[Qemu-devel] [PATCH v3 23/26] q35: automatically load the q35 dsdt table

[Jason Baron <jbaron@redhat.com>]

From: Jason Baron <jbaron@redhat.com>

Automatically, locate the required q35 dsdt table on load. Otherwise we error
out. This could be done in the bios, but its harder to produce a good error
message.

Signed-off-by: Jason Baron <jbaron@redhat.com>
---
 hw/pc.c     |   19 +++++++++++++++++++
 hw/pc.h     |    2 ++
 hw/pc_q35.c |    7 +++++++
 3 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index dd79d14..ad8d502 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1149,3 +1149,22 @@ void ioapic_init_gsi(GSIState *gsi_state, const char *parent_name)
         gsi_state->ioapic_irq[i] = qdev_get_gpio_in(dev, i);
     }
 }
+
+int find_and_load_dsdt(const char *dsdt_name)
+{
+    char *filename;
+    char buf[1024];
+
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dsdt_name);
+    if (!filename) {
+        return -1;
+    }
+    snprintf(buf, sizeof(buf), "file=%s", filename);
+    g_free(filename);
+    if (acpi_table_add(buf) < 0) {
+        fprintf(stderr, "Wrong acpi table provided\n");
+        return -1;
+    }
+
+    return 0;
+}
diff --git a/hw/pc.h b/hw/pc.h
index ee98f59..72cc408 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -214,5 +214,7 @@ void pc_system_firmware_init(MemoryRegion *rom_memory);
 #define E820_UNUSABLE   5
 
 int e820_add_entry(uint64_t, uint64_t, uint32_t);
+int find_and_load_dsdt(const char *dsdt_name);
+
 
 #endif
diff --git a/hw/pc_q35.c b/hw/pc_q35.c
index 82ad4e8..ca30b65 100644
--- a/hw/pc_q35.c
+++ b/hw/pc_q35.c
@@ -223,6 +223,13 @@ static void pc_q35_init(ram_addr_t ram_size,
     qemu_irq *i8259;
     int i;
 
+    /* let's first see if we can find the proper dsdt */
+    if (find_and_load_dsdt("q35-acpi-dsdt.aml")) {
+        fprintf(stderr, "Couldn't find q35 dsdt table!\n"
+                        "Try updating your bios.\n");
+        exit(1);
+    }
+
     pc_cpus_init(cpu_model);
 
     kvmclock_create();
-- 
1.7.1