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Currently one-insn TBs created from I/O memory are not added to region_trees. Therefore, when they generate exceptions, they are not handled by cpu_restore_state_from_tb(). For x86 this is not a problem, because x86_restore_state_to_opc() only restores pc and cc, which already have the correct values if the first TB instruction causes an exception. However, on several other architectures, restore_state_to_opc() is not stricly limited to state restoration and affects some exception-related registers, where guests can notice incorrect values, for example: - arm's exception.syndrome; - hppa's unwind_breg; - riscv's excp_uw2; - s390x's int_pgm_ilen. Fix by always calling tcg_tb_insert(). This may increase the size of region_trees, but tcg_region_reset_all() clears it once code_gen_buffer fills up, so it will not grow uncontrollably. Do not call tb_link_page(), which would add such TBs to the QHT, to prevent tb_lookup() from finding them. These TBs are single-use, since subsequent reads from I/O memory may return different values; they are not removed from code_gen_buffer only in order to keep things simple. Co-developed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20250116213214.5695-2-iii@linux.ibm.com> |
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| hvf | ||
| kvm | ||
| qtest | ||
| stubs | ||
| tcg | ||
| xen | ||
| accel-blocker.c | ||
| accel-system.c | ||
| accel-system.h | ||
| accel-target.c | ||
| accel-user.c | ||
| dummy-cpus.c | ||
| Kconfig | ||
| meson.build | ||