Juan Quintela <quint...@redhat.com> writes: > Fabiano Rosas <faro...@suse.de> wrote: >> Juan Quintela <quint...@redhat.com> writes: >> >>> Fabiano Rosas <faro...@suse.de> wrote: >>> D> Juan Quintela <quint...@redhat.com> writes: >>>> >>>>> From: Fabiano Rosas <faro...@suse.de> >>>>> >>>>> Add basic tests for file-based migration. >>>>> >>>>> Note that we cannot use test_precopy_common because that routine >>>>> expects it to be possible to run the migration live. With the file >>>>> transport there is no live migration because we must wait for the >>>>> source to finish writing the migration data to the file before the >>>>> destination can start reading. Add a new migration function >>>>> specifically to handle the file migration. >>>>> >>>>> Reviewed-by: Peter Xu <pet...@redhat.com> >>>>> Reviewed-by: Juan Quintela <quint...@redhat.com> >>>>> Signed-off-by: Fabiano Rosas <faro...@suse.de> >>>>> Signed-off-by: Juan Quintela <quint...@redhat.com> >>>>> Message-ID: <20230712190742.22294-7-faro...@suse.de> >>> >>>>> +static void file_offset_finish_hook(QTestState *from, QTestState *to, >>>>> + void *opaque) >>>>> +{ >>>>> +#if defined(__linux__) >>>>> + g_autofree char *path = g_strdup_printf("%s/%s", tmpfs, >>>>> FILE_TEST_FILENAME); >>>>> + size_t size = FILE_TEST_OFFSET + sizeof(QEMU_VM_FILE_MAGIC); >>>>> + uintptr_t *addr, *p; >>>>> + int fd; >>>>> + >>>>> + fd = open(path, O_RDONLY); >>>>> + g_assert(fd != -1); >>>>> + addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0); >>>>> + g_assert(addr != MAP_FAILED); >>>>> + >>>>> + /* >>>>> + * Ensure the skipped offset contains zeros and the migration >>>>> + * stream starts at the right place. >>>>> + */ >>>>> + p = addr; >>>>> + while (p < addr + FILE_TEST_OFFSET / sizeof(uintptr_t)) { >>>>> + g_assert(*p == 0); >>>>> + p++; >>>>> + } >>>>> + g_assert_cmpint(cpu_to_be32(*p), ==, QEMU_VM_FILE_MAGIC); >>>> >>>> This truncates to 32-bits, so it breaks on a BE host. We need this: >>>> >>>> -->8-- >>>> From ea0c2d1c988add48d9754891a9fc7f6854a9718a Mon Sep 17 00:00:00 2001 >>>> From: Fabiano Rosas <faro...@suse.de> >>>> Date: Mon, 16 Oct 2023 15:21:49 -0300 >>>> Subject: [PATCH] fixup! tests/qtest: migration-test: Add tests for >>>> file-based >>>> migration >>>> >>>> --- >>>> tests/qtest/migration-test.c | 2 +- >>>> 1 file changed, 1 insertion(+), 1 deletion(-) >>>> >>>> diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c >>>> index da02b6d692..e1c110537b 100644 >>>> --- a/tests/qtest/migration-test.c >>>> +++ b/tests/qtest/migration-test.c >>>> @@ -1966,7 +1966,7 @@ static void file_offset_finish_hook(QTestState >>>> *from, QTestState *to, >>>> g_assert(*p == 0); >>>> p++; >>>> } >>>> - g_assert_cmpint(cpu_to_be32(*p), ==, QEMU_VM_FILE_MAGIC); >>>> + g_assert_cmpint(cpu_to_be64(*p) >> 32, ==, QEMU_VM_FILE_MAGIC); >>>> >>>> munmap(addr, size); >>>> close(fd); >>> >>> I am resubmitting with this change. >>> >>> But I think we need to change this: >>> >>>>> + g_autofree char *path = g_strdup_printf("%s/%s", tmpfs, >>>>> FILE_TEST_FILENAME); >>>>> + size_t size = FILE_TEST_OFFSET + sizeof(QEMU_VM_FILE_MAGIC); >>>>> + uintptr_t *addr, *p; >>> >>> I think we should change the test so the file is 64 bits on every >>> architecture. >>> Then we can cast to void * or uintptr_t as needed. >> >> Hm, I don't get what you mean here. What needs to be 64 bits? > > size_t is 32 bits on 32bits host, and 64 bits on 64 bits host. > uintprt_t is the same.
Right, I have thought of that when writing this fix yesterday, but I dismissed it because I thought we were never have a 32bit host running these tests. > So using explicit sizes: > > static void file_offset_finish_hook(QTestState *from, QTestState *to, > void *opaque) > { > #if defined(__linux__) > g_autofree char *path = g_strdup_printf("%s/%s", tmpfs, > FILE_TEST_FILENAME); > size_t size = FILE_TEST_OFFSET + sizeof(QEMU_VM_FILE_MAGIC); > uint64_t *addr, *p; > int fd; > > fd = open(path, O_RDONLY); > g_assert(fd != -1); > addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0); > g_assert(addr != MAP_FAILED); > > /* > * Ensure the skipped offset contains zeros and the migration > * stream starts at the right place. > */ > p = addr; > while (p < (uintprt_t)addr + FILE_TEST_OFFSET) { > g_assert(*p == 0); > p++; > } > g_assert_cmpint(cpu_to_be64(*p) >> 32, ==, QEMU_VM_FILE_MAGIC); > > munmap(addr, size); > close(fd); > #endif > } > > This is completely untested, but it should make sure that we are reading > 64bits integers in both 32 and 64 bits hosts, no? Looks like it. I can give it a try and send an update as a separate patch.