[PATCH v3 19/20] Workaround for ERRATA_772415_SPR17

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

On a system influenced by ERRATA_772415, IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17
is repored by IOMMU_DEVICE_GET_HW_INFO. Due to this errata, even the readonly
range mapped on stage-2 page table could still be written.

Reference from 4th Gen Intel Xeon Processor Scalable Family Specification
Update, Errata Details, SPR17.
https://edc.intel.com/content/www/us/en/design/products-and-solutions/processors-and-chipsets/eagle-stream/sapphire-rapids-specification-update/

Also copied the SPR17 details from above link:
"Problem: When remapping hardware is configured by system software in
scalable mode as Nested (PGTT=011b) and with PWSNP field Set in the
PASID-table-entry, it may Set Accessed bit and Dirty bit (and Extended
Access bit if enabled) in first-stage page-table entries even when
second-stage mappings indicate that corresponding first-stage page-table
is Read-Only.

Implication: Due to this erratum, pages mapped as Read-only in second-stage
page-tables may be modified by remapping hardware Access/Dirty bit updates.

Workaround: None identified. System software enabling nested translations
for a VM should ensure that there are no read-only pages in the
corresponding second-stage mappings."

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/vfio/iommufd.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index c172c177fc..a28641b5f5 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -325,6 +325,7 @@ static bool iommufd_cdev_autodomains_get(VFIODevice *vbasedev,
 {
     ERRP_GUARD();
     IOMMUFDBackend *iommufd = vbasedev->iommufd;
+    struct iommu_hw_info_vtd vtd;
     uint32_t type, flags = 0;
     uint64_t hw_caps;
     VFIOIOASHwpt *hwpt;
@@ -372,10 +373,15 @@ static bool iommufd_cdev_autodomains_get(VFIODevice *vbasedev,
      * instead.
      */
     if (!iommufd_backend_get_device_info(vbasedev->iommufd, vbasedev->devid,
-                                         &type, NULL, 0, &hw_caps, errp)) {
+                                         &type, &vtd, sizeof(vtd), &hw_caps,
+                                         errp)) {
         return false;
     }
 
+    if (vtd.flags & IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17) {
+        container->bcontainer.bypass_ro = true;
+    }
+
     if (hw_caps & IOMMU_HW_CAP_DIRTY_TRACKING) {
         flags = IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
     }
-- 
2.47.1