[qemu-xen staging] hw/sd/sdcard: Restrict Class 6 commands to SCSD cards

[patchbot@xxxxxxx]

commit 9157dd597d293ab7f599f4d96c3fe8a6e07c633d
Author:     Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
AuthorDate: Wed Jun 3 19:59:16 2020 +0200
Commit:     Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
CommitDate: Tue Jul 14 15:45:58 2020 +0200

    hw/sd/sdcard: Restrict Class 6 commands to SCSD cards
    
    Only SCSD cards support Class 6 (Block Oriented Write Protection)
    commands.
    
      "SD Specifications Part 1 Physical Layer Simplified Spec. v3.01"
    
      4.3.14 Command Functional Difference in Card Capacity Types
    
      * Write Protected Group
    
      SDHC and SDXC do not support write-protected groups. Issuing
      CMD28, CMD29 and CMD30 generates the ILLEGAL_COMMAND error.
    
    Cc: qemu-stable@xxxxxxxxxx
    Reviewed-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
    Signed-off-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
    Reviewed-by: Alistair Francis <alistair.francis@xxxxxxx>
    Message-Id: <20200630133912.9428-7-f4bug@xxxxxxxxx>
---
 hw/sd/sd.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 5137168d66..1cc16bfd31 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -920,6 +920,11 @@ static sd_rsp_type_t sd_normal_command(SDState *sd, 
SDRequest req)
         sd->multi_blk_cnt = 0;
     }
 
+    if (sd_cmd_class[req.cmd] == 6 && FIELD_EX32(sd->ocr, OCR, CARD_CAPACITY)) 
{
+        /* Only Standard Capacity cards support class 6 commands */
+        return sd_illegal;
+    }
+
     switch (req.cmd) {
     /* Basic commands (Class 0 and Class 1) */
     case 0:    /* CMD0:   GO_IDLE_STATE */
--
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