iommu: Don't crash if machine is not PC_MACHINE
Currently it's possible to crash QEMU using "-device *-iommu" and "-machine none": $ qemu-system-x86_64 -machine none -device amd-iommu qemu/hw/i386/amd_iommu.c:1140:amdvi_realize: Object 0x55627dafbc90 is not an instance of type generic-pc-machine Aborted (core dumped) $ qemu-system-x86_64 -machine none -device intel-iommu qemu/hw/i386/intel_iommu.c:2972:vtd_realize: Object 0x56292ec0bc90 is not an instance of type generic-pc-machine Aborted (core dumped) Fix amd-iommu and intel-iommu to ensure the current machine is really a TYPE_PC_MACHINE instance at their realize methods. Resulting error messages: $ qemu-system-x86_64 -machine none -device amd-iommu qemu-system-x86_64: -device amd-iommu: Machine-type 'none' not supported by amd-iommu $ qemu-system-x86_64 -machine none -device intel-iommu qemu-system-x86_64: -device intel-iommu: Machine-type 'none' not supported by intel-iommu Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -21,6 +21,7 @@
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*/
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*/
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#include "qemu/osdep.h"
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#include "qemu/osdep.h"
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#include "hw/i386/amd_iommu.h"
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#include "hw/i386/amd_iommu.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/error-report.h"
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#include "trace.h"
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#include "trace.h"
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@ -1137,7 +1138,19 @@ static void amdvi_realize(DeviceState *dev, Error **err)
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int ret = 0;
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int ret = 0;
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AMDVIState *s = AMD_IOMMU_DEVICE(dev);
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AMDVIState *s = AMD_IOMMU_DEVICE(dev);
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X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
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X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
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PCIBus *bus = PC_MACHINE(qdev_get_machine())->bus;
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MachineState *ms = MACHINE(qdev_get_machine());
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MachineClass *mc = MACHINE_GET_CLASS(ms);
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PCMachineState *pcms =
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PC_MACHINE(object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE));
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PCIBus *bus;
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if (!pcms) {
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error_setg(err, "Machine-type '%s' not supported by amd-iommu",
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mc->name);
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return;
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}
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bus = pcms->bus;
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s->iotlb = g_hash_table_new_full(amdvi_uint64_hash,
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s->iotlb = g_hash_table_new_full(amdvi_uint64_hash,
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amdvi_uint64_equal, g_free, g_free);
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amdvi_uint64_equal, g_free, g_free);
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@ -2969,11 +2969,21 @@ static bool vtd_decide_config(IntelIOMMUState *s, Error **errp)
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static void vtd_realize(DeviceState *dev, Error **errp)
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static void vtd_realize(DeviceState *dev, Error **errp)
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{
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{
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PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
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MachineState *ms = MACHINE(qdev_get_machine());
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PCIBus *bus = pcms->bus;
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MachineClass *mc = MACHINE_GET_CLASS(ms);
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PCMachineState *pcms =
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PC_MACHINE(object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE));
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PCIBus *bus;
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IntelIOMMUState *s = INTEL_IOMMU_DEVICE(dev);
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IntelIOMMUState *s = INTEL_IOMMU_DEVICE(dev);
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X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
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X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
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if (!pcms) {
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error_setg(errp, "Machine-type '%s' not supported by intel-iommu",
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mc->name);
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return;
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}
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bus = pcms->bus;
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VTD_DPRINTF(GENERAL, "");
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VTD_DPRINTF(GENERAL, "");
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x86_iommu->type = TYPE_INTEL;
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x86_iommu->type = TYPE_INTEL;
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