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intel_iommu: add OnOffAuto intr_eim as "eim" property 

The default (auto) emulates the current behavior.
A user can now control EIM like
  -device intel-iommu,intremap=on,eim=off

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Radim Krčmář 2016-10-10 17:28:46 +02:00 committed by Eduardo Habkost
parent 6333e93c77
commit e6b6af0560
2 changed files with 22 additions and 3 deletions
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24
hw/i386/intel_iommu.c
View File

@ -2013,6 +2013,8 @@ static const MemoryRegionOps vtd_mem_ops = {
static Property vtd_properties[] = {
DEFINE_PROP_UINT32("version", IntelIOMMUState, version, 0),
DEFINE_PROP_ON_OFF_AUTO("eim", IntelIOMMUState, intr_eim,
ON_OFF_AUTO_AUTO),
DEFINE_PROP_END_OF_LIST(),
};
@ -2380,7 +2382,11 @@ static void vtd_init(IntelIOMMUState *s)
s->ecap = VTD_ECAP_QI | VTD_ECAP_IRO;
if (x86_iommu->intr_supported) {
s->ecap |= VTD_ECAP_IR | VTD_ECAP_EIM | VTD_ECAP_MHMV;
s->ecap |= VTD_ECAP_IR | VTD_ECAP_MHMV;
if (s->intr_eim == ON_OFF_AUTO_ON) {
s->ecap |= VTD_ECAP_EIM;
}
assert(s->intr_eim != ON_OFF_AUTO_AUTO);
}
vtd_reset_context_cache(s);
@ -2461,8 +2467,10 @@ static AddressSpace *vtd_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
return &vtd_as->as;
}
static bool vtd_check_config(X86IOMMUState *x86_iommu, Error **errp)
static bool vtd_decide_config(IntelIOMMUState *s, Error **errp)
{
X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s);
/* Currently Intel IOMMU IR only support "kernel-irqchip={off|split}" */
if (x86_iommu->intr_supported && kvm_irqchip_in_kernel() &&
!kvm_irqchip_is_split()) {
@ -2470,6 +2478,16 @@ static bool vtd_check_config(X86IOMMUState *x86_iommu, Error **errp)
"kernel-irqchip=on, please use 'split|off'.");
return false;
}
if (s->intr_eim == ON_OFF_AUTO_ON && !x86_iommu->intr_supported) {
error_setg(errp, "eim=on cannot be selected without intremap=on");
return false;
}
if (s->intr_eim == ON_OFF_AUTO_AUTO) {
s->intr_eim = x86_iommu->intr_supported ?
ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
}
return true;
}
@ -2483,7 +2501,7 @@ static void vtd_realize(DeviceState *dev, Error **errp)
VTD_DPRINTF(GENERAL, "");
x86_iommu->type = TYPE_INTEL;
if (!vtd_check_config(x86_iommu, errp)) {
if (!vtd_decide_config(s, errp)) {
return;
}

1
include/hw/i386/intel_iommu.h
View File

@ -289,6 +289,7 @@ struct IntelIOMMUState {
dma_addr_t intr_root; /* Interrupt remapping table pointer */
uint32_t intr_size; /* Number of IR table entries */
bool intr_eime; /* Extended interrupt mode enabled */
OnOffAuto intr_eim; /* Toggle for EIM cabability */
};
/* Find the VTD Address space associated with the given bus pointer,