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s390x/pci: indicate QEMU supports relaxed translation for passthrough

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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>
Message-ID: <20250226210013.238349-3-mjrosato@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Matthew Rosato 2025-02-26 16:00:13 -05:00 committed by Thomas Huth
parent dfcee1ea4c
commit d9b5dfc712
2 changed files with 5 additions and 1 deletions
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5
hw/s390x/s390-pci-vfio.c
View File

@ -238,8 +238,11 @@ static void s390_pci_read_group(S390PCIBusDevice *pbdev,
pbdev->pci_group = s390_group_create(pbdev->zpci_fn.pfgid, start_gid); pbdev->pci_group = s390_group_create(pbdev->zpci_fn.pfgid, start_gid);
resgrp = &pbdev->pci_group->zpci_group; 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) { if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) {
resgrp->fr = 1; resgrp->fr |= CLP_RSP_QPCIG_MASK_REFRESH;
} }
resgrp->dasm = cap->dasm; resgrp->dasm = cap->dasm;
resgrp->msia = cap->msi_addr; resgrp->msia = cap->msi_addr;

1
include/hw/s390x/s390-pci-clp.h
View File

@ -158,6 +158,7 @@ typedef struct ClpRspQueryPciGrp {
#define CLP_RSP_QPCIG_MASK_NOI 0xfff #define CLP_RSP_QPCIG_MASK_NOI 0xfff
uint16_t i; uint16_t i;
uint8_t version; uint8_t version;
#define CLP_RSP_QPCIG_MASK_RTR 0x20
#define CLP_RSP_QPCIG_MASK_FRAME 0x2 #define CLP_RSP_QPCIG_MASK_FRAME 0x2
#define CLP_RSP_QPCIG_MASK_REFRESH 0x1 #define CLP_RSP_QPCIG_MASK_REFRESH 0x1
uint8_t fr; uint8_t fr;