What Fault should be reported if MSI page access permissions check failed?

riscv-non-isa / riscv-iommu

RISC-V IOMMU Specification

https://jira.riscv.org/browse/RVG-55

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Closed zhuotianshu closed 3 months ago

zhuotianshu commented 3 months ago

If requesting X permission to MSI region, what fault should be reported by IOMMU? Should it be Instruction guest page fault (cause=20)?

ved-rivos commented 3 months ago

If execute permission is requested and G-stage does not provide execute permission then a instruction guest page fault occurs.