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intel_iommu: Add support for Extended Interrupt Mode

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As neither QEMU nor KVM support more than 255 CPUs so far, this is
simple: we only need to switch the destination ID translation in
vtd_remap_irq_get if EIME is set.

Once CFI support is there, it will have to take EIM into account as
well. So far, nothing to do for this.

This patch allows to use x2APIC in split irqchip mode of KVM.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
[use le32_to_cpu() to retrieve dest_id]
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:
Jan Kiszka 2016-07-14 13:56:28 +08:00 • committed by Michael S. Tsirkin
parent e3d9c92507
commit 28589311b3
3 changed files with 12 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

16
hw/i386/intel_iommu.c
View file

@ -916,6 +916,7 @@ static void vtd_interrupt_remap_table_setup(IntelIOMMUState *s)
value = vtd_get_quad_raw(s, DMAR_IRTA_REG);
s->intr_size = 1UL << ((value & VTD_IRTA_SIZE_MASK) + 1);
s->intr_root = value & VTD_IRTA_ADDR_MASK;
s->intr_eime = value & VTD_IRTA_EIME;
/* Notify global invalidation */
vtd_iec_notify_all(s, true, 0, 0);
@ -2058,11 +2059,13 @@ static int vtd_remap_irq_get(IntelIOMMUState *iommu, uint16_t index, VTDIrq *irq
irq->trigger_mode = irte.trigger_mode;
irq->vector = irte.vector;
irq->delivery_mode = irte.delivery_mode;
/* Not support EIM yet: please refer to vt-d 9.10 DST bits */
irq->dest = le32_to_cpu(irte.dest_id);
if (!iommu->intr_eime) {
#define VTD_IR_APIC_DEST_MASK (0xff00ULL)
#define VTD_IR_APIC_DEST_SHIFT (8)
irq->dest = (le32_to_cpu(irte.dest_id) & VTD_IR_APIC_DEST_MASK) >> \
VTD_IR_APIC_DEST_SHIFT;
irq->dest = (irq->dest & VTD_IR_APIC_DEST_MASK) >>
VTD_IR_APIC_DEST_SHIFT;
}
irq->dest_mode = irte.dest_mode;
irq->redir_hint = irte.redir_hint;
@ -2312,7 +2315,7 @@ static void vtd_init(IntelIOMMUState *s)
s->ecap = VTD_ECAP_QI | VTD_ECAP_IRO;
if (x86_iommu->intr_supported) {
s->ecap |= VTD_ECAP_IR;
s->ecap |= VTD_ECAP_IR | VTD_ECAP_EIM;
}
vtd_reset_context_cache(s);
@ -2366,10 +2369,9 @@ static void vtd_init(IntelIOMMUState *s)
vtd_define_quad(s, DMAR_FRCD_REG_0_2, 0, 0, 0x8000000000000000ULL);
/*
* Interrupt remapping registers, not support extended interrupt
* mode for now.
* Interrupt remapping registers.
*/
vtd_define_quad(s, DMAR_IRTA_REG, 0, 0xfffffffffffff00fULL, 0);
vtd_define_quad(s, DMAR_IRTA_REG, 0, 0xfffffffffffff80fULL, 0);
}
/* Should not reset address_spaces when reset because devices will still use