qemu-kvm/kvm-amd_iommu-Use-shared-memory-region-for-Interrupt-Rem.patch

From 4859d41adfaae8933e074dcefdc81edd3832c914 Mon Sep 17 00:00:00 2001
From: John Allen <john.allen@amd.com>
Date: Wed, 11 Dec 2024 15:06:55 -0600
Subject: [PATCH 05/57] amd_iommu: Use shared memory region for Interrupt
 Remapping

RH-Author: John Allen <None>
RH-MergeRequest: 303: Interrupt Remap support for emulated amd viommu
RH-Jira: RHEL-66202
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [3/5] 48c0513c80257bfbd12c2cf3bab2503bd95d0b1c (johnalle/qemu-kvm-fork)

JIRA: https://issues.redhat.com/browse/RHEL-66202

commit 9fc9dbac61ddde7d8df37e84c8e02cec249d3222
Author: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Date:   Fri Sep 27 12:29:11 2024 -0500

    amd_iommu: Use shared memory region for Interrupt Remapping

    Use shared memory region for interrupt remapping which can be
    aliased by all devices.

    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: <20240927172913.121477-4-santosh.shukla@amd.com>
    Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
    Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Signed-off-by: John Allen <john.allen@amd.com>
---
 hw/i386/amd_iommu.c | 22 ++++++++++++++--------
 hw/i386/amd_iommu.h |  1 +
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 567cb8adc9..8fcf5eacb4 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -1443,7 +1443,7 @@ static AddressSpace *amdvi_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
          * |--------------------+-------------------+----------+
          * | amdvi-root         | 00000000-ffffffff |        0 |
          * |  amdvi-iommu_nodma  | 00000000-ffffffff |       0 |
-         * |  amdvi-iommu_ir     | fee00000-feefffff |      64 |
+         * |  amdvi-iommu_ir     | fee00000-feefffff |       1 |
          * |--------------------+-------------------+----------|
          */
         memory_region_init_iommu(&amdvi_dev_as->iommu,
@@ -1454,13 +1454,6 @@ static AddressSpace *amdvi_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
         memory_region_init(&amdvi_dev_as->root, OBJECT(s),
                            "amdvi_root", UINT64_MAX);
         address_space_init(&amdvi_dev_as->as, &amdvi_dev_as->root, name);
-        memory_region_init_io(&amdvi_dev_as->iommu_ir, OBJECT(s),
-                              &amdvi_ir_ops, s, "amd_iommu_ir",
-                              AMDVI_INT_ADDR_SIZE);
-        memory_region_add_subregion_overlap(&amdvi_dev_as->root,
-                                            AMDVI_INT_ADDR_FIRST,
-                                            &amdvi_dev_as->iommu_ir,
-                                            64);
         memory_region_add_subregion_overlap(&amdvi_dev_as->root, 0,
                                             MEMORY_REGION(&amdvi_dev_as->iommu),
                                             0);
@@ -1472,6 +1465,13 @@ static AddressSpace *amdvi_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
         memory_region_add_subregion_overlap(&amdvi_dev_as->root, 0,
                                             &amdvi_dev_as->iommu_nodma,
                                             0);
+        /* Build the Interrupt Remapping alias to shared memory */
+        memory_region_init_alias(&amdvi_dev_as->iommu_ir, OBJECT(s),
+                                 "amdvi-ir", &s->mr_ir, 0,
+                                 memory_region_size(&s->mr_ir));
+        memory_region_add_subregion_overlap(MEMORY_REGION(&amdvi_dev_as->iommu),
+                                            AMDVI_INT_ADDR_FIRST,
+                                            &amdvi_dev_as->iommu_ir, 1);
 
         if (!x86_iommu->pt_supported) {
             memory_region_set_enabled(&amdvi_dev_as->iommu_nodma, false);
@@ -1633,6 +1633,12 @@ static void amdvi_sysbus_realize(DeviceState *dev, Error **errp)
     memory_region_add_subregion_overlap(&s->mr_sys, 0,
                                         &s->mr_nodma, 0);
 
+    /* set up the Interrupt Remapping memory region */
+    memory_region_init_io(&s->mr_ir, OBJECT(s), &amdvi_ir_ops,
+                          s, "amdvi-ir", AMDVI_INT_ADDR_SIZE);
+    memory_region_add_subregion_overlap(&s->mr_sys, AMDVI_INT_ADDR_FIRST,
+                                        &s->mr_ir, 1);
+
     pci_setup_iommu(bus, &amdvi_iommu_ops, s);
     amdvi_init(s);
 }
diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
index be417e51c4..e0dac4d9a9 100644
--- a/hw/i386/amd_iommu.h
+++ b/hw/i386/amd_iommu.h
@@ -356,6 +356,7 @@ struct AMDVIState {
     MemoryRegion mr_mmio;              /* MMIO region                  */
     MemoryRegion mr_sys;
     MemoryRegion mr_nodma;
+    MemoryRegion mr_ir;
     uint8_t mmior[AMDVI_MMIO_SIZE];    /* read/write MMIO              */
     uint8_t w1cmask[AMDVI_MMIO_SIZE];  /* read/write 1 clear mask      */
     uint8_t romask[AMDVI_MMIO_SIZE];   /* MMIO read/only mask          */
-- 
2.39.3