win-dmp becomes available only once the guest exposes a Windows dump header through vmcoreinfo. Forge exactly such a note (an ELF note header followed by a WinDumpHeader64 carrying the PAGE/DU64 signatures, the layout a Windows guest with the QEMU vmcoreinfo writer produces), place it in guest RAM, point the vmcoreinfo device at it via fw_cfg, and check that win-dmp flips from unavailable to available.
This exercises win_dump_available()'s positive path without a real Windows guest. It only covers availability reporting; the actual win-dmp generation (create_win_dump()) needs real Windows kernel structures and is not exercised here. The test is registered only on x86_64 with a vmcoreinfo device present. Signed-off-by: Denis V. Lunev <[email protected]> --- tests/qtest/dump-test.c | 94 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) diff --git a/tests/qtest/dump-test.c b/tests/qtest/dump-test.c index 6afaa2c2ea..30c95a3528 100644 --- a/tests/qtest/dump-test.c +++ b/tests/qtest/dump-test.c @@ -12,10 +12,15 @@ #include "qemu/osdep.h" #include "libqtest.h" +#include "libqos/libqos-pc.h" +#include "libqos/fw_cfg.h" #include "qobject/qdict.h" #include "qobject/qlist.h" #include "qobject/qstring.h" #include "qemu/bswap.h" +#include "qemu/win_dump_defs.h" +#include "standard-headers/linux/qemu_fw_cfg.h" +#include "hw/misc/vmcoreinfo.h" #include "elf.h" #define KDUMP_RAW_MAGIC "KDUMP " @@ -215,6 +220,90 @@ static void test_dump_win_dmp_unavailable(void) qtest_quit(qts); } +static bool capability_has_format(QTestState *qts, const char *want) +{ + QDict *resp, *ret; + QList *formats; + QListEntry *e; + bool found = false; + + resp = qtest_qmp(qts, + "{ 'execute': 'query-dump-guest-memory-capability' }"); + g_assert(qdict_haskey(resp, "return")); + ret = qdict_get_qdict(resp, "return"); + formats = qdict_get_qlist(ret, "formats"); + g_assert_nonnull(formats); + + QLIST_FOREACH_ENTRY(formats, e) { + QString *qs = qobject_to(QString, qlist_entry_obj(e)); + + if (g_str_equal(qstring_get_str(qs), want)) { + found = true; + } + } + qobject_unref(resp); + return found; +} + +/* + * win-dmp becomes available only once the guest exposes a Windows dump + * header through vmcoreinfo. Forge exactly such a note -- the layout a + * Windows guest with the QEMU vmcoreinfo writer produces: a fixed-size ELF + * note header followed by a WinDumpHeader64 carrying the PAGE/DU64 + * signatures -- place it in guest RAM, point the vmcoreinfo device at it + * via fw_cfg, and check that win-dmp flips from unavailable to available. + * + * This only covers availability *reporting*; the actual win-dmp generation + * (create_win_dump()) needs real Windows kernel structures and is not + * exercised here. + */ +static void test_dump_win_dmp_available(void) +{ + const uint64_t paddr = 0x800000; /* 8 MiB, inside guest RAM */ + size_t notesz = VMCOREINFO_WIN_DUMP_NOTE_SIZE64; + g_autofree uint8_t *note = g_malloc0(notesz); + Elf64_Nhdr *nhdr = (Elf64_Nhdr *)note; + WinDumpHeader64 *hdr; + FWCfgVMCoreInfo info; + QFWCFG *fw_cfg; + QOSState *qs; + + /* the WinDumpHeader64 must sit right after the fixed ELF note header */ + g_assert_cmpint(sizeof(WinDumpHeader64) % 4, ==, 0); + + nhdr->n_namesz = cpu_to_le32(sizeof("VMCOREINFO")); /* 11 -> padded 12 */ + nhdr->n_descsz = cpu_to_le32(sizeof(WinDumpHeader64)); + nhdr->n_type = 0; + memcpy(note + sizeof(Elf64_Nhdr), "VMCOREINFO", sizeof("VMCOREINFO") - 1); + + hdr = (WinDumpHeader64 *)(note + VMCOREINFO_ELF_NOTE_HDR_SIZE); + memcpy(hdr->Signature, "PAGE", sizeof(hdr->Signature)); + memcpy(hdr->ValidDump, "DU64", sizeof(hdr->ValidDump)); + + qs = qtest_pc_boot("-device vmcoreinfo -m 16"); + fw_cfg = pc_fw_cfg_init(qs->qts); + + /* with no guest note yet, win-dmp must not be advertised */ + g_assert_false(capability_has_format(qs->qts, "win-dmp")); + + /* place the forged note in guest RAM and point vmcoreinfo at it */ + qtest_memwrite(qs->qts, paddr, note, notesz); + + memset(&info, 0, sizeof(info)); + info.host_format = cpu_to_le16(FW_CFG_VMCOREINFO_FORMAT_ELF); + info.guest_format = cpu_to_le16(FW_CFG_VMCOREINFO_FORMAT_ELF); + info.size = cpu_to_le32(notesz); + info.paddr = cpu_to_le64(paddr); + qfw_cfg_write_file(fw_cfg, qs, FW_CFG_VMCOREINFO_FILENAME, + &info, sizeof(info)); + + /* now win-dmp must be reported as available */ + g_assert_true(capability_has_format(qs->qts, "win-dmp")); + + pc_fw_cfg_uninit(fw_cfg); + qtest_shutdown(qs); +} + int main(int argc, char **argv) { const char *arch = qtest_get_arch(); @@ -231,6 +320,11 @@ int main(int argc, char **argv) if (g_str_equal(arch, "x86_64")) { qtest_add_func("/dump/win-dmp-unavailable", test_dump_win_dmp_unavailable); + + if (qtest_has_device("vmcoreinfo")) { + qtest_add_func("/dump/win-dmp-available", + test_dump_win_dmp_available); + } } return g_test_run(); -- 2.53.0
