Re: [PATCH 2/5] bios-tables-test: teach test to use smbios 3.0 tables

[Julia Suvorova]

On Mon, May 30, 2022 at 8:11 AM Ani Sinha <ani@anisinha.ca> wrote:
>
> On Fri, May 27, 2022 at 10:27 PM Julia Suvorova <jusual@redhat.com> wrote:
> >
> > Introduce the 64-bit entry point. Since we no longer have a total
> > number of structures, stop checking for the new ones at the EOF
> > structure (type 127).
> >
> > Signed-off-by: Julia Suvorova <jusual@redhat.com>
> > ---
> >  tests/qtest/bios-tables-test.c | 101 ++++++++++++++++++++++++---------
> >  1 file changed, 75 insertions(+), 26 deletions(-)
> >
> > diff --git a/tests/qtest/bios-tables-test.c b/tests/qtest/bios-tables-test.c
> > index a4a46e97f0..0ba9d749a5 100644
> > --- a/tests/qtest/bios-tables-test.c
> > +++ b/tests/qtest/bios-tables-test.c
> > @@ -75,6 +75,14 @@
> >  #define OEM_TEST_ARGS      "-machine x-oem-id=" OEM_ID ",x-oem-table-id=" \
> >                             OEM_TABLE_ID
> >
> > +#define SMBIOS_VER21 0
> > +#define SMBIOS_VER30 1
> > +
> > +typedef struct {
> > +    struct smbios_21_entry_point ep21;
> > +    struct smbios_30_entry_point ep30;
> > +} smbios_entry_point;
> > +
> >  typedef struct {
> >      bool tcg_only;
> >      const char *machine;
> > @@ -88,8 +96,8 @@ typedef struct {
> >      uint64_t rsdp_addr;
> >      uint8_t rsdp_table[36 /* ACPI 2.0+ RSDP size */];
> >      GArray *tables;
> > -    uint32_t smbios_ep_addr;
> > -    struct smbios_21_entry_point smbios_ep_table;
> > +    uint64_t smbios_ep_addr[2];
> > +    smbios_entry_point smbios_ep_table;
> >      uint16_t smbios_cpu_max_speed;
> >      uint16_t smbios_cpu_curr_speed;
> >      uint8_t *required_struct_types;
> > @@ -533,10 +541,10 @@ static void test_acpi_asl(test_data *data)
> >      free_test_data(&exp_data);
> >  }
> >
> > -static bool smbios_ep_table_ok(test_data *data)
> > +static bool smbios_ep2_table_ok(test_data *data)
> >  {
> > -    struct smbios_21_entry_point *ep_table = &data->smbios_ep_table;
> > -    uint32_t addr = data->smbios_ep_addr;
> > +    struct smbios_21_entry_point *ep_table = &data->smbios_ep_table.ep21;
> > +    uint32_t addr = data->smbios_ep_addr[SMBIOS_VER21];
> >
> >      qtest_memread(data->qts, addr, ep_table, sizeof(*ep_table));
> >      if (memcmp(ep_table->anchor_string, "_SM_", 4)) {
> > @@ -559,29 +567,59 @@ static bool smbios_ep_table_ok(test_data *data)
> >      return true;
> >  }
> >
> > -static void test_smbios_entry_point(test_data *data)
> > +static bool smbios_ep3_table_ok(test_data *data)
> > +{
> > +    struct smbios_30_entry_point *ep_table = &data->smbios_ep_table.ep30;
> > +    uint64_t addr = data->smbios_ep_addr[SMBIOS_VER30];
> > +
> > +    qtest_memread(data->qts, addr, ep_table, sizeof(*ep_table));
> > +    if (memcmp(ep_table->anchor_string, "_SM3_", 5)) {
> > +        return false;
> > +    }
> > +
> > +    if (acpi_calc_checksum((uint8_t *)ep_table, sizeof *ep_table)) {
> > +        return false;
> > +    }
> > +
> > +    return true;
> > +}
> > +
> > +static int test_smbios_entry_point(test_data *data)
> >  {
> >      uint32_t off;
> > +    bool found_ep2 = false, found_ep3 = false;
> >
> >      /* find smbios entry point structure */
> >      for (off = 0xf0000; off < 0x100000; off += 0x10) {
> > -        uint8_t sig[] = "_SM_";
> > +        uint8_t sig[] = "_SM3_";
> >          int i;
> >
> >          for (i = 0; i < sizeof sig - 1; ++i) {
> >              sig[i] = qtest_readb(data->qts, off + i);
> >          }
> >
> > -        if (!memcmp(sig, "_SM_", sizeof sig)) {
> > +        if (!found_ep2 && !memcmp(sig, "_SM_", sizeof sig - 2)) {
> >              /* signature match, but is this a valid entry point? */
> > -            data->smbios_ep_addr = off;
> > -            if (smbios_ep_table_ok(data)) {
> > -                break;
> > +            data->smbios_ep_addr[SMBIOS_VER21] = off;
> > +            if (smbios_ep2_table_ok(data)) {
> > +                found_ep2 = true;
> > +            }
> > +        } else if (!found_ep3 && !memcmp(sig, "_SM3_", sizeof sig - 1)) {
> > +            data->smbios_ep_addr[SMBIOS_VER30] = off;
> > +            if (smbios_ep3_table_ok(data)) {
> > +                found_ep3 = true;
> >              }
> >          }
> > +
> > +        if (found_ep2 || found_ep3) {
> > +            break;
> > +        }
> >      }
> >
> > -    g_assert_cmphex(off, <, 0x100000);
> > +    g_assert_cmphex(data->smbios_ep_addr[SMBIOS_VER21], <, 0x100000);
> > +    g_assert_cmphex(data->smbios_ep_addr[SMBIOS_VER30], <, 0x100000);
> > +
> > +    return found_ep3 ? SMBIOS_VER30 : SMBIOS_VER21;
> >  }
> >
> >  static inline bool smbios_single_instance(uint8_t type)
> > @@ -625,16 +663,23 @@ static bool smbios_cpu_test(test_data *data, uint32_t 
> > addr)
> >      return true;
> >  }
> >
> > -static void test_smbios_structs(test_data *data)
> > +static void test_smbios_structs(test_data *data, int ver)
> >  {
> >      DECLARE_BITMAP(struct_bitmap, SMBIOS_MAX_TYPE+1) = { 0 };
> > -    struct smbios_21_entry_point *ep_table = &data->smbios_ep_table;
> > -    uint32_t addr = le32_to_cpu(ep_table->structure_table_address);
> > -    int i, len, max_len = 0;
> > +
> > +    smbios_entry_point *ep_table = &data->smbios_ep_table;
> > +    int i = 0, len, max_len = 0;
> >      uint8_t type, prv, crt;
> > +    uint64_t addr;
> > +
> > +    if (ver == SMBIOS_VER21) {
> > +        addr = le32_to_cpu(ep_table->ep21.structure_table_address);
> > +    } else {
> > +        addr = le64_to_cpu(ep_table->ep30.structure_table_address);
> > +    }
> >
> >      /* walk the smbios tables */
> > -    for (i = 0; i < le16_to_cpu(ep_table->number_of_structures); i++) {
> > +    do {
> >
> >          /* grab type and formatted area length from struct header */
> >          type = qtest_readb(data->qts, addr);
> > @@ -660,19 +705,23 @@ static void test_smbios_structs(test_data *data)
> >          }
> >
> >          /* keep track of max. struct size */
> > -        if (max_len < len) {
> > +        if (ver == SMBIOS_VER21 && max_len < len) {
> >              max_len = len;
> > -            g_assert_cmpuint(max_len, <=, ep_table->max_structure_size);
> > +            g_assert_cmpuint(max_len, <=, 
> > ep_table->ep21.max_structure_size);
> >          }
> >
> >          /* start of next structure */
> >          addr += len;
> > -    }
> >
> > -    /* total table length and max struct size must match entry point 
> > values */
> > -    g_assert_cmpuint(le16_to_cpu(ep_table->structure_table_length), ==,
> > -                     addr - 
> > le32_to_cpu(ep_table->structure_table_address));
> > -    g_assert_cmpuint(le16_to_cpu(ep_table->max_structure_size), ==, 
> > max_len);
> > +    } while (ver == SMBIOS_VER21 ?
> > +                (++i < le16_to_cpu(ep_table->ep21.number_of_structures)) : 
> > (type != 127));
>
> This is quite an unreadable way to specify the loop condition.  I
> wonder if there is a better way to structure this.
> Secondly, instead of hardcoding 127 why do we not say (type < 
> SMBIOS_MAX_TYPE) ?

Here we are looking for a special structure type 127. There can be up
to 256 structure types, and they can be placed before the final
structure.

But it seems like we need to change SMBIOS_MAX_TYPE in the test.

> > +
> > +    if (ver == SMBIOS_VER21) {
> > +        /* total table length and max struct size must match entry point 
> > values */
> > +        
> > g_assert_cmpuint(le16_to_cpu(ep_table->ep21.structure_table_length), ==,
> > +                         addr - 
> > le32_to_cpu(ep_table->ep21.structure_table_address));
> > +        g_assert_cmpuint(le16_to_cpu(ep_table->ep21.max_structure_size), 
> > ==, max_len);
> > +    }
> >
> >      /* required struct types must all be present */
> >      for (i = 0; i < data->required_struct_types_len; i++) {
> > @@ -756,8 +805,8 @@ static void test_acpi_one(const char *params, test_data 
> > *data)
> >       * https://bugs.launchpad.net/qemu/+bug/1821884
> >       */
> >      if (!use_uefi) {
> > -        test_smbios_entry_point(data);
> > -        test_smbios_structs(data);
> > +        int ver = test_smbios_entry_point(data);
> > +        test_smbios_structs(data, ver);
> >      }
> >
> >      qtest_quit(data->qts);
> > --
> > 2.35.1
> >
>