[PATCH rfcv2 08/20] iommufd: Implement query of HOST_IOMMU_DEVICE_CAP_ERRATA

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

Implement query of HOST_IOMMU_DEVICE_CAP_ERRATA for IOMMUFD
backed host IOMMU device.

Query on this capability is not supported for legacy backend
because there is no plan to support nesting with leacy backend
backed host device.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/system/host_iommu_device.h | 2 ++
 backends/iommufd.c                 | 2 ++
 hw/vfio/iommufd.c                  | 1 +
 3 files changed, 5 insertions(+)

diff --git a/include/system/host_iommu_device.h b/include/system/host_iommu_device.h
index 18f8b5e5cf..250600fc1d 100644
--- a/include/system/host_iommu_device.h
+++ b/include/system/host_iommu_device.h
@@ -32,6 +32,7 @@ typedef struct HostIOMMUDeviceCaps {
     uint64_t hw_caps;
     bool nesting;
     bool fs1gp;
+    uint32_t errata;
 } HostIOMMUDeviceCaps;
 
 #define TYPE_HOST_IOMMU_DEVICE "host-iommu-device"
@@ -130,6 +131,7 @@ struct HostIOMMUDeviceClass {
 #define HOST_IOMMU_DEVICE_CAP_AW_BITS           1
 #define HOST_IOMMU_DEVICE_CAP_NESTING           2
 #define HOST_IOMMU_DEVICE_CAP_FS1GP             3
+#define HOST_IOMMU_DEVICE_CAP_ERRATA            4
 
 #define HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX       64
 #endif
diff --git a/backends/iommufd.c b/backends/iommufd.c
index 0a1a40cbba..3c23caef96 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -374,6 +374,8 @@ static int hiod_iommufd_get_cap(HostIOMMUDevice *hiod, int cap, Error **errp)
         return caps->nesting;
     case HOST_IOMMU_DEVICE_CAP_FS1GP:
         return caps->fs1gp;
+    case HOST_IOMMU_DEVICE_CAP_ERRATA:
+        return caps->errata;
     default:
         error_setg(errp, "%s: unsupported capability %x", hiod->name, cap);
         return -EINVAL;
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index df6a12d200..58bff030e1 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -848,6 +848,7 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
     case IOMMU_HW_INFO_TYPE_INTEL_VTD:
         caps->nesting = !!(data.vtd.ecap_reg & VTD_ECAP_NEST);
         caps->fs1gp = !!(data.vtd.cap_reg & VTD_CAP_FS1GP);
+        caps->errata = data.vtd.flags & IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17;
         break;
     case IOMMU_HW_INFO_TYPE_ARM_SMMUV3:
     case IOMMU_HW_INFO_TYPE_NONE:
-- 
2.34.1