[PATCH v4 26/28] tools/libxl: build DMAR table for a guest with one virtual VTD

[Chao Gao <chao.gao@intel.com>]

A new logic is added to init_acpi_config(). The logic initializes
some fields introduced for DMAR table. For PVH guest, the DMAR table
is built as other tables. But for HVM guest, only the DMAR table is
built in toolstack and pass through it to guest via existing mechanism.

Signed-off-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
---
v4:
 - build DMAR table for PVH guest.
 - remove LIBXL_DEVICE_MODEL_VERSION_NONE

v3:
 - build dmar and initialize related acpi_modules struct in
 libxl_x86_acpi.c, keeping in accordance with pvh.
---
 tools/libacpi/build.c        | 12 ++++++
 tools/libacpi/libacpi.h      |  1 +
 tools/libxl/libxl_x86.c      |  4 +-
 tools/libxl/libxl_x86_acpi.c | 98 ++++++++++++++++++++++++++++++++++++++++++--
 4 files changed, 111 insertions(+), 4 deletions(-)

diff --git a/tools/libacpi/build.c b/tools/libacpi/build.c
index bd759da..df0a67c 100644
--- a/tools/libacpi/build.c
+++ b/tools/libacpi/build.c
@@ -517,6 +517,18 @@ static int construct_secondary_tables(struct acpi_ctxt *ctxt,
             printf("Failed to build SLIT, skipping...\n");
     }
 
+    /* DMAR */
+    if ( config->table_flags & ACPI_HAS_DMAR )
+    {
+        struct acpi_dmar *dmar = construct_dmar(ctxt, config);
+
+        if ( dmar )
+            table_ptrs[nr_tables++] = ctxt->mem_ops.v2p(ctxt, dmar);
+        else
+            printf("Failed to build DMAR, skipping...\n");
+    }
+
+
     /* Load any additional tables passed through. */
     nr_tables += construct_passthrough_tables(ctxt, table_ptrs,
                                               nr_tables, config);
diff --git a/tools/libacpi/libacpi.h b/tools/libacpi/libacpi.h
index c09afdc..bdeeccc 100644
--- a/tools/libacpi/libacpi.h
+++ b/tools/libacpi/libacpi.h
@@ -36,6 +36,7 @@
 #define ACPI_HAS_8042              (1<<13)
 #define ACPI_HAS_CMOS_RTC          (1<<14)
 #define ACPI_HAS_SSDT_LAPTOP_SLATE (1<<15)
+#define ACPI_HAS_DMAR              (1<<16)
 
 struct xen_vmemrange;
 struct acpi_numa {
diff --git a/tools/libxl/libxl_x86.c b/tools/libxl/libxl_x86.c
index 5f91fe4..cb2f494 100644
--- a/tools/libxl/libxl_x86.c
+++ b/tools/libxl/libxl_x86.c
@@ -383,7 +383,9 @@ int libxl__arch_domain_finalise_hw_description(libxl__gc *gc,
 {
     int rc = 0;
 
-    if (info->type == LIBXL_DOMAIN_TYPE_PVH) {
+
+    if (info->type == LIBXL_DOMAIN_TYPE_HVM
+            || info->type == LIBXL_DOMAIN_TYPE_PVH) {
         rc = libxl__dom_load_acpi(gc, info, dom);
         if (rc != 0)
             LOGE(ERROR, "libxl_dom_load_acpi failed");
diff --git a/tools/libxl/libxl_x86_acpi.c b/tools/libxl/libxl_x86_acpi.c
index 9a7c904..bbe9219 100644
--- a/tools/libxl/libxl_x86_acpi.c
+++ b/tools/libxl/libxl_x86_acpi.c
@@ -16,6 +16,7 @@
 #include "libxl_arch.h"
 #include <xen/hvm/hvm_info_table.h>
 #include <xen/hvm/e820.h>
+#include "libacpi/acpi2_0.h"
 #include "libacpi/libacpi.h"
 
 #include <xc_dom.h>
@@ -100,6 +101,25 @@ static int init_acpi_config(libxl__gc *gc,
     struct hvm_info_table *hvminfo;
     int i, r, rc;
 
+    if ((b_info->num_viommus == 1) &&
+        (b_info->viommu[0].type == LIBXL_VIOMMU_TYPE_INTEL_VTD)) {
+        if (libxl_defbool_val(b_info->viommu[0].intremap))
+            config->iommu_intremap_supported = true;
+        config->iommu_base_addr = b_info->viommu[0].base_addr;
+
+        /* IOAPIC id and PSEUDO BDF */
+        config->ioapic_id = 1;
+        config->ioapic_bus = 0xff;
+        config->ioapic_devfn = 0x0;
+
+        config->host_addr_width = 39;
+        config->table_flags |= ACPI_HAS_DMAR;
+    }
+
+    if (b_info->type == LIBXL_DOMAIN_TYPE_HVM) {
+        return 0;
+    }
+
     config->dsdt_anycpu = config->dsdt_15cpu = dsdt_pvh;
     config->dsdt_anycpu_len = config->dsdt_15cpu_len = dsdt_pvh_len;
 
@@ -161,9 +181,9 @@ out:
     return rc;
 }
 
-int libxl__dom_load_acpi(libxl__gc *gc,
-                         const libxl_domain_build_info *b_info,
-                         struct xc_dom_image *dom)
+static int libxl__dom_load_acpi_pvh(libxl__gc *gc,
+                                    const libxl_domain_build_info *b_info,
+                                    struct xc_dom_image *dom)
 {
     struct acpi_config config = {0};
     struct libxl_acpi_ctxt libxl_ctxt;
@@ -235,6 +255,78 @@ out:
     return rc;
 }
 
+static void *acpi_memalign(struct acpi_ctxt *ctxt, uint32_t size,
+                           uint32_t align)
+{
+    int ret;
+    void *ptr;
+
+    ret = posix_memalign(&ptr, align, size);
+    if (ret != 0 || !ptr)
+        return NULL;
+
+    return ptr;
+}
+
+/*
+ * For hvm, we don't need build acpi in libxl. Instead, it's built in hvmloader.
+ * But if one hvm has virtual VTD(s), we build DMAR table for it and joint this
+ * table with existing content in acpi_modules in order to employ HVM
+ * firmware pass-through mechanism to pass-through DMAR table.
+ */
+static int libxl__dom_load_acpi_hvm(libxl__gc *gc,
+                                    const libxl_domain_build_info *b_info,
+                                    struct xc_dom_image *dom)
+{
+    struct acpi_config config = { 0 };
+    struct acpi_ctxt ctxt;
+    struct acpi_dmar *dmar;
+    uint32_t len;
+
+    ctxt.mem_ops.alloc = acpi_memalign;
+    ctxt.mem_ops.v2p = virt_to_phys;
+    ctxt.mem_ops.free = acpi_mem_free;
+
+    init_acpi_config(gc, dom, b_info, &config);
+    dmar = construct_dmar(&ctxt, &config);
+    if ( !dmar )
+        return ERROR_NOMEM;
+    len = dmar->header.length;
+
+    if (len) {
+        libxl__ptr_add(gc, dmar);
+        if (!dom->acpi_modules[0].data) {
+            dom->acpi_modules[0].data = (void *)dmar;
+            dom->acpi_modules[0].length = len;
+        } else {
+            /* joint tables */
+            void *newdata;
+
+            newdata = libxl__malloc(gc, len + dom->acpi_modules[0].length);
+            memcpy(newdata, dom->acpi_modules[0].data,
+                   dom->acpi_modules[0].length);
+            memcpy(newdata + dom->acpi_modules[0].length, dmar, len);
+
+            free(dom->acpi_modules[0].data);
+            dom->acpi_modules[0].data = newdata;
+            dom->acpi_modules[0].length += len;
+        }
+    }
+    return 0;
+}
+
+int libxl__dom_load_acpi(libxl__gc *gc,
+                         const libxl_domain_build_info *b_info,
+                         struct xc_dom_image *dom)
+{
+
+    if (b_info->type == LIBXL_DOMAIN_TYPE_PVH)
+        return libxl__dom_load_acpi_pvh(gc, b_info, dom);
+    else if (b_info->type == LIBXL_DOMAIN_TYPE_HVM)
+        return libxl__dom_load_acpi_hvm(gc, b_info, dom);
+
+    return -EINVAL;
+}
 /*
  * Local variables:
  * mode: C
-- 
1.8.3.1


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