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From: Wang Xingang <wangxingang5@huawei.com>
To: <qemu-devel@nongnu.org>, <qemu-arm@nongnu.org>,
	<eric.auger@redhat.com>, <shannon.zhaosl@gmail.com>,
	<imammedo@redhat.com>, <mst@redhat.com>,
	<marcel.apfelbaum@gmail.com>, <peter.maydell@linaro.org>,
	<ehabkost@redhat.com>, <richard.henderson@linaro.org>,
	<pbonzini@redhat.com>
Cc: xieyingtai@huawei.com, cenjiahui@huawei.com, wangxingang5@huawei.com
Subject: [PATCH RFC v3 7/8] hw/i386/acpi-build: Add explicit scope in DMAR table
Date: Wed, 21 Apr 2021 08:05:02 +0000
Message-ID: <1618992303-19556-8-git-send-email-wangxingang5@huawei.com> (raw)
In-Reply-To: <1618992303-19556-1-git-send-email-wangxingang5@huawei.com>

From: Xingang Wang <wangxingang5@huawei.com>

In DMAR table, the drhd is set to cover all pci devices when intel_iommu
is on. This patch add explicit scope data, including only the pci devices
that go through iommu.

Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
---
 hw/i386/acpi-build.c | 68 ++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 66 insertions(+), 2 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index de98750aef..fdb26682cb 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1988,6 +1988,56 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
                  x86ms->oem_table_id);
 }
 
+/*
+ * Insert DMAR scope for PCI bridges and endpoint devcie
+ */
+static void
+insert_scope(PCIBus *bus, PCIDevice *dev, void *opaque)
+{
+    GArray *scope_blob = opaque;
+    AcpiDmarDeviceScope *scope = NULL;
+
+    if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) {
+        /* Dmar Scope Type: 0x02 for PCI Bridge */
+        build_append_int_noprefix(scope_blob, 0x02, 1);
+    } else {
+        /* Dmar Scope Type: 0x01 for PCI Endpoint Device */
+        build_append_int_noprefix(scope_blob, 0x01, 1);
+    }
+
+    /* length */
+    build_append_int_noprefix(scope_blob,
+                              sizeof(*scope) + sizeof(scope->path[0]), 1);
+    /* reserved */
+    build_append_int_noprefix(scope_blob, 0, 2);
+    /* enumeration_id */
+    build_append_int_noprefix(scope_blob, 0, 1);
+    /* bus */
+    build_append_int_noprefix(scope_blob, pci_bus_num(bus), 1);
+    /* device */
+    build_append_int_noprefix(scope_blob, PCI_SLOT(dev->devfn), 1);
+    /* function */
+    build_append_int_noprefix(scope_blob, PCI_FUNC(dev->devfn), 1);
+}
+
+/* For a given PCI host bridge, walk and insert DMAR scope */
+static int
+dmar_host_bridges(Object *obj, void *opaque)
+{
+    GArray *scope_blob = opaque;
+
+    if (object_dynamic_cast(obj, TYPE_PCI_HOST_BRIDGE)) {
+        PCIBus *bus = PCI_HOST_BRIDGE(obj)->bus;
+
+        if (bus && !pci_bus_bypass_iommu(bus)) {
+            pci_for_each_device(bus, pci_bus_num(bus), insert_scope,
+                                scope_blob);
+        }
+    }
+
+    return 0;
+}
+
 /*
  * VT-d spec 8.1 DMA Remapping Reporting Structure
  * (version Oct. 2014 or later)
@@ -2007,6 +2057,15 @@ build_dmar_q35(GArray *table_data, BIOSLinker *linker, const char *oem_id,
     /* Root complex IOAPIC use one path[0] only */
     size_t ioapic_scope_size = sizeof(*scope) + sizeof(scope->path[0]);
     IntelIOMMUState *intel_iommu = INTEL_IOMMU_DEVICE(iommu);
+    GArray *scope_blob = g_array_new(false, true, 1);
+
+    /*
+     * A PCI bus walk, for each PCI host bridge.
+     * Insert scope for each PCI bridge and endpoint device which
+     * is attached to a bus with iommu enabled.
+     */
+    object_child_foreach_recursive(object_get_root(),
+                                   dmar_host_bridges, scope_blob);
 
     assert(iommu);
     if (x86_iommu_ir_supported(iommu)) {
@@ -2020,8 +2079,9 @@ build_dmar_q35(GArray *table_data, BIOSLinker *linker, const char *oem_id,
     /* DMAR Remapping Hardware Unit Definition structure */
     drhd = acpi_data_push(table_data, sizeof(*drhd) + ioapic_scope_size);
     drhd->type = cpu_to_le16(ACPI_DMAR_TYPE_HARDWARE_UNIT);
-    drhd->length = cpu_to_le16(sizeof(*drhd) + ioapic_scope_size);
-    drhd->flags = ACPI_DMAR_INCLUDE_PCI_ALL;
+    drhd->length =
+        cpu_to_le16(sizeof(*drhd) + ioapic_scope_size + scope_blob->len);
+    drhd->flags = 0;            /* Don't include all pci device */
     drhd->pci_segment = cpu_to_le16(0);
     drhd->address = cpu_to_le64(Q35_HOST_BRIDGE_IOMMU_ADDR);
 
@@ -2035,6 +2095,10 @@ build_dmar_q35(GArray *table_data, BIOSLinker *linker, const char *oem_id,
     scope->path[0].device = PCI_SLOT(Q35_PSEUDO_DEVFN_IOAPIC);
     scope->path[0].function = PCI_FUNC(Q35_PSEUDO_DEVFN_IOAPIC);
 
+    /* Add scope found above */
+    g_array_append_vals(table_data, scope_blob->data, scope_blob->len);
+    g_array_free(scope_blob, true);
+
     if (iommu->dt_supported) {
         atsr = acpi_data_push(table_data, sizeof(*atsr));
         atsr->type = cpu_to_le16(ACPI_DMAR_TYPE_ATSR);
-- 
2.19.1



  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21  8:04 [PATCH RFC v3 0/8] Introduce Bypass IOMMU Feature Wang Xingang
2021-04-21  8:04 ` [PATCH RFC v3 1/8] hw/pci/pci_host: Allow bypass iommu for pci host Wang Xingang
2021-04-21  8:04 ` [PATCH RFC v3 2/8] hw/pxb: Add a bypass iommu property Wang Xingang
2021-04-21  8:04 ` [PATCH RFC v3 3/8] hw/arm/virt: Add a machine option to bypass iommu for primary bus Wang Xingang
2021-04-21  8:04 ` [PATCH RFC v3 4/8] hw/i386: Add a pc " Wang Xingang
2021-04-21  8:05 ` [PATCH RFC v3 5/8] hw/pci: Add pci_bus_range to get bus number range Wang Xingang
2021-04-21  8:05 ` [PATCH RFC v3 6/8] hw/arm/virt-acpi-build: Add explicit IORT idmap for smmuv3 node Wang Xingang
2021-04-21  8:05 ` Wang Xingang [this message]
2021-04-21  8:05 ` [PATCH RFC v3 8/8] hw/i386/acpi-build: Add bypass_iommu check when building IVRS table Wang Xingang

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