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tcg: enable MTTCG by default for ARM on x86 hosts

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This enables the multi-threaded system emulation by default for ARMv7
and ARMv8 guests using the x86_64 TCG backend. This is because on the
guest side:

  - The ARM translate.c/translate-64.c have been converted to
    - use MTTCG safe atomic primitives
    - emit the appropriate barrier ops
  - The ARM machine has been updated to
    - hold the BQL when modifying shared cross-vCPU state
    - defer powerctl changes to async safe work

All the host backends support the barrier and atomic primitives but
need to provide same-or-better support for normal load/store
operations.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Pranith Kumar <bobby.prani@gmail.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
This commit is contained in:
Alex Bennée 2017-02-23 18:29:27 +00:00
parent 4881658a4b
commit ca759f9e38
3 changed files with 20 additions and 0 deletions
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3
target/arm/cpu.h
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@ -30,6 +30,9 @@
# define TARGET_LONG_BITS 32
#endif
/* ARM processors have a weak memory model */
#define TCG_GUEST_DEFAULT_MO (0)
#define CPUArchState struct CPUARMState
#include "qemu-common.h"