Re: [PATCH v2] soc: qcom: cmd-db: Map shared memory as WC, not WB

On Thu, 18 Jul 2024 11:33:23 +0530, Maulik Shah wrote:

Linux does not write into cmd-db region. This region of memory is write protected by XPU. XPU may sometime falsely detect clean cache eviction as "write" into the write protected region leading to secure interrupt which causes an endless loop somewhere in Trust Zone.

The only reason it is working right now is because Qualcomm Hypervisor maps the same region as Non-Cacheable memory in Stage 2 translation tables. The issue manifests if we want to use another hypervisor (like Xen or KVM), which does not know anything about those specific mappings.

[...]

Applied, thanks!

[1/1] soc: qcom: cmd-db: Map shared memory as WC, not WB commit: f9bb896eab221618927ae6a2f1d566567999839d

Best regards,