diff options
Diffstat (limited to 'migration/postcopy-ram.c')
| -rw-r--r-- | migration/postcopy-ram.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index 7d24dac397..d7b48dd920 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -36,6 +36,7 @@ #include "yank_functions.h" #include "tls.h" #include "qemu/userfaultfd.h" +#include "qemu/mmap-alloc.h" /* Arbitrary limit on size of each discard command, * keeps them around ~200 bytes @@ -336,11 +337,12 @@ static bool ufd_check_and_apply(int ufd, MigrationIncomingState *mis) /* Callback from postcopy_ram_supported_by_host block iterator. */ -static int test_ramblock_postcopiable(RAMBlock *rb, void *opaque) +static int test_ramblock_postcopiable(RAMBlock *rb) { const char *block_name = qemu_ram_get_idstr(rb); ram_addr_t length = qemu_ram_get_used_length(rb); size_t pagesize = qemu_ram_pagesize(rb); + QemuFsType fs; if (length % pagesize) { error_report("Postcopy requires RAM blocks to be a page size multiple," @@ -348,6 +350,15 @@ static int test_ramblock_postcopiable(RAMBlock *rb, void *opaque) "page size of 0x%zx", block_name, length, pagesize); return 1; } + + if (rb->fd >= 0) { + fs = qemu_fd_getfs(rb->fd); + if (fs != QEMU_FS_TYPE_TMPFS && fs != QEMU_FS_TYPE_HUGETLBFS) { + error_report("Host backend files need to be TMPFS or HUGETLBFS only"); + return 1; + } + } + return 0; } @@ -366,6 +377,7 @@ bool postcopy_ram_supported_by_host(MigrationIncomingState *mis) struct uffdio_range range_struct; uint64_t feature_mask; Error *local_err = NULL; + RAMBlock *block; if (qemu_target_page_size() > pagesize) { error_report("Target page size bigger than host page size"); @@ -390,9 +402,23 @@ bool postcopy_ram_supported_by_host(MigrationIncomingState *mis) goto out; } - /* We don't support postcopy with shared RAM yet */ - if (foreach_not_ignored_block(test_ramblock_postcopiable, NULL)) { - goto out; + /* + * We don't support postcopy with some type of ramblocks. + * + * NOTE: we explicitly ignored ramblock_is_ignored() instead we checked + * all possible ramblocks. This is because this function can be called + * when creating the migration object, during the phase RAM_MIGRATABLE + * is not even properly set for all the ramblocks. + * + * A side effect of this is we'll also check against RAM_SHARED + * ramblocks even if migrate_ignore_shared() is set (in which case + * we'll never migrate RAM_SHARED at all), but normally this shouldn't + * affect in reality, or we can revisit. + */ + RAMBLOCK_FOREACH(block) { + if (test_ramblock_postcopiable(block)) { + goto out; + } } /* |