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-AArch64: ISV is set to 1 in ESR_EL2 when taking a data abort with post-indexed instructions
-Description of problem:
-I think that I have a Qemu bug in my hands, but, I could still be missing something. Consider the following instruction:
-`0x0000000000000000:  C3 44 00 B8    str   w3, [x6], #4`
-
-notice the last #4, I think this is what we would call a post-indexed instruction (falls into the category of instructions with writeback). As I understand it, those instructions should not have ISV=1 in ESR_EL2 when faulting.
-
-Here is the relevant part of the manual:
-
-```
-For other faults reported in ESR_EL2, ISV is 0 except for the following stage 2 aborts:
-• AArch64 loads and stores of a single general-purpose register (including the register specified with 0b11111, including those with Acquire/Release semantics, but excluding Load Exclusive or Store Exclusive and excluding those with writeback).
-```
-
-However, I can see that Qemu sets ISV to 1 here. The ARM hardware that I tested gave me a value of ISV=0 for similar instructions.
-
-Another example of instruction: `0x00000000000002f8:  01 1C 40 38    ldrb  w1, [x0, #1]!`
-Steps to reproduce:
-1. Run some hypervisor in EL2
-2. Create a guest running at EL1 that executes one of the mentioned instructions (and make the instruction fault by writing to some unmapped page in SLP)
-3. Observe the value of ESR_EL2 on data abort
-
-Unfortunately, I cannot provide an image to reproduce this (the software is not open-source). But, I would be happy to help test a patch.