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G-stage address translation

Paul Donahue
 

I think that there are a few problems in section 5.5.1 of the hypervisor spec.  It says that G-stage translation follows the same algorithm as section 4.3.2 with a few changes.  However:
1. the first bullet refers to step 1 of section 4.3.2 but should refer to step 2
2. it should specify that VALEN is 34/41/50 for Sv32x4/Sv39x4/Sv48x4
3. it should say that step 1 of 4.3.2 checks for zero extension rather than sign extension


Thanks,

-Paul
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