[test do not merge] snapshot golden tests#1446
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A guest exception handler runs on the IST1 stack. If the handler writes a copy-on-write page, the first write faults. The page fault also uses IST1, so the CPU resets RSP to the top of IST1 and writes the fault frame over the live handler frame. The handler returns to a bad address and the guest aborts. The test exception handler increments a counter that starts on a copy-on-write page. Write the counter once in install_handler so its page copies into scratch before the handler runs. The handler then increments a writable page and does not fault. Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>
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Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>
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