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From: | Richard Henderson |
Subject: | Re: [Qemu-devel] [PATCH] target/aarch64: exit to main loop after handling MSR |
Date: | Tue, 13 Jun 2017 21:48:17 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 |
On 06/13/2017 03:53 PM, Emilio G. Cota wrote:
The appended fixes it for me. Can you please test? [ apply with `git am --scissors' ] Thanks, Emilio ---- 8< ---- Commit e75449a3 ("target/aarch64: optimize indirect branches") causes a regression by which aarch64 guests freeze under TCG with -smp > 1, even with `-accel accel=tcg,thread=single' (i.e. MTTCG disabled). I isolated the problem to the MSR handler. This patch forces an exit after the handler is executed, which fixes the regression.
Why would that be? The cpu_get_tb_cpu_state within helper_lookup_tb_ptr is supposed to read the new state that the msr handler would have installed.
r~
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