[PATCH v2 02/17] tests/qtest/ide-test: cover a CHS translation with zero sectors

["Denis V. Lunev" <den@openvz.org>]

From: Denis V. Lunev <den@openvz.org>

Ask for zero sectors per logical track via INITIALIZE DEVICE PARAMETERS
and check that the command is aborted, that IDENTIFY DEVICE still reports
the translation that was in effect before, and that a CHS read then
completes normally rather than killing QEMU with SIGFPE.

Cc: John Snow <jsnow@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
---
 tests/qtest/ide-test.c | 62 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/tests/qtest/ide-test.c b/tests/qtest/ide-test.c
index b36b0f8875..99aa5e039c 100644
--- a/tests/qtest/ide-test.c
+++ b/tests/qtest/ide-test.c
@@ -95,6 +95,7 @@ enum {
 
 enum {
     CMD_DSM         = 0x06,
+    CMD_READ        = 0x20,  /* READ SECTOR(S) */
     CMD_DIAGNOSE    = 0x90,
     CMD_INIT_DP     = 0x91,  /* INITIALIZE DEVICE PARAMETERS */
     CMD_READ_DMA    = 0xc8,
@@ -1194,6 +1195,66 @@ static void cdrom_read_impl(int nblocks, unsigned flags)
     free_pci_device(dev);
 }
 
+/* Zero sectors per track has to abort (ATA-5 8.16.6), not divide by zero */
+static void test_specify_zero_sectors(void)
+{
+    QTestState *qts;
+    QPCIDevice *dev;
+    QPCIBar bmdma_bar, ide_bar;
+    uint16_t buf[256];
+    uint8_t data;
+    int i;
+
+    qts = ide_test_start(
+        "-blockdev driver=file,node-name=hda,filename=%s "
+        "-device ide-hd,drive=hda,bus=ide.0,unit=0 ",
+        tmp_path[0]);
+
+    dev = get_pci_device(qts, &bmdma_bar, &ide_bar);
+
+    qpci_io_writeb(dev, ide_bar, reg_nsectors, 0);
+    qpci_io_writeb(dev, ide_bar, reg_device, 0);
+    qpci_io_writeb(dev, ide_bar, reg_command, CMD_INIT_DP);
+
+    assert_bit_set(qpci_io_readb(dev, ide_bar, reg_status), ERR);
+    assert_bit_set(qpci_io_readb(dev, ide_bar, reg_error), ABRT);
+
+    /* The refused request has to leave the default translation in effect */
+    qpci_io_writeb(dev, ide_bar, reg_device, 0);
+    qpci_io_writeb(dev, ide_bar, reg_command, CMD_IDENTIFY);
+    for (i = 0; i < 256; i++) {
+        buf[i] = qpci_io_readw(dev, ide_bar, reg_data);
+    }
+    g_assert_cmpint(buf[55], ==, 16);
+    g_assert_cmpint(buf[56], ==, 63);
+
+    /* READ SECTOR(S) of CHS 0/0/1, which used to crash QEMU */
+    qpci_io_writeb(dev, ide_bar, reg_nsectors, 1);
+    qpci_io_writeb(dev, ide_bar, reg_lba_low, 1);
+    qpci_io_writeb(dev, ide_bar, reg_lba_middle, 0);
+    qpci_io_writeb(dev, ide_bar, reg_lba_high, 0);
+    qpci_io_writeb(dev, ide_bar, reg_device, 0);
+    qpci_io_writeb(dev, ide_bar, reg_command, CMD_READ);
+
+    data = ide_wait_clear(qts, BSY);
+    assert_bit_set(data, DRQ);
+    assert_bit_clear(data, ERR | DF);
+    for (i = 0; i < 256; i++) {
+        buf[i] = qpci_io_readw(dev, ide_bar, reg_data);
+    }
+    assert_bit_clear(qpci_io_readb(dev, ide_bar, reg_status), ERR | DF | DRQ);
+
+    /* A supported translation is still accepted */
+    qpci_io_writeb(dev, ide_bar, reg_nsectors, 32);
+    qpci_io_writeb(dev, ide_bar, reg_device, 7);
+    qpci_io_writeb(dev, ide_bar, reg_command, CMD_INIT_DP);
+
+    assert_bit_clear(qpci_io_readb(dev, ide_bar, reg_status), ERR);
+
+    ide_test_quit(qts);
+    free_pci_device(dev);
+}
+
 static void test_cdrom_pio(void)
 {
     cdrom_read_impl(1, CDROM_PIO);
@@ -1265,6 +1326,7 @@ int main(int argc, char **argv)
     g_test_init(&argc, &argv, NULL);
 
     qtest_add_func("/ide/read_native", test_specify);
+    qtest_add_func("/ide/specify/zero_sectors", test_specify_zero_sectors);
 
     qtest_add_func("/ide/identify", test_identify);
 
-- 
2.53.0