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x86-iommu: provide x86_iommu_get_default

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Instead of searching the device tree every time, one static variable is
declared for the default system x86 IOMMU device.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Peter Xu 2016-07-14 13:56:12 +08:00 committed by Michael S. Tsirkin
parent 04af0e18bc
commit 1cf5fd573f
3 changed files with 31 additions and 7 deletions
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9
hw/i386/acpi-build.c
View File

@ -52,7 +52,7 @@
#include "hw/i386/ich9.h"
#include "hw/pci/pci_bus.h"
#include "hw/pci-host/q35.h"
#include "hw/i386/intel_iommu.h"
#include "hw/i386/x86-iommu.h"
#include "hw/timer/hpet.h"
#include "hw/acpi/aml-build.h"
@ -2539,12 +2539,7 @@ static bool acpi_get_mcfg(AcpiMcfgInfo *mcfg)
static bool acpi_has_iommu(void)
{
bool ambiguous;
Object *intel_iommu;
intel_iommu = object_resolve_path_type("", TYPE_INTEL_IOMMU_DEVICE,
&ambiguous);
return intel_iommu && !ambiguous;
return !!x86_iommu_get_default();
}
static

23
hw/i386/x86-iommu.c
View File

@ -21,6 +21,28 @@
#include "hw/sysbus.h"
#include "hw/boards.h"
#include "hw/i386/x86-iommu.h"
#include "qemu/error-report.h"
/* Default X86 IOMMU device */
static X86IOMMUState *x86_iommu_default = NULL;
static void x86_iommu_set_default(X86IOMMUState *x86_iommu)
{
assert(x86_iommu);
if (x86_iommu_default) {
error_report("QEMU does not support multiple vIOMMUs "
"for x86 yet.");
exit(1);
}
x86_iommu_default = x86_iommu;
}
X86IOMMUState *x86_iommu_get_default(void)
{
return x86_iommu_default;
}
static void x86_iommu_realize(DeviceState *dev, Error **errp)
{
@ -28,6 +50,7 @@ static void x86_iommu_realize(DeviceState *dev, Error **errp)
if (x86_class->realize) {
x86_class->realize(dev, errp);
}
x86_iommu_set_default(X86_IOMMU_DEVICE(dev));
}
static void x86_iommu_class_init(ObjectClass *klass, void *data)

6
include/hw/i386/x86-iommu.h
View File

@ -45,4 +45,10 @@ struct X86IOMMUState {
SysBusDevice busdev;
};
/**
* x86_iommu_get_default - get default IOMMU device
* @return: pointer to default IOMMU device
*/
X86IOMMUState *x86_iommu_get_default(void);
#endif