Messages in this thread | | | Date | Wed, 27 Mar 2024 21:45:03 +0100 | Subject | Re: [PATCH] soc: qcom: cmd-db: map shared memory as WT, not WB | From | Konrad Dybcio <> |
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On 27.03.2024 9:09 PM, Volodymyr Babchuk wrote: > It appears that hardware does not like cacheable accesses to this > region. Trying to access this shared memory region as Normal Memory > leads 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. This patch fixes the issue by mapping the shared memory as > Write-Through. This removes dependency on correct mappings in Stage 2 > tables. > > I tested this on SA8155P with Xen. > > Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com> > ---
Interesting..
+Doug, Rob have you ever seen this on Chrome? (FYI, Volodymyr, chromebooks ship with no qcom hypervisor)
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