SD/MMC patches queue

- Return noise (dummy byte) when no SD card connected over SPI
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Merge tag 'sdmmc-20250812' of https://github.com/philmd/qemu into staging

SD/MMC patches queue

- Return noise (dummy byte) when no SD card connected over SPI

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* tag 'sdmmc-20250812' of https://github.com/philmd/qemu:
  tests/functional: Test SPI-SD adapter without SD card connected
  hw/sd/ssi-sd: Return noise (dummy byte) when no card connected

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

hw/sd/ssi-sd.c

@@ -89,6 +89,10 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
     SDRequest request;
     uint8_t longresp[5];
 
+    if (!sdbus_get_inserted(&s->sdbus)) {
+        return SSI_DUMMY;
+    }
+
     /*
      * Special case: allow CMD12 (STOP TRANSMISSION) while reading data.
      *

tests/functional/test_riscv64_sifive_u.py

@@ -27,25 +27,37 @@ class SifiveU(LinuxKernelTest):
          'rootfs.ext2.gz'),
         'b6ed95610310b7956f9bf20c4c9c0c05fea647900df441da9dfe767d24e8b28b')
 
-    def test_riscv64_sifive_u_mmc_spi(self):
+    def do_test_riscv64_sifive_u_mmc_spi(self, connect_card):
         self.set_machine('sifive_u')
         kernel_path = self.ASSET_KERNEL.fetch()
         rootfs_path = self.uncompress(self.ASSET_ROOTFS)
 
         self.vm.set_console()
         kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
-                               'root=/dev/mmcblk0 rootwait '
                                'earlycon=sbi console=ttySIF0 '
-                               'panic=-1 noreboot')
+                               'root=/dev/mmcblk0 ')
         self.vm.add_args('-kernel', kernel_path,
-                         '-drive', f'file={rootfs_path},if=sd,format=raw',
                          '-append', kernel_command_line,
                          '-no-reboot')
+        if connect_card:
+            kernel_command_line += 'panic=-1 noreboot rootwait '
+            self.vm.add_args('-drive', f'file={rootfs_path},if=sd,format=raw')
+            pattern = 'Boot successful.'
+        else:
+            kernel_command_line += 'panic=0 noreboot '
+            pattern = 'Cannot open root device "mmcblk0" or unknown-block(0,0)'
+
         self.vm.launch()
-        self.wait_for_console_pattern('Boot successful.')
+        self.wait_for_console_pattern(pattern)
 
         os.remove(rootfs_path)
 
+    def test_riscv64_sifive_u_nommc_spi(self):
+        self.do_test_riscv64_sifive_u_mmc_spi(False)
+
+    def test_riscv64_sifive_u_mmc_spi(self):
+        self.do_test_riscv64_sifive_u_mmc_spi(True)
+
 
 if __name__ == '__main__':
     LinuxKernelTest.main()