37fa32de70
When an s390 guest is using lazy unmapping, it can result in a very large number of oustanding DMA requests, far beyond the default limit configured for vfio. Let's track DMA usage similar to vfio in the host, and trigger the guest to flush their DMA mappings before vfio runs out. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> [aw: non-Linux build fixes] Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
37 lines
1.0 KiB
C
37 lines
1.0 KiB
C
/*
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* s390 vfio-pci interfaces
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*
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* Copyright 2020 IBM Corp.
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* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef HW_S390_PCI_VFIO_H
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#define HW_S390_PCI_VFIO_H
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#include "hw/s390x/s390-pci-bus.h"
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#ifdef CONFIG_LINUX
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bool s390_pci_update_dma_avail(int fd, unsigned int *avail);
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S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s,
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S390PCIBusDevice *pbdev);
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void s390_pci_end_dma_count(S390pciState *s, S390PCIDMACount *cnt);
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#else
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static inline bool s390_pci_update_dma_avail(int fd, unsigned int *avail)
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{
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return false;
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}
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static inline S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s,
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S390PCIBusDevice *pbdev)
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{
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return NULL;
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}
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static inline void s390_pci_end_dma_count(S390pciState *s,
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S390PCIDMACount *cnt) { }
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#endif
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#endif
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