[PATCH 2/2] s390x/pci: indicate QEMU supports relaxed translation for passthrough

[Matthew Rosato <mjrosato@linux.ibm.com>]

Specifying this bit in the guest CLP response indicates that the guest
can optionally choose to skip translation and instead use
identity-mapped operations.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
 hw/s390x/s390-pci-vfio.c        | 4 +++-
 include/hw/s390x/s390-pci-clp.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index 7dbbc76823..51ac5ff3eb 100644
--- a/hw/s390x/s390-pci-vfio.c
+++ b/hw/s390x/s390-pci-vfio.c
@@ -224,7 +224,9 @@ static void s390_pci_read_group(S390PCIBusDevice *pbdev,
 
         resgrp = &pbdev->pci_group->zpci_group;
         if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) {
-            resgrp->fr = 1;
+            resgrp->fr = (CLP_RSP_QPCIG_MASK_RTR | CLP_RSP_QPCIG_MASK_REFRESH);
+        } else {
+            resgrp->fr = CLP_RSP_QPCIG_MASK_RTR;
         }
         resgrp->dasm = cap->dasm;
         resgrp->msia = cap->msi_addr;
diff --git a/include/hw/s390x/s390-pci-clp.h b/include/hw/s390x/s390-pci-clp.h
index 03b7f9ba5f..6a635d693b 100644
--- a/include/hw/s390x/s390-pci-clp.h
+++ b/include/hw/s390x/s390-pci-clp.h
@@ -158,6 +158,7 @@ typedef struct ClpRspQueryPciGrp {
 #define CLP_RSP_QPCIG_MASK_NOI 0xfff
     uint16_t i;
     uint8_t version;
+#define CLP_RSP_QPCIG_MASK_RTR     0x20
 #define CLP_RSP_QPCIG_MASK_FRAME   0x2
 #define CLP_RSP_QPCIG_MASK_REFRESH 0x1
     uint8_t fr;
-- 
2.47.0