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exec: drop cpu_can_do_io, just read cpu->can_do_io

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After commit 626cf8f (icount: set can_do_io outside TB execution,
2014-12-08), can_do_io is set to 1 if not executing code.  It is
no longer necessary to make this assumption in cpu_can_do_io.

It is also possible to remove the use_icount test, simply by
never setting cpu->can_do_io to 0 unless use_icount is true.

With these changes cpu_can_do_io boils down to a read of
cpu->can_do_io.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-06-24 14:16:26 +02:00
parent b4a4b8d0e0
commit 414b15c909
7 changed files with 10 additions and 28 deletions
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4
include/qom/cpu.h
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@ -231,7 +231,9 @@ struct kvm_run;
* @icount_decr: Number of cycles left, with interrupt flag in high bit.
* This allows a single read-compare-cbranch-write sequence to test
* for both decrementer underflow and exceptions.
* @can_do_io: Nonzero if memory-mapped IO is safe.
* @can_do_io: Nonzero if memory-mapped IO is safe. Deterministic execution
* requires that IO only be performed on the last instruction of a TB
* so that interrupts take effect immediately.
* @env_ptr: Pointer to subclass-specific CPUArchState field.
* @current_tb: Currently executing TB.
* @gdb_regs: Additional GDB registers.