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From: Matthew Rosato <mjrosato@linux.ibm.com>
To: qemu-s390x@nongnu.org
Cc: farman@linux.ibm.com, schnelle@linux.ibm.com, thuth@redhat.com,
pasic@linux.ibm.com, borntraeger@linux.ibm.com,
richard.henderson@linaro.org, david@redhat.com, iii@linux.ibm.com,
clg@redhat.com, qemu-devel@nongnu.org
Subject: [PATCH v5 2/2] s390x/pci: indicate QEMU supports relaxed translation
for passthrough
Date: Wed, 26 Feb 2025 16:00:13 -0500
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Specifying this bit in the guest CLP response indicates that the guest
can optionally choose to skip translation and instead use
identity-mapped operations.
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
hw/s390x/s390-pci-vfio.c | 5 ++++-
include/hw/s390x/s390-pci-clp.h | 1 +
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index 443e222912..6236ac7f1e 100644
--- a/hw/s390x/s390-pci-vfio.c
+++ b/hw/s390x/s390-pci-vfio.c
@@ -238,8 +238,11 @@ static void s390_pci_read_group(S390PCIBusDevice *pbde=
v,
pbdev->pci_group =3D s390_group_create(pbdev->zpci_fn.pfgid, start=
_gid);
=20
resgrp =3D &pbdev->pci_group->zpci_group;
+ if (pbdev->rtr_avail) {
+ resgrp->fr |=3D CLP_RSP_QPCIG_MASK_RTR;
+ }
if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) {
- resgrp->fr =3D 1;
+ resgrp->fr |=3D CLP_RSP_QPCIG_MASK_REFRESH;
}
resgrp->dasm =3D cap->dasm;
resgrp->msia =3D cap->msi_addr;
diff --git a/include/hw/s390x/s390-pci-clp.h b/include/hw/s390x/s390-pci-cl=
p.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;
--=20
2.48.1