intel_iommu: Add support for Extended Interrupt Mode

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>

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 2acec8555d0452ba71b4343e3bd42f94d65474e7..a605b5852e41ab87370cca2ff2a965f294746332 100644 (file)
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -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

diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 10c20fef209f842a03edea1667053ee2ffd64e2a..72b01149275570fab51fca570e0bbfc59ad26b57 100644 (file)
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -176,6 +176,7 @@
 
 /* IRTA_REG */
 #define VTD_IRTA_ADDR_MASK          (VTD_HAW_MASK ^ 0xfffULL)
+#define VTD_IRTA_EIME               (1ULL << 11)
 #define VTD_IRTA_SIZE_MASK          (0xfULL)
 
 /* ECAP_REG */
@@ -184,6 +185,7 @@
 #define VTD_ECAP_QI                 (1ULL << 1)
 /* Interrupt Remapping support */
 #define VTD_ECAP_IR                 (1ULL << 3)
+#define VTD_ECAP_EIM                (1ULL << 4)
 
 /* CAP_REG */
 /* (offset >> 4) << 24 */

diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index e048ced5d507e6a4edbc97454ff45d17e7cb1c21..745b4e76872993f2faf2b61becabe10343da0a61 100644 (file)
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -271,6 +271,7 @@ struct IntelIOMMUState {
     bool intr_enabled;              /* Whether guest enabled IR */
     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 */
 };
 
 /* Find the VTD Address space associated with the given bus pointer,