[coreboot-gerrit] Patch set updated for coreboot: vbnv: Do not silently reset cache in read_vbnv
Furquan Shaikh (furquan@google.com)
gerrit at coreboot.org
Tue Jun 28 01:23:36 CEST 2016
Furquan Shaikh (furquan at google.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15457
-gerrit
commit 2aed33345f3fc90da0e14c49f3fbc98fc7424b61
Author: Furquan Shaikh <furquan at google.com>
Date: Mon Jun 27 16:19:09 2016 -0700
vbnv: Do not silently reset cache in read_vbnv
Currently, read_vbnv performs a reset of the vbnv cache if it is not
valid. However, this information is not passed up to the vboot layer,
thus resulting in missed write-back of vbnv cache to storage if vboot
does not update the cache itself.
Update read_vbnv to return a value depending upon whether it wants a
write-back to be performed when save is called.
Return value:
0 = No write-back required
1 = Write-back of VBNV cache is required.
Change-Id: I239939d5f9731d89a9d53fe662321b93fc1ab113
Signed-off-by: Furquan Shaikh <furquan at google.com>
---
src/vendorcode/google/chromeos/vbnv.c | 15 +++++++++++----
src/vendorcode/google/chromeos/vbnv.h | 2 +-
src/vendorcode/google/chromeos/vboot2/vboot_logic.c | 3 ++-
3 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/src/vendorcode/google/chromeos/vbnv.c b/src/vendorcode/google/chromeos/vbnv.c
index 92f03fb..7b257f7 100644
--- a/src/vendorcode/google/chromeos/vbnv.c
+++ b/src/vendorcode/google/chromeos/vbnv.c
@@ -85,8 +85,12 @@ int verify_vbnv(uint8_t *vbnv_copy)
(crc8_vbnv(vbnv_copy, CRC_OFFSET) == vbnv_copy[CRC_OFFSET]);
}
-/* Read VBNV data from configured storage backend. */
-void read_vbnv(uint8_t *vbnv_copy)
+/*
+ * Read VBNV data from configured storage backend.
+ * If VBNV verification fails, reset the vbnv copy.
+ * Returns 1 if write-back of vbnv copy is required. Else, returns 0.
+ */
+uint8_t read_vbnv(uint8_t *vbnv_copy)
{
if (IS_ENABLED(CONFIG_CHROMEOS_VBNV_CMOS))
read_vbnv_cmos(vbnv_copy);
@@ -96,8 +100,11 @@ void read_vbnv(uint8_t *vbnv_copy)
read_vbnv_flash(vbnv_copy);
/* Check data for consistency */
- if (!verify_vbnv(vbnv_copy))
- reset_vbnv(vbnv_copy);
+ if (verify_vbnv(vbnv_copy))
+ return 0;
+
+ reset_vbnv(vbnv_copy);
+ return 1;
}
/*
diff --git a/src/vendorcode/google/chromeos/vbnv.h b/src/vendorcode/google/chromeos/vbnv.h
index 5d21cc8..e8cd99d 100644
--- a/src/vendorcode/google/chromeos/vbnv.h
+++ b/src/vendorcode/google/chromeos/vbnv.h
@@ -19,7 +19,7 @@
#include <types.h>
/* Generic functions */
-void read_vbnv(uint8_t *vbnv_copy);
+uint8_t read_vbnv(uint8_t *vbnv_copy);
void save_vbnv(const uint8_t *vbnv_copy);
int verify_vbnv(uint8_t *vbnv_copy);
int get_recovery_mode_from_vbnv(void);
diff --git a/src/vendorcode/google/chromeos/vboot2/vboot_logic.c b/src/vendorcode/google/chromeos/vboot2/vboot_logic.c
index a81a9c2..e704d1f 100644
--- a/src/vendorcode/google/chromeos/vboot2/vboot_logic.c
+++ b/src/vendorcode/google/chromeos/vboot2/vboot_logic.c
@@ -302,7 +302,8 @@ void verstage_main(void)
vb2_init_work_context(&ctx);
/* Read nvdata from a non-volatile storage */
- read_vbnv(ctx.nvdata);
+ if (read_vbnv(ctx.nvdata))
+ ctx.flags |= VB2_CONTEXT_NVDATA_CHANGED;
/* Set S3 resume flag if vboot should behave differently when selecting
* which slot to boot. This is only relevant to vboot if the platform
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