From 13e8ddbd282da692c8199a6cb9ca847334089e29 Mon Sep 17 00:00:00 2001 From: Christoph Schlameuss Date: Thu, 12 Jun 2025 11:48:41 +0200 Subject: [PATCH 02/16] s390x/pci: indicate QEMU supports relaxed translation for passthrough MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Christoph Schlameuss RH-MergeRequest: 376: Draft: KVM: Performance Enhanced Refresh PCI Translation RH-Jira: RHEL-11430 RH-Acked-by: Thomas Huth RH-Acked-by: Cédric Le Goater RH-Commit: [2/2] afd514268347d0b434a60d7c6c09d20b84e5d902 (cschlame/qemu-kvm) JIRA: https://issues.redhat.com/browse/RHEL-11430 commit d9b5dfc7122559e5b5959ecf534788b90c3dd102 Author: Matthew Rosato Date: Wed Feb 26 16:00:13 2025 -0500 s390x/pci: indicate QEMU supports relaxed translation for passthrough 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 Reviewed-by: Niklas Schnelle Signed-off-by: Matthew Rosato Message-ID: <20250226210013.238349-3-mjrosato@linux.ibm.com> Signed-off-by: Thomas Huth Signed-off-by: Christoph Schlameuss --- 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 *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; 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; -- 2.48.1