Re: [Qemu-devel] [PATCH 7/8] tests: Use qpci_mem{read, write} in ivshmem-test

[Laurent Vivier <lvivier@redhat.com>]

On 18/10/2016 12:52, David Gibson wrote:
> ivshmem implements a block of shared memory in a PCI BAR.  Currently our
> test case accesses this using qtest_mem{read,write}.  However, deducing
> the correct addresses for these requires making assumptions about the
> internel format returned by qpci_iomap(), along with some ugly casts.
> 
> This patch changes the test to use the new qpci_mem{read,write} interfaces
> which is neater.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

I think your changes break this test.

There is two guest, so we need to access them through two sockets,
defined in s1->qtest and s2->qtest.

But qpci_memXXX() always use memread(...) and thus
qtest_memread(global_qtest, ...) , so always test the last guest started.

You must swap global_qtest as it is done in in_reg()/out_reg() before
your qpci_memXXX() in test_ivshmem_pair().

Laurent

> ---
>  tests/ivshmem-test.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/tests/ivshmem-test.c b/tests/ivshmem-test.c
> index f36bfe7..97a887e 100644
> --- a/tests/ivshmem-test.c
> +++ b/tests/ivshmem-test.c
> @@ -169,7 +169,7 @@ static void test_ivshmem_single(void)
>      for (i = 0; i < G_N_ELEMENTS(data); i++) {
>          data[i] = i;
>      }
> -    qtest_memwrite(s->qtest, (uintptr_t)s->mem_base, data, sizeof(data));
> +    qpci_memwrite(s->dev, s->mem_base, data, sizeof(data));
>  
>      /* verify write */
>      for (i = 0; i < G_N_ELEMENTS(data); i++) {
> @@ -178,7 +178,7 @@ static void test_ivshmem_single(void)
>  
>      /* read it back and verify read */
>      memset(data, 0, sizeof(data));
> -    qtest_memread(s->qtest, (uintptr_t)s->mem_base, data, sizeof(data));
> +    qpci_memread(s->dev, s->mem_base, data, sizeof(data));
>      for (i = 0; i < G_N_ELEMENTS(data); i++) {
>          g_assert_cmpuint(data[i], ==, i);
>      }
> @@ -201,29 +201,29 @@ static void test_ivshmem_pair(void)
>  
>      /* host write, guest 1 & 2 read */
>      memset(tmpshmem, 0x42, TMPSHMSIZE);
> -    qtest_memread(s1->qtest, (uintptr_t)s1->mem_base, data, TMPSHMSIZE);
> +    qpci_memread(s1->dev, s1->mem_base, data, TMPSHMSIZE);
>      for (i = 0; i < TMPSHMSIZE; i++) {
>          g_assert_cmpuint(data[i], ==, 0x42);
>      }
> -    qtest_memread(s2->qtest, (uintptr_t)s2->mem_base, data, TMPSHMSIZE);
> +    qpci_memread(s2->dev, s2->mem_base, data, TMPSHMSIZE);
>      for (i = 0; i < TMPSHMSIZE; i++) {
>          g_assert_cmpuint(data[i], ==, 0x42);
>      }
>  
>      /* guest 1 write, guest 2 read */
>      memset(data, 0x43, TMPSHMSIZE);
> -    qtest_memwrite(s1->qtest, (uintptr_t)s1->mem_base, data, TMPSHMSIZE);
> +    qpci_memwrite(s1->dev, s1->mem_base, data, TMPSHMSIZE);
>      memset(data, 0, TMPSHMSIZE);
> -    qtest_memread(s2->qtest, (uintptr_t)s2->mem_base, data, TMPSHMSIZE);
> +    qpci_memread(s2->dev, s2->mem_base, data, TMPSHMSIZE);
>      for (i = 0; i < TMPSHMSIZE; i++) {
>          g_assert_cmpuint(data[i], ==, 0x43);
>      }
>  
>      /* guest 2 write, guest 1 read */
>      memset(data, 0x44, TMPSHMSIZE);
> -    qtest_memwrite(s2->qtest, (uintptr_t)s2->mem_base, data, TMPSHMSIZE);
> +    qpci_memwrite(s2->dev, s2->mem_base, data, TMPSHMSIZE);
>      memset(data, 0, TMPSHMSIZE);
> -    qtest_memread(s1->qtest, (uintptr_t)s2->mem_base, data, TMPSHMSIZE);
> +    qpci_memread(s1->dev, s2->mem_base, data, TMPSHMSIZE);
>      for (i = 0; i < TMPSHMSIZE; i++) {
>          g_assert_cmpuint(data[i], ==, 0x44);
>      }
>