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amd_iommu: Check APIC ID > 255 for XTSup 

The XTSup mode enables x2APIC support for AMD IOMMU, which is needed
to support vcpu w/ APIC ID > 255.

Reviewed-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Santosh Shukla <santosh.shukla@amd.com>
Message-Id: <20240927172913.121477-6-santosh.shukla@amd.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Suravee Suthikulpanit 2024-09-27 12:29:13 -05:00 committed by Michael S. Tsirkin
parent f84aad4d71
commit b12cb3819b
1 changed files with 11 additions and 0 deletions
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11
hw/i386/amd_iommu.c
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@ -32,6 +32,7 @@
#include "trace.h"
#include "hw/i386/apic-msidef.h"
#include "hw/qdev-properties.h"
#include "kvm/kvm_i386.h"
/* used AMD-Vi MMIO registers */
const char *amdvi_mmio_low[] = {
@ -1651,6 +1652,16 @@ static void amdvi_sysbus_realize(DeviceState *dev, Error **errp)
memory_region_add_subregion_overlap(&s->mr_sys, AMDVI_INT_ADDR_FIRST,
&s->mr_ir, 1);
/* AMD IOMMU with x2APIC mode requires xtsup=on */
if (x86ms->apic_id_limit > 255 && !s->xtsup) {
error_report("AMD IOMMU with x2APIC confguration requires xtsup=on");
exit(EXIT_FAILURE);
}
if (s->xtsup && kvm_irqchip_is_split() && !kvm_enable_x2apic()) {
error_report("AMD IOMMU xtsup=on requires support on the KVM side");
exit(EXIT_FAILURE);
}
pci_setup_iommu(bus, &amdvi_iommu_ops, s);
amdvi_init(s);
}