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  1. 10 Feb, 2021 2 commits
  3. 09 Feb, 2021 5 commits
    • Manish V Badarkhe's avatar
      plat/arm: fvp: Protect GICR frames for fused/unused cores · f98630fb
      Manish V Badarkhe authored 
      

Currently, BLs are mapping the GIC memory region as read-write
for all cores on boot-up.

This opens up the security hole where the active core can write
the GICR frame of fused/inactive core. To avoid this issue, disable
the GICR frame of all inactive cores as below:

1. After primary CPU boots up, map GICR region of all cores as
   read-only.
2. After primary CPU boots up, map its GICR region as read-write
   and initialize its redistributor interface.
3. After secondary CPU boots up, map its GICR region as read-write
   and initialize its redistributor interface.
4. All unused/fused core's redistributor regions remain read-only and
   write attempt to such protected regions results in an exception.

As mentioned above, this patch offers only the GICR memory-mapped
region protection considering there is no facility at the GIC IP
level to avoid writing the redistributor area.

These changes are currently done in BL31 of Arm FVP and guarded under
the flag 'FVP_GICR_REGION_PROTECTION'.

As of now, this patch is tested manually as below:
1. Disable the FVP cores (core 1, 2, 3) with core 0 as an active core.
2. Verify data abort triggered by manually updating the ‘GICR_CTLR’
   register of core 1’s(fused) redistributor from core 0(active).

Change-Id: I86c99c7b41bae137b2011cf2ac17fad0a26e776d
Signed-off-by: default avatarManish V Badarkhe <Manish.Badarkhe@arm.com>
      f98630fb
    • Manish V Badarkhe's avatar
      doc: Build option to protect GICR frame · d30a6615
      Manish V Badarkhe authored 
      

Added a build option 'FVP_GICR_REGION_PROTECTION' to make
redistributor frame of fused/unused cores as read only.

Change-Id: Ie85f86e2465b93321a92a888ce8712a3144e4ccb
Signed-off-by: default avatarManish V Badarkhe <Manish.Badarkhe@arm.com>
      d30a6615
    • Manish V Badarkhe's avatar
      plat/arm: fvp: Do not map GIC region in BL1 and BL2 · e0cea783
      Manish V Badarkhe authored 
      

GIC memory region is not getting used in BL1 and BL2.
Hence avoid its mapping in BL1 and BL2 that freed some
page table entries to map other memory regions in the
future.

Retains mapping of CCN interconnect region in BL1 and BL2
overlapped with the GIC memory region.

Change-Id: I880dd0690f94b140e59e4ff0c0d436961b9cb0a7
Signed-off-by: default avatarManish V Badarkhe <Manish.Badarkhe@arm.com>
      e0cea783
    • Sandrine Bailleux's avatar
      Merge "fdts: use scmi_dvfs clock index 1 for cores 4-7" into integration · bb9ecd0d
      Sandrine Bailleux authored
      bb9ecd0d
    • Usama Arif's avatar
      fdts: use scmi_dvfs clock index 1 for cores 4-7 · a97c390b
      Usama Arif authored 
      

This allows Matterhorn cores to operate at their optimal OPPs.
Signed-off-by: default avatarUsama Arif <usama.arif@arm.com>
Change-Id: I2e1b784da10154a1f1f65dd0e3a39213e7683116
      a97c390b
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