From 6c5e740247182807b684d30db20d9b8e169b5b22 Mon Sep 17 00:00:00 2001 From: Yi Min Zhao Date: Tue, 5 Sep 2017 12:13:00 +0200 Subject: s390x/pci: add iommu replay callback Let's introduce iommu replay callback for s390 pci iommu memory region. Currently we don't need any dma mapping replay. So let it return directly. This implementation will avoid meaningless loops calling translation callback. Reviewed-by: Pierre Morel Reviewed-by: Halil Pasic Signed-off-by: Yi Min Zhao Message-Id: <1504606380-49341-4-git-send-email-zyimin@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck --- hw/s390x/s390-pci-bus.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'hw/s390x/s390-pci-bus.c') diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c index bd8a3e1..3b9965f 100644 --- a/hw/s390x/s390-pci-bus.c +++ b/hw/s390x/s390-pci-bus.c @@ -397,6 +397,17 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr, return ret; } +static void s390_pci_iommu_replay(IOMMUMemoryRegion *iommu, + IOMMUNotifier *notifier) +{ + /* It's impossible to plug a pci device on s390x that already has iommu + * mappings which need to be replayed, that is due to the "one iommu per + * zpci device" construct. But when we support migration of vfio-pci + * devices in future, we need to revisit this. + */ + return; +} + static S390PCIIOMMU *s390_pci_get_iommu(S390pciState *s, PCIBus *bus, int devfn) { @@ -1045,6 +1056,7 @@ static void s390_iommu_memory_region_class_init(ObjectClass *klass, void *data) IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass); imrc->translate = s390_translate_iommu; + imrc->replay = s390_pci_iommu_replay; } static const TypeInfo s390_iommu_memory_region_info = { -- cgit v1.1