Merge tag 'pull-request-2025-03-07' of https://gitlab.com/thuth/qemu into staging

* Bug fixes and some small improvements for functional tests
* Improve performance of s390x PCI passthrough devices with relaxed translation

# -----BEGIN PGP SIGNATURE-----
#
# iQJFBAABCAAvFiEEJ7iIR+7gJQEY8+q5LtnXdP5wLbUFAmfK3dsRHHRodXRoQHJl
# ZGhhdC5jb20ACgkQLtnXdP5wLbUfDQ/8CopnzCKGKFhyM5skrHbhDbUVbul6yV4L
# kIOo7N8OlrNcQB90bj+Udy+mUANHjkmSiBa5lJ/78ej4DFS6CxeVgrl1fSEl36xn
# GjWDwSUiN8pG1O4YtnDqWVTBieGSzbkQr1jHgpeAnvv08s+TtmudP1T8IznWU2v9
# FqD78SdebZ0Kua+ksBgMxwkHd6VMw13vsu6KuT9VBhie40LcDrFOuG8RDz/qo4IO
# Yg9s1Bqcy7Wa4+0ldMXS1plSdIqJBtVc/HDTg1QwH994b4Lvr7ffrFZmuVcd2dbE
# XKQ5jAMOYZqWdlXszkyd8moYGhmevCkQlALhpnbHixnfakfFYX0wTiJB6oCthFQ0
# It0J/ntNsCmJiIHNbPLzsJ1pE5+ureRnGbxVe05n+zfm8MaXL6s4nSdZzHyp8n43
# UZQqVzK55Q34K9O0qoUdCdBCjMKS9v5u95jjJo8+nc8sJoeQTssOoiixwB/E4y21
# 9qSh7CbDjQK4zwuzQ7jKD603zAJH6ivvsHXlMBMXJFBiSMCAoQQ1vyou6yRHswRr
# gLHDwiWUx8SX8ckbbJ/+Zo9+T8JBMvC5hNYG8VoAtlTQusG4bHSbKdPNNH0eHsEp
# f7RlZPRizkcK3w0Nj+u4kXdnnex3QLLSgnyAYq7zEl6V+mho8KqaBezkO7wQDHZy
# +GW5ignQ1Gs=
# =CyiZ
# -----END PGP SIGNATURE-----
# gpg: Signature made Fri 07 Mar 2025 19:51:55 HKT
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2025-03-07' of https://gitlab.com/thuth/qemu:
  s390x/pci: indicate QEMU supports relaxed translation for passthrough
  s390x/pci: add support for guests that request direct mapping
  MAINTAINERS: Add docs/devel/testing/functional.rst to the functional section
  doc: add missing 'Asset' type in function test doc
  tests/functional/test_virtio_balloon: Only use KVM for running this test
  tests/functional: fix race in virtio balloon test
  tests/functional: Increase the timeout of the mips64el_replay test
  tests/functional/test_mips_malta: Add a network test via the pcnet NIC
  tests/functional: Move the code for testing HTTP downloads to a common function
  tests/functional: stop output from zstd command when uncompressing
  tests/functional: drop unused 'get_tag' method
  tests/functional: skip memaddr tests on 32-bit builds
  tests/functional: reduce tuxrun maxmem to work on 32-bit hosts
  tests/functional: set 'qemu_bin' as an object level field
  tests/functional: remove unused 'bin_prefix' variable

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 23 insertions, 5 deletions

diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index 7dbbc76823..6236ac7f1e 100644
--- a/hw/s390x/s390-pci-vfio.c
+++ b/hw/s390x/s390-pci-vfio.c
@@ -132,12 +132,27 @@ static void s390_pci_read_base(S390PCIBusDevice *pbdev,
     pbdev->pft = cap->pft;
 
     /*
+     * If the device is a passthrough ISM device, disallow relaxed
+     * translation.
+     */
+    if (pbdev->pft == ZPCI_PFT_ISM) {
+        pbdev->rtr_avail = false;
+    }
+
+    /*
      * If appropriate, reduce the size of the supported DMA aperture reported
-     * to the guest based upon the vfio DMA limit.
+     * to the guest based upon the vfio DMA limit.  This is applicable for
+     * devices that are guaranteed to not use relaxed translation.  If the
+     * device is capable of relaxed translation then we must advertise the
+     * full aperture.  In this case, if translation is used then we will
+     * rely on the vfio DMA limit counting and use RPCIT CC1 / status 16
+     * to request that the guest free DMA mappings as necessary.
      */
-    vfio_size = pbdev->iommu->max_dma_limit << TARGET_PAGE_BITS;
-    if (vfio_size > 0 && vfio_size < cap->end_dma - cap->start_dma + 1) {
-        pbdev->zpci_fn.edma = cap->start_dma + vfio_size - 1;
+    if (!pbdev->rtr_avail) {
+        vfio_size = pbdev->iommu->max_dma_limit << TARGET_PAGE_BITS;
+        if (vfio_size > 0 && vfio_size < cap->end_dma - cap->start_dma + 1) {
+            pbdev->zpci_fn.edma = cap->start_dma + vfio_size - 1;
+        }
     }
 }
 
@@ -223,8 +238,11 @@ static void s390_pci_read_group(S390PCIBusDevice *pbdev,
         pbdev->pci_group = s390_group_create(pbdev->zpci_fn.pfgid, start_gid);
 
         resgrp = &pbdev->pci_group->zpci_group;
+        if (pbdev->rtr_avail) {
+            resgrp->fr |= CLP_RSP_QPCIG_MASK_RTR;
+        }
         if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) {
-            resgrp->fr = 1;
+            resgrp->fr |= CLP_RSP_QPCIG_MASK_REFRESH;
         }
         resgrp->dasm = cap->dasm;
         resgrp->msia = cap->msi_addr;