz)) {
+ argsz = (*info)->argsz;
+ *info = g_realloc(*info, argsz);
+ goto retry;
+ }
+
+ return 0;
+}
+
+static struct vfio_info_cap_header *
+vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
+{
+ struct vfio_info_cap_header *hdr;
+ void *ptr = info;
+
+ if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
+ return NULL;
+ }
+
+ for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
+ if (hdr->id == id) {
+ return hdr;
+ }
+ }
+
+ return NULL;
+}
+
+static int vfio_get_nesting_iommu_cap(VFIOContainer *container,
+ struct vfio_iommu_type1_info_cap_nesting *cap_nesting)
+{
+ struct vfio_iommu_type1_info *info;
+ struct vfio_info_cap_header *hdr;
+ struct vfio_iommu_type1_info_cap_nesting *cap;
+ int ret;
+
+ ret = vfio_get_iommu_info(container, &info);
+ if (ret) {
+ return ret;
+ }
+
+ hdr = vfio_get_iommu_info_cap(info,
+ VFIO_IOMMU_TYPE1_INFO_CAP_NESTING);
+ if (!hdr) {
+ g_free(info);
+ return -errno;
+ }
+
+ cap = container_of(hdr,
+ struct vfio_iommu_type1_info_cap_nesting, header);
+ *cap_nesting = *cap;
+
+ g_free(info);
+ return 0;
+}
+
static int vfio_init_container(VFIOContainer *container, int group_fd,
Error **errp)
{
int iommu_type, ret;
+ uint64_t flags = 0;
iommu_type = vfio_get_iommu_type(container, errp);
if (iommu_type < 0) {
@@ -1257,6 +1336,26 @@ static int vfio_init_container(VFIOContainer *container,
int group_fd,
return -errno;
}
+ if (iommu_type == VFIO_TYPE1_NESTING_IOMMU) {
+ struct vfio_iommu_type1_info_cap_nesting nesting = {
+ .nesting_capabilities = 0x0,
+ .stage1_formats = 0, };
+
+ ret = vfio_get_nesting_iommu_cap(container, &nesting);
+ if (ret) {
+ error_setg_errno(errp, -ret,
+ "Failed to get nesting iommu cap");
+ return ret;
+ }
+
+ flags |= (nesting.nesting_capabilities & VFIO_IOMMU_PASID_REQS) ?
+ HOST_IOMMU_PASID_REQUEST : 0;
+ host_iommu_ctx_init(&container->iommu_ctx,
+ sizeof(container->iommu_ctx),
+ TYPE_VFIO_HOST_IOMMU_CONTEXT,
+ flags);
+ }
+
container->iommu_type = iommu_type;
return 0;
}
--
2.7.4
[PATCH v2 05/22] hw/pci: modify pci_setup_iommu() to set PCIIOMMUOps, Liu Yi L, 2020/03/30
[PATCH v2 12/22] intel_iommu: process PASID cache invalidation, Liu Yi L, 2020/03/30
[PATCH v2 11/22] intel_iommu: add virtual command capability support, Liu Yi L, 2020/03/30