From: Jan Luebbe <jlu@pengutronix.de>
Date: Mon, 28 Oct 2024 16:23:08 +0000 (+0100)
Subject: hw/sd/sdcard: Fix calculation of size when using eMMC boot partitions
X-Git-Tag: pull-vmclock-20250108~87^2~8
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=c078298301a8c72fe12da85d94372689196628bc;p=users%2Fdwmw2%2Fqemu.git

hw/sd/sdcard: Fix calculation of size when using eMMC boot partitions

The sd_bootpart_offset() function calculates the *runtime* offset which
changes as the guest switches between accessing the main user data area
and the boot partitions by writing to the EXT_CSD_PART_CONFIG_ACC_MASK
bits, so it shouldn't be used to calculate the main user data area size.

Instead, subtract the boot_part_size directly (twice, as there are two
identical boot partitions defined by the eMMC spec).

Suggested-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Fixes: c8cb19876d3e ("hw/sd/sdcard: Support boot area in emmc image")
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
---

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index b2e2d58e01..f9bd03f3fd 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -834,7 +834,9 @@ static void sd_reset(DeviceState *dev)
         sect = 0;
     }
     size = sect << HWBLOCK_SHIFT;
-    size -= sd_bootpart_offset(sd);
+    if (sd_is_emmc(sd)) {
+        size -= sd->boot_part_size * 2;
+    }
 
     sect = sd_addr_to_wpnum(size) + 1;