Re: [Qemu-devel] [PATCH] qtest/bios-tables: Add DMAR unit test on intel_iommu for q35

[Marcel Apfelbaum <marcel.a@redhat.com>]

On Sat, 2014-11-22 at 20:05 +0100, Vasilis Liaskovitis wrote:
> The test enables intel_iommu on q35 and reads the DMAR table and its only
> DRHC structure (for now), checking only the header and checksums.
> 
> Signed-off-by: Vasilis Liaskovitis <vliaskov@gmail.com>
> ---
>  tests/bios-tables-test.c | 34 +++++++++++++++++++++++++++++++++-
>  1 file changed, 33 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/bios-tables-test.c b/tests/bios-tables-test.c
> index 9e4d205..f09b0cb 100644
> --- a/tests/bios-tables-test.c
> +++ b/tests/bios-tables-test.c
> @@ -45,6 +45,8 @@ typedef struct {
>      AcpiRsdtDescriptorRev1 rsdt_table;
>      AcpiFadtDescriptorRev1 fadt_table;
>      AcpiFacsDescriptorRev1 facs_table;
> +    AcpiTableDmar dmar_table;
> +    AcpiDmarHardwareUnit drhd;
>      uint32_t *rsdt_tables_addr;
>      int rsdt_tables_nr;
>      GArray *tables;
> @@ -371,6 +373,33 @@ static void test_acpi_dsdt_table(test_data *data)
>      g_array_append_val(data->tables, dsdt_table);
>  }
>  
> +static void test_acpi_dmar_table(test_data *data)
> +{
> +    AcpiTableDmar *dmar_table = &data->dmar_table;
> +    AcpiDmarHardwareUnit *drhd = &data->drhd;
> +    struct AcpiTableHeader *header = (struct AcpiTableHeader *) dmar_table;
> +    int tables_nr = data->rsdt_tables_nr - 1;
> +    uint32_t addr = data->rsdt_tables_addr[tables_nr]; /* dmar is last */
Hi,

The DMAR table is always last? If not, it will break when we add another table test.
I suggest going over the tables and looking for the DMAR signature.

Thanks,
Marcel

> +
> +    memset(dmar_table, 0, sizeof(*dmar_table));
> +    ACPI_READ_TABLE_HEADER(dmar_table, addr);
> +    ACPI_ASSERT_CMP(header->signature, "DMAR");
> +
> +    ACPI_READ_FIELD(dmar_table->host_address_width, addr);
> +    ACPI_READ_FIELD(dmar_table->flags, addr);
> +    ACPI_READ_ARRAY_PTR(dmar_table->reserved, 10, addr);
> +
> +    memset(drhd, 0, sizeof(*drhd));
> +    ACPI_READ_FIELD(drhd->type, addr);
> +    ACPI_READ_FIELD(drhd->length, addr);
> +    ACPI_READ_FIELD(drhd->flags, addr);
> +    ACPI_READ_FIELD(drhd->pci_segment, addr);
> +    ACPI_READ_FIELD(drhd->address, addr);
> +    g_assert(!acpi_checksum((uint8_t *)dmar_table, sizeof(AcpiTableDmar) +
> +        drhd->length));
> +
> +}
> +
>  static void test_acpi_tables(test_data *data)
>  {
>      int tables_nr = data->rsdt_tables_nr - 1; /* fadt is first */
> @@ -747,6 +776,9 @@ static void test_acpi_one(const char *params, test_data *data)
>      test_acpi_fadt_table(data);
>      test_acpi_facs_table(data);
>      test_acpi_dsdt_table(data);
> +    if (strstr(params, "iommu=on")) {
> +        test_acpi_dmar_table(data);
> +    }
>      test_acpi_tables(data);
>  
>      if (iasl) {
> @@ -779,7 +811,7 @@ static void test_acpi_tcg(void)
>  
>      memset(&data, 0, sizeof(data));
>      data.machine = MACHINE_Q35;
> -    test_acpi_one("-machine q35,accel=tcg", &data);
> +    test_acpi_one("-machine q35,accel=tcg,iommu=on", &data);
>      free_test_data(&data);
>  }
>