[v8,7/8] s390x/pci: reflect proper maxstbl for groups of interpreted devices

Commit Message

Matthew Rosato Sept. 2, 2022, 5:27 p.m. UTC

The maximum supported store block length might be different depending
on whether the instruction is interpretively executed (firmware-reported
maximum) or handled via userspace intercept (host kernel API maximum).
Choose the best available value during group creation.

Reviewed-by: Pierre Morel <[e-mail]>
Signed-off-by: Matthew Rosato <[e-mail]>
---
 hw/s390x/s390-pci-vfio.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Patch

diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index 985980f021..212dd053f7 100644
--- a/hw/s390x/s390-pci-vfio.c
+++ b/hw/s390x/s390-pci-vfio.c
@@ -213,7 +213,11 @@  static void s390_pci_read_group(S390PCIBusDevice *pbdev,
         resgrp->msia = cap->msi_addr;
         resgrp->mui = cap->mui;
         resgrp->i = cap->noi;
-        resgrp->maxstbl = cap->maxstbl;
+        if (pbdev->interp && hdr->version >= 2) {
+            resgrp->maxstbl = cap->imaxstbl;
+        } else {
+            resgrp->maxstbl = cap->maxstbl;
+        }
         resgrp->version = cap->version;
         resgrp->dtsm = ZPCI_DTSM;
     }