Should HLVX effect vsstatus.SUM?

[Wangrodman]

The hypervisor uses HLVX to emulate guest execute code, and SUM is used to modify load and store. Does HLVX get affected by vsstatus.SUM?

[gfavor]

The H spec says that HLVX differs from HLV only in that "execute permission takes the place of read permission during address translation". And the spec for all the H*V* instructions says that "the explicit memory access is done *as though in* VU-mode when SPVP=0, and *as though in* VS-mode when SPVP=1. As usual when V=1, two-stage address translation is applied, and the HS-level sstatus.SUM is ignored." So the question is equivalent to whether a normal guest load is affected by vsstatus.SUM. Which is equivalent to whether a normal host load is affected by sstatus.SUM. Namely yes (in the ways defined by SUM). Greg

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[Wangrodman]

Thanks for your clarification